Keskustelu: Ohjelmointikysymykset: C++: WinAPI Selvennys

#include <windows.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    MSG msg ;
    WNDCLASSEX wndclass ;

    wndclass.cbSize = sizeof (wndclass) ;
    wndclass.style = CS_HREDRAW | CS_VREDRAW ;
    wndclass.lpfnWndProc = WndProc ;
    wndclass.cbClsExtra = 0 ;
    wndclass.cbWndExtra = 0 ;
    wndclass.hInstance = hInstance ;
    wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
    wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
    wndclass.hbrBackground = (HBRUSH) COLOR_WINDOW ;
    wndclass.lpszMenuName = NULL ;
    wndclass.lpszClassName = "OmaLuokka" ;     wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ;

    RegisterClassEx (&wndclass) ;
    HWND hwnd = CreateWindow ("OmaLuokka",
        "Päivää maailma!",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL) ;

    ShowWindow (hwnd, iCmdShow) ;
    while (GetMessage (&msg, NULL, 0, 0) == TRUE)     {
        TranslateMessage (&msg) ;
        DispatchMessage (&msg) ;
    }

    return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    switch (iMsg)
    {
    case WM_DESTROY:
        PostQuitMessage (0);
        return 0;
    }

    return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
}