Delphi 2 - Developers' Solutions/Delphi 2 Developers' Solutions.iso/dds/chap11/howto03/delphi10/cciccpop.pas

Pascal/Delphi Source File | 1996-06-12 | 40.6 KB | 1,139 lines

unit Cciccpop;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, ExtCtrls, StdCtrls, Buttons, Menus, FileCtrl, CCWSock, CCICCInf,
  CCICCPrf, IniFiles, Gauges , CCUUCode, CCiccfrm;

type
  { Component To Hold POP3/SMTP handling capabilities }
  TPOP3SMTPComponent = class( TWinControl )
  public
    POP3CommandInProgress ,
    Connection_Established : Boolean;
    Socket1 : TCCSocket;
    constructor Create( AOwner : TComponent ); override;
    destructor Destroy; override;
    function EstablishPOP3Connection( PCRPointer : PConnectionsRecord ) : Boolean;
    function POP3Disconnect : Boolean;
    function DoCStyleFormat(       TheText      : string;
                             const TheArguments : array of const ) : String;
    procedure UpdateGauge( BytesFinished , TotalToHandle : longint );
    procedure AddProgressText( WhatText : String );
    procedure ShowProgressText( WhatText : String );
    procedure ShowProgressErrorText( WhatText : String );
    function GetPOP3ServerResponse( var ResponseString : String ) : integer;
    procedure POP3SMTPSocketsErrorOccurred( Sender     : TObject;
                                     ErrorCode  : Integer;
                                     TheMessage : String   );
    function PerformPOP3Command(
                    TheCommand   : string;
              const TheArguments : array of const ) : Integer;
    function PerformPOP3ExtendedCommand(
                    TheCommand   : string;
              const TheArguments : array of const ) : Integer;
    function GetPOP3ServerExtendedResponse( ResponseString : PChar ) : integer;
    function GetNextSDItem(     WorkingString : String;
                            var TheIndex      : Integer ) : String;
    procedure PurgeTrashedMessageListings( TheEMBRecord : PEMailMailBoxRecord );
    procedure TrashMessage( TheEMMRecord : PEMailMessageRecord );
    procedure TrashAllMarkedMessages( TheLB       : TListBox;
                                      TheMBRecord : PEMailMailboxRecord );
    procedure ParseMailListing(     TheListing : String;
                                var TotalMessages : Longint;
                                var MessageBytes : Longint);
    function CheckAllNewMail( var TotalBytes : Longint ) : Integer;
    function GetMessageHeader( TheReturnList : TStringList ) : Longint;
    function DownloadMessageListing( TheNumber   : Integer;
                                     TheFileName : String;
                                     TheHeaderSL : TStringList ) : Longint;
    function DownloadAllMessageListings( TheEMBRecord : PEMailMailBoxRecord ) : Boolean;
    function GetHeaderSubject( HList : TStringList ) : String;
    function GetHeaderSender( HList : TStringList ) : String;
    function GetHeaderRecipient( HList : TStringList ) : String;
    function GetHeaderCarbons( HList : TStringList ) : String;
    function GetHeaderBlindCarbons( HList : TStringList ) : String;
    function GetHeaderDateTime( HList : TStringList ) : String;
    procedure TransferMessage( SourceEMBRecord , TargetEMBRecord : PEMailMailBoxRecord;
                              MessageNumber : Integer );
    function LoginUser( PCRPointer : PConnectionsRecord ) : Boolean;
    function SendPassword( PCRPointer : PConnectionsRecord ) : Boolean;
    function DeleteMailItem( TheNumber : Longint ) : Boolean;
  end;

var
  ThePOP3SMTPComponent  : TPOP3SMTPComponent; { Gee, which one is this? :) }

implementation

procedure TPOP3SMTPComponent.TrashMessage( TheEMMRecord : PEMailMessageRecord );
begin
  TheEMMRecord^.MRMessageSender := 'DELETE ME';
end;

procedure TPOP3SMTPComponent.TrashAllMarkedMessages( TheLB       : TListBox;
                                                     TheMBRecord : PEMailMailboxRecord );
var Counter_1 : Integer;
    WorkingList : TList;
begin
  WorkingList := TList( TheMBRecord^.MBLTag );
  for Counter_1 := 0 to TheLB.Items.Count - 1 do
  begin
    if TheLB.Selected[ Counter_1 ] then
    begin
      TrashMessage( PEMailMessageRecord( WorkingList.Items[ Counter_1 ] ));
    end;
  end;
end;

{ This function calls an extended response POP3SMTP command routine }
function TPOP3SMTPComponent.PerformPOP3ExtendedCommand(
               TheCommand   : string;
         const TheArguments : array of const ) : Integer;
var TheBuffer : string; { Text buffer }
begin
  { If command in progress send back -1 error }
  if POP3CommandInProgress then
  begin
    Result := -1;
    exit;
  end;
  { Set status variable }
  POP3CommandInProgress := True;
  { Set global error code }
  GlobalErrorCode := 0;
  { Format output string }
  TheBuffer := Format( TheCommand , TheArguments );
  { Preset failure code }
  Result := TCPIP_STATUS_FATAL_ERROR;
  { If invalid socket or no connection abort }
  if ( Socket1.TheSocket = INVALID_SOCKET ) or not Connection_Established then
   exit;
  { Send the buffer plus EOL chars }
  Socket1.StringData := TheBuffer + #13#10;
  { if abort due to timeout or other error exit }
  if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
  { Otherwise return preliminary code }
  Result := TCPIP_STATUS_PRELIMINARY;
end;

{ This function gets an extended period-ended multiline response from the server }
function TPOP3SMTPComponent.GetPOP3ServerExtendedResponse( ResponseString : PChar ) : integer;
var
  { Assume ResponseString already allocated as 0..513 }
  { Pointer to the response string }
  TheBuffer ,
  BufferPointer : array[0..255] of char;
  HolderBuffer : array[0..513] of char;
  { Character to check for response code }
  ResponseChar   : char;
  { Pointers into returned string }
  TheIndex ,
  TheLength     : integer;
  { Control variable }
  LeftoversInPan ,
  Finished      : Boolean;
  BufferString : String;
begin
  { Preset fatal error }
  Result := TCPIP_STATUS_FATAL_ERROR;
  { Start loop control }
  LeftoversInPan := false;
  Finished := false;
  StrCopy( HolderBuffer , '' );
  repeat
    { Do a peek }
    BufferString := Socket1.PeekData;
    { If timeout or other error exit }
    if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
    { Find end of line character }
    TheIndex := Pos( #10 , BufferString );
    if TheIndex = 0 then
    begin
      TheIndex := Pos( #13 , BufferString );
      if TheIndex = 0 then
      begin
        TheIndex := Pos( #0 , BufferString );
        if TheIndex = 0 then
        begin
          TheIndex := Length( BufferString );
          LeftoversInPan := True;
          StrPCopy( TheBuffer , BufferString );
          StrCat( HolderBuffer , TheBuffer );
          LeftoversOnTable := false;
        end;
      end;
    end;
    { If an end of line then process the line }
    if TheIndex > 0 then
    begin
      { Get length of string }
      TheLength := TheIndex;
      { Receive actual data }
      Socket1.CCSockReceive( Socket1.TheSocket   ,
                             @BufferPointer[ 0 ] ,
                             TheLength              );
      { Abort if timeout or error }
      if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
      { Put in the length byte }
      BufferPointer[ TheLength ] := Chr( 0 );
      if LeftOversOnTable then
      begin
        LeftOversOnTable := false;
        StrCopy( ResponseString , HolderBuffer );
        StrCat( ResponseString , BufferPointer );
      end
      else
      begin
        if not LeftoversInPan then StrCopy( ResponseString , BufferPointer );
      end;
      if LeftoversInPan then
      begin
        LeftoversInPan := false;
        LeftoversOnTable := true;
      end
      else
      begin
        ResponseChar := ResponseString[ 0 ];
        if (( ResponseChar = '.' ) and ( StrLen( ResponseString ) <= 3 )) then
        begin
          ResponseString[ 0 ] := ' ';
          Finished := true;
          Result := TCPIP_STATUS_COMPLETED;
        end
        else
        begin
          if ResponseChar = '.' then ResponseString[ 0 ] := ' ';
          Finished := true;
          Result := TCPIP_STATUS_PRELIMINARY;
        end;
      end;
    end;
  until ( Finished and ( not LeftoversOnTable ));
  StrLCopy( ResponseString , ResponseString , StrLen( ResponseString ) - 2 );
end;


{ This function moves along a string from an index, getting the next }
{ string delimited item or last one on string.                       }
function TPOP3SMTPComponent.GetNextSDItem(     WorkingString : String;
                                       var TheIndex      : Integer ) : String;
var HoldingString : String;
begin
  HoldingString := Copy( WorkingString , TheIndex + 1 , 255 );
  TheIndex := Pos( ' ' , HoldingString );
  if TheIndex = 0 then
  begin
    Result := HoldingString;
  end
  else
  begin
    HoldingString := Copy( HoldingString , 1 , TheIndex - 1 );
    Result := HoldingString;
  end;
end;

{ This method assumes logged into server; gets data via STAT command }
{ returns total bytes in var'd param and total messages as result    }
function TPOP3SMTPComponent.CheckAllNewMail( var TotalBytes : Longint ) : Integer;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
    TheLResult      : Longint;
begin
  TheReturnString :=
   DoCStyleFormat( 'STAT' , [ nil ] );
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Begin login sequence with user name }
  TheResult := PerformPOP3Command( 'STAT', [ nil ] );
  if TheResult <> TCPIP_STATUS_PRELIMINARY then
  begin
    POP3CommandInProgress := false;
    Result := -1;
    exit;
  end;
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'Mail Not Available!' , [ nil ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := -1;
    { leave }
    exit;
  end;
  ParseMailListing( TheReturnString , TheLResult , TotalBytes );
  Result := TheLResult;
end;

function TPOP3SMTPComponent.DeleteMailItem( TheNumber : Longint ) : Boolean;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
begin
  TheReturnString :=
   DoCStyleFormat( 'DELE %d' , [ TheNumber ] );
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Begin login sequence with user name }
  TheResult := PerformPOP3Command( 'DELE %d', [ TheNumber ] );
  if TheResult <> TCPIP_STATUS_PRELIMINARY then
  begin
    POP3CommandInProgress := false;
    Result := false;
    exit;
  end;
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'Mail Not Available!' , [ nil ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := false;
    { leave }
    exit;
  end;
  Result := True;
end;

{ This method splits up a listing and pulls out its component data }
procedure TPOP3SMTPComponent.ParseMailListing(     TheListing : String;
                                               var TotalMessages : Longint;
                                               var MessageBytes : Longint);
var HoldingString ,
    HoldingString2 : String;
    WorkingIndex  : Integer;
begin
  WorkingIndex := Pos( ' ' , TheListing );
  HoldingString := Copy( TheListing , WorkingIndex + 1 , 255 );
  WorkingIndex := Pos(  ' ' , HoldingString );
  HoldingString2 := Copy( HoldingString , 1 , WorkingIndex - 1 );
  TotalMessages := StrToInt( HoldingString2 );
  HoldingString := Copy( HoldingString , WorkingIndex + 1 , 255 );
  WorkingIndex := Pos(  ' ' , HoldingString );
  if WorkingIndex = 0 then WorkingIndex := 256;
  HoldingString2 := Copy( HoldingString , 1 , WorkingIndex - 1 );
  MessageBytes := StrToInt( HoldingString2 );
end;

{ This method accumulates all the strings until '' as a messge header }
function TPOP3SMTPComponent.GetMessageHeader( TheReturnList : TStringList ) : Longint;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
    TheReturnPChar ,
    TheHoldingPChar : PChar;
    TotalGotten : Longint;
begin
  GetMem( TheReturnPChar , 514 );
  TheReturnList.Clear;
  TotalGotten := 0;
  repeat
    TheResult := GetPOP3ServerExtendedResponse( TheReturnPChar );
    if StrLen( TheReturnPChar ) < 3 then
    begin
     TheResult := TCPIP_STATUS_COMPLETED;
    end;
    TotalGotten := TotalGotten + StrLen( TheReturnPChar ) + 2;
    if StrLen( TheReturnPChar ) > 255 then
    begin
      Getmem( TheHoldingPChar , 255 );
      while StrLen( TheReturnPChar ) > 255 do
      begin
        StrCopy( TheHoldingPChar , '' );
        StrMove( TheHoldingPChar , TheReturnPChar , 255 );
        TheReturnPChar := TheReturnPChar + 256;
        TheReturnString := StrPas( TheHoldingPChar );
        TheReturnList.Add( TheReturnString );
      end;
      StrCopy( TheHoldingPChar , '' );
      StrMove( TheHoldingPChar , TheReturnPChar , StrLen( TheReturnPChar ));
      TheReturnString := StrPas( TheHoldingPChar );
      TheReturnString := '\' + TheReturnString;
      TheReturnList.Add( TheReturnString );
      FreeMem( TheHoldingPChar , 255 );
    end
    else
    begin
      TheReturnString := StrPas( TheReturnPChar );
      TheReturnList.Add( TheReturnString );
    end;
  until (( GlobalAbortedFlag ) or ( TheResult = TCPIP_STATUS_COMPLETED ));
  FreeMem( TheReturnPChar , 514 );
  Result := TotalGotten;
end;

{ This method parses a header stringlist and obtains the subject line }
function TPOP3SMTPComponent.GetHeaderSubject( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '[No Subject]';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'SUBJECT:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 9 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method parses a header stringlist and obtains the sender's ID }
function TPOP3SMTPComponent.GetHeaderSender( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'FROM:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 7 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method strips out the TO: field of a mail message header }
function TPOP3SMTPComponent.GetHeaderRecipient( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'TO:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 5 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method strips out the CC: field of a mail message header }
function TPOP3SMTPComponent.GetHeaderCarbons( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'CC:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 5 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method strips out the BCC: field of a mail message header }
function TPOP3SMTPComponent.GetHeaderBlindCarbons( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'BCC:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 6 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method strips out the DATE: field of a mail message header }
function TPOP3SMTPComponent.GetHeaderDateTime( HList : TStringList ) : String;
var Counter_1     : Integer;
    Finished      : Boolean;
    WorkingIndex  : Integer;
    WorkingString : String;
begin
  Counter_1 := 0;
  Finished := false;
  WorkingString := '';
  while (( not Finished ) and ( Counter_1 <= HList.Count - 1 )) do
  begin
    WorkingIndex := Pos( 'DATE:' , Uppercase( HList.Strings[ Counter_1 ] ));
    if WorkingIndex > 0 then
    begin
      WorkingString := Copy( HList.Strings[ Counter_1 ] , 7 , 255 );
      Finished := true;
    end
    else Inc( Counter_1 );
  end;
  Result := WorkingString;
end;

{ This method transfers a message from one mailbox to another }
procedure TPOP3SMTPComponent.TransferMessage( SourceEMBRecord ,
                                              TargetEMBRecord : PEMailMailBoxRecord;
                                              MessageNumber : Integer );
var  WorkingList1 , WorkingList2 : TList;
     TheEMMRecord : PEMailMessageRecord;
begin
  WorkingList1 := TList( SourceEMBRecord^.MBLTag );
  WorkingList2 := TList( TargetEMBRecord^.MBLTag );
  TheEMMRecord := PEMailMessageRecord( WorkingList1.Items[ MessageNumber ] );
  WorkingList2.Add( TheEMMRecord );
  SourceEMBRecord^.MBLTag := Longint( WorkingList1 );
  TargetEMBRecord^.MBLTag := Longint( WorkingList2 );
end;

{ This function deletes all read/sent articles and associated files }
procedure TPOP3SMTPComponent.PurgeTrashedMessageListings( TheEMBRecord : PEMailMailBoxRecord );
var TheEMMRecord   : PEMailMessageRecord;
    Counter_1      : Integer;
    WorkingList    : TList;
    Finished       : Boolean;
begin
  { Do this for ease of coding }
  with TheEMBRecord^ do
  begin
    { Get the current TList of article headers }
    WorkingList := TList( MBLTag );
    { Run up to total new articles }
    for Counter_1 := 0 to WorkingList.Count - 1 do
    begin
      TheEMMRecord := PEMailMessageRecord( WorkingList.Items[ Counter_1 ] );
      if ( TheEMMRecord^.MRMessageSender = 'DELETE ME' ) then
      begin
        Dec( MBTotal );
        if not TheEMMRecord^.MRRead then if MBUnReadTotal > 0 then Dec( MBUnReadTotal );
        if not TheEMMRecord^.MRSent then if MBUnSentTotal > 0 then Dec( MBUnSentTotal );
        if FileExists( MailPath + '\' + TheEMMRecord^.MRFilename ) then
         {DeleteFile( MailPath + '\' + TheEMMRecord^.MRFileName )};
      end;
    end;
    Counter_1 := 0;
    Finished := False;
    if WorkingList.Count = 0 then Finished := true;
    while Not Finished do
    begin
      TheEMMRecord := PEMailMessageRecord( WorkingList.Items[ Counter_1 ] );
      if ( TheEMMRecord^.MRMessageSender = 'DELETE ME' ) then
      begin
        WorkingList.Delete( Counter_1 );
      end
      else Counter_1 := Counter_1 + 1;
      if Counter_1 > WorkingList.Count - 1 then Finished := true;
    end;
  end;
end;

{ This method uses the ARTICLE command to obtain an article and put it in a  }
{ preset/supplied file. It is designed to work by itself or inside DAALs     }
function TPOP3SMTPComponent.DownloadMessageListing( TheNumber   : Integer;
                                                    TheFileName : String;
                                                    TheHeaderSL : TStringList   ) : Longint;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
    TheReturnPChar ,
    TheHoldingPChar : PChar;
    TheMessageFile       : TextFile;
    Counter_1   : Integer;
    TotalGotten : Longint;
begin
  TheReturnString :=
   DoCStyleFormat( 'RETR %d' ,
    [ TheNumber ] );
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Begin login sequence with user name }
  TheResult := PerformPOP3Command( 'RETR %d', [ TheNumber ] );
  if TheResult <> TCPIP_STATUS_PRELIMINARY then
  begin
    POP3CommandInProgress := false;
    Result := 0;
    exit;
  end;
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'Retrieve Message %d Failed!' ,
      [ TheNumber ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := 0;
    { leave }
    exit;
  end;
  GetMem( TheReturnPChar , 514 );
  try
    AssignFile( TheMessageFile , TheFileName );
    Rewrite( TheMessageFile );
  except
    MessageDlg( 'Unable to open Mail Message file ' + TheFileName + '!' ,
     mtError , [mbok],0 );
    Socket1.OutOfBand := 'ABOR'+#13#10;
    repeat
      TheResult := GetPOP3ServerResponse( TheReturnString );
      { Put result in progress and status line }
      AddProgressText( TheReturnString );
      ShowProgressText( TheReturnString  + #13#10 );
    until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
    result := 0;
    exit;
  end;
  TotalGotten := GetMessageHeader( TheHeaderSL );
  for Counter_1 := 0 to TheHeaderSL.Count - 1 do
   Writeln( TheMessageFile , TheHeaderSL.Strings[ Counter_1 ] );
  repeat
    TheResult := GetPOP3ServerExtendedResponse( TheReturnPChar );
    TotalGotten := TotalGotten + StrLen( TheReturnPChar ) + 2;
    if StrLen( TheReturnPChar ) > 255 then
    begin
      Getmem( TheHoldingPChar , 255 );
      while StrLen( TheReturnPChar ) > 255 do
      begin
        StrCopy( TheHoldingPChar , '' );
        StrMove( TheHoldingPChar , TheReturnPChar , 255 );
        TheReturnPChar := TheReturnPChar + 256;
        TheReturnString := StrPas( TheHoldingPChar );
        Writeln( TheMessageFile , TheReturnString );
      end;
      StrCopy( TheHoldingPChar , '' );
      StrMove( TheHoldingPChar , TheReturnPChar , StrLen( TheReturnPChar ));
      TheReturnString := StrPas( TheHoldingPChar );
      TheReturnString := '\' + TheReturnString;
      Writeln( TheMessageFile , TheReturnString );
      FreeMem( TheHoldingPChar , 255 );
    end
    else
    begin
      TheReturnString := StrPas( TheReturnPChar );
      Writeln( TheMessageFile , TheReturnString );
    end;
  until (( GlobalAbortedFlag ) or ( TheResult = TCPIP_STATUS_COMPLETED ));
  FreeMem( TheReturnPChar , 514 );
  CloseFile( TheMessageFile );
  Result := TotalGotten;
end;

{ This method Gets all the Article Listings for a newsgroup which have not been  }
{ Downloaded and gets them into text files. It displays Article count, # & bytes }
{ in the status line during the process.                                         }
function TPOP3SMTPComponent.DownloadAllMessageListings(
  TheEMBRecord : PEMailMailBoxRecord ) : Boolean;
var WorkingList   : TList;
    TheEMMRecord  : PEMailMessageRecord;
    Counter_1 : Integer;
    WorkingID ,
    WorkingNumber : Integer;
    WorkingFileName : String;
    BytesToGet : Longint;
    TotalMessages : Integer;
    WorkingSL : TStringList;
    BytesGotten : Longint;
begin
  Result := true;
  TotalMessages := CheckAllNewMail( BytesToGet );
  if TotalMessages < 0 then exit;
  if TotalMessages = 0 then
  begin
    MessageDlg( 'No New Mail!' , mtInformation, [mbOK],0);
    exit;
  end;
  with TheEMBRecord^ do
  begin
    WorkingID := MBIDNumber;
    WorkingNumber := MBMaxMsgNumber;
    WorkingList := TList( MBLTag );
    WorkingSL := TStringList.Create;
    for Counter_1 := 1 to TotalMessages do
    begin
      New( TheEMMRecord );
      WorkingNumber := WorkingNumber + 1;
      with TheEMMRecord^ do
      begin
        WorkingFileName := 'EM' + IntToStr( WorkingNumber );
        if Length( WorkingFileName ) > 8 then WorkingFileName :=
         Copy( WorkingFileName , 1 , 8 );
        WorkingFileName := WorkingFileName + '.' +
         IntToStr( WorkingID );
        MRFileName := WorkingFileName;
        WorkingFileName := MailPath + '\' + WorkingFileName;
        BytesGotten := DownloadMessageListing( Counter_1 , WorkingFileName , WorkingSL );
        if EMRemoteDeletionVector = 2 then DeleteMailItem( Counter_1 );
        UpdateGauge( BytesGotten , BytesToGet );
        MRMailBoxName      := MBName;
        MRMessageSubject   := GetHeaderSubject( WorkingSL );
        MRMessageRecipient := GetHeaderRecipient( WorkingSL );
        MRMessageSender    := GetHeaderSender( WorkingSL );
        MRCarbonCopy       := GetHeaderCarbons( WorkingSL );
        MRBlindCarbonCopy  := GetHeaderBlindCarbons( WorkingSL );
        MRDateTime         := GetHeaderDateTime( WorkingSL );
        MRRead             := false;
        MRSent             := false;
        MRFileName         := ExtractFileName( WorkingFileName );
        WorkingList.Add( TheEMMRecord );
      end;
    end;
    UpdateGauge( BytesToGet , BytesToGet );
    MBLTag := Longint( WorkingList );
    MBMaxMsgNumber := WorkingNumber;
    MBTotal       := MBTotal + TotalMessages;
    MBUnReadTotal := MBUnReadTotal + TotalMessages;
    Result := true;
  end;
end;

{ This sends FTP progress text to the Inet form }
procedure TPOP3SMTPComponent.ShowProgressErrorText( WhatText : String );
begin
 CCInetCCForm.ShowProgressErrorText( WhatText );
end;

{ This is a core function! It performs an FTP command and if no timeout }
{ return a preliminary ok.                                              }
function TPOP3SMTPComponent.PerformPOP3Command(
                 TheCommand        : string;
           const TheArguments      : array of const ) : Integer;
var TheBuffer : string; { Text buffer }
begin
  { If command in progress send back -1 error }
  if POP3CommandInProgress then
  begin
    Result := -1;
    exit;
  end;
  { Set status variable }
  POP3CommandInProgress := True;
  { Set global error code }
  GlobalErrorCode := 0;
  { Format output string }
  TheBuffer := Format( TheCommand , TheArguments );
  { Preset failure code }
  Result := TCPIP_STATUS_FATAL_ERROR;
  { If invalid socket or no connection abort }
  if ( Socket1.TheSocket = INVALID_SOCKET ) or not Connection_Established then
   exit;
  { Send the buffer plus EOL chars }
  Socket1.StringData := TheBuffer + #13#10;
  { if abort due to timeout or other error exit }
  if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
  { Otherwise return preliminary code }
  Result := TCPIP_STATUS_PRELIMINARY;
end;

{ This function gets up to 255 chars of data plus a return code from FTP serv }
function TPOP3SMTPComponent.GetPOP3ServerResponse(
          var ResponseString : String ) : integer;
var
  { Buffer string for response line }
  TheBuffer     : string;
  { Pointer to the response string }
  BufferPointer : array[0..255] of char absolute TheBuffer;
  { Character to check for response code }
  ResponseChar   : char;
  { Pointers into returned string }
  TheIndex ,
  TheLength     : integer;
  { Control variable }
  LeftoversInPan ,
  Finished      : Boolean;
begin
  { Preset fatal error }
  Result := TCPIP_STATUS_FATAL_ERROR;
  { Start loop control }
  LeftoversInPan := false;
  Finished := false;
  repeat
    { Do a peek }
    TheBuffer := Socket1.PeekData;
    { If timeout or other error exit }
    if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
    { Find end of line character }
    TheIndex := Pos( #10 , TheBuffer );
    if TheIndex = 0 then
    begin
      TheIndex := Pos( #13 , TheBuffer );
      if TheIndex = 0 then
      begin
        TheIndex := Pos( #0 , TheBuffer );
        if TheIndex = 0 then
        begin
          TheIndex := Length( TheBuffer );
          LeftoversInPan := True;
          LeftoverText := LeftoverText + TheBuffer;
          LeftoversOnTable := false;
        end;
      end;
    end;
    { If an end of line then process the line }
    if TheIndex > 0 then
    begin
      { Get length of string }
      TheLength := TheIndex;
      { Receive actual data }
      Socket1.CCSockReceive( Socket1.TheSocket   ,
                             @BufferPointer[ 1 ] ,
                             TheLength              );
      { Abort if timeout or error }
      if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 )) then exit;
      { Put in the length byte }
      BufferPointer[ 0 ] := Chr( TheLength );
      if LeftOversOnTable then
      begin
        LeftOversOnTable := false;
        ResponseString := LeftoverText + TheBuffer;
        TheBuffer := ResponseString;
        LeftoverText := '';
      end;
      if LeftoversInPan then
      begin
        LeftoversInPan := false;
        LeftoversOnTable := true;
      end;
      { Get first number character }
      ResponseChar := TheBuffer[ 1 ];
      { Get the value of the number from 1 to 5 }
      if (( ResponseChar = '+' ) or ( ResponseChar = '-' )) then
      begin
        Finished := true;
        if ResponseChar = '+' then Result := TCPIP_STATUS_COMPLETED
         else Result := TCPIP_STATUS_FATAL_ERROR;
      end;
    end
    else
    begin
    end;
  until ( Finished and ( not LeftoversOnTable ));
  { Return buffer as response string }
  ResponseString := TheBuffer;
  ResponseString := Copy( ResponseString , 1, Length( ResponseString ) - 2 );
end;

{ Boilerplate error routine }
procedure TPOP3SMTPComponent.POP3SMTPSocketsErrorOccurred( Sender     : TObject;
                                                 ErrorCode  : Integer;
                                                 TheMessage : String   );
begin
  CCInetCCForm.SocketsErrorOccurred( Sender,ErrorCode,TheMessage );
end;

{ This is the POP3SMTP components POP3 initial connection routine }
function TPOP3SMTPComponent.EstablishPOP3Connection(
          PCRPointer : PConnectionsRecord ) : Boolean;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
begin
  { Set default FTP Port value }
  Socket1.PortName := '110';
  { Get the ip address from the record }
  Socket1.IPAddressName := PCRPointer^.CIPAddress;
  { Set blocking mode }
  Socket1.AsynchMode := False;
  { Clear condition variables }
  GlobalErrorCode := 0;
  GlobalAbortedFlag := false;
  { Actually attempt to connect }
  Socket1.CCSockConnect;
  { Check if connected }
  if (( GlobalAbortedFlag ) or ( GlobalErrorCode <> 0 ) or
      ( Socket1.TheSocket = INVALID_SOCKET )) then
  begin { Didn't connect; signal error and abort }
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'POP3 Host %s Connection Failed!' ,
      [ PCRPointer^.CIPAddress ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := False;
    { leave }
    exit;
  end
  else
  begin
    Connection_Established := true;
    { Signal successful connection }
    TheReturnString := DoCStyleFormat(
      'Connected on Local port: %s with IP: %s',
      [ Socket1.GetSocketPort( Socket1.TheSocket ),
        Socket1.GetSocketIPAddress( Socket1.TheSocket )]);
    { Put result in progress and status line }
    CCINetCCForm.AddProgressText( TheReturnString );
    CCINetCCForm.ShowProgressText( TheReturnString );
    TheReturnString := DoCStyleFormat(
     'Connected to Remote port: %s with IP: %s',
      [ Socket1.GetSocketPeerPort( Socket1.TheSocket ),
        Socket1.GetSocketPeerIPAddress( Socket1.TheSocket )]);
    { Put result in progress and status line }
    CCINetCCForm.AddProgressText( TheReturnString );
    CCINetCCForm.ShowProgressText( TheReturnString );
    TheReturnString := DoCStyleFormat( 'Successfully connected to %s',
     [ Socket1.IPAddressName ]);
    { Put result in progress and status line }
    CCINetCCForm.AddProgressText( TheReturnString );
    CCINetCCForm.ShowProgressText( TheReturnString );
    repeat
      TheResult := GetPOP3ServerResponse( TheReturnString );
      { Put result in progress and status line }
      AddProgressText( TheReturnString );
      ShowProgressText( TheReturnString );
    until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
    if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
    begin
      { Do clever C formatting trick }
      TheReturnString :=
       DoCStyleFormat( 'POP3 Host %s Connection Failed!' ,
        [ PCRPointer^.CIPAddress ] );
      { Put result in progress and status line }
      AddProgressText( TheReturnString );
      ShowProgressErrorText( TheReturnString );
      { Signal error }
      Result := False;
      { leave }
      exit;
    end
    else Result := true; { Signal no problem }
  end;
end;

{ This sends FTP progress text to the Inet form }
procedure TPOP3SMTPComponent.AddProgressText( WhatText : String );
begin
  CCInetCCForm.AddProgressText( WhatText );
end;

{ This sends FTP progress text to the Inet form }
procedure TPOP3SMTPComponent.ShowProgressText( WhatText : String );
begin
  CCInetCCForm.ShowProgressText( WhatText );
end;

{ This is a clever c-style formatting trick }
function TPOP3SMTPComponent.DoCStyleFormat(
                TheText      : string;
          const TheArguments : array of const ) : String;
begin
  Result := Format( TheText , TheArguments ) + #13#10;
end;

{ This is the FTP components USER login routine }
function TPOP3SMTPComponent.LoginUser(
          PCRPointer : PConnectionsRecord ) : Boolean;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
begin
  TheReturnString :=
   DoCStyleFormat( 'USER %s' ,
    [ PCRPointer^.CUserName ] );
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Begin login sequence with user name }
  TheResult := PerformPOP3Command( 'USER %s',
                                  [ PCRPointer^.CUserName ] );
  if TheResult <> TCPIP_STATUS_PRELIMINARY then
  begin
    POP3CommandInProgress := false;
    Result := false;
    exit;
  end;
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'POP3 Host %s Login Failed!' ,
      [ PCRPointer^.CIPAddress ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := False;
    { leave }
    exit;
  end
  else Result := true; { Signal no problem }
end;

{ This is the FTP components PASSWORD routine }
function TPOP3SMTPComponent.SendPassword(
          PCRPointer : PConnectionsRecord ) : Boolean;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
begin
  TheReturnString := 'PASS XXXXXX' + #13#10;
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Send Password sequence }
  TheResult := PerformPOP3Command( 'PASS %s',
                                  [ PCRPointer^.CPassword ] );
  if TheResult <> TCPIP_STATUS_PRELIMINARY then
  begin
    Result := false;
    POP3CommandInProgress := false;
    exit;
  end;
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'POP3 Host %s Login Failed!' ,
      [ PCRPointer^.CIPAddress ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := False;
    { leave }
    exit;
  end
  else Result := true; { Signal no problem }
end;

{ This is the FTP component constructor; it creates 2 sockets }
constructor TPOP3SMTPComponent.Create( AOwner : TComponent );
begin
  { do inherited create }
  inherited Create( AOwner );
  { Create sockets, put in their parents, and error procs }
  Socket1 := TCCSocket.Create( Self );
  Socket1.Parent := Self;
  Socket1.OnErrorOccurred := POP3SMTPSocketsErrorOccurred;
  { Set up booleans }
  Connection_Established := false;
  POP3CommandInProgress := false;
end;

{ This is the FTP component destructor; it frees 2 sockets }
destructor TPOP3SMTPComponent.Destroy;
begin
  { Free the sockets }
  Socket1.Free;
  { and call inherited }
  inherited Destroy;
end;

{ This is the POP3 components QUIT routine }
function TPOP3SMTPComponent.POP3Disconnect : Boolean;
var TheReturnString : String;  { Internal string holder }
    TheResult       : Integer; { Internal int holder    }
begin
  TheReturnString :=
   DoCStyleFormat( 'QUIT' ,
    [ nil ] );
  { Put result in progress and status line }
  AddProgressText( TheReturnString );
  ShowProgressText( TheReturnString );
  { Begin login sequence with user name }
  PerformPOP3Command( 'QUIT', [ nil ] );
  repeat
    TheResult := GetPOP3ServerResponse( TheReturnString );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressText( TheReturnString + #13#10 );
  until (( GlobalAbortedFlag ) or ( TheResult <> TCPIP_STATUS_PRELIMINARY ));
  POP3CommandInProgress := false;
  if ( GlobalAbortedFlag or ( TheResult <> TCPIP_STATUS_COMPLETED )) then
  begin
    { Do clever C formatting trick }
    TheReturnString :=
     DoCStyleFormat( 'EMail Host Connection Failed!' ,
      [ nil ] );
    { Put result in progress and status line }
    AddProgressText( TheReturnString );
    ShowProgressErrorText( TheReturnString );
    { Signal error }
    Result := False;
    { leave }
    exit;
  end
  else Result := true; { Signal no problem }
end;


procedure TPOP3SMTPComponent.UpdateGauge( BytesFinished , TotalToHandle : longint );
begin
  CCInetCCForm.UpdateMailGauge( BytesFinished , TotalToHandle );
end;

end.