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ToolTalk User's Guide
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Document Information


1.  Introducing the ToolTalk Service

2.  An Overview of the ToolTalk Service

3.  Message Patterns

4.  Setting Up and Maintaining the ToolTalk Processes

5.  Maintaining Application Information

6.  Maintaining Files and Objects Referenced in ToolTalk Messages

7.  Participating in ToolTalk Sessions

8.  Sending Messages

9.  Dynamic Message Patterns

10.  Static Message Patterns

11.  Receiving Messages

12.  Objects

13.  Managing Information Storage

14.  Handling Errors

Retrieving ToolTalk Error Status

Checking ToolTalk Error Status

Returned Value Status

Functions with Natural Return Values

Functions with No Natural Return Values

Returned Pointer Status

Returned Integer Status

Broken Connections

Error Propagation

A.  Migrating from the Classing Engine to the ToolTalk Types Database

B.  A Simple Demonstration of How the ToolTalk Service Works

C.  The ToolTalk Standard Message Sets

D.  Frequently Asked Questions



Error Propagation

ToolTalk functions that accept pointers always check the pointer passed in and return TT_ERR_POINTER if the pointer is an error value. This check allows you to combine calls in reasonable ways without checking the value of the pointer for every single call.

In , a message is created, filled in, and sent. If tt_message_create fails, an error object is assigned to m, and all the tt_message_xxx_set and tt_message_send calls fail. To detect the error without checking between each call, you only need to check the return code from tt_message_send.

Example 14-4 Error Checking

Tt_message m;

if (tt_rc!=TT_OK)...