再C#中QQ截图的代码怎么写
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发布时间：2022-05-05 07:47
共2个回答
热心网友
时间：2023-10-16 05:30
QQ截图的核心其实就是调用WINDOWS API函数，主要涉及两个核心组件, user32.dll和gdi32.dll。
如下是，C#代码调用上述两个核心组件的完整示例：
namespace WindowsFormsApplication1{
/// <summary>
/// 屏幕捕获类
/// </summary>
public class ScreenCapture
{
/// <summary>
/// 创建一个包含整个桌面的截图Image对象(捕获到的桌面是当前WINDOWS操作系统活动桌面)
/// </summary>
/// <returns></returns>
public Image CaptureScreen()
{
return CaptureWindow(User32.GetDesktopWindow());
}
/// <summary>
/// 创建一个包含特定窗口的截图Image对象
/// </summary>
/// <param name="handle">启动本程序的句柄窗口(在Windows上这是由Handle属性获得）</param>
/// <returns></returns>
public Image CaptureWindow(IntPtr handle)
{
// 获取目标窗口的HDC
IntPtr hdcSrc = User32.GetWindowDC(handle);
// 获取它的大小
User32.RECT windowRect = new User32.RECT();
User32.GetWindowRect(handle, ref windowRect);
int width = windowRect.right - windowRect.left;
int height = windowRect.bottom - windowRect.top;
// 创建设备上下文对象
IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, width, height);
IntPtr hOld = GDI32.SelectObject(hdcDest, hBitmap);
GDI32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32.SRCCOPY);
GDI32.SelectObject(hdcDest, hOld);
GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle, hdcSrc);
Image img = Image.FromHbitmap(hBitmap);
GDI32.DeleteObject(hBitmap);
return img;
}
/// <summary>
/// 获取特定窗口，并保存它
/// </summary>
/// <param name="handle"></param>
/// <param name="filename"></param>
/// <param name="format"></param>
public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
{
Image img = CaptureWindow(handle);
img.Save(filename, format);
}
/// <summary>
/// 捕获整个windows活动窗口并保存它
/// </summary>
/// <param name="filename"></param>
/// <param name="format"></param>
public void CaptureScreenToFile(string filename, ImageFormat format)
{
Image img = CaptureScreen();
img.Save(filename, format);
}
/// <summary>
/// GDI32 相关的API函数
/// </summary>
private class GDI32
{
public const int SRCCOPY = 0x00CC0020;
[DllImport("gdi32.dll")]
public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest,
int nWidth, int nHeight, IntPtr hObjectSource,
int nXSrc, int nYSrc, int dwRop);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth,
int nHeight);
[DllImport("gdi32.dll")]
public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteDC(IntPtr hDC);
[DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
}
/// <summary>
/// User32 API相关函数
/// </summary>
private class User32
{
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
[DllImport("user32.dll")]
public static extern IntPtr GetDesktopWindow();
[DllImport("user32.dll")]
public static extern IntPtr GetWindowDC(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
[DllImport("user32.dll")]
public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);
}
}
}
// 调用示例：
private void button1_Click(object sender, EventArgs e)
{
ScreenCapture sc = new ScreenCapture();
// 捕获整个屏幕并保存到一个文件里
Image img = sc.CaptureScreen();
// 将捕获的图片显示在图片控件里
this.pictureBox1.Image = img;
// 捕获当前运行窗体并保存在C盘,文件名和后缀为temp.png
sc.CaptureWindowToFile(this.Handle, "C:\\temp.png", ImageFormat.Gif);
}
热心网友
时间：2023-10-16 05:30
