Open topic with navigation

TIBCO Rendezvous® 8.8.0

# tibrvMsgData_Encoder

Function Type

## Declaration

    typedef tibrv_status (*tibrvMsgData_Encoder)(
        char**               wire_buffer,
        tibrv_u32            mem_available,
        tibrvMsgField*       field);

## Purpose

Encode a local format field to wire format.

## Remarks

Programs define encoders for custom datatypes. Layer 2 encoder functions translate custom datatypes into Rendezvous wire format.

Each encoder must fulfill these responsibilities:

| • | Check that the field contains valid data of the appropriate type.

| • | Check that the data will fit in the available space; if not, return the error status TIBRV_NO_MEMORY.

The encoder can use tibrvMsgData_ByteSize() to compute the wire size of the data.

| • | Write the data into wire buffer of the message. Do not overwrite space that is not available.

| • | Advance `*wire_buffer` to the end of the destination data (in the message). tibrvMsgData_CopyBytes() automatically advances this buffer pointer.

| • | Check consistency, and properly address byte order and endian issues.

Note | If your encoder implementation allocates process storage, it must call tibrvMsgData_Malloc() rather than `malloc`.

Parameter | Description
`wire_buffer` | This parameter receives the location of an address within the wire buffer of the destination message. The encoder must write the wire-format encoded data to this destination. We strongly recommend using tibrvMsgData_CopyBytes() to transfer the data.
`mem_available` | This parameter receives the size of the available storage in the message’s wire buffer.
`field` | This parameter receives a field object, with self-describing data in local format. This source field determines the data to place into the destination `wire_buffer`.

Figure 196: Advancing the Wire Buffer Pointer

## See Also

tibrvMsgField

tibrvMsgData_ByteSize()

tibrvMsgData_CopyBytes()

Did you find this helpful?

Yes No
Great!
Thanks for taking the time to give us some feedback.
Sorry about that

Why wasn't this helpful? (check all that apply)

Could not find what I was looking for
Instructions confusing or unclear
Instructions did not work

Want to tell us more?

Please select at least one option or provide details about the issue!!

Error occurred while submitting feedback.

Error2 occurred while submitting feedback.

TIBCO Rendezvous®

Copyright © 1997-2025. Cloud Software Group, Inc. All Rights Reserved.