CreateWindow returns NULL

[Jeff Adams]

I am using MSVC .NET to create a C program. I am having trouble creating a
window. The createwindow returns NULL however no error is caught. The
GetLastError() returns "operation completed successfully". So I'm not sure
what the deal is. CreateWindow doesn't have to be called from the main
function does it?
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0, 0,

GetModuleHandle(NULL), NULL, NULL, NULL, NULL,

"TestWindow", NULL };


RegisterClassEx(&wc);


if(NULL==(hWnd = CreateWindow("TestWindow", "Window",

WS_POPUP, 100, 100, 300, 300,

GetDesktopWindow(), NULL,
wc.hInstance, NULL )));

{

FormatMessage(

FORMAT_MESSAGE_ALLOCATE_BUFFER |

FORMAT_MESSAGE_FROM_SYSTEM |

FORMAT_MESSAGE_IGNORE_INSERTS,

NULL,

GetLastError(),

MAKELANGID(LANG_NEUTRAL,
SUBLANG_DEFAULT), // Default language

(LPTSTR) &lpMsgBuf,

0,

NULL);

MessageBox( NULL, (LPCTSTR)lpMsgBuf, "Error", MB_OK |
MB_ICONINFORMATION );

LocalFree( lpMsgBuf );

}

 

[Joona I Palaste]

I am using MSVC .NET to create a C program. I am having trouble creating a
window. The createwindow returns NULL however no error is caught. The
GetLastError() returns "operation completed successfully". So I'm not sure
what the deal is. CreateWindow doesn't have to be called from the main
function does it?
WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0, 0,

GetModuleHandle(NULL), NULL, NULL, NULL, NULL,

"TestWindow", NULL };

Your question is about system-specific extensions to C and therefore
off-topic on comp.lang.c. Please ask on
comp.os.ms-windows.programmer.win32.

 

[Flash Gordon]

I am using MSVC .NET to create a C program. I am having trouble creating a
window. The createwindow returns NULL however no error is caught. The
GetLastError() returns "operation completed successfully". So I'm not sure
what the deal is. CreateWindow doesn't have to be called from the main
function does it?

<snip>

This is windows specific stuff, so please ask on a Windows group. Here
we only deal with standard C, not system specifics.