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Compaq AAPVNFGTE manual Return Status Values Expected from Presentation Procedures

Models: AAPVNFGTE

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Table 3–1 (Cont.) Summary of Portable API Presentation Procedures

Customer-Supplied Procedure

Description

 

 

acmsdi_request

Services a TDMS Request exchange, which displays

 

a form and transfers data between a form and the

 

application program.

acmsdi_send

Services a DECforms send request, which sends

 

data from the application program to the form.

acmsdi_transceive

Services a DECforms transceive request, which

 

combines the actions of a send and a receive.

acmsdi_write_msg

Services a TDMS Write exchange, which displays

 

the text sent from the form’s message field or the

 

ACMS task.

 

 

See Compaq TP Desktop Connector for ACMS Client Application Programming Guide for a description of sample client presentation procedures.

3.1.1 Return Status Values Expected from Presentation Procedures

The presentation procedure routines must return a long integer containing any valid OpenVMS status value, including DECforms, TDMS, and application- defined values. Return status values for nonblocking presentation procedures are returned using the acmsdi_complete_pp routine. The status value is passed to the ACMS Application Execution Controller (EXC) as the completion status for the exchange step. The EXC attempts to interpret the value as a standard OpenVMS status value. Unless the task definition for the exchange step specifies CONTINUE ON FAILURE, the EXC cancels the task for an error status returned.

The TP Desktop Connector kit provides include files that specify the return status values for DECforms and TDMS: FORMS.H and TDMS.H. If the return status values change, you can regenerate the include files with the command procedures, MAKE_FORMS_H.COM and MAKE_TDMS_H.COM, in the ACMSDI$EXAMPLES directory.

To handle errors, specify the exception-handler syntax in the task definition. To have a single ACMS application support both DECforms terminals and graphical desktop systems, code the task definition to check for a DECforms error status value.

3–2Portable API Presentation Procedures

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Compaq AAPVNFGTE manual Return Status Values Expected from Presentation Procedures
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