PC MAPI: C Equivalent to MAPI APPEXEC.TXT in MS Visual Basic

MORE INFORMATION

1. Obtain the hexadecimal memory handle from the command line of your application.
2. Convert the hexadecimal handle into an integer.
3. Call the Windows API GlobalRealloc() function to copy the PARAMBLK structure into your application's memory.
4. Call the APPEXEC API ReleaseSemaphore() function to tell APPEXEC you have copied the PARAMBLK structure.
5. Call the APPEXEC API CrackParameterBlock() and GetMessageID() functions to obtain the wCommand and MessageID information from the PARAMBLK structure.

Sample Code Fragment

#include <windows.h>
#include <stdlib.h>
#include <appexec.h>

int PASCAL WinMain( HINSTANCE hinstCurrent, HINSTANCE hinstPrevious,
LPSTR lpCmdLine, int nCmdShow )
{
char    szBuf[ 128 ];
char    szHandle[ 128 ];
DWORD   dw;
BOOL    fVal;
HGLOBAL ghParamBlk;


// procedure to pull messageID

if( *lpCmdLine ) {

 wsprintf( szHandle, "0x%s", lpCmdLine );

 ghParamBlk = (HGLOBAL)strtol( szHandle, '\0', 16 );

 ghParamBlk = GlobalReAlloc( ghParamBlk, 0, GMEM_MODIFY |GMEM_MOVEABLE
      | GMEM_SHARE );

 ReleaseSemaphore();

 fVal = CrackParameterBlock( ghParamBlk, CPB_wCommand, &dw, szBuf );
 if( fVal == 0 )
   goto ErrorStarting;

 fVal = CrackParameterBlock( ghParamBlk, CPB_wMessageIDCount, &dw,
 szBuf);
 if( fVal == 0 || dw != 1 )
   goto ErrorStarting;

 fVal = GetMessageID( ghParamBlk, 0, szBuf );
 if( fVal == 0 )
    goto ErrorStarting;
                  }

else
 goto ErrorStarting;

MessageBox( 0, szBuf, "Message ID", MB_OK );
return 0;

ErrorStarting:
 MessageBox( 0, "Unable to get Message ID", "Error", MB_OK );
 return 1;
}