Example:  

lrt_save_fld_val (fbfr, "name", occurrence, "param_name");

Example:  

In the following example, a bank account was opened and the account number was stored to a parameter, account_id.

/* Fill the data_0 buffer with new account information*/
data_0 = lrt_tpalloc("FML", "", 512);
lrt_Finitialize((FBFR*)data_0);
lrt_Fadd_fld((FBFR*)data_0, "name=BRANCH_ID", "value=1", LRT_END_OF_PARMS);
lrt_Fadd_fld((FBFR*)data_0, "name=ACCT_TYPE", "value=S", LRT_END_OF_PARMS);
...
LRT_END_OF_PARMS);
lrt_Fadd_fld((FBFR*)data_0, "name=LAST_NAME", "value=Doe", ...);
lrt_Fadd_fld((FBFR*)data_0, "name=FIRST_NAME", "value=John", ...);
lrt_Fadd_fld((FBFR*)data_0, "name=SAMOUNT", "value=234.12", ...);
/* Open a new account and save the new account number*/
tpresult_int = lrt_tpcall("OPEN_ACCT", data_0, 0,    &data_0, &olen_2, 0);
lrt_abort_on_error();
lrt_save_fld_val((FBFR*)data_0, "name=ACCOUNT_ID", 0, "account_id");
/* Use result from first query to fill buffer for the deposit*/
lrt_Finitialize((FBFR*)data_0);
lrt_Fadd_fld((FBFR*)data_0, "name=ACCOUNT_ID", "value={account_id}", LRT_END_OF_PARMS);
lrt_Fadd_fld((FBFR*)data_0, "name=SAMOUNT", "value=200.11", ...);

In the above example, the account ID was represented by a field name, ACCOUNT_ID. Some systems represent a field by an ID number rather than a field name during recording.

You can correlate by field ID as follows:

lrt_save_fld_val((FBFR*)data_0, "id=8302", 0, "account_id");    

Example:  

In the following example, an employee ID from a CARRAY buffer must be saved for later use. The recorded value was "G001" as shown in the output.

lrt_tpcall:227, PprLoad, 1782
Reply Buffer received.
...
123    "G001"
126    "..."    
134    "Claudia"

Insert lrt_save_parm using the offset, 123, immediately after the request buffer that sends "PprLoad" and 227 bytes.

/* Request CARRAY buffer 57 */
    lrt_memcpy(data_0, buf_143, 227);
    tpresult_int = lrt_tpcall("PprLoad",
        data_0, 227, &data_1, &olen, TPSIGRSTRT);
    lrt_save_parm(data_1, 123, 9, "empid");

In the replay.vdf file, replace the recorded value, "G001", with the parameter, empid.

char buf_143[] =    "\xf5\x0\x0\x0\x4\x3\x2\x1\x1\x0\x0\x0\xbc\x2\x0\x0\x0\x0\x0\x0"
    "X"
"\x89\x0\x0\x0\xb\x0"
    "SPprLoadReq"
    "\xff\x0\x10\x0\x0\x4\x3\x6"
    "{empid}" // G001
    "\x7"
    "Claudia"
    "\xe"
    "LAST_NAME_SRCH"
...

This function can also be used to save a portion of a character array within an FML buffer. In the following example, the phone number is a character array, and the area code is the first three characters. First, the lrt_save_fld_val statement saves the phone number to a parameter, phone_num. The lrt_save_parm statement uses lr_eval_string to turn the phone number into a character array and then saves the area code into a parameter called area_code.

lrt_save_fld_val((FBFR*)data_0, "name=PHONE", 0, "phone_num");
lrt_save_parm(lr_eval_string("{phone_num}"), 0, 3, "area_code");
lr_log_message("The area code is %s\n", lr_eval_string("{area_code}"));