MQSeries.net :: View topic - Who can give me a simple example of Channel Exit?

spinning

I'm a greenhand of the MQSeries. But my project want to implement a very simple Channel Exit for advertising. I have download some examples. But these examples a too complex. I want only a simple one. I want to know how to implement the send exit and receive exit only. I don't know much about the RSA and DSS. I want to know how I can get the exact context of the information that application want to send via the MCA channels.
I need to implement the Send Exit and Recive Exit. My exit get the parameter MQCHT_SEND, but I don't know where the real data begins. I have dumpped all the buffer that I get, but I have fond that there is too much information. For example I send "Hello World", but the buffer I get is longer than 300 characters. I don't know where the "Hello World" begins. And when I encrypt the "Hello World"(for example I tuurn the "Hello World" into "dlroW olleH"). How can I send the "dlroW olleH" to MCA?
Thanks a lot