一段windows下截全屏保存成bmp的完整代码

#include <windows.h>
#include <stdio.h>

// BMP 文件头大小
const int BMP_FILE_HEADER_SIZE = 14;
const int BMP_INFO_HEADER_SIZE = 40;

void CaptureScreenAndSaveAsBMP(const wchar_t* filename)
{
    // 获取屏幕尺寸
    int screenWidth = GetSystemMetrics(SM_CXSCREEN);
    int screenHeight = GetSystemMetrics(SM_CYSCREEN);

    // 创建一个设备描述表（DIB）位图来保存屏幕截图
    HDC hdcMemory = CreateCompatibleDC(NULL);
    HBITMAP hbmScreen = CreateCompatibleBitmap(GetDC(NULL), screenWidth, screenHeight);
    SelectObject(hdcMemory, hbmScreen);

    // 捕获屏幕内容
    HDC hdcScreen = GetDC(NULL);
    BitBlt(hdcMemory, 0, 0, screenWidth, screenHeight, hdcScreen, 0, 0, SRCCOPY);

    // 创建 BMP 文件
    HANDLE hFile = CreateFileW(filename, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
    if (hFile == INVALID_HANDLE_VALUE) {
        printf("无法创建文件 %s\n", filename);
        return;
    }

    // 计算 BMP 文件大小
    DWORD dwFileSize = BMP_FILE_HEADER_SIZE + BMP_INFO_HEADER_SIZE + screenWidth * screenHeight * 4;

    // 填充 BMP 文件头
    BITMAPFILEHEADER bfh;
    bfh.bfType = 0x4D42; // 'BM' 字符
    bfh.bfSize = dwFileSize;
    bfh.bfReserved1 = 0;
    bfh.bfReserved2 = 0;
    bfh.bfOffBits = BMP_FILE_HEADER_SIZE + BMP_INFO_HEADER_SIZE;

    // 填充 BMP 信息头
    BITMAPINFOHEADER bih;
    ZeroMemory(&bih, sizeof(bih));
    bih.biSize = BMP_INFO_HEADER_SIZE;
    bih.biWidth = screenWidth;
    bih.biHeight = -screenHeight; // 为了正确显示图像，高度应该是负数
    bih.biPlanes = 1;
    bih.biBitCount = 32;
    bih.biCompression = BI_RGB;
    bih.biSizeImage = 0; // 由 biBitCount 确定
    bih.biXPelsPerMeter = 0;
    bih.biYPelsPerMeter = 0;
    bih.biClrUsed = 0;
    bih.biClrImportant = 0;

    // 从 HBITMAP 读取像素数据
    DWORD dwScanLine = screenWidth * 4;
    BYTE* pBuffer = new BYTE[dwScanLine * screenHeight];
    GetBitmapBits(hbmScreen, dwScanLine * screenHeight, pBuffer);

    // 写入 BMP 文件头和信息头
    DWORD dwWritten;
    WriteFile(hFile, &bfh, sizeof(bfh), &dwWritten, NULL);
    WriteFile(hFile, &bih, sizeof(bih), &dwWritten, NULL);

    // 写入像素数据（从上往下写入）  
    WriteFile(hFile, pBuffer, dwScanLine * screenHeight, &dwWritten, NULL);

    delete[] pBuffer;
    CloseHandle(hFile);

    // 清理资源
    DeleteObject(hbmScreen);
    DeleteDC(hdcMemory);
    ReleaseDC(NULL, hdcScreen);
}

int main()
{
    // 设置输出文件名
    wchar_t filename[] = L"screen_capture.bmp";

    // 调用函数截图并保存为 BMP
    CaptureScreenAndSaveAsBMP(filename);

    return 0;
}

一段windows下截全屏保存成bmp的完整代码，vs里创建控制台工程，代码拷贝进去编译后运行exe程序即可看到在程序目录下保存的屏幕图片