桌面截屏

 

　　

//捕获桌面屏幕
BOOL CFunction::ScreenCapture()
{
    // 获取桌面窗口句柄
    HWND hDesktopWnd = ::GetDesktopWindow();
    if (hDesktopWnd == NULL)
    {
        return FALSE;
    }

    // 获取桌面窗口DC
    HDC hdc = ::GetDC(hDesktopWnd);
    if (hdc == NULL)
    {
        return FALSE;
    }

    // 创建兼容DC
    HDC mdc = ::CreateCompatibleDC(hdc);
    if (mdc == NULL)
    {
        return FALSE;
    }

    // 获取计算机屏幕的宽和高
    DWORD dwScreenWidth = ::GetSystemMetrics(SM_CXSCREEN);
    if (dwScreenWidth == NULL)
    {
        return FALSE;
    }
    DWORD dwScreenHeight = ::GetSystemMetrics(SM_CYSCREEN);
    if (dwScreenHeight == NULL)
    {
        return FALSE;
    }

    // 创建兼容位图
    HBITMAP bmp = ::CreateCompatibleBitmap(hdc, dwScreenWidth, dwScreenHeight);
    if (bmp == NULL)
    {
        return FALSE;
    }

    // 选中位图
    HBITMAP holdbmp = (HBITMAP)::SelectObject(mdc, bmp);
    if (holdbmp == NULL)
    {
        return FALSE;
    }

    // 将窗口内容绘制到位图上
    ::BitBlt(mdc, 0, 0, dwScreenWidth, dwScreenHeight, hdc, 0, 0, SRCCOPY);

    // 绘制鼠标
    PaintMouse(mdc);

    // 保存为图片
    SaveBmp(bmp);

    return TRUE;
}

//绘制鼠标
BOOL CFunction::PaintMouse(HDC hdc)
{
    // 创建兼容DC
    HDC bufdc = ::CreateCompatibleDC(hdc);

    //获取光标信息
    CURSORINFO cursorInfo = { sizeof(CURSORINFO) };
    ::GetCursorInfo(&cursorInfo);

    // 获取光标的图标信息
    ICONINFO iconInfo = { 0 };
    ::GetIconInfo(cursorInfo.hCursor, &iconInfo);

    // 绘制白底黑鼠标(AND)
    ::SelectObject(bufdc, iconInfo.hbmMask);
    ::BitBlt(hdc, cursorInfo.ptScreenPos.x, cursorInfo.ptScreenPos.y, 20, 20, bufdc, 0, 0, SRCAND);

    // 绘制黑底彩色鼠标(OR)
    ::SelectObject(bufdc, iconInfo.hbmColor);
    ::BitBlt(hdc, cursorInfo.ptScreenPos.x, cursorInfo.ptScreenPos.y, 20, 20,
        bufdc, 0, 0, SRCPAINT);

    // 释放资源
    DeleteObject(iconInfo.hbmColor);
    DeleteObject(iconInfo.hbmMask);
    DeleteDC(bufdc);

    return TRUE;
}

//保存为图片
BOOL CFunction::SaveBmp(HBITMAP hBmp)
{
    CImage image;

    // 附加位图句柄
    image.Attach(hBmp);

    // 保存成JPG格式图片
    image.Save(_T("mybmp1.jpg"));

    return TRUE;
}