Hello!
I want to describe my problem. I write code that switches screen into fullscreen mode and one can draw rectangles by mouse. Firstly i have initialisation:

If i comment Init_OpenGL call here but use the same call in WndProc on event WM_CREATE then I have no initialisation and no draw. If i copy code from Init_OpenGL to handler of WM_CREATE(it is commented) it works, but call Init_OpenGL not works. I cannot understand such behavior.
Thank you for explanation.

Please clarify, does the attached file work without modification?

Because I launched the program and it works - i can draw those rectangles.

Win7 x64

Ok, I can post not working program.
Here:

I comment Init_OpenGL
And here:

I use it. But in this case it not works.
If i uncomment a code upper in handler WM_CREATE, program works.

Sorry, forget post

The problem was, that you used global [hwnd] in InitOpen_GL, but it gets initialized only after CreateWindow, but WM_CREATEWINDOW get processed during CreateWindow call. So when you call InitOpen_GL, the global [hwnd] variable is NULL.



I modified the InitOpen_GL, added [hwnd] parameter, so hwnd can be passed to it. Now it works.


The second variant: you can also initialize global [hwnd] from WM_CREATEWINDOW handler, but then you should rename it to [hWnd] for example, otherwise you won't be able to access it.