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    <p>Use named Pipes, but I would recommend Russell Libby's named Pipe components. There is a TPipeClient and TPipeServer component.</p> <p>As of (2013-10-04) <a href="http://francois-piette.blogspot.com/2013/04/inter-process-communication-using-pipes.html" rel="nofollow noreferrer">Francoise Piette and arno.garrels@gmx.de updated this source code</a> to compile with Delphi 7 to XE5 (earlier versions may compile however untested) and put it here: <a href="http://www.overbyte.be/frame_index.html?redirTo=/blog_source_code.html" rel="nofollow noreferrer">http://www.overbyte.be/frame_index.html?redirTo=/blog_source_code.html</a></p> <p>These 2 components make using named pipes incredibly easy, and named pipes are great for inter-process communication (IPC).</p> <p><a href="http://home.roadrunner.com/~rllibby/source.html" rel="nofollow noreferrer">His website is here</a>. Look for "Pipes.zip". The description from the source is: // Description : Set of client and server named pipe components for Delphi, as // well a console pipe redirection component.</p> <p>Also, Russell helped me out on Experts-Exchange with using an older version of this component to work in a console app to send/receive messages over named pipes. This may help as a guide in getting you up and running with using his components. Please note, that in a VCL app or service, you don't need to write your own message loop as I did in this console app. </p> <pre><code>program CmdClient; {$APPTYPE CONSOLE} uses Windows, Messages, SysUtils, Pipes; type TPipeEventHandler = class(TObject) public procedure OnPipeSent(Sender: TObject; Pipe: HPIPE; Size: DWORD); end; procedure TPipeEventHandler.OnPipeSent(Sender: TObject; Pipe: HPIPE; Size: DWORD); begin WriteLn('On Pipe Sent has executed!'); end; var lpMsg: TMsg; WideChars: Array [0..255] of WideChar; myString: String; iLength: Integer; pcHandler: TPipeClient; peHandler: TPipeEventHandler; begin // Create message queue for application PeekMessage(lpMsg, 0, WM_USER, WM_USER, PM_NOREMOVE); // Create client pipe handler pcHandler:=TPipeClient.CreateUnowned; // Resource protection try // Create event handler peHandler:=TPipeEventHandler.Create; // Resource protection try // Setup clien pipe pcHandler.PipeName:='myNamedPipe'; pcHandler.ServerName:='.'; pcHandler.OnPipeSent:=peHandler.OnPipeSent; // Resource protection try // Connect if pcHandler.Connect(5000) then begin // Dispatch messages for pipe client while PeekMessage(lpMsg, 0, 0, 0, PM_REMOVE) do DispatchMessage(lpMsg); // Setup for send myString:='the message I am sending'; iLength:=Length(myString) + 1; StringToWideChar(myString, wideChars, iLength); // Send pipe message if pcHandler.Write(wideChars, iLength * 2) then begin // Flush the pipe buffers pcHandler.FlushPipeBuffers; // Get the message if GetMessage(lpMsg, pcHandler.WindowHandle, 0, 0) then DispatchMessage(lpMsg); end; end else // Failed to connect WriteLn('Failed to connect to ', pcHandler.PipeName); finally // Show complete Write('Complete...'); // Delay ReadLn; end; finally // Disconnect event handler pcHandler.OnPipeSent:=nil; // Free event handler peHandler.Free; end; finally // Free pipe client pcHandler.Free; end; end. </code></pre>
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    1. POHow do I send a string from one instance of my Delphi program to another?
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    1. COThe library seems quite interesting, will have to read through it. :)
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      1. USPetriW
    2. COI think the link is broken, because I can't access it.
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      1. USAndrea Raimondi
    3. CO@Andrea Raimondi you can see pipes.pas here http://r3code.livejournal.com/117012.html
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      1. USLittle Helper
 

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