[DUG] Sending data between process on same computer on windows

[Leigh Wanstead]

Hi Ross,

Is the code sample inside a dos command line application or you start a
thread to do that communication?

TIA

Regards
Leigh
www.smootharm.com
  -----Original Message-----
  From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]On
Behalf Of Ross Levis
  Sent: Wednesday, May 09, 2007 2:24 PM
  To: 'NZ Borland Developers Group - Delphi List'
  Subject: RE: [DUG] Sending data between process on same computer on
windows


  I guess you've read the readme.txt which explains all the properties and
methods.  Install it as a component.  Drop the component on a form in 2
programs.



  I use a record pointer to share.  Here is a small example.  My record
actually contains many more fields.



  type

    TShareRec = record

      Command: Integer;

      Filename: String[255];

    End;

    PShareRec = ^TShareRec;



  Var

    ShareRec: PShareRec;

  Begin

    SharedMemory.ShareName := 'Something';

    SharedMemory.Size := Sizeof(TShareRec);

    If not SharedMemory.OpenMemory then

      SharedMemory.CreateMemory;

    ShareRec := SharedMemory.MapMemory;



  The above will work in both apps.  You can then assign ShareRec.Command :=
1; for example, and the other app can see it instantly.



  Be sure to UnmapMemory and CloseMemory when closing.



  Don't use pointer types such as dynamic Strings or classes as they will
not work.



  Cheers,

  Ross.



  From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of Jason Coley
  Sent: Wednesday, 9 May 2007 13:51
  To: NZ Borland Developers Group - Delphi List
  Subject: RE: [DUG] Sending data between process on same computer on
windows



  Do you have any samples on how to work this component, I can't find much
on the net about it either, apart from download links.



  Jason



    I would use shared memory.  I use this free component.

    http://www.torry.net/vcl/system/appscommunications/sharedmemory.zip



    It uses a memory mapped file system but without a physical file.  It can
use messages for triggering events at each end, but I actually use a
variable in a record which I check in a 10ms loop to know when to do
something.  It works very well.



    Ross.
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