C++窗口标题显示乱码问题求助（Visual Studio环境）

问题描述 #

在Visual Studio中开发基础C++ Win32项目，调用Win32 API创建窗口时，设置标题为"Yes"出现乱码，仅单字符标题显示正常，IDE无报错。

问题代码 #

#include <windows.h>

bool running = true;

void* buffer_memory;
BITMAPINFO buffer_bitmap_info;

LRESULT CALLBACK window_callback(HWND hwnd, UINT uMSG, WPARAM wParam, LPARAM lParam) {
    LRESULT result = 0;

    switch (uMSG) {
    case WM_CLOSE:
    case WM_DESTROY: {
        running = false;
    } break;

    case WM_SIZE: {
        RECT rect;
        GetClientRect(hwnd, &rect);
        int buffer_width = rect.right - rect.left;
        int buffer_height = rect.bottom - rect.top;

        int buffer_size = buffer_width * buffer_height * sizeof(unsigned int);

        if (buffer_memory) VirtualFree(buffer_memory, 0, MEM_RELEASE);
        buffer_memory = VirtualAlloc(0, buffer_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

        buffer_bitmap_info.bmiHeader.biSize = sizeof(buffer_bitmap_info.bmiHeader);
        buffer_bitmap_info.bmiHeader.biWidth = buffer_width;
        buffer_bitmap_info.bmiHeader.biHeight = -buffer_height;
        buffer_bitmap_info.bmiHeader.biPlanes = 1;
        buffer_bitmap_info.bmiHeader.biBitCount = 32;
        buffer_bitmap_info.bmiHeader.biCompression = BI_RGB;

    } break;

    default: {
        result = DefWindowProc(hwnd, uMSG, wParam, lParam);
    }

    }

    return result;
}

int main() {
    return WinMain(GetModuleHandle(NULL), NULL, GetCommandLineA(), SW_SHOW);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
    // Create Window Class
    WNDCLASSA window_class = {};
    window_class.style = CS_HREDRAW | CS_VREDRAW;
    window_class.lpszClassName = "Game_Window_Class";
    window_class.lpfnWndProc = window_callback;

    // Register Class
    RegisterClassA(&window_class);

    // Create Window
    CreateWindowA(window_class.lpszClassName, "Yes", WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 1920, 1080, 0, 0, hInstance, 0);

    while (running) {
        // Input
        MSG message;
        while (PeekMessageA(&message, 0, 0, 0, PM_REMOVE)) {
            TranslateMessage(&message);
            DispatchMessageA(&message);
        }

        // Simulate

        // Render
    }

    return 0;
}

问题原因 #

Visual Studio默认项目字符集为Unicode字符集，此时Win32 API的通用宏会自动映射到宽字符版本，但代码中显式使用了ANSI版本的API（CreateWindowA、RegisterClassA等），同时字符串字面量未做编码匹配处理，导致编码不兼容出现乱码。单字符标题正常是因为ASCII单字符在多数编码中兼容。

解决方法 #

提供两种可行方案，任选其一即可：

方案1：切换项目字符集为多字节字符集 #

1. 在Visual Studio中右键项目 → 属性
2. 进入"配置属性" → "常规"
3. 将"字符集"设置为"使用多字节字符集"
4. 重新编译运行，此时ANSI版本API与字符集匹配，乱码问题解决

方案2：改用Unicode版本API #

修改代码，统一使用宽字符版本的Win32 API和字符串：

#include <windows.h>

bool running = true;

void* buffer_memory;
BITMAPINFO buffer_bitmap_info;

LRESULT CALLBACK window_callback(HWND hwnd, UINT uMSG, WPARAM wParam, LPARAM lParam) {
    LRESULT result = 0;

    switch (uMSG) {
    case WM_CLOSE:
    case WM_DESTROY: {
        running = false;
    } break;

    case WM_SIZE: {
        RECT rect;
        GetClientRect(hwnd, &rect);
        int buffer_width = rect.right - rect.left;
        int buffer_height = rect.bottom - rect.top;

        int buffer_size = buffer_width * buffer_height * sizeof(unsigned int);

        if (buffer_memory) VirtualFree(buffer_memory, 0, MEM_RELEASE);
        buffer_memory = VirtualAlloc(0, buffer_size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);

        buffer_bitmap_info.bmiHeader.biSize = sizeof(buffer_bitmap_info.bmiHeader);
        buffer_bitmap_info.bmiHeader.biWidth = buffer_width;
        buffer_bitmap_info.bmiHeader.biHeight = -buffer_height;
        buffer_bitmap_info.bmiHeader.biPlanes = 1;
        buffer_bitmap_info.bmiHeader.biBitCount = 32;
        buffer_bitmap_info.bmiHeader.biCompression = BI_RGB;

    } break;

    default: {
        result = DefWindowProc(hwnd, uMSG, wParam, lParam);
    }

    }

    return result;
}

int main() {
    return WinMain(GetModuleHandle(NULL), NULL, GetCommandLineW(), SW_SHOW);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd) {
    // Create Window Class
    WNDCLASSW window_class = {};
    window_class.style = CS_HREDRAW | CS_VREDRAW;
    window_class.lpszClassName = L"Game_Window_Class";
    window_class.lpfnWndProc = window_callback;

    // Register Class
    RegisterClassW(&window_class);

    // Create Window
    CreateWindowW(window_class.lpszClassName, L"Yes", WS_OVERLAPPEDWINDOW | WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 1920, 1080, 0, 0, hInstance, 0);

    while (running) {
        // Input
        MSG message;
        while (PeekMessageW(&message, 0, 0, 0, PM_REMOVE)) {
            TranslateMessage(&message);
            DispatchMessage(&message);
        }

        // Simulate

        // Render
    }

    return 0;
}

修改点说明：

• 将WNDCLASSA改为WNDCLASSW，RegisterClassA改为RegisterClassW
• 将CreateWindowA改为CreateWindowW，字符串字面量前加L前缀（如L"Yes"）
• WinMain的参数LPSTR改为LPWSTR，GetCommandLineA改为GetCommandLineW
• PeekMessageA改为PeekMessageW

补充说明 #

如果希望代码兼容两种字符集，可以使用Win32的通用宏（如WNDCLASS、RegisterClass、CreateWindow），字符串使用TEXT("Yes")或_T("Yes")，此时会根据项目字符集自动切换ANSI/Unicode版本。

内容的提问来源于stack exchange，提问作者cf404