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::Ret LiveImg()
{
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::Ret LiveImg()
{
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,

*************** **************W RAPPER********* *************** *************** *
class ImageWrapper
{
Library library =null;
Function function =null;

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

}


public PrimitiveArray RetLiveImg(Stri ng fn_name)
{
function=librar y.getFunction(f n_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("n ewdll");

function="?RetL iveImg@NewDemoD ll@NewDll@@SAEX Z";

PrimitiveArray array=sdk.RetLi veImg(function) ;

byte[] buffer= array.getBytes( );
FileOutputStrea m out=new FileOutputStrea m("liveimage.jp g");
out.write(buffe r);
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_ACCES S_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?