Окно на весь экран

#include <windows.h>
 
#define WMAIN_CLASSNAME             "Cyberforum_WndClass"
#define WMAIN_CAPTION               ""
 
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam, LPARAM lParam);
 
 
int APIENTRY WinMain(HINSTANCE hInst,HINSTANCE hPrev,LPTSTR cmd,int md)
{
    HWND hWnd;
    MSG msg;
    WNDCLASSEX wc;
    wc.cbClsExtra=0;
    wc.cbWndExtra=0;
    wc.cbSize=sizeof(wc);
    wc.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);
    wc.hCursor=LoadCursor(NULL,IDC_ARROW);
    wc.hIcon=wc.hIconSm=LoadIcon(NULL,IDI_WINLOGO);
    wc.hInstance=hInst;
    wc.lpfnWndProc=WndProc;
    wc.style=CS_HREDRAW | CS_VREDRAW;
    wc.lpszClassName=WMAIN_CLASSNAME;
    wc.lpszMenuName=NULL;
 
    if(!RegisterClassEx(&wc))
        return 0;
 
    hWnd=CreateWindowEx(WS_EX_TOPMOST,WMAIN_CLASSNAME,WMAIN_CAPTION,WS_VISIBLE | WS_POPUP | WS_MAXIMIZE,CW_USEDEFAULT,CW_USEDEFAULT,500,300,HWND_DESKTOP,NULL,hInst,0);
 
    if (!hWnd)
        return 0;
 
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}
 
 
LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam, LPARAM lParam)
{
    PAINTSTRUCT ps;
    HDC hdc;
    switch (message)
    {
    case WM_SIZE:
        InvalidateRect(hWnd,NULL,true);
        break;
    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
 
        EndPaint(hWnd,&ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default: 
        return DefWindowProc(hWnd,message,wParam,lParam);
    }
    return 0;
}