c++中的SetWindowTextW()帮助器函数

BOOL SetWindowTextW(
  HWND hWnd,    // 窗口的句柄
  LPCWSTR lpString // 要设置的窗口文本的指针
);

#include <windows.h>

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
    switch (msg) {
        case WM_CREATE:
            // 窗口创建完成后设置文本
            SetWindowTextW(hwnd, L"Hello, World!");
            break;
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProcW(hwnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
    const wchar_t CLASS_NAME[] = L"SampleWindowClass";

    WNDCLASSW wc = {};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = CLASS_NAME;

    RegisterClassW(&wc);

    HWND hwnd = CreateWindowExW(
        0,                              // Optional window styles.
        CLASS_NAME,                     // Window class
        L"Learn to Program Windows",     // Window text
        WS_OVERLAPPEDWINDOW,            // Window style
        CW_USEDEFAULT, CW_USEDEFAULT,   // Position (x, y)
        CW_USEDEFAULT, CW_USEDEFAULT,   // Size (width, height)
        NULL,                           // Parent window    
        NULL,                           // Menu
        hInstance,                      // Instance handle
        NULL                            // Additional application data
    );

    if (hwnd == NULL) {
        return 0;
    }

    ShowWindow(hwnd, nCmdShow);

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

    return msg.wParam;
}