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Resolved DDE - PB to PB

  1. How-to
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  1. Samuel Sanchez Avila
    Samuel Sanchez Avila
  2. PowerBuilder
  3. Wednesday, 15 January 2020 16:45 PM UTC

Hello, im trying to pass data throw 2 PB Apps already ejecuting. I find DDE functions and im testing this:

 

PB APP 1 - APP SERVER

      StartServerDDE (this,"MyPBApp","System")

PB APP 2 - APP CLIENT

      long handle

      handle=OpenChannel("MyPBApp","System")

      //handle returning a large ramdom positive number

 

Now, how can i pass data between apps? That was only conection part.

Examples shows how to do it with Excel...

 

Thanks...

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Accepted Answer
Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Wednesday, 15 January 2020 18:15 PM UTC
  2. PowerBuilder
  3. # Permalink

Hi Samuel;

1) Have you tried the OpenChannel command passing in the 3rd argument (Window address)?

Note: DDE is working OK for me in PB2017R3 test on W10 ...

2) You can also the FindWindow SDK command followed by a Send/PostMessage command to communicate between PB Apps...

http://chrispollach.blogspot.com/search?q=Send+Message

3) The third alternative could be to use TCP/IP...

http://chrispollach.blogspot.com/2019/12/socket.html

HTH

Regards ... Chris

 

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Samuel Sanchez Avila
  1. Samuel Sanchez Avila
  2. Wednesday, 15 January 2020 18:41 PM UTC
Hello Chris.



I alter my StartSeverDDE, using a 3th argument.



StartServerDDE ("app_b","app_b","is_param")



Now im able to use setremote



ll_handle = OpenChannel("app_b","app_b")



setremote("is_param","data from A", ll_handle) // Setremote return 1



But dont know how to catch the value in APP2 from App1. I suppose that is with a getdatadde, but in a button or in open event?
  1. Helpful
Samuel Sanchez Avila
  1. Samuel Sanchez Avila
  2. Wednesday, 15 January 2020 18:54 PM UTC
Never Mind GetDataDDE goes in a event called remotsend.



Thanks very much for u example.
  1. Helpful
Chris Pollach @Appeon
  1. Chris Pollach @Appeon
  2. Wednesday, 15 January 2020 19:44 PM UTC
Yes, you will still need to code the RemoteExec, RemoteHotLinkStart, RemoteHotLinkStop, RemoteRequest, and/or possibly the RemoteSend events - depending on the DDE features that you use.

BTW: If you would like a copy of my DDE demo App, please send me a PM and I can Zip it up for you. ;-)

Chris.Dot.Pollach.At.Appeon.Dot.com ... [edit accordingly]
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Responses (3)
Olan Knight
Olan Knight Accepted Answer Pending Moderation
  1. Wednesday, 15 January 2020 18:19 PM UTC
  2. PowerBuilder
  3. # 1

Two ways I can see:

1) Have a table in the database specifically for trans-application communication
    The table is empty when there is no data to transfer
    The table is populated when data is to be transferred  - with one row of data per item to be transferred
    The apps have a timer, when it expires they check the table for rowcount
    If rowcount > 0 then read the rows to see if the data is for app A or app B
    If app A is checking the table and the data is for app A, process the data then delete the row from the table
    Same for app B
    Reset the time


2) Everything is the same as above except you have a dedicated folder and each app creates files to tranfer data
    The folder is empty when there is no data to transfer
    To transfer data you create a file with the appropriate data in it
   


Olan

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Samuel Sanchez Avila
  1. Samuel Sanchez Avila
  2. Wednesday, 15 January 2020 18:39 PM UTC
Hello Olan.



Yes, the first one is my alternative method in case this dont work. Thanks for your reply
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Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Wednesday, 15 January 2020 20:49 PM UTC
  2. PowerBuilder
  3. # 2

I would be surprised if DDE actually worked.

You should try Winsock. It will work between two computers, something DDE cannot do.

http://www.topwizprogramming.com/freecode_winsock.html

 

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