I have never created an actual game loop using a window that I have created myself and implimenting messages and whatnot ... but what I thought would simply work doesnt work. Could someone help me out a bit? This is the main hassle bit:

	do
	{
	    while(GetMessage(&msg, hWnd, 0, 0)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
	    }
		XPos = 5.0;
		//Frame?
	} while (GameRuns == 1);

The XPos = 5.0 bit is never reached :-( Why is this? If you want a look at ALL of the code then here it is: glBegin(GL_TRIANGLES); // Drawing Using Triangles glColor3f(1.0f, 0.0f, 0.0f); glVertex3f( -9.5f + XPos, 1.0f, -2.0f); // Top glVertex3f(-10.0f + XPos,-1.0f, -2.0f); // Bottom Left glVertex3f( -9.0f + XPos,-1.0f, -2.0f); // Bottom Right glEnd(); // Finished Drawing The Triangle glFlush(); } LONG WINAPI WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { static PAINTSTRUCT ps; switch(uMsg) { case WM_PAINT: display(); BeginPaint(hWnd, &ps); EndPaint(hWnd, &ps); return 0; case WM_SIZE: /*FORM_WIDTH = LOWORD(lParam); FORM_HEIGHT = HIWORD(lParam);*/ glViewport(0, 0, LOWORD(lParam), HIWORD(lParam)); // PROJECTION TRANSFORMATION //glMatrixMode(GL_PROJECTION); //glLoadIdentity(); //glFrustum(10, 10, 10, 10, 1, 20); PostMessage(hWnd, WM_PAINT, 0, 0); return 0; case WM_CHAR: /* WHEN EXCAPE KEY IS PRESSED */ switch (wParam) { case 27: /* ESC key */ GameRuns = 0; PostQuitMessage(0); break; } return 0; case WM_CLOSE: /* WHEN THE WINDOW IS CLOSED BY PRESSING X BUTTON */ GameRuns = 0; PostQuitMessage(0); return 0; } return DefWindowProc(hWnd, uMsg, wParam, lParam); } HWND CreateOpenGLWindow(char* title, int x, int y, int width, int height, BYTE type, DWORD flags) { int pf; HDC hDC; HWND hWnd; WNDCLASS wc; PIXELFORMATDESCRIPTOR pfd; static HINSTANCE hInstance = 0; /* only register the window class once - use hInstance as a flag. */ if (!hInstance) { hInstance = GetModuleHandle(NULL); wc.style = CS_OWNDC; wc.lpfnWndProc = (WNDPROC)WindowProc; wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.hInstance = hInstance; wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hbrBackground = NULL; wc.lpszMenuName = NULL; wc.lpszClassName = "OpenGL"; if (!RegisterClass(&wc)) { MessageBox(NULL, "RegisterClass() failed: Cannot register window class.", "Error", MB_OK); return NULL; } } hWnd = CreateWindow("OpenGL", title, WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, x, y, width, height, NULL, NULL, hInstance, NULL); if (hWnd == NULL) { MessageBox(NULL, "CreateWindow() failed: Cannot create a window.", "Error", MB_OK); return NULL; } hDC = GetDC(hWnd); /* there is no guarantee that the contents of the stack that become the pfd are zeroed, therefore _make sure_ to clear these bits. */ memset(&pfd, 0, sizeof(pfd)); pfd.nSize = sizeof(pfd); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | flags; pfd.iPixelType = type; pfd.cColorBits = 32; pf = ChoosePixelFormat(hDC, &pfd); if (pf == 0) { MessageBox(NULL, "ChoosePixelFormat() failed: Cannot find a suitable pixel format.", "Error", MB_OK); return 0; } if (SetPixelFormat(hDC, pf, &pfd) == FALSE) { MessageBox(NULL, "SetPixelFormat() failed: Cannot set format specified.", "Error", MB_OK); return 0; } DescribePixelFormat(hDC, pf, sizeof(PIXELFORMATDESCRIPTOR), &pfd); ReleaseDC(hWnd, hDC); return hWnd; } int APIENTRY WinMain(HINSTANCE hCurrentInst, HINSTANCE hPreviousInst, LPSTR lpszCmdLine, int nCmdShow) { HDC hDC; /* device context */ HGLRC hRC; /* opengl context */ HWND hWnd; /* window */ MSG msg; /* message */ hWnd = CreateOpenGLWindow("XyuRi", 100, 100, 640, 480, PFD_TYPE_RGBA, 0); if (hWnd == NULL) {exit(1);} hDC = GetDC(hWnd); hRC = wglCreateContext(hDC); wglMakeCurrent(hDC, hRC); ShowWindow(hWnd, nCmdShow); /* ENABLE DEPTH BUFFERING! */ glEnable(GL_DEPTH_TEST); do { while(GetMessage(&msg, hWnd, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } XPos = 5.0; //Frame? } while (GameRuns == 1); wglMakeCurrent(NULL, NULL); ReleaseDC(hWnd, hDC); wglDeleteContext(hRC); DestroyWindow(hWnd); return msg.wParam; } Any help with this is greatly appreciated as per usual :-) Thanks.

Quote:Original post by Dragoncar
It never gets to the XPos = 5.0 as GetMessage is a blocking function, that is it does not return until after it has handled a message, which means that the loop condition is never false.

instead use PeekMessage this will allow your program to continue.

Thank you very much Dragoncar :-)

This document looks useful.

I still cant get it working :-( Anyone know of or got a very basic example?

this

Are you sure its not being reached. Also if its a float it should be 5.0f

You should really use PeekMessage.

Then what do I do with the ...

wc.lpfnWndProc   = (WNDPROC)WindowProc;

... part of my app?

hehe, I sorta got it working ......

Because my app only draws to the screen with the PAIN message, I just told it to paint every time, therefore processing it and passing that loop ....

	do	{	    //while(GetMessage(&msg, hWnd, 0, 0)) 		XPos += 0.001;		PostMessage(hWnd, WM_PAINT, 0, 0);		while(PeekMessage(&msg, hWnd, 0, 0, PM_REMOVE)) 		{			TranslateMessage(&msg);			DispatchMessage(&msg);	    }		//Frame?	} while (GameRuns == 1);

Dunno if it is the correct way to go about this, but it works ... Now for double buffering to get rid of the clicker :( ....

Well, my current game loop looks like this...


..and it works very well. No-one uses WM_PAINT for an app that continuously draws to it's window, such as a game. I just call ValidateRect(hWnd, NULL) in the WindowProc when a WM_PAINT message arrives, so that Windows doesn't send any more WM_PAINT messages. All my game code, including the rendering code, is called in the Update function. It's the best way to do it...

PS. You could replace the 1 in the while loop with your GameRuns variable for another way to end the program. I just use 1 and call PostQuitMessage when I want to quit the program.