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-(void)sendImageMessage:(GLubyte *)pixels

{

   Byte * content;

    NSData *Graydata = [NSDatadataWithBytes:pixels length:76800];

    NSData *data01 = [NSDatadataWithBytes:content length:3];

   Byte *testByte = (Byte *)[data01bytes];

    testByte[0] = [Graydatalength]/65536;

    testByte[1] = [Graydatalength]%65536/256;

    testByte[2] = [Graydatalength]%65536%256;

    NSMutableData *_mutabledata = [NSMutableDataalloc];

    [_mutabledataappendData:data01];

    [_mutabledataappendData:Graydata];

   NSLog(@"writeData:%i",[_mutabledatalength]);

    //sendmessage

    [client writeData:_mutabledata withTimeout:-1tag:0];

    [_mutabledatarelease];

}