Learning C++: No Window?

[knight666]

Hi,

I'm trying to learn C++, so I installed KDevelop and started a "Simple Win32 GUI App.".

I'm using the following code to get a window on the screen, most of which is from a book called "Tricks of the Windows Game Programming Gurus Second Edition".


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <windows.h>

#define WINDOW_CLASS_NAME "WINCLASS1"

LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
PAINTSTRUCT ps;
HDC hdc;

switch(msg)
{
case WM_CREATE:
{
return(0);
}
break;

case WM_PAINT:
{
hdc = BeginPaint(hwnd,&ps);
EndPaint(hwnd,&ps);
return(0);
}
break;

case WM_DESTROY:
{
PostQuitMessage(0);
return(0);
}
break;

default:break;
}
return (DefWindowProc(hwnd, msg, wparam, lparam));
}

int STDCALL
WinMain (HINSTANCE hInst, HINSTANCE hPrev, LPSTR lpCmd, int nShow)
{
MessageBox (NULL, "Hello, Windows!", "Hello", MB_OK);

WNDCLASSEX winclass;
HWND hwnd;
MSG msg;

winclass.cbSize = sizeof(WNDCLASSEX);
winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc = WindowProc;
winclass.cbClsExtra = 0;
winclass.cbWndExtra = 0;
winclass.hInstance = hInst;
winclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor = LoadCursor(NULL, IDC_ARROW);
//winclass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName = NULL;
winclass.lpszClassName = WINDOW_CLASS_NAME;
winclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

hwnd = CreateWindowEx(NULL,
WINDOW_CLASS_NAME,
"AwesoMe Window!",
WS_OVERLAPPEDWINDOW | WS_VISIBLE,
0,0,
400,400,
NULL,
NULL,
hInst,
NULL);

while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}

I am using the latest version of Wine at the time of writing (1.1.0).
The messagebox at the beginning shows up, but the window doesn't.:confused:

When I run the program in a terminal, I don't get any messages from Wine.

Is there something wrong with my code or is there something wrong with Wine?

Thanks in advance.

[nvteighen]

Are you sure that's C++? It looks like C to me.

[Zugzwang]

You didn't register the window class prior to using it. See here (http://msdn.microsoft.com/en-us/library/ms632680(VS.85).aspx) for details. Also don't forget to add code for checking for error values (I would assume that CreateWindowEx returned NULL).

As far as the C++/C issue from the last message is concerned: It looks like the OP only used parts defined in both languages, so it is technically speaking both at the same time.

[dribeas]

Hi,

I'm trying to learn C++, so I installed KDevelop and started a "Simple Win32 GUI App.".


I think you'll be better off asking in a windows-related c++ programming forum. Most of the code is windows-only and the problems are Win32 GUI related.