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Using Predefined Constants

Reflection 2008 frequently uses predefined constants in place of numbers to make macros easier to read. Predefined constants may be used as method arguments, property values, or error codes.

The last two lines in the following example show equivalent ways to handle errors in IBM sessions. The first statement uses a Reflection predefined constant, and the second statement uses the numeric equivalent:

Dim ret As ReturnCode

ret=ThisIbmScreen.WaitForHostSett(6000, 3000)

If ret = ReturnCode.ReturnCode_Timeout Then MsgBox "Time out"
If ret = 4 Then MsgBox "Time out"

Using Predefined Constants in Other Applications

You can use Reflection predefined constants in other applications by selecting the Reflection class libraries.

  1. In the Visual Basic Editor, choose Tools > References.
  2. Select the Reflection 2008 class libraries:





  3. To use legacy predefined constants in other applications, select the appropriate class library.


For this legacy application

Select this class assembly


Reflection for IBM



Reflection for ReGIS Graphics



Reflection for UNIX and OpenVMS


Related Topics

Error Codes for IBM Terminals

Error Codes for OpenSystems Terminals