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PC World Komputer 1998 May
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TSTAPP.PAK
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MSGPROC.C
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1995-08-29
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// Borland C++ - (C) Copyright 1991, 1992 by Borland International
//*******************************************************************
//
// program - MsgProc.c
// purpose - A windows program to send messages to MsgWnd application.
// This file is part of the TSTAPP project.
//
//*******************************************************************
#define STRICT
#include <windows.h>
#pragma hdrstop
#include <dde.h>
#include <string.h>
#include "msgproc.h"
#include "ddeclnt.h"
#if defined(__FLAT__)
#define _fstrcpy strcpy
#define _fstrcat strcat
#endif
static HWND hChannel;
static HWND hMsgWnd;
//*******************************************************************
// SendMsgWndMsg - send a message to the MsgWnd application
//
// paramaters:
// hWnd - The window handle of caller
// command - The command to send to msgwnd application
// msg - The message to send to msgwnd application
//
//*******************************************************************
void SendMsgWndMsg(HWND hWnd, char *command, char *msg)
{
HANDLE hmsg;
LPSTR lpmsg;
// If the msgwnd application is running and we have a conversation
// channel established with it, lets send our text message to it.
if (GetMsgLink(hWnd))
{
// Allocate some shared memory to put message into.
hmsg = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE,
(DWORD) (strlen(command) + (msg ? strlen(msg) : 0) + 8));
if (hmsg)
{
// Lock it down to get addres of memory.
lpmsg = GlobalLock(hmsg);
if (lpmsg)
{
// Build print command to send to msgwnd application.
_fstrcpy(lpmsg, "[");
_fstrcat(lpmsg, command);
if (msg)
{
_fstrcat(lpmsg, " (\"");
_fstrcat(lpmsg, msg);
_fstrcat(lpmsg, "\")");
}
_fstrcat(lpmsg, "]");
// Send the command.
DDEExecute(hChannel, lpmsg, 0);
GlobalUnlock(hmsg);
}
GlobalFree(hmsg);
}
}
}
//*******************************************************************
// GetLines - get number of lines printed by msgwnd
//
// paramaters:
// hWnd - The window handle of caller
//
// returns:
// handle to 'lines' data item.
// or
// NULL if it was not returned.
//
//*******************************************************************
HANDLE GetLines(HWND hWnd)
{
HANDLE hTmp;
hTmp = 0;
// If the msgwnd application is running and we have a conversation
// channel established with it, lets send our text message to it.
if (GetMsgLink(hWnd))
{
// Go ask for the 'lines' data item from msgwnd application.
hTmp = DDERead(hChannel, "lines", 5);
}
// Return handle to 'lines' data item or NULL if it was not returned.
return(hTmp);
}
//*******************************************************************
// CloseMsgWnd - close dde message link to the MsgWnd application
//
//*******************************************************************
void CloseMsgWnd()
{
// Tell msgwnd application we want to terminate our conversation.
DDEClientClose(hChannel);
hChannel = 0;
}
//*******************************************************************
// GetMsgLink - establish link to msgwnd application
//
//*******************************************************************
int GetMsgLink(HWND hWnd)
{
char msgbuf[80];
// See if msgwnd application is already running.
hMsgWnd = FindWindow("msgwnd", NULL);
if (!hMsgWnd)
{
// If not, try to activate it.
strcpy(msgbuf, "MSGWND.EXE");
WinExec(msgbuf, SW_SHOWNORMAL);
hMsgWnd = FindWindow("msgwnd", NULL);
hChannel = 0;
}
// Have we started a conversation with the msgwnd application yet?
if (!hChannel)
{
// No, try to start one.
hChannel = DDEClientOpen(hWnd, "msgwnd", "screen");
}
return((int) hChannel);
}
//*******************************************************************