Issue Sending byte from C to java

[grapesan]

I am sending integer from c to java .
In C , integer is 24565. I converted it to 4 bytes. Its byte conversion is
First Byte: -11
Second Byte: 95
Third Byte: 0
Fourth Byte: 0.

My C code is
char content_size_ch ars[4];
int content_size=24 565;

// Convert output length to bytes
content_size_ch ars[0] = content_size & 0xFF;
content_size_ch ars[1] = (content_size & 0xFF00) >> 8;
content_size_ch ars[2] = (content_size & 0xFF0000) >> 16;
content_size_ch ars[3] = (content_size & 0xFF000000) >> 24;

// write byte array to stderr stream
fprintf(stderr, "%d",content_si ze_chars[0] );
fprintf(stderr, "%d",content_si ze_chars[1] );
fprintf(stderr, "%d",content_si ze_chars[2] );
fprintf(stderr, "%d",content_si ze_chars[3] );
fflush(stderr);


In java, bytes read using datainputstream are

byte []lengthBytes=new byte[4];
lengthBytes[0]=dataInStream.r eadByte();
lengthBytes[1]=dataInStream.r eadByte();
lengthBytes[2]=dataInStream.r eadByte();
lengthBytes[3]=dataInStream.r eadByte();

Output is :
First byte: -
Second Byte: 1
Third Byte: 1
Fourth Byte: 9


How to send integer from C to java ?

Thanks

[johny10151981]

What is that mean sending data from c to java?

[grapesan]

C is executed in separate process using Runtime.exec(). C writes data on stdout and stderr. Data should be send as header + data. Header is 4 byte length of data. So Java is reading stdout and stderr of the C process.

[donbock]

Try writing the integer as text. That is, 24565 comes out as "24565". Then Java can read the text.

[grapesan]

Thanks. That works fine but commuincation between java and c is continuous. I mean C sends data as header(length of data) + data + header (length of data)+ ............ So header tells how much to read as data. For this we should know size of header which we decided as 4 bytes.

[donbock]

OK, wrap a header around the text representation of the number.