CreateDialog Failed, but GetLastError return 0

[FatGarfield]

I want to create a modeless dialog in WinXP using .net 2003

code:

///////////////////////////////////////////////////////////////////////////
HWND hwnd;
hwnd = CreateDialog( ::g_hInstance, MAKEINTRESOURCE( IDD_CONTROL_PANEL ), NULL, ControlPanelProc );

if( NULL == hwnd ){

DWORD dwerr = GetLastError();
}

///////////////////////////////////////////////////////////////////////////////
when running the program, hwnd is NULL, and dwerr == 0 ( no error! ).
the same code segment works in another program
how to solve the problem, thanks for any help and advice.

[golanshahar]

I want to create a modeless dialog in WinXP using .net 2003

code:

///////////////////////////////////////////////////////////////////////////
HWND hwnd;
hwnd = CreateDialog( ::g_hInstance, MAKEINTRESOURCE( IDD_CONTROL_PANEL ), NULL, ControlPanelProc );

if( NULL == hwnd ){

DWORD dwerr = GetLastError();
}

///////////////////////////////////////////////////////////////////////////////
when running the program, hwnd is NULL, and dwerr == 0 ( no error! ).
the same code segment works in another program
how to solve the problem, thanks for any help and advice.

are you sure that in the resource file there is IDD_CONTROL_PANEL template dialog? and its not just declared in resource.h ?

Cheers

[FatGarfield]

I found where the error comes from. If you forgot to link comctl32.lib, but in the dialog template List control or Tree control exists, you'll get NULL window handle, but with error code 0.

thank you
golanshahar