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Resolved Error calling external function
  1. How-to
  2.  PowerBuilder (Appeon)
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  1. Tracy Lamb
  2. PowerBuilder
  3. Wednesday, 7 June 2023 03:18 PM UTC

Hi all,

I have a custom user object I designed 20+ years ago to communicate with a serial port, uo_comport.   The object has several local external functions defined.  All of the functions are from the Windows user.exe library.  Here's an example of one of the function declarations:

FUNCTION int OpenComm(string IpcomName,int wInQue, int wOutQue) LIBRARY "user.exe" alias for "OpenComm;Ansi"

I'm trying to just import the object from PB2019 into my PB2021 app. It regenerates fine, and I can open it and look at the code.  But keep getting the following error when I'm running the application from the IDE:

uf_open, Line 14 is:

ii_ComID = OpenComm(as_com_port,ai_InBuffer_Size,ai_OutBuffer_Size)

I'm wondering if I should be using a different library? Maybe "user32.dll" ?  I really don't want to re-write all the code if I can avoid it.

I'm using PB2021, Build 1509 and Windows 10.

TIA,

~~~Tracy

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