How to read the byte arry data?

[krishnasamy]

Hi,

I have invoking the "NewDll.Dll" which created using vc++. In this Dll a method return the array data following way,

BYTE NewDemoDll::RetLiveImg()
{
return bufferData[ImageSize];
}

How can I write the code in Java to get the data from the above method?

Please help me to solve this problem.

[r035198x]

Hi,

I have invoking the "NewDll.Dll" which created using vc++. In this Dll a method return the array data following way,

BYTE NewDemoDll::RetLiveImg()
{
return bufferData[ImageSize];
}

How can I write the code in Java to get the data from the above method?

Please help me to solve this problem.

Try JNI

[krishnasamy]

Try JNI

Thanks for your reply.

I already tried to JNI wrapper. Here I given that code,

*****************************WRAPPER************** **************************
class ImageWrapper
{
Library library =null;
Function function =null;

PowerShot(String libname)
{
library = new Library(libname);
library.load();

}


public PrimitiveArray RetLiveImg(String fn_name)
{
function=library.getFunction(fn_name);
PrimitiveArray data = new PrimitiveArray(UInt8.class, 20480);
function.invoke(data);
return data;
}


public static void main(String args[])throws IOException
{

ImageWrapper wrap=new ImageWrapper("newdll");

function="?RetLiveImg@NewDemoDll@NewDll@@SAEXZ";

PrimitiveArray array=sdk.RetLiveImg(function);

byte[] buffer= array.getBytes();
FileOutputStream out=new FileOutputStream("liveimage.jpg");
out.write(buffer);
out.close();


}
}

When I compile above program, I got the following error,

*********************************ERROR ***************************************

D:>java ImageWrapper

#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d316eb0, pid=1416, tid=2440
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0_12-b04 mixed mode, sharing)
# Problematic frame:
# C [java.dll+0x6eb0]
#
# An error report file with more information is saved as hs_err_pid1416.log


Shall you give a example to read the Binary Data from DLL?