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Resolved SendMessage text from C# to PowerBuilder

  1. How-to
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  1. C K
    C K
  2. PowerBuilder
  3. Sunday, 22 October 2023 09:16 AM UTC

Hello,

I have to send a text(string) message from C# application to PowerBuilder application via SendMessage function.

When i sent as a followinf code, Powerbulder's Message object doesnt got the stringparam' only long param

C# code: SendMessageW(long.Parse(args[0]), 7000000, 0, "k");

Thanks,

Chava.

 

Compiler Error moving project from PB2019 to PB202...
DataWindow .Update executes but record is not inse...
Responses (4)
Benjamin Gaesslein
Benjamin Gaesslein Accepted Answer Pending Moderation
  1. Monday, 23 October 2023 13:24 PM UTC
  2. PowerBuilder
  3. # 1

Hi Chava,

SendMessage does not actually send a string but the memory address of a string in LongParm. To read the string from the address in LongParm, use the String() function like this:

string stringParm
stringParm = String(Message.LongParm, "address")
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Andreas Mykonios
Andreas Mykonios Accepted Answer Pending Moderation
  1. Monday, 23 October 2023 12:33 PM UTC
  2. PowerBuilder
  3. # 2

Are you sure that 7000000 is a valid value to send (second parameter)?

Andreas.

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Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Monday, 23 October 2023 09:03 AM UTC
  2. PowerBuilder
  3. # 3

Hi Chava,

If you are using PB 2022 there's another way of sending a string to PB:

https://docs.appeon.com/pb2022/application_techniques/Triggering_PowerScript_events_from_code.html

regards

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John Fauss
John Fauss Accepted Answer Pending Moderation
  1. Sunday, 22 October 2023 15:10 PM UTC
  2. PowerBuilder
  3. # 4

Hi, Chava -

Is the C# code sending the address of an ANSI string or a Unicode 16LE (Little Endian) string? The SendMessageW WinAPI function is for “Wide” (i.e., Unicode) strings. Try using SendMessageA if sending the address of an ANSI-encoded string.

Also, if the PB app will be compiled to run as 64-bit, use Longptr data type instead of Long. 

Finally, I suggest you test with a small string first and verify the exchange works as intended, then scale up to larger-length values. 

Best regards, John

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Andreas Mykonios
  1. Andreas Mykonios
  2. Monday, 23 October 2023 12:31 PM UTC
Then the longptr and x64 compilation that mentions John is irrelevant in your case.

Andreas.
  1. Helpful
Roland Smith
  1. Roland Smith
  2. Monday, 23 October 2023 14:20 PM UTC
Message.StringParm is only for internal PowerBuilder object interactions. The SendMessage function will have the string memory address in the lparam event argument. To convert to a string in PB, do this: ls_msg = String(lparam, "address")

That being said, the PB app may not have access to the C# app's memory space. It might be better to use Winsock to send the message. I have a good example here: https://www.topwizprogramming.com/freecode_winsock.html
  1. Helpful
Arnd Schmidt
  1. Arnd Schmidt
  2. Wednesday, 25 October 2023 23:41 PM UTC
https://community.appeon.com/index.php/qna/q-a/receiving-wm-copydata-messages
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