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Resolved PowerBuilder crashed via PBNI call

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  1. Alexander Strelkov
    Alexander Strelkov
  2. PowerBuilder
  3. Saturday, 24 March 2018 08:48 AM UTC

Hi,

I use PBNI class and  try to call GetItemNumber/GetItemDecimal methods of some transferred to c++ DataWindow object reference/ All works just fine until DataWindow's numeric cell contains NULL value. In this case PB crashed when session->InvokeObjectFunction(...) is invoked as from IDE and from standalone EXE module. My PB version 2017 (build 1666). The same result has been received  in PB 11.5 so I think that this is a very long PB error. 

P.S.:

I use MS VS 2017 (Community Edition) and professional Windows 7 64 bit OS.

 

  1. PBNI
Different results with same datawindow filter
PB upgrade from 7.0 to 2017 R3 issue
Responses (3)
Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Monday, 26 March 2018 12:23 PM UTC
  2. PowerBuilder
  3. # 1

I have done a lot with PBNI but have not tried accessing a DataWindow. I do know there is an IsNull method.

I have VS Community 2015 & 2017 on Windows 10.

 

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Alexander Strelkov
  1. Alexander Strelkov
  2. Monday, 26 March 2018 18:24 PM UTC
Roland,



I know that you have a strong experience with PBNI and very glad that you have been replied for my message.Before to call a check function such



as IsNull we must get that value, i.e. call GetItem method. But exactly this call crash the PB/PBNI session. A very strange error. The self-titled call in



pure PB works fine, and more, GetItemString, GetItemTime, GetItemDate GetItemDateTime methods are invoked via PBNI without any problem in the



same situation. The ambush with numeric fields only.

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Aut Design
Aut Design Accepted Answer Pending Moderation
  1. Thursday, 25 July 2019 06:23 AM UTC
  2. PowerBuilder
  3. # 2

what is IsNull method?

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Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Thursday, 25 July 2019 17:27 PM UTC
  2. PowerBuilder
  3. # 3

Here are some lines of C++ code from one of my programs that is passed an array of numbers:

IPB_Value* ipv;

pblong somenumber;

ipv = session->AcquireArrayItemValue(pbArgValues, dim);

if (ipv->IsNull()) {
   // value is null
}
else {
   // value is not null

   somenumber = ipv->GetLong();
}

 

I haven't tried accessing a DataWindow from C++ but it should be similar.

 

Comment
Alexander Strelkov
  1. Alexander Strelkov
  2. Thursday, 25 July 2019 17:50 PM UTC
Roland,



As I've written about this already:

With regard to IsNull: we must get that value before to apply it, i.e. call GetItemNumber/Decimal method. But exactly this call leads to crash the PB/PBNI session. A very strange error.
  1. Helpful
Roland Smith
  1. Roland Smith
  2. Thursday, 25 July 2019 18:06 PM UTC
Is the crash from PB code called from C++ or in the C++ code?
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