Advanced Function Calls 
Advanced Function Calls
Definition
In addition to the calls of the CPI-C Starter Set, the following Advanced Function Calls are also available (with platform-specific restrictions):
Use
Available Advanced Function Calls
Function |
Task |
| CMCFM |
Requests receipt acknowledgement from partner |
| CMCFMD |
Sends receipt acknowledgement to partner |
| CMCNVO |
Converts data buffer from ASCII to EBCDIC |
| CMCVNI |
Converts data buffer from EBCDIC to ASCII |
| CMSCSP |
Sets the Conversation Security Password |
| CMSCST |
Sets the Conversation Security Type |
| CMSCSU |
Sets the Conversation Security User ID |
| CMSPLN |
Sets the logical unit (LU) of the partner LU |
| CMSTPN |
Sets the transaction program name |
| CMSSL |
Sets the synchronization level |
All functions are of type CM_RETCODE.
The syntax of the Advanced Function Calls is described in the following topics.
The functions CMCFM and CMCFMD are not available in cpictlib.
CMCNVO and CMCNVI are necessary because the R/2 System on the host only expects data in EBCDIC format, whereas the workstation generally only processes ASCII data.
CMSCST, CMSCSU, CMSCSP and CMSTPN (only for IMS) are necessary, if the LU6.2 partner system uses an external security system (for example, RACF on the host).
The standard definition of the SAP-CPI-C interface and the return codes of the individual CPI-C calls are defined in the file cpic.h.