IBM XMS .Net how do I receive images files like png and jpg from the MQ

Question

I have a .net XMS client to receive messages from the MQ. It can receive text files fine. But the problem starts when I try to receive .zip or png files. The problem is that the file saved is corrupted and always intreprets it as textmessage.

            var filename = "test.png";
            else if (message is IBytesMessage)
            {
               IBytesMessage bytesMessage = (IBytesMessage)message;
               var messageLength = bytesMessage.ReadInt();
               byte[] uploadPayload = new byte[messageLength];
               bytesMessage.ReadBytes(uploadPayload, messageLength);

               var filePath = _fileUtil.SaveBytesFile(fileName, uploadPayload);
               return filePath;
            }
            if (message is ITextMessage)
            {
                var msg = (ITextMessage)message;
                var result = msg.Text;
                var plainTextBytes = Encoding.UTF8.GetBytes(result);
                var filePath = _fileUtil.SaveBytesFile(fileName, plainTextBytes);
                return filePath;

            }

The msg.Text removes the characerters.
I opened the original png file in notepad++ and find the characters, for example below


O-humMkkVøgÆUf¯éÙô

I tried also copying the text and pasting the text in an new file corrupts the file. Am I missing something... gets translated to


O-humMkkV?g?Uf????

Anyway to read it with the missing characters

Since images are binary, I wouln't the open file in an application like Notepad that can understand only text. Try viewing in a hex editor like Notepad++. — Shashi, Sep 28 '21 at 08:31
hi Sashi, thanks for your input, I meant notepadd++. The problem is that msg.Text in the code translates it without the other characters — Nirjal Khadka, Sep 28 '21 at 09:31

score 2 · Accepted Answer · answered Oct 12 '21 at 11:39

Send binary data (files) to MQ as type IBytesMessage.

You should use BodyLength to define the size of the byte[], not ReadInt.

Change the following line:

var messageLength = bytesMessage.ReadInt();

To:

var messageLength = (int)bytesMessage.BodyLength;

The ITextMessage logic works as expected when the content is text.

IBM XMS .Net how do I receive images files like png and jpg from the MQ

1 Answers1