1. Tracy Lamb
  2. PowerBuilder
  3. Wednesday, 7 June 2023 15:18 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.



Accepted Answer
Tracy Lamb Accepted Answer Pending Moderation
  1. Friday, 9 June 2023 11:37 AM UTC
  2. PowerBuilder
  3. # Permalink

Thank you Roland, Chris and John,

Chris, I found the 2 examples provided in the link especially helpful.  It turns out, my customer hasn't used the built-in worksheets in many years!  It's been a very long time since I've upgraded this customer's software, and when I asked the customer which "worksheets" they were using, she told me the Pin Gages and the Gage Blocks, so I was trying to update both of those worksheets.  Turns out they're using the ACPs I wrote in LabView almost 20 years ago, Pin Gage ACP and Gage Block ACP, not the worksheets. Tragically funny miscommunication!!!  In the meantime, I will save the examples I got in the unlikely event I need to try to resurrect something that uses the Serial portin the future.



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Roland Smith Accepted Answer Pending Moderation
  1. Wednesday, 7 June 2023 17:49 PM UTC
  2. PowerBuilder
  3. # 1

User.exe is 16bit so Windows 98 timeframe.

Take a look at this:


It is also possible to communicate with COMM ports with the built-in file functions.

  1. Chris Pollach @Appeon
  2. Thursday, 8 June 2023 02:18 AM UTC
Hi Tracy;

You can read the datum directly from a Com Port via PowerScript.



Regards ... Chris
  1. Helpful 1
  1. Roland Smith
  2. Thursday, 8 June 2023 12:40 PM UTC
What device is on the port? There is a good chance the data will be Ansi so you may need to read it into a blob and then convert it to a string using EncodingANSI! as the second argument.
  1. Helpful 1
  1. Tracy Lamb
  2. Thursday, 8 June 2023 16:20 PM UTC

There are several different devices that use the Serial Port. The devices are measurement machines for measuring gage blocks, pin gages, coordinate measurment machine, etc.
  1. Helpful
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John Fauss Accepted Answer Pending Moderation
  1. Wednesday, 7 June 2023 16:30 PM UTC
  2. PowerBuilder
  3. # 2

Hi, Tracy - 

I can find nothing in any Win32 API documentation for an API function named "OpenComm".

"user.exe" was, I believe, the pre-cursor to user32.dll in Windows 3.11 and earlier. This leads me to believe that OpenComm is a Win16 API function, and Win16 documentation is very hard to find nearly 30 years after the fact.

I suspect you will have to recode this functionality from scratch using Win32 interfaces/techniques.

Best regards, John

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