截取桌面图像,调用Graphics的CopyFromScreen方法可以实现
操作代码:
Graphics gSrc = this.CreateGraphics(); //创建窗体的Graphics对象
HandleRef hDcSrc = new HandleRef(null, gSrc.GetHdc());
int width = this.Width-SystemInformation.FrameBorderSize.Width; //获取宽度
int height = this.Height-SystemInformation.FrameBorderSize.Height; //获取高度
const int SRCCOPY = 0xcc0020; //复制图块的光栅操作码
Bitmap bmSave = new Bitmap(width, height); //用于保存图片的位图对象
Graphics gSave = Graphics.FromImage(bmSave); //创建该位图的Graphics对象
HandleRef hDcSave = new HandleRef(null, gSave.GetHdc()); //得到句柄
BitBlt(hDcSave, 0, 0, width, height, hDcSrc, 0, 0, SRCCOPY);
如此操作,当前窗体的图像即被保存之bmSave中。
详细的代码:- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Data;
- using System.Drawing;
- using System.Text;
- using System.Windows.Forms;
- using System.Runtime.InteropServices;
-
- namespace ScreenShot
- {
- public partial class Form1 : Form
- {
- public Form1()
- {
- InitializeComponent();
- }
-
- private void btnScreen_Click(object sender, EventArgs e)
- {
- int screenWidth = System.Windows.Forms.SystemInformation.VirtualScreen.Width; //屏幕宽度
- int screenHeight = System.Windows.Forms.SystemInformation.VirtualScreen.Height; //屏幕高度
-
- Bitmap bmSave = new Bitmap(screenWidth, screenHeight);
- Graphics g = Graphics.FromImage(bmSave);
-
- g.CopyFromScreen(0, 0, 0, 0, new Size(screenWidth, screenHeight), CopyPixelOperation.SourceCopy);
- g.Dispose();
-
- SaveFile(bmSave);
- }
-
- private void btnWindow_Click(object sender, EventArgs e)
- {
- Graphics gSrc = this.CreateGraphics(); //创建窗体的Graphics对象
- HandleRef hDcSrc = new HandleRef(null, gSrc.GetHdc());
-
- int width = this.Width-SystemInformation.FrameBorderSize.Width; //获取宽度
- int height = this.Height-SystemInformation.FrameBorderSize.Height; //获取高度
-
- const int SRCCOPY = 0xcc0020; //复制图块的光栅操作码
-
- Bitmap bmSave = new Bitmap(width, height); //用于保存图片的位图对象
- Graphics gSave = Graphics.FromImage(bmSave); //创建该位图的Graphics对象
- HandleRef hDcSave = new HandleRef(null, gSave.GetHdc()); //得到句柄
-
- BitBlt(hDcSave, 0, 0, width, height, hDcSrc, 0, 0, SRCCOPY);
-
- gSrc.ReleaseHdc();
- gSave.ReleaseHdc();
-
- gSrc.Dispose();
- gSave.Dispose();
-
- SaveFile(bmSave);
- }
- private void SaveFile(Bitmap bmSave)
- {
- if (DialogResult.OK == saveFileDialog1.ShowDialog())
- {
- string fileName = saveFileDialog1.FileName;
- if (1 == saveFileDialog1.FilterIndex)
- {
- if (!fileName.EndsWith(".bmp"))
- {
- fileName += ".bmp";
- }
- }
- else if (2 == saveFileDialog1.FilterIndex)
- {
- if (!fileName.EndsWith(".jpg"))
- {
- fileName += ".jpg";
- }
- }
- else if (3 == saveFileDialog1.FilterIndex)
- {
- if (!fileName.EndsWith(".png"))
- {
- fileName += ".png";
- }
- }
- Save(bmSave, fileName);
- }
- }
- private void Save(Bitmap bm,string fileName)
- {
- if (fileName.EndsWith(".bmp"))
- {
- bm.Save(fileName, System.Drawing.Imaging.ImageFormat.Bmp);
- }
- else if (fileName.EndsWith(".jpg"))
- {
- bm.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);
- }
- else if (fileName.EndsWith(".png"))
- {
- bm.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
- }
- bm.Dispose();
- }
-
- [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
- public static extern int BitBlt(HandleRef hDC, int x, int y, int nWidth, int nHeight, HandleRef hSrcDC, int xSrc, int ySrc, int dwRop);
- }
- }
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