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Message Object Nulled before being checked
  1. Issue
0 Votes
  1. Paul Shue
  2. PowerBuilder
  3. Tuesday, 1 July 2025 07:16 PM UTC

We recently added a new process to our application which was checking the width of datawindow text fields to verify the data would fit.
This pbl (call it newstuff.pbl) contains maybe 120 dataobjects, 5 global functions, a structure, a non-visual userobject and 3 windows. Everything seems to work fine but after more testing we ran into into issues where it seems the global message object is somehow getting nulled after it is set but before it is checked. In our example we call pfc of_message. 

li_resp = gnv_app.inv_error.of_message( 'P188', ls_parm[] )

This code opens a response window (w_message with yes / no buttons. In the pfc_default event of that window the following code is run
and I checked in debug to verify that ii_buttonclicked is set correctly at the CloseWithReturn statement.

// Store the button that was pressed.
inv_errorattrib.ii_buttonclicked = ii_buttonclicked
// Store any User Input information
inv_errorattrib.is_usertext = mle_userinput.text
// Close the window.
CloseWithReturn(This, inv_errorattrib)

In pfc_n_cst_error.of_processmessage the following code  is executed and in debug, li_testrc = 1 but the IsValid(Message.powerobjectparm) returns false, so the ii_buttonclicked = 0 which is wrong.   All of this code is pfc and has nothing to do with the changes in newstuff.pbl. However if I take that pbl out of the path, then the pfc code included here works correctly. I can fix the issue by using a simple messagebox (no message object involved) instead of the gnv_app.inv_error.of_message( 'P188', ls_parm[] ), but I think that is a bandaid for the real problem and we have other areas where the same kind of thing is happening. Any idea what could be causing the message object to be cleared?

li_testrc = OpenWithParm(w_message, inv_errorpass)
If  li_testrc > 0 Then
// Get the structure passed by the response window for 
// any user input and buttonclicked.
If IsValid(Message.powerobjectparm) Then
inv_errorpass = Message.powerobjectparm
End If
End If

Using PB version 2021 Build 1509

PB 2022 - How to fetch hostname, host ip and Global IP of cl... Transparent/no border lines on a dddw using themes
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