主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序
1package com.qiu.util;
2import java.io.*;
3import java.net.*;
4import javax.swing.*;
5import java.awt.*;
6import java.awt.event.*;
7import java.awt.image.*;
8import javax.imageio.*;
9import java.io.*;
10
11
12
13/**@Author Qiu_BaiChao
14 *一个简单的屏幕抓图
15 *
16 **/
17
18public class ScreenCapture {
19 //test main
20 public static void main(String[] args) throws Exception{
21 String userdir = System.getProperty("user.dir");
22 File tempFile = new File("d:","temp.png");
23 ScreenCapture capture = ScreenCapture.getInstance();
24 capture.captureImage();
25 JFrame frame = new JFrame();
26 JPanel panel = new JPanel();
27 panel.setLayout(new BorderLayout());
28 JLabel imagebox = new JLabel();
29 panel.add(BorderLayout.CENTER,imagebox);
30 imagebox.setIcon(capture.getPickedIcon());
31 capture.saveToFile(tempFile);
32 capture.captureImage();
33 imagebox.setIcon(capture.getPickedIcon());
34 frame.setContentPane(panel);
35 frame.setSize(400,300);
36 frame.show();
37 System.out.println("Over");
38 }
39
40 private ScreenCapture() {
41
42 try{
43 robot = new Robot();
44 }
45 catch(AWTException e) {
46 System.err.println("Internal Error: " + e);
47 e.printStackTrace();
48 }
49 JPanel cp = (JPanel)dialog.getContentPane();
50 cp.setLayout(new BorderLayout());
51 labFullScreenImage.addMouseListener(new MouseAdapter() {
52 public void mouseReleased(MouseEvent evn) {
53 isFirstPoint = true;
54 pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);
55 dialog.setVisible(false);
56 }
57 });
58
59 labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
60 public void mouseDragged(MouseEvent evn) {
61 if(isFirstPoint) {
62 x1 = evn.getX();
63 y1 = evn.getY();
64 isFirstPoint = false;
65 }
66 else {
67 x2 = evn.getX();
68 y2 = evn.getY();
69 int maxX = Math.max(x1,x2);
70 int maxY = Math.max(y1,y2);
71 int minX = Math.min(x1,x2);
72 int minY = Math.min(y1,y2);
73 recX = minX;
74 recY = minY;
75 recW = maxX-minX;
76 recH = maxY-minY;
77 labFullScreenImage.drawRectangle(recX,recY,recW,recH);
78 }
79 }
80
81 public void mouseMoved(MouseEvent e) {
82 labFullScreenImage.drawCross(e.getX(),e.getY());
83 }
84 });
85
86 cp.add(BorderLayout.CENTER,labFullScreenImage);
87 dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
88 dialog.setAlwaysOnTop(true);
89 dialog.setMaximumSize(
90 Toolkit.getDefaultToolkit().getScreenSize());
91 dialog.setUndecorated(true);
92 dialog.setSize(dialog.getMaximumSize());
93 dialog.setModal(true);
94 }
95 //Singleton Pattern
96 public static ScreenCapture getInstance() {
97 return defaultCapturer;
98 }
99 /**捕捉全屏慕*/
100 public Icon captureFullScreen() {
101 fullScreenImage = robot.createScreenCapture(new Rectangle(
102 Toolkit.getDefaultToolkit().getScreenSize()));
103 ImageIcon icon = new ImageIcon(fullScreenImage);
104 return icon;
105 }
106 /**捕捉屏幕的一个矫形区域
107 */
108 public void captureImage() {
109 fullScreenImage = robot.createScreenCapture(new Rectangle(
110 Toolkit.getDefaultToolkit().getScreenSize()));
111 ImageIcon icon = new ImageIcon(fullScreenImage);
112 labFullScreenImage.setIcon(icon);
113 dialog.setVisible(true);
114 }
115 /**得到捕捉后的BufferedImage*/
116 public BufferedImage getPickedImage() {
117 return pickedImage;
118 }
119 /**得到捕捉后的Icon*/
120 public ImageIcon getPickedIcon() {
121 return new ImageIcon(getPickedImage());
122 }
123 /**储存为一个文件,为PNG格式
124 *@deprecated
125 *replaced by saveAsPNG(File file)
126 **/
127 @Deprecated
128 public void saveToFile(File file) throws IOException{
129 ImageIO.write(getPickedImage(),defaultImageFormater,file);
130 }
131 /**储存为一个文件,为PNG格式*/
132 public void saveAsPNG(File file) throws IOException {
133 ImageIO.write(getPickedImage(),"png",file);
134 }
135 /**储存为一个JPEG格式图像文件*/
136 public void saveAsJPEG(File file) throws IOException {
137 ImageIO.write(getPickedImage(),"JPEG",file);
138 }
139
140 /**写入一个OutputStream*/
141 public void write(OutputStream out) throws IOException{
142 ImageIO.write(getPickedImage(),defaultImageFormater,out);
143 }
144
145 //singleton design pattern
146 private static ScreenCapture defaultCapturer = new ScreenCapture();
147 private int x1,y1,x2,y2;
148 private int recX,recY,recH,recW; //截取的图像
149 private boolean isFirstPoint = true;
150 private BackgroundImage labFullScreenImage = new BackgroundImage();
151 private Robot robot;
152 private BufferedImage fullScreenImage;
153 private BufferedImage pickedImage;
154 private String defaultImageFormater = "png";
155 private JDialog dialog = new JDialog();
156}
157
158
159
160/**显示图片的Label*/
161class BackgroundImage extends JLabel{
162 public void paintComponent(Graphics g) {
163 super.paintComponent(g);
164 g.drawRect(x,y,w,h);
165 String area = Integer.toString(w)+" * "+ Integer.toString(h);
166 g.drawString(area,x+(int)w/2-15,y+(int)h/2);
167 g.drawLine(lineX,0,lineX,getHeight());
168 g.drawLine(0,lineY,getWidth(),lineY);
169 }
170
171 public void drawRectangle(int x,int y,int width,int height) {
172 this.x = x;
173 this.y = y;
174 h = height;
175 w = width;
176 repaint();
177 }
178
179 public void drawCross(int x,int y) {
180 lineX = x;
181 lineY = y;
182 repaint();
183 }
184
185 int lineX,lineY;
186 int x,y,h,w;
187}
188
189
2import java.io.*;
3import java.net.*;
4import javax.swing.*;
5import java.awt.*;
6import java.awt.event.*;
7import java.awt.image.*;
8import javax.imageio.*;
9import java.io.*;
10
11
12
13/**@Author Qiu_BaiChao
14 *一个简单的屏幕抓图
15 *
16 **/
17
18public class ScreenCapture {
19 //test main
20 public static void main(String[] args) throws Exception{
21 String userdir = System.getProperty("user.dir");
22 File tempFile = new File("d:","temp.png");
23 ScreenCapture capture = ScreenCapture.getInstance();
24 capture.captureImage();
25 JFrame frame = new JFrame();
26 JPanel panel = new JPanel();
27 panel.setLayout(new BorderLayout());
28 JLabel imagebox = new JLabel();
29 panel.add(BorderLayout.CENTER,imagebox);
30 imagebox.setIcon(capture.getPickedIcon());
31 capture.saveToFile(tempFile);
32 capture.captureImage();
33 imagebox.setIcon(capture.getPickedIcon());
34 frame.setContentPane(panel);
35 frame.setSize(400,300);
36 frame.show();
37 System.out.println("Over");
38 }
39
40 private ScreenCapture() {
41
42 try{
43 robot = new Robot();
44 }
45 catch(AWTException e) {
46 System.err.println("Internal Error: " + e);
47 e.printStackTrace();
48 }
49 JPanel cp = (JPanel)dialog.getContentPane();
50 cp.setLayout(new BorderLayout());
51 labFullScreenImage.addMouseListener(new MouseAdapter() {
52 public void mouseReleased(MouseEvent evn) {
53 isFirstPoint = true;
54 pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);
55 dialog.setVisible(false);
56 }
57 });
58
59 labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
60 public void mouseDragged(MouseEvent evn) {
61 if(isFirstPoint) {
62 x1 = evn.getX();
63 y1 = evn.getY();
64 isFirstPoint = false;
65 }
66 else {
67 x2 = evn.getX();
68 y2 = evn.getY();
69 int maxX = Math.max(x1,x2);
70 int maxY = Math.max(y1,y2);
71 int minX = Math.min(x1,x2);
72 int minY = Math.min(y1,y2);
73 recX = minX;
74 recY = minY;
75 recW = maxX-minX;
76 recH = maxY-minY;
77 labFullScreenImage.drawRectangle(recX,recY,recW,recH);
78 }
79 }
80
81 public void mouseMoved(MouseEvent e) {
82 labFullScreenImage.drawCross(e.getX(),e.getY());
83 }
84 });
85
86 cp.add(BorderLayout.CENTER,labFullScreenImage);
87 dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
88 dialog.setAlwaysOnTop(true);
89 dialog.setMaximumSize(
90 Toolkit.getDefaultToolkit().getScreenSize());
91 dialog.setUndecorated(true);
92 dialog.setSize(dialog.getMaximumSize());
93 dialog.setModal(true);
94 }
95 //Singleton Pattern
96 public static ScreenCapture getInstance() {
97 return defaultCapturer;
98 }
99 /**捕捉全屏慕*/
100 public Icon captureFullScreen() {
101 fullScreenImage = robot.createScreenCapture(new Rectangle(
102 Toolkit.getDefaultToolkit().getScreenSize()));
103 ImageIcon icon = new ImageIcon(fullScreenImage);
104 return icon;
105 }
106 /**捕捉屏幕的一个矫形区域
107 */
108 public void captureImage() {
109 fullScreenImage = robot.createScreenCapture(new Rectangle(
110 Toolkit.getDefaultToolkit().getScreenSize()));
111 ImageIcon icon = new ImageIcon(fullScreenImage);
112 labFullScreenImage.setIcon(icon);
113 dialog.setVisible(true);
114 }
115 /**得到捕捉后的BufferedImage*/
116 public BufferedImage getPickedImage() {
117 return pickedImage;
118 }
119 /**得到捕捉后的Icon*/
120 public ImageIcon getPickedIcon() {
121 return new ImageIcon(getPickedImage());
122 }
123 /**储存为一个文件,为PNG格式
124 *@deprecated
125 *replaced by saveAsPNG(File file)
126 **/
127 @Deprecated
128 public void saveToFile(File file) throws IOException{
129 ImageIO.write(getPickedImage(),defaultImageFormater,file);
130 }
131 /**储存为一个文件,为PNG格式*/
132 public void saveAsPNG(File file) throws IOException {
133 ImageIO.write(getPickedImage(),"png",file);
134 }
135 /**储存为一个JPEG格式图像文件*/
136 public void saveAsJPEG(File file) throws IOException {
137 ImageIO.write(getPickedImage(),"JPEG",file);
138 }
139
140 /**写入一个OutputStream*/
141 public void write(OutputStream out) throws IOException{
142 ImageIO.write(getPickedImage(),defaultImageFormater,out);
143 }
144
145 //singleton design pattern
146 private static ScreenCapture defaultCapturer = new ScreenCapture();
147 private int x1,y1,x2,y2;
148 private int recX,recY,recH,recW; //截取的图像
149 private boolean isFirstPoint = true;
150 private BackgroundImage labFullScreenImage = new BackgroundImage();
151 private Robot robot;
152 private BufferedImage fullScreenImage;
153 private BufferedImage pickedImage;
154 private String defaultImageFormater = "png";
155 private JDialog dialog = new JDialog();
156}
157
158
159
160/**显示图片的Label*/
161class BackgroundImage extends JLabel{
162 public void paintComponent(Graphics g) {
163 super.paintComponent(g);
164 g.drawRect(x,y,w,h);
165 String area = Integer.toString(w)+" * "+ Integer.toString(h);
166 g.drawString(area,x+(int)w/2-15,y+(int)h/2);
167 g.drawLine(lineX,0,lineX,getHeight());
168 g.drawLine(0,lineY,getWidth(),lineY);
169 }
170
171 public void drawRectangle(int x,int y,int width,int height) {
172 this.x = x;
173 this.y = y;
174 h = height;
175 w = width;
176 repaint();
177 }
178
179 public void drawCross(int x,int y) {
180 lineX = x;
181 lineY = y;
182 repaint();
183 }
184
185 int lineX,lineY;
186 int x,y,h,w;
187}
188
189
那么,然后我们来做一个C#实现的截屏,注意,调用完全是MS的API:
用ScreenCapture这个类特别简单,该类有四个方法:
public Image CaptureScreen()
捕获整个屏幕的图象public Image CaptureWindow(IntPtr handle)
捕获窗口上的图象public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
捕获窗口图像并且保存为一个文件public void CaptureScreenToFile(string filename, ImageFormat format)
捕获整个屏幕的图像并且保存为一个文件
1using System;
2using System.Runtime.InteropServices;
3using System.Drawing;
4using System.Drawing.Imaging;
5
6namespace ScreenShotDemo
7{
8 /// <summary>
9 /// 提供捕获全屏或者一个不规则窗口函数,并保存。
10 /// </summary>
11 public class ScreenCapture
12 {
13 /// <summary>
14 /// Creates an Image object containing a screen shot of the entire desktop?
15 /// </summary>
16 /// <returns></returns>
17 public Image CaptureScreen()
18 {
19 return CaptureWindow( User32.GetDesktopWindow() );
20 }
21
22 /// <summary>
23 /// Creates an Image object containing a screen shot of a specific window?
24 /// </summary>
25 /// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
26 /// <returns></returns>
27 public Image CaptureWindow(IntPtr handle)
28 {
29 // get te hDC of the target window
30 IntPtr hdcSrc = User32.GetWindowDC(handle);
31 // get the size
32 User32.RECT windowRect = new User32.RECT();
33 User32.GetWindowRect(handle,ref windowRect);
34 int width = windowRect.right - windowRect.left;
35 int height = windowRect.bottom - windowRect.top;
36 // create a device context we can copy to
37 IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
38 // create a bitmap we can copy it to,
39 // using GetDeviceCaps to get the width/height
40 IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);
41 // select the bitmap object
42 IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);
43 // bitblt over
44 GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);
45 // restore selection
46 GDI32.SelectObject(hdcDest,hOld);
47 // clean up
48 GDI32.DeleteDC(hdcDest);
49 User32.ReleaseDC(handle,hdcSrc);
50
51 // get a .NET image object for it
52 Image img = Image.FromHbitmap(hBitmap);
53 // free up the Bitmap object
54 GDI32.DeleteObject(hBitmap);
55
56 return img;
57 }
58
59 /// <summary>
60 /// Captures a screen shot of a specific window, and saves it to a file?
61 /// </summary>
62 /// <param name="handle"></param>
63 /// <param name="filename"></param>
64 /// <param name="format"></param>
65 public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
66 {
67 Image img = CaptureWindow(handle);
68 img.Save(filename,format);
69 }
70
71 /// <summary>
72 /// Captures a screen shot of the entire desktop, and saves it to a file?
73 /// </summary>
74 /// <param name="filename"></param>
75 /// <param name="format"></param>
76 public void CaptureScreenToFile(string filename, ImageFormat format)
77 {
78 Image img = CaptureScreen();
79 img.Save(filename,format);
80 }
81
82 /// <summary>
83 /// Helper class containing Gdi32 API functions
84 /// </summary>
85 private class GDI32
86 {
87
88 public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
89
90 [DllImport("gdi32.dll")]
91 public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,
92 int nWidth,int nHeight,IntPtr hObjectSource,
93 int nXSrc,int nYSrc,int dwRop);
94 [DllImport("gdi32.dll")]
95 public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,
96 int nHeight);
97 [DllImport("gdi32.dll")]
98 public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
99 [DllImport("gdi32.dll")]
100 public static extern bool DeleteDC(IntPtr hDC);
101 [DllImport("gdi32.dll")]
102 public static extern bool DeleteObject(IntPtr hObject);
103 [DllImport("gdi32.dll")]
104 public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);
105 }
106
107 /// <summary>
108 /// Helper class containing User32 API functions
109 /// </summary>
110 private class User32
111 {
112 [StructLayout(LayoutKind.Sequential)]
113 public struct RECT
114 {
115 public int left;
116 public int top;
117 public int right;
118 public int bottom;
119 }
120
121 [DllImport("user32.dll")]
122 public static extern IntPtr GetDesktopWindow();
123 [DllImport("user32.dll")]
124 public static extern IntPtr GetWindowDC(IntPtr hWnd);
125 [DllImport("user32.dll")]
126 public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);
127 [DllImport("user32.dll")]
128 public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);
129
130 }
131
132
133 }
134}
135
136
本文很多源代码来自http://www.planet-source-code.com/
提供很多不错的Source。