CreateWindow never triggers WM_CREATE - windows-8

Question

I have the following bit of code;
#include <windows.h>
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){
printf("%d\n", message);
return 0;
}
int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow){
WNDCLASSEX wc = {0};
wc.cbSize = sizeof(WNDCLASSEX);
wc.lpfnWndProc = WndProc;
wc.hInstance = hInstance;
wc.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);
wc.lpszClassName = "oglversionchecksample";
wc.style = CS_OWNDC;
if(!RegisterClassEx(&wc))
return 1;
CreateWindow(wc.lpszClassName, "openglversioncheck", WS_OVERLAPPED, 0, 0, 640, 480, 0, 0, hInstance, 0);
return 0;
}
Calling CreateWindow() triggers message numbers 36 WM_GETMINMAXINFO, 129 WM_NCCREATE, and then 130 WM_NCDESTROY, but message number 1 WM_CREATE is never triggered like it's supposed to be.
What am I doing wrong that's causing WM_CREATE to not be triggered?

Answer 1

It doesn't trigger any message, because message loop is not called yet.
You have to put this after CreateWindow
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
Also, WndProc should not simply return zero. It should return the following:
return DefWindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
Visual Studio or other IDE's can create C++ -> Win32 project basic project, it sets up all the code.

Answer 2

The created window has no time to receive the messages, it is closed immediately. You should call GetMessage in loop to keep the window alive.
// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
See this example: http://www.winprog.org/tutorial/simple_window.html