When I typed in the tutorials word-by-word, everything works great. But, when I do anything from scratch, ChoosePixelFormat fails. I''m basically going through exactly the same steps as in the tutorials, and creating the windows with exactly the same specifications. It can''t be a problem with my hardware not supporting it, because I''m using the same pixel format I used in the tutorial. It can''t be a problem with the PIXELFORAMTDESCRIPTOR struct, because after it failed the first time I c&p''d it from the tutorials. I''ve tried everything I can possibly think of, and a whole bunch of things that would seem to have nothing to do with the problem, but it still never works. Finally, when I used FormatMessage with GetLastError, I get the message "The Operation Completed Successfully". (Also, I know that ChoosePixelFormat is setting the last error because before I called it I used SetLastError (1) and ChoosePixelFormat set it back to zero). Please help, I''m kind of paralyzed trying to fix this problem. -RWarden (roberte@maui.net)

Here''s all the code minus error checking, in the order it''s called in my init function. This is the first code that executes when the program starts up:

// Window class:
wc.style = CS_HREDRAW / CS_VREDRAW / CS_OWNDC;
wc.lpfnWndProc = (WNDPROC) WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = 0;
wc.hIcon = LoadIcon ( NULL, IDI_WINLOGO );
wc.hCursor = LoadCursor ( NULL, IDC_ARROW );
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = NAME;
RegisterClass ( &wc );

// Fullscreen switch:
memset ( &dm, 0, sizeof ( dm ) );
dm.dmSize = sizeof ( dm );
dm.dmPelsWidth = 800;
dm.dmPelsHeight = 600;
dm.dmBitsPerPel = 16;
dm.dmFields = DM_BITSPERPEL / DM_PELSWIDTH / DM_PELSHEIGHT;
ChangeDisplaySettings ( &dm, CDS_FULLSCREEN );

// Window creation:
g_hwndMain = CreateWindowEx ( WS_EX_APPWINDOW, NAME, TITLE, WS_POPUP / WS_CLIPSIBLINGS / WS_CLIPCHILDREN, 0, 0, 800, 600, NULL, NULL, hInstance, NULL );

// Pixelformatdescriptor:
static PIXELFORMATDESCRIPTOR pfd =
{ sizeof ( PIXELFORMATDESCRIPTOR ), 1, PFD_DRAW_TO_WINDOW /
PFD_SUPPORT_OPENGL / PFD_DOUBLEBUFFER, PFD_TYPE_RGBA,
16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 0, 0,
PFD_MAIN_PLANE, 0, 0, 0, 0 };

// GetDC/ChoosePixelFormat:
g_hDC = GetDC ( g_hwndMain );
pf = ChoosePixelFormat ( g_hDC, &pfd );

ChoosePixelFormat always returns zero.

-RWarden (roberte@maui.net)

Yes... ChoosePixelFormat returns zero every time you execute it! But it's not an error!!!

I don't know why, but it works with pixelformat=0. I thought that a zero indicates that your PF is the PF you've requested, but if you do nothing about choosing,setting,etc. it won't work!

try this:

pixelformat = ChoosePixelformat( hDC, &pfd );
SetPixelFormat( hDC, pixelformat, &pfd );
DescribePixelFormat( -what ever it expects- );

Edited by - WickedImp on June 28, 2000 11:07:16 AM