RFC in C++ to SAP doesn t transfer data

Question

Hello,
I make in C++ a RFC call of a function module.
The RFC works but not the data transfer.
The import parameters of the function module in SAP are:
I_MANDT     TYPE     NUMC3
I_WERKS     TYPE     CHAR4
I_PROCESS     TYPE     CHAR10
I_STRING     TYPE     STRING
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The export definition in the C++ programm is:
exporting[0].name = malloc(7);
memcpy(exporting[0].name,"I_MANDT", 7);
exporting[0].nlen = 7;
exporting[0].type = RFCTYPE_NUM;
exporting[0].leng = 3;
exporting[0].addr = malloc(4);
memset(exporting[0].addr,0,4);
sprintf((char *) exporting[0].addr, "%04d", cst_mandt);
exporting[1].name = malloc(7);
memcpy(exporting[1].name,"I_WERKS", 7);
exporting[1].nlen = 7;
exporting[1].type = RFCTYPE_CHAR;
exporting[1].leng = 4;
exporting[1].addr = malloc(5);
memset(exporting[1].addr,0,5);
sprintf((char *) exporting[1].addr, "%05d", cst_werks);
exporting[2].name = malloc(9);
memcpy(exporting[2].name,"I_PROCESS", 9);
exporting[2].nlen = 9;
exporting[2].type = RFCTYPE_CHAR;
exporting[2].leng = 10;
exporting[2].addr = malloc(11);
memset(exporting[2].addr,0,11);
sprintf((char *) exporting[2].addr, "%11c", cst_process);
exporting[3].name = malloc(8);
memcpy(exporting[3].name,"I_STRING", 8);
exporting[3].nlen = 8;
exporting[3].type = RFCTYPE_CHAR;
exporting[3].leng = 5000;
exporting[3].addr = malloc(5001);
memset(exporting[3].addr,0,5001);
sprintf((char *) exporting[3].addr, "%5001c", chr_line);
rfc_rc = RfcCall( handle, cha_prog,
                          exporting,
                 tables);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Does anybody know, where the mistake is, that i don t get the data from the C++ to SAP transferred?
In the debugger in C++ I can see, that the fields are filled.
I would appreciate a quick answer, because the project has to be active in 2 weeks.
Thank you""
best regards
Jasmin Söllner

Answer 1

Hello,
I'm not very sure that i understand your problem but using RFC_PARAMETER data structure with export purpose you can not expect any kind of data to be returned by RfcCall().Maybe only you expect some data to be returned on the RFC_TABLE data structure.You just send some parameters to the SAP server.To receive some data you should initialize RFC_PARAMETER data structure for importing purpose and running RfcCallReceive() function.
Another issue is that you don't use one more element in your exporting array which should be initialize with NULL.In the RFC SDK documentation is written that the last element from the array should be NULL. Doesn't matter if is RFC_PARAMETER or RFC_TABLE data structure.
export[4].name=NULL;
I hope this help,
Best Regards,