Collect input stream as jpg file.

[Boki]

Hi All,
My last step, collect the input steam ( data ) to a jpg file,
could you please help to finish it ? thank you very much!

//--------------------
....
public InputStream in;
private StreamConnection con = null;
in = con.openInputStream();
....
//------------------
....
// collect input data to jpg file


try{

int bytesToRead = in.available();
if (bytesToRead > 0) {
// Initialize buffer
byte[] byteBuffer = new byte[bytesToRead];
// Read bytes
int nbrOfBytesRead = in.read(byteBuffer);
String str = new String(byteBuffer);
}
}
------------------

 

[Boki]

For this line:
in.read(byteBuffer);

It seems that the everytime I got data of inputStream, the in.read(xxx) will
overwrite my array data, and it seems that I can't use pointer
byteBuffer[pData++], right?

Could you please help?
Thank you very much!

Best regards,
Boki.

 

[Boki]

any better way ?
--------------
try{
int count_jpg=0;
int bytesToRead = in.available();
if (bytesToRead > 0) {
// Initialize buffer
byte[] byteBuffer = new byte[bytesToRead];
// Read bytes
int nbrOfBytesRead = in.read(byteBuffer);

GUI.ggg+=bytesToRead;
gui.repaint();

for (count_jpg=0;count_jpg<bytesToRead;count_jpg++)
imageData[GUI.ggg+count_jpg]=byteBuffer[count_jpg];
}
}

For this line:
in.read(byteBuffer);

It seems that the everytime I got data of inputStream, the in.read(xxx)
will overwrite my array data, and it seems that I can't use pointer
byteBuffer[pData++], right?

Could you please help?
Thank you very much!

Best regards,
Boki.

Hi All,
My last step, collect the input steam ( data ) to a jpg file,
could you please help to finish it ? thank you very much!

//--------------------
...
public InputStream in;
private StreamConnection con = null;
in = con.openInputStream();
...
//------------------
...
// collect input data to jpg file


try{

int bytesToRead = in.available();
if (bytesToRead > 0) {
// Initialize buffer
byte[] byteBuffer = new byte[bytesToRead];
// Read bytes
int nbrOfBytesRead = in.read(byteBuffer);
String str = new String(byteBuffer);
}
}

 

[Boki]

whatever, I have done the protype, I am trying the performance

btw, how to capture the webcam jpg data on PC ??

do I have to consider USB driver ?

or How can I get the JPG image directly?

Thank you very mcuh!



Best regards,
Boki.

any better way ?
--------------
try{
int count_jpg=0;
int bytesToRead = in.available();
if (bytesToRead > 0) {
// Initialize buffer
byte[] byteBuffer = new byte[bytesToRead];
// Read bytes
int nbrOfBytesRead = in.read(byteBuffer);

GUI.ggg+=bytesToRead;
gui.repaint();

for (count_jpg=0;count_jpg<bytesToRead;count_jpg++)
imageData[GUI.ggg+count_jpg]=byteBuffer[count_jpg];
}
}

For this line:
in.read(byteBuffer);

It seems that the everytime I got data of inputStream, the in.read(xxx)
will overwrite my array data, and it seems that I can't use pointer
byteBuffer[pData++], right?

Could you please help?
Thank you very much!

Best regards,
Boki.

Hi All,
My last step, collect the input steam ( data ) to a jpg file,
could you please help to finish it ? thank you very much!

//--------------------
...
public InputStream in;
private StreamConnection con = null;
in = con.openInputStream();
...
//------------------
...
// collect input data to jpg file


try{

int bytesToRead = in.available();
if (bytesToRead > 0) {
// Initialize buffer
byte[] byteBuffer = new byte[bytesToRead];
// Read bytes
int nbrOfBytesRead = in.read(byteBuffer);
String str = new String(byteBuffer);
}
}

 

[Roedy Green]

String str = new String(byteBuffer);

You don't want a string. This has nothing to do with human-readable
text. Have a look at the ImageIO class.

see http://mindprod.com/jgloss/imageio.html

It will let you read from a file on an InputStream.

If you have to make this work on an old JVM you can do it with:

Image image = toolkit.createImage( rawImage );

 

[Roedy Green]

It seems that the everytime I got data of inputStream, the in.read(xxx) will
overwrite my array data, and it seems that I can't use pointer
byteBuffer[pData++], right?

see http://mindprod.com/jgloss/readblocking.html
for how to do that. However, you don't need to. ImageIO will do it for
you.

 

[Roedy Green]

btw, how to capture the webcam jpg data on PC ??

import javax.imageio.ImageIO;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.ControllerAdapter;
import javax.media.ControllerClosedEvent;
import javax.media.ControllerListener;
import javax.media.Format;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.RealizeCompleteEvent;
import javax.media.StartEvent;
import javax.media.StopEvent;
import javax.media.control.FormatControl;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.RGBFormat;
import javax.media.format.VideoFormat;
import javax.media.format.YUVFormat;
import javax.media.util.BufferToImage;

I would tackle something easier for now.

 

[Boki]

Dear Green,
any example ?

Best regards,
Boki.

import javax.imageio.ImageIO;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.ControllerAdapter;
import javax.media.ControllerClosedEvent;
import javax.media.ControllerListener;
import javax.media.Format;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.RealizeCompleteEvent;
import javax.media.StartEvent;
import javax.media.StopEvent;
import javax.media.control.FormatControl;
import javax.media.control.FrameGrabbingControl;
import javax.media.format.RGBFormat;
import javax.media.format.VideoFormat;
import javax.media.format.YUVFormat;
import javax.media.util.BufferToImage;

I would tackle something easier for now.

 

[Boki]

This is a good example, does it possible to receive unknow length, and auto
stop when time out?

I can't image that code stop running ~~ @@ ( that makes me can't implement
time out when I polling data... )

It seems that the everytime I got data of inputStream, the in.read(xxx)
will
overwrite my array data, and it seems that I can't use pointer
byteBuffer[pData++], right?

see http://mindprod.com/jgloss/readblocking.html
for how to do that. However, you don't need to. ImageIO will do it for
you.

 

[Boki]

You are right, I don't need that.

I don't know J2ME can use imageIO or not, I will try tomorrow thanks a
lot.

 

[Roedy Green]

Dear Green,
any example ?

Sorry,. I am not up for it. It is very tricky.

 

[Roedy Green]

This is a good example, does it possible to receive unknow length, and auto
stop when time out?

that would give you random crap and be infuriatingly slow.

For sockets you put a length on the front.

For HTTP, if it won't give you a length, see
http://mindprod.com/jgloss/readblocking.html
http://mindprod.com/jgloss/readeverything.html
http://mindprod.com/applets/fileio.html (HTTP GET)

 

[Roedy Green]

I don't know J2ME can use imageIO or not, I will try tomorrow thanks a
lot.

It will need some sort of method for taking a JPG image as a stream
of a byte[].
You know how to convert byte[] to stream and back, right? If not see
http://mindprod.com/applets/fileio.html