帮我写一段利用windows API自动截取桌面图像并保存图像的代码

好的，以下是利用 Windows API 自动截取桌面图像并保存图像的代码：

#include <Windows.h>

int main()
{
    // 获取屏幕大小
    int screenWidth = GetSystemMetrics(SM_CXSCREEN);
    int screenHeight = GetSystemMetrics(SM_CYSCREEN);

    // 创建设备上下文
    HDC hDC = GetDC(NULL);
    HDC hCaptureDC = CreateCompatibleDC(hDC);

    // 创建位图
    HBITMAP hBitmap = CreateCompatibleBitmap(hDC, screenWidth, screenHeight);
    SelectObject(hCaptureDC, hBitmap);

    // 截取屏幕图像
    BitBlt(hCaptureDC, , , screenWidth, screenHeight, hDC, , , SRCCOPY);

    // 保存图像
    BITMAP bmp;
    GetObject(hBitmap, sizeof(BITMAP), &bmp);
    BITMAPFILEHEADER bfh;
    BITMAPINFOHEADER bih;
    bih.biSize = sizeof(BITMAPINFOHEADER);
    bih.biWidth = bmp.bmWidth;
    bih.biHeight = bmp.bmHeight;
    bih.biPlanes = 1;
    bih.biBitCount = bmp.bmBitsPixel;
    bih.biCompression = BI_RGB;
    bih.biSizeImage = bmp.bmWidthBytes * bmp.bmHeight;
    bfh.bfType = x4d42;
    bfh.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + bih.biSizeImage;
    bfh.bfReserved1 = ;
    bfh.bfReserved2 = ;
    bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
    HANDLE hFile = CreateFile(L"screen.bmp", GENERIC_WRITE, , NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    DWORD dwWritten;
    WriteFile(hFile, &bfh, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
    WriteFile(hFile, &bih, sizeof(BITMAPINFOHEADER), &dwWritten, NULL);
    WriteFile(hFile, bmp.bmBits, bih.biSizeImage, &dwWritten, NULL);
    CloseHandle(hFile);

    // 释放资源
    DeleteObject(hBitmap);
    DeleteDC(hCaptureDC);
    ReleaseDC(NULL, hDC);

    return ;
}