7.3 Use the Trace Handler

After creating a Trace Handler it can be added to your application. This can be done as part of the initialization with a simple Define_Com statement. For example, if the Trace Handler was created as a component called

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Define_Com Class(#Tracing) name(#TraceHandler)
 
If you are using the 7.2 Example Trace Handler this is all you need to do to expose the Trace Handler for use in your application. It is a self-contained object that will set itself as the system trace handler if a suitable trigger condition is satisfied. In the example, this is the existence of the file TracingOn.txt in the system source folder.

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TraceMessageData has a source parameter and nine variant parameters. The variant parameters are substituted into the source parameter as if the Substitute intrinsic were being used.
#Sys_Appln.TraceMessageData("Employee &1 Name &2 &3" #Empno #Givename #Surname)  
Refer to 7.4 Example Use of Tracing for a sample form incorporating trace commands.
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