Dan Appleman's Visual Bas…s Guide to the Win32 API/Dan.Applmans.Visual.Basic.5.0.Programmers.Guide.To.The.Win32.API.1997.Ziff-Davis.Press.CD/VB5PG32.mdf/vbpg32/samples5/ch04/vb3ini.frm

Visual Basic Form | 1995-05-05 | 5.2 KB | 161 lines

VERSION 2.00
Begin Form frmVB3INI
   Caption         =   "VB3 Profile Example"
   ClientHeight    =   3600
   ClientLeft      =   1395
   ClientTop       =   1905
   ClientWidth     =   6600
   Height          =   4005
   Left            =   1335
   ScaleHeight     =   3600
   ScaleWidth      =   6600
   Top             =   1560
   Width           =   6720
   Begin CommandButton cmdDeleteKey
      Caption         =   "Delete Key"
      Height          =   495
      Left            =   4800
      TabIndex        =   8
      Top             =   1320
      Width           =   1575
   End
   Begin CommandButton cmdAdd
      Caption         =   "Edit Entry"
      Height          =   495
      Left            =   600
      TabIndex        =   7
      Top             =   2520
      Width           =   1215
   End
   Begin TextBox txtNewValue
      Height          =   285
      Left            =   2640
      TabIndex        =   6
      Top             =   2760
      Width           =   3735
   End
   Begin TextBox txtNewKey
      Height          =   285
      Left            =   2640
      TabIndex        =   5
      Top             =   2400
      Width           =   3735
   End
   Begin CommandButton cmdListKeys
      Caption         =   "List Keys"
      Height          =   495
      Left            =   4800
      TabIndex        =   2
      Top             =   600
      Width           =   1575
   End
   Begin ListBox lstKeys
      Height          =   1590
      Left            =   600
      TabIndex        =   0
      Top             =   600
      Width           =   3975
   End
   Begin Label Label3
      Alignment       =   1  'Right Justify
      Caption         =   "Value"
      Height          =   255
      Left            =   1920
      TabIndex        =   3
      Top             =   2760
      Width           =   615
   End
   Begin Label Label2
      Alignment       =   1  'Right Justify
      Caption         =   "Key"
      Height          =   255
      Left            =   1920
      TabIndex        =   4
      Top             =   2400
      Width           =   615
   End
   Begin Label Label1
      Caption         =   "Keys in [FirstSection]"
      Height          =   255
      Left            =   600
      TabIndex        =   1
      Top             =   240
      Width           =   2415
   End
Option Explicit
Dim FileName$
Const INIFILE = "private.ini"
' Add a new key and value into the INI file section
Private Sub cmdAdd_Click ()
    Dim success%
    If Len(txtNewKey.Text) = 0 Or Len(txtNewValue.Text) = 0 Then
        MsgBox "Key and value must both be specified"
        Exit Sub
    End If
    ' Write the new key
    success% = WritePrivateProfileStringByKeyName("FirstSection", txtNewKey.Text, txtNewValue.Text, FileName$)
    If success% = 0 Then
        Dim msg$
        msg$ = "Edit failed - this is typically caused by a write protected INI file"
        msg$ = msg$ & Chr$(10) & "Try copying the file and project to your hard disk."
        MsgBox msg$
        Exit Sub
    End If
    cmdListKeys_Click   ' Refresh the list box
End Sub
' Delete the selected key
Private Sub cmdDeleteKey_Click ()
    Dim success%
    If lstKeys.ListIndex < 1 Then
        MsgBox "No selected entries in the list box"
        Exit Sub
    End If
    ' Delete the selected key
    success% = WritePrivateProfileStringToDeleteKey("FirstSection", lstKeys.Text, 0, FileName$)
    If success% = 0 Then
        Dim msg$
        msg$ = "Delete failed - this is typically caused by a write protected INI file"
        msg$ = msg$ & Chr$(10) & "Try copying the file and project to your hard disk."
        MsgBox msg$
        Exit Sub
    End If
    cmdListKeys_Click   ' Refresh the list box
End Sub
' List all of the keys in a particular section
Private Sub cmdListKeys_Click ()
    Dim bytes%
    Dim KeyList$
    KeyList$ = String$(128, 0)
    lstKeys.Clear
    ' Retrieve the list of keys in the section
    bytes% = GetPrivateProfileStringKeys("FirstSection", 0, "", KeyList$, 127, FileName$)
    ' Load sections into the list box
    Dim NullOffset%
    Do
        NullOffset% = InStr(KeyList$, Chr$(0))
        If NullOffset% > 1 Then
            lstKeys.AddItem Mid$(KeyList$, 1, NullOffset% - 1)
            KeyList$ = Mid$(KeyList$, NullOffset% + 1)
        End If
    Loop While NullOffset% > 1
End Sub
' This sample expects to see the INI file in the application
' directory. At design time, the current directory is VB, so
' we add the app.path to make sure we choose the right place.
' The \ handling deals with the unlikely event that the INI file
' is in the root directory.
Private Sub Form_Load ()
    FileName$ = app.Path
    If Right$(FileName$, 1) <> "\" Then FileName$ = FileName$ & "\"
    FileName$ = FileName$ & INIFILE
End Sub
Private Sub lstKeys_Click ()
    Dim bytes%
    Dim KeyValue$
    KeyValue$ = String$(128, 0)
    ' Retrieve the list of keys in the section
    KeyValue$ = VBGetPrivateProfileString("FirstSection", lstKeys.Text, FileName$)
    txtNewKey.Text = lstKeys.Text
    txtNewValue.Text = KeyValue$
End Sub