Hi list
I been developing of JAVA SERVER. I'm using
java.awt.Robot class to capture the screen image ..
But i'm getting few problem . Following is a simple
Frame Java program to capture the screen .
The problem is well stated in the program .. I'll be
very much glad if anyone can solve the
problem or give me a alternative for this problem...
Thx
Raj
I have used win2k and jdk1.3
-----------------------------------screencapture.java---------------------------------------
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.awt.Robot;
public class capturescreen2 extends JFrame
{
BufferedImage img = null;
Robot r = null;
Toolkit ct = null;
public capturescreen2()
{
getContentPane().setLayout(null);
r = new Robot();
ct = Toolkit.getDefaultToolkit();
}
JButton button = new JButton("Capture");
button.setBounds(10,10,100,25);
button.addActionListener
(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
/************************************READ ME
********************************
the main problem is with BufferedImage img =
r.createScreenCapture(new Rectangle(x,y,w,h));
But if u write this then compiler gives a
error as to the comversion is not
appropriate i.e. you have to convert a Image "
r.createScreenCapture(new Rectangle(x,y,w,h))"
into BufferedImage "img".
there are two soluction for this
1. Explicit casting
BufferedImage img =
(BufferedImage)r.createScreenCapture(new
Rectangle(x,y,w,h));
it gives
-------------error--------------
#
# HotSpot Virtual Machine Error,
EXCEPTION_ACCESS_VIOLATION
#
# Error ID: 4F533F57494E13120E43505002B0
#
--------------------------------
2.To cast it with constructor
BufferedImage(width,height,imagetype)
for this i been using a tempimg ( a obj of Image) and
then creating the 'img' obj using this
constructor.
again the problem is that according to java1.3 help
doc the predefined image types:
TYPE_BYTE_BINARY or TYPE_BYTE_INDEXED to get this we
can use getType(). i have assumed imagetype
= 2 . This time it runs but with nothing to show
inside the frame :(
***********************************READ ME
********************************/
// this is 1 option
img = (BufferedImage) r.createScreenCapture(x,y,w,h);
/* this is 2nd option
Image tempimg = null;
tempimg = r.createScreenCapture(x,y,w,h);
*******> tempimp.getType() = 2 ( or 1 ) but not 0
assume;
img = new BufferedImage(w-x,h-y,2);
*/
repaint();
}
}
);
getContentPane().add(button);
addWindowListener(new WindowAdapter() { public void
windowClosing(WindowEvent e) {
System.exit(0);} });
}
public void paint(Graphics g)
{
super.paint(g);
if (img != null)
g.drawImage(img,10,70,(int)ct.getScreenSize().getWidth(),(int)ct.getScreenSize().getHeight(),this
);
}
public static void main(String argv[])
{
capturescreen2 frame = new capturescreen2();
frame.setBounds(50,50,300,300);
frame.setVisible(true);
}
}
-----------------------------------------end
screencapture.java--------------------------------
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