My program wont compile!! Help me plz... my source code: #include <windows.h> #include <stdlib.h> #define NULL //what do i put here? LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam); int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hprev, PSTR cmdline, int ishow) { HWND hwnd; MSG msg; WNDCLASSEX wndclassex = {0}; char class_name[] = "My Game"; wndclassex.cbSize = sizeof(WNDCLASSEX); wndclassex.style = CS_HREDRAW | CS_VREDRAW; wndclassex.lpfnWndProc = WinProc; wndclassex.hInstance = hinstance; wndclassex.hIcon = LoadIcon(hinstance,IDI_APPLICATION); wndclassex.hbrBackground = (HBRUSH)(BLACK_BRUSH); wndclassex.lpszClassName = class_name; RegisterClassEx(&wndclassex); hwnd = CreateWindowEx(NULL, class_name, "My Game", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hinstance, NULL); if(!hwnd) { UnregisterClass(class_name,hinstance); return EXIT_FAILURE; } ShowWindow(hwnd, ishow); UpdateWindow(hwnd); HBITMAP hbitmap = (HBITMAP)LoadImage(hinstance,"ent.bmp",IMAGE_BITMAP,0,0,LR_LOADFROMFILE); HDC hdc = GetDC(hwnd); HDC image_dc = CreateCompatibleDC(hdc); HBITMAP old_hbitmap = (HBITMAP)(image_dc,hbitmap); BitBlt(hdc,50,50,320,192,image_dc,0,0,SRCCOPY); while(1) { if(PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { if(msg.message == WM_QUIT) break; TranslateMessage(&msg); DispatchMessage(&msg); } else { } } SelectObject(image_dc,old_hbitmap); DeleteObject(hbitmap); ReleaseDC(hwnd, hdc); DeleteDC(image_dc); UnregisterClass(class_name,hinstance); return msg.wParam; } LRESULT CALLBACK WinProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) { PAINTSTRUCT ps; switch(message) { case WM_PAINT: BeginPaint(hwnd, &ps); EndPaint(hwnd, &ps); return 0; case WM_CLOSE: case WM_DESTROY: PostQuitMessage(0); return 0; } return(DefWindowProc(hwnd, message, wparam, lparam)); } when i try to compile it i get errors... 40 c:\windows\desktop\aotnsite\win_main.cpp warning: converting NULL to non-pointer type ....... 45 c:\windows\desktop\aotnsite\win_main.cpp `EXIT_FAILURE' undeclared (first use this function) ....... 45 c:\windows\desktop\aotnsite\win_main.cpp (Each undeclared identifier is reported only once ....... 45 c:\windows\desktop\aotnsite\win_main.cpp for each function it appears in.) those lines have: 40: NULL); 45:return EXIT_FAILURE; ........................... why wont it compile? ............................... There is no spoon [edited by - TheNerd Tk421 on August 8, 2003 11:12:39 AM] [edited by - TheNerd Tk421 on August 8, 2003 11:22:32 AM]

You never declared "EXIT_FAILURE" anywhere, and you''re trying to use it.

How appropriate. You fight like a cow.

lol... i guess i was paying attention to what i was doing...i feel so stupid..

It still wont compile cuz of NULL

[edited by - TheNerd Tk421 on August 8, 2003 11:07:24 AM]

The EXIT_FAILURE macro is defined in stdlib.h (or cstdlib, if you''re using C++). For some reason a lot of older C code--especially Windows programs--uses NULL for an integer 0, when NULL is supposed to represent an invalid pointer.

and if you do not need any headers that define NULL for you just do #include <stddef.h>, it contains NULL (defined there as 0), and a bit of some other stuff, but nothing big.