When you create a C/C++ service, Designer creates a Java service. This Java service calls the C program that you have created.

The C service is the means by which your C program is exposed to clients. The C service also supplies the input/output parameters for the C program, which makes it possible to include it in a flow service and link its inputs and output on the Pipeline view.

Designer generates all the Java code needed to successfully call your C program. You may add your own custom code to the C/C++ service editor if you want to execute any special procedures before or after executing the C program.