IPC - Inter Process Communication - How can be achieved in Harbour ?

[Pritpal Bedi]

Hi All

I am deep into a task where IPC seems the most efficient way where I need two Harbour applications communicating with each other - text only - without setting-up a server like netio or so.

I tried with hbtcpio but seems it has different use case.

Ptitpal Bedi

a student of software analysis & concepts

[Ash]

Hello Pritpal,

Use a common folder. Process A leaves an agreed upon named text file for process B to detect, read and delete the file, and vice versa.

Regards,

Ash

[Francesco Perillo]

You may also use a dbf as a queue.... if the server has a folder... it may be a raspberry booting from sd...

I'd grep harbour source code to check if something is already present...

Here a list of functions to check

https://opensource.com/article/19/4/interprocess-communication-linux-storage

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[Pritpal Bedi]

Hi Ash

I am using this method effectively but want to have a non-disk operation solution. The usage is Harbour/HbQt based applications. Qt has a QFileSystemWatcher class which works like a charm.

Thanks 

Pritpal Bedi

a student of software analysis & concepts

[Leonardo Machado]

I also needed something like this.
At the moment I'm using a disk file, but I confess it's not the best way.
I also tried using operating system environment variables (in my case there was little information to be changed.)

Leonardo Machado

[Giovany Vecchi]

If it's for small data I advise using Hb_Socket.
To control concurrent access use everything object oriented.

[David Field]

Hello Pritpal,

If you program is running under Windows, you can send from program A to program B a message using PostMessage with a user define message that would be understood by program B to execute some routine... but if you need to pass along text information, I don't see any other way than to use a disk operation solution.

   IF IsExeRunning( ProgramB )           // Si el programa ya está corriendo
      If (hWnd := FindWindow("window_name_of_Prog_B")) <> 0    // encontrar hWnd

            PostMessage(hWnd, <User_Message>, 0,0)   // Enviar mensaje al progama

...

Regards,

David Field

[Hurricane]

are the applications on the same computer?
are the apps on the same network?
what operating systems are involved?

The following IPC mechanisms are supported by Windows:

• Clipboard
• COM
• Data Copy
• DDE
• File Mapping
• Mailslots
• Pipes
• RPC
• Windows Sockets

Regards,

Hurricane

Software developer
Training, general development

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[Auge & Ohr]

hi,

there is a File from Phil Ide using Xbase++ and Ot4xb called XbPipes.zip

but i can not attach it here in Google Group

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have search at https://blog.xbwin.com/ but i can not find Sample 

in German Xbase++ Forum there are Files from Pablo / Devcon 2007
https://www.xbaseforum.de/viewtopic.php?f=16&t=9480

download WinAPIWorkShop.zip and have a look into \WinAPIWorkShop\TestTRunProcess\

Jimmy