The mi_fp_setretlen() function
The mi_fp_setretlen() accessor function sets the length of a return value of a user-defined function from its associated MI_FPARAM structure.
Syntax
void mi_fp_setretlen(fparam_ptr, ret_pos, ret_len)
MI_FPARAM *fparam_ptr;
mi_integer ret_pos;
mi_integer ret_len;- fparam_ptr
- A pointer to the associated MI_FPARAM structure.
- ret_pos
- The index position into the return-length array for the return
value whose length you want to set. For C user-defined functions,
the only valid value is
0. - ret_len
- The length, in bytes, to set for the ret_pos+1 return value.
| Valid in client LIBMI application? | Valid in user-defined routine? |
|---|---|
| Yes | Yes |
Usage
The mi_fp_setretlen() function sets the length of the function return value at position ret_pos in the MI_FPARAM structure that fparam_ptr references. The MI_FPARAM structure stores information about return-value lengths in the zero-based return-length array.
For more information about return-value information in an MI_FPARAM structure, see the Informix® DataBlade® API Programmer's Guide.
To
set information for the nth return value, use a ret_pos value
of n
-1. For example, the following call to mi_fp_setretlen() sets
the length to 4 bytes for the first return value of the my_func() UDR,
with which fparam1 is associated: mi_integer my_func(..., fparam1)
...
MI_FPARAM *fparam1;
{
...
mi_fp_setretlen(fparam1, 0, 4);Important: C
user-defined functions always have only one return value.
Return values
None.