long mpiCaptureMemory(MPICapture  capture,
                      void        **memory) 

CaptureMemory writes an address [which is used to access a Capture object's (capture) memory] to the contents of memory. This address, or an address calculated from it, can be passed as the src parameter to mpiCaptureMemoryGet(...) and as the dst parameter to mpiCaptureMemorySet(...).