The mi_fp_retlen() function

The mi_fp_retlen() accessor function obtains the length of a return value of a user-defined function from its associated MI_FPARAM structure.

Syntax

mi_integer mi_fp_retlen(fparam_ptr, ret_pos)
   MI_FPARAM *fparam_ptr;
   mi_integer ret_pos;
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. For user-defined functions, the only valid value is 0.
Valid in client LIBMI application? Valid in user-defined routine?
Yes Yes

Usage

The mi_fp_retlen() function obtains the length of the routine return value at position ret_pos from 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. To obtain information about the nth return value, use a ret_pos value of n-1. For example, the following call to mi_fp_retlen() obtains the length for the first return value of the my_func() user-defined function, with which fparam1 is associated: 
mi_integer my_func(..., fparam1)
   ...
   MI_FPARAM *fparam1;
{
   mi_integer ret_len;
   ...
   ret_len = mi_fp_retlen(fparam1, 0);
Important: C user-defined functions always have only one return value.

For more information about return-value information in an MI_FPARAM structure, see the Informix® DataBlade® API Programmer's Guide.

Return values

>=0
The length, in bytes, of the return value at position ret_pos.
MI_ERROR
The function was not successful.