using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;
namespace GetFormDemo.Comm
{
public struct RECT
{
public int x1;
public int y1;
public int x2;
public int y2;
}
class ScreenCapture
{
[DllImport("user32.dll")]
private static extern IntPtr GetDC(IntPtr hwnd);
[DllImport("user32.dll")]
private static extern IntPtr ReleaseDC(IntPtr hc, IntPtr hDest);
[DllImport("user32.dll")]
private static extern IntPtr GetWindowDC(IntPtr hwnd);
[DllImport("user32.dll")]
private static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
private static extern IntPtr GetWindowRect(IntPtr hWnd, out RECT rect);
[DllImport("user32.dll")]
private static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags);
[DllImport("user32.dll")]
private static extern IntPtr GetDesktopWindow();
[DllImport("gdi32.dll")]
private static extern IntPtr CreateDC(
string lpszDriver, // driver name驱动名
string lpszDevice, // device name设备名
string lpszOutput, // not used; should be NULL
IntPtr lpInitData // optional printer data
);
[DllImport("gdi32.dll")]
private static extern int BitBlt(
IntPtr hdcDest, // handle to destination DC目标设备的句柄
int nXDest, // x-coord of destination upper-left corner目标对象的左上角的X坐标
int nYDest, // y-coord of destination upper-left corner目标对象的左上角的Y坐标
int nWidth, // width of destination rectangle目标对象的矩形宽度
int nHeight, // height of destination rectangle目标对象的矩形长度
IntPtr hdcSrc, // handle to source DC源设备的句柄
int nXSrc, // x-coordinate of source upper-left corner源对象的左上角的X坐标
int nYSrc, // y-coordinate of source upper-left corner源对象的左上角的Y坐标
CopyPixelOperation dwRop // raster operation code光栅的操作值
);
//static extern int BitBlt(IntPtr hdcDest, int xDest, int yDest, int
//wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleDC(
IntPtr hdc // handle to DC
);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateCompatibleBitmap(
IntPtr hdc, // handle to DC
int nWidth, // width of bitmap, in pixels
int nHeight // height of bitmap, in pixels
);
[DllImport("gdi32.dll")]
private static extern IntPtr SelectObject(
IntPtr hdc, // handle to DC
IntPtr hgdiobj // handle to object
);
[DllImport("gdi32.dll")]
private static extern int DeleteDC(
IntPtr hdc // handle to DC
);
/// <summary>
/// 抓取屏幕(层叠的窗口)
/// </summary>
/// <param name="x">左上角的横坐标</param>
/// <param name="y">左上角的纵坐标</param>
/// <param name="width">抓取宽度</param>
/// <param name="height">抓取高度</param>
/// <returns></returns>
public Bitmap CaptureScreen(int x, int y, int width, int height)
{
Bitmap bmp = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(bmp))
{
g.CopyFromScreen(new Point(x, y), new Point(0, 0), bmp.Size);
g.Dispose();
}
//bit.Save(@"capture2.png");
return bmp;
}
/// <summary>
/// 抓取整个屏幕
/// </summary>
/// <returns></returns>
public Bitmap CaptureScreen()
{
Size screenSize = Screen.PrimaryScreen.Bounds.Size;
return CaptureScreen(0, 0, screenSize.Width, screenSize.Height);
}
/// <summary>
/// 全屏截图
/// </summary>
/// <returns></returns>
public Image CaptureScreenI()
{
return CaptureWindow(GetDesktopWindow());
}
/// <summary>
/// 全屏指定区域截图
/// </summary>
/// <returns></returns>
public Image CaptureScreenI(RECT rect)
{
return CaptureWindow(GetDesktopWindow(), rect);
}
/// <summary>
/// 指定窗口截图
/// </summary>
/// <param name="handle">窗口句柄. (在windows应用程序中, 从Handle属性获得)</param>
/// <returns></returns>
public Bitmap CaptureWindow(IntPtr hWnd)
{
IntPtr hscrdc = GetWindowDC(hWnd);
RECT rect = new RECT();
return CaptureWindow(hWnd, rect);
}
/// <summary>
/// 指定窗口区域截图
/// </summary>
/// <param name="handle">窗口句柄. (在windows应用程序中, 从Handle属性获得)</param>
/// <param name="rect">窗口中的一个区域</param>
/// <returns></returns>
public Bitmap CaptureWindow(IntPtr hWnd, RECT rect)
{
// 获取设备上下文环境句柄
IntPtr hscrdc = GetWindowDC(hWnd);
// 创建一个与指定设备兼容的内存设备上下文环境（DC）
IntPtr hmemdc = CreateCompatibleDC(hscrdc);
IntPtr myMemdc = CreateCompatibleDC(hscrdc);
// 返回指定窗体的矩形尺寸
RECT rect1;
GetWindowRect(hWnd, out rect1);
// 返回指定设备环境句柄对应的位图区域句柄
IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, rect1.x2 - rect1.x1, rect1.y2 - rect1.y1);
IntPtr myBitmap = CreateCompatibleBitmap(hscrdc, rect.x2 - rect.x1, rect.y2 - rect.y1);
//把位图选进内存DC
// IntPtr OldBitmap = (IntPtr)SelectObject(hmemdc, hbitmap);
SelectObject(hmemdc, hbitmap);
SelectObject(myMemdc, myBitmap);
/////////////////////////////////////////////////////////////////////////////
//
// 下面开始所谓的作画过程，此过程可以用的方法很多，看你怎么调用 API 了
//
/////////////////////////////////////////////////////////////////////////////
// 直接打印窗体到画布
PrintWindow(hWnd, hmemdc, 0);
// IntPtr hw = GetDesktopWindow();
// IntPtr hmemdcClone = GetWindowDC(myBitmap);
BitBlt(myMemdc, 0, 0, rect.x2 - rect.x1, rect.y2 - rect.y1, hmemdc, rect.x1, rect.y1, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
//SelectObject(myMemdc, myBitmap);
Bitmap bmp = Bitmap.FromHbitmap(myBitmap);
DeleteDC(hscrdc);
DeleteDC(hmemdc);
DeleteDC(myMemdc);
return bmp;
}
/// <summary>
/// 指定窗口截图 保存为图片文件
/// </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>
/// 全屏截图 保存为文件
/// </summary>
/// <param name="filename"></param>
/// <param name="format"></param>
public void CaptureScreenToFile(string filename, ImageFormat format)
{
Image img = CaptureScreen();
img.Save(filename, format);
}
/// <summary>
/// 设置 RECT 的左下右上
/// </summary>
/// <param name="rect">给出要设定的 RECT</param>
/// <param name="left">左边</param>
/// <param name="bottom">下边</param>
/// <param name="right">右边</param>
/// <param name="top">上边</param>
public void SetRECT(ref RECT rect, int x1, int y1, int x2, int y2)
{
rect.x1 = x1;
rect.y1 = y1;
rect.x2 = x2;
rect.y2 = y2;
}
/// <summary>
/// 合并图片
/// </summary>
/// <param name="bmp1">图片1</param>
/// <param name="bmp2">图片2</param>
public Bitmap HBpic(Bitmap bmp1, Bitmap bmp2)
{
Bitmap newBmp = new Bitmap(bmp1.Width, bmp1.Height + bmp2.Height);
var g = Graphics.FromImage(newBmp);
g.DrawImage(bmp1, 0, 0);
g.DrawImage(bmp2, 0, bmp1.Height);
return newBmp;
}
}
}