Edison.X. Blog

#include <windows.h>

const char g_szClassName[] = "myWindowClass"; /* 程式名稱 */
// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{    
    switch(msg)
    {
        case WM_CLOSE:
            DestroyWindow(hwnd);
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    //Step 1: Registering the Window Class
    // -------------------------------------------------------------
    // system
    wc.cbSize        = sizeof(WNDCLASSEX); // 固定
    wc.lpfnWndProc   = WndProc;            // 訊息處理
    wc.cbClsExtra    = 0;                  // 設0
    wc.cbWndExtra    = 0;                  // 設0
    wc.hInstance     = hInstance;          // 固定
    // -------------------------------------------------------------
    // style
    wc.style         = 0;                  // 風格
    wc.lpszClassName = g_szClassName;      // class namme
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);        // 背景顏色

    // -------------------------------------------------------------
    // resource
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);     // 設定 curosr
    wc.lpszMenuName  = NULL;                            // 載入 menu
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION); // 設定 icon
    wc.hIconSm       = LoadIcon(NULL, IDI_APPLICATION); // icon
    // -------------------------------------------------------------

    if(!RegisterClassEx(&wc))
    {
        MessageBox(NULL, "Window Registration Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    // Step 2: Creating the Window
    hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,
        g_szClassName,
        "The title of my window",
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
        NULL, NULL, hInstance, NULL);

    if(hwnd == NULL)
    {
        MessageBox(NULL, "Window Creation Failed!", "Error!",
            MB_ICONEXCLAMATION | MB_OK);
        return EXIT_FAILURE;
    }

    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    // Step 3: The Message Loop
    while(GetMessage(&Msg, NULL, 0, 0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}