Passing bytearray by ref in C#

Question

The input that i have is a byte array containing bytes of an image

e.g.

byte[] byteData;
string fileName = @"C:\pic3.jp2";
FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
long numBytes = new FileInfo(fileName).Length;
byteData = br.ReadBytes((int)numBytes);

Now i have a control named j2k

and i want to use its function

j2k.OpenMemory() in order to get converted image in jp2 format

its parameters are

openmemory(ref byte src_byte,int src_length)

Now i have a byte array and the function wants me to send it a byte. How can i convert a bytearray into ref byte. I have tried using first element of byte array it got compiled but returned error in executing that line.

Crish · Answer

Hi You can use also following code for Passing bytearray by ref in C#.you can refer this. byte [] tmpArray = new byte [10]; for ( int i = 0; i byte )i; } Array ar = tmpArray; myactivexControl.test2( ref ar);

Suthish Nair · Answer

refer article

Hassan farrukh · Answer

Thanks a lot for your reply shankey Actually my problem is string fileName = "rgb.jp2" ; FileStream fs = new FileStream (fileName, FileMode .Open, FileAccess .Read); BinaryReader br = new BinaryReader (fs); long numBytes = new FileInfo (fileName).Length; byteData = br.ReadBytes(( int )numBytes); /// Now byteData contains image bytes info //now if i use codec.OpenFile( "rgb.jp2" ); /// Shows a file in control codec /// //// but i want to do it by using memory as i am using all this in a live stream /// i cant write all this in a file becuase it will consume time //codec.OpenMemory is the function that will do it but i am unable to pass parameters in it // It requires parametersvoid codec.OpenMemory (ref byte src_buff, int src_buff) // While i only have a bytearray named byteData which holds bytes containing image info. I cant pass byte array as a reference i can only pass a single byte I have also uploaded the source code.

Shankey · Answer

hi Hassan, I tried the following code and by default the byte array is passed by reference you can try following code. namespace byteArray { class Program { static void Main(string[] args) { byte[] byteData; string fileName = @"C:\pic3.jpeg"; FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); BinaryReader br = new BinaryReader(fs); long numBytes = new FileInfo(fileName).Length; byteData = br.ReadBytes((int)numBytes); openMemory(byteData); for (int i = 0; i { Console.WriteLine("{0}:{1}", i, byteData[i]); } } private static void openMemory(byte[] b) { for (int i = 0; i { Console.WriteLine("{0}:{1}", i, b[i]); b[i]++; } } } } And if i am not able to understand your problem clearly then plz provide some more details like the prototype of the openmemory function...

Passing bytearray by ref in C#

Answers (4)