using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.IO;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace RichCreator.Utility.Captures
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{
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public class BitBltCapture:ICapture
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{
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/// <summary>
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/// 截屏
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/// </summary>
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/// <returns></returns>
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public Bitmap CaptureScreen()
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{
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return CaptureWindow(Utils.GetDesktopWindow(),-1,-1,-1,-1);
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}
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/// <summary>
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/// 截取指定区域
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/// </summary>
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/// <param name="x"></param>
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/// <param name="y"></param>
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/// <param name="width"></param>
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/// <param name="height"></param>
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/// <returns></returns>
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public Bitmap CaptureScreen(Int32 x,Int32 y,Int32 width,Int32 height)
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{
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return CaptureWindow(Utils.GetDesktopWindow(),x,y,width,height);
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}
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/// <summary>
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/// Creates an Image object containing a screen shot of a specific window
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/// </summary>
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/// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
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/// <returns></returns>
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private static Bitmap CaptureWindow(IntPtr handle,Int32 x,Int32 y,Int32 width,Int32 height)
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{
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//todo:只截取部分的图
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// get te hDC of the target window
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IntPtr hdcSrc = Utils.GetWindowDC(handle);
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// get the size
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Utils.Rect rect = new Utils.Rect();
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Utils.GetWindowRect(handle, ref rect);
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int screenWidth = 0;
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int screenHeight = 0;
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Utils.GetWindowSize(out screenWidth, out screenHeight);
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if (x < 0 || y < 0 || width <= 0 || height <= 0 || (x + width) > screenWidth || (y + height) > screenHeight)
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{
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x = 0;
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y = 0;
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width = screenWidth;
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height = screenHeight;
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}
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// create a device context we can copy to
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IntPtr hdcDest = Utils.CreateCompatibleDC(hdcSrc);
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// create a bitmap we can copy it to,
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// using GetDeviceCaps to get the width/height
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IntPtr hBitmap = Utils.CreateCompatibleBitmap(hdcSrc, width, height);
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// select the bitmap object
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IntPtr hOld = Utils.SelectObject(hdcDest, hBitmap);
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// bitblt over
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Utils.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, x, y, Utils.SRCCOPY);
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// restore selection
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Utils.SelectObject(hdcDest, hOld);
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// clean up
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Utils.DeleteDC(hdcDest);
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Utils.ReleaseDC(handle, hdcSrc);
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// get a .NET image object for it
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Bitmap img = Bitmap.FromHbitmap(hBitmap);
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// free up the Bitmap object
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Utils.DeleteObject(hBitmap);
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return img;
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}
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/// <summary>
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/// Captures a screen shot of the entire desktop, and saves it to a file
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/// </summary>
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/// <param name="fileName"></param>
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/// <param name="format"></param>
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public void CaptureScreenToFile(string fileName)
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{
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CaptureScreenToFile(fileName, ImageFormat.Jpeg);
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}
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/// <summary>
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/// Captures a screen shot of the entire desktop, and saves it to a file
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/// </summary>
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/// <param name="fileName"></param>
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/// <param name="format"></param>
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public void CaptureScreenToFile(string fileName, ImageFormat format)
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{
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Bitmap bitmap = CaptureScreen();
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bitmap.Save(fileName, format);
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}
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}
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}
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