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Windows 95 API Bible
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Windows 95 API Bible 3 Disc Set.iso
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Win32 API Bible Book 1 of 3
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CHAPTE26
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EX3.C
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C/C++ Source or Header
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1995-06-03
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2KB
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55 lines
#include <genstub.c>
#define OUR_ERROR 0x10000000
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
static UINT uClicks;
static UINT uRow;
switch (uMsg)
{
case WM_CREATE:
uRow = 0;
uClicks = 0;
return DefWindowProc( hWnd, uMsg, wParam, lParam);
case WM_DESTROY:
PostQuitMessage( 0 );
break;
case WM_COMMAND:
switch ( LOWORD( wParam ) )
{
case IDM_TEST:
{
HANDLE hModule;
char szBuffer[128];
HDC hDC = GetDC(hWnd);
// Turn off the DLL not found error mode.
UINT uOldMode = SetErrorMode( SEM_NOOPENFILEERRORBOX );
if ( (hModule = LoadLibrary("EX4.DLL")) )
{
// Get address of external function.
FARPROC lpfnSetErrorCondition;
lpfnSetErrorCondition =
GetProcAddress(hModule, "SetTheErrorCondition");
// Call external function to change error code.
if (lpfnSetErrorCondition)
(*lpfnSetErrorCondition) (OUR_ERROR + uClicks++);
}
TextOut( hDC, 0, 16 * uRow++, szBuffer,
wsprintf(szBuffer,"Error code is: %X",
GetLastError() ));
SetErrorMode( uOldMode );
ReleaseDC(hWnd, hDC);
}
break;
case IDM_EXIT:
DestroyWindow( hWnd );
break;
}
break;
default:
return (DefWindowProc(hWnd, uMsg, wParam, lParam));
}
return (NULL);
}