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Passing an object between processes

Posted on 1998-08-21
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Last Modified: 2013-11-20
I have two vc++ applications that communicate using a
named pipe.  I would like to send some local variable
values down the pipe from the client to the server.  At
present the only way I have achieved this successfully
is to convert the values to one long character string.  As I have encapsulated the variables into a container class, I would like to pass the whole container object by value down the pipe.  How do I do this?  Is there an easier/better method than using pipes?
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Question by:kenick
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4 Comments
 
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Expert Comment

by:chensu
ID: 1321124
I would suggest using File Mapping. File Mapping allows two or more applications to share memory. Look into the documentation about File Mapping.
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Author Comment

by:kenick
ID: 1321125
Thats a possibility, but can you do this with pipes?  I have all the code inplace for pipe communication.  All I would like to know is how to convert an active object (or its data members) to a byte stream.
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Accepted Solution

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jstolan earned 100 total points
ID: 1321126
There are a LOT of different interprocess communication methods.  Here is one I use for a similar problem.  It is also similar to the usual drag-and-drop technique.

First lock and load an area of global data, something like this

// Allocate plenty of memory
HGLOBAL hgData =
    GlobalAlloc(GMEM_MOVEABLE|GMEM_DDESHARE|GMEM_ZEROINIT,
                sizeof(Object) );
// lock it
LPTSTR lpData = (LPTSTR)GlobalLock( hgData );
// **** Now  fill it with data here ****
// Unlock the data
GlobalUnlock( hgData );

Now you can simply send the Global handle down the pipe, or any other interprocess communication method you want.

On the other end, lock the global handle, read the data and then free the global memory.

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LVL 23

Expert Comment

by:chensu
ID: 1321127
jstolan,

Does it work in Win32?
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