程序代码：

#include <windows.h>

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

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   PSTR      szCmdLine,
                   int       iCmdShow)
{
    TCHAR    szAppName[] = "HelloWnd";
    WNDCLASS wc;
    HWND     hWnd;
    MSG      msg;

    wc.style         = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName  = NULL;
    wc.lpszClassName = szAppName;

    if(!RegisterClass(&wc)) {
        MessageBox(NULL, TEXT("Register class failed, program will to exit!"), szAppName, MB_OK | MB_ICONERROR);
        return 0;
    }

    hWnd = CreateWindow(szAppName,
                        TEXT("The Hello world program."),
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,
                        CW_USEDEFAULT,
                        NULL,
                        NULL,
                        hInstance,
                        NULL);

    ShowWindow(hWnd, iCmdShow);
    UpdateWindow(hWnd);

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

    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND   hWnd,
                         UINT   msg,
                         WPARAM wParam,
                         LPARAM lParam)
{
    static int   cxClient, cyClient, cxChar, cxCaps, cyChar;
    static TCHAR hello[] = "Hello, world!";
    TEXTMETRIC   tm;
    PAINTSTRUCT  ps;
    HDC          hDC;

    switch(msg) {
    case WM_CREATE:
        hDC = GetDC(hWnd);

        GetTextMetrics(hDC, &tm);
        cxChar = tm.tmAveCharWidth;
        cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2;
        cyChar = tm.tmHeight + tm.tmExternalLeading;

        ReleaseDC(hWnd, hDC);
        return 0;
    case WM_SIZE:
        cxClient = LOWORD(lParam);
        cyClient = HIWORD(lParam);
        return 0;
    case WM_PAINT:
        hDC = BeginPaint(hWnd, &ps);

        TextOut(hDC, (cxClient - cxCaps * lstrlen(hello)) / 2, (cyClient - cyChar) / 2, hello, lstrlen(hello));

        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return DefWindowProc(hWnd, msg, wParam, lParam);
}

程序代码：

#include <gtk/gtk.h>

GdkPixbuf *creat_pixbuf(const gchar *file)
{
    GdkPixbuf *pixbuf;
    GError *error = NULL;
    pixbuf = gdk_pixbuf_new_from_file(file, &error);
    if (!pixbuf)
    {
        fprintf(stderr, "%s\n", error->message);
        g_error_free(error);
    }
    
    return pixbuf;
}

int main(int argc, char **argv)
{
    /*定义一个窗口指针*/
    GtkWidget *main_window;
    
    /*初始化*/
    gtk_init(&argc, &argv);
    
    /*创建一个窗口*/
    main_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    
    /*设置窗口标题*/
    gtk_window_set_title(GTK_WINDOW(main_window), "Yucoat!");
    
    /*设置窗口默认大小*/
    gtk_window_set_default_size(GTK_WINDOW(main_window), 280, 200);
    
    /*设置窗口所在位置*/
    gtk_window_set_position(GTK_WINDOW(main_window), GTK_WIN_POS_CENTER);
    
    /*设置窗口图标*/
    gtk_window_set_icon(GTK_WINDOW(main_window), creat_pixbuf("music.png"));
    
    g_signal_connect(main_window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
    /*显示窗口*/
    gtk_widget_show(main_window);

    gtk_main();

    return 0;
}