window 快速创建多个窗口

可以使用循环语句结合 CreateWindow 函数来快速创建多个窗口。例如，以下代码可以创建 10 个相同样式的窗口：

#include <windows.h>

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   PSTR szCmdLine, int iCmdShow)
{
    static TCHAR szAppName[] = TEXT("HelloWin");
    HWND         hwnd;
    MSG          msg;
    WNDCLASS     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) GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName  = NULL;
    wndclass.lpszClassName = szAppName;

    if (!RegisterClass(&wndclass))
    {
        MessageBox(NULL, TEXT("This program requires Windows NT!"),
                   szAppName, MB_ICONERROR);
        return 0;
    }

    for (int i = 0; i < 10; i++) {
        hwnd = CreateWindow(szAppName,                  // window class name
                            TEXT("The Hello Program"), // window caption
                            WS_OVERLAPPEDWINDOW,        // window style
                            CW_USEDEFAULT,              // initial x position
                            CW_USEDEFAULT,              // initial y position
                            CW_USEDEFAULT,              // initial x size
                            CW_USEDEFAULT,              // initial y size
                            NULL,                       // parent window handle
                            NULL,                       // window menu handle
                            hInstance,                  // program instance handle
                            NULL);                      // creation parameters

        if (hwnd == NULL)
        {
            MessageBox(NULL, TEXT("CreateWindow failed"),
                       szAppName, MB_ICONERROR);
            return 0;
        }

        ShowWindow(hwnd, iCmdShow);
        UpdateWindow(hwnd);
    }

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

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HDC         hdc;
    PAINTSTRUCT ps;
    RECT        rect;

    switch (message)
    {
    case WM_CREATE:
        return 0;

    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);

        GetClientRect(hwnd, &rect);

        DrawText(hdc, TEXT("Hello, Windows!"), -1, &rect,
                 DT_SINGLELINE | DT_CENTER | DT_VCENTER);

        EndPaint(hwnd, &ps);
        return 0;

    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}

此代码将创建 10 个具有相同样式的窗口，并在循环中处理每个窗口的消息。