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Send a Message to an Application

Posted on 1998-04-14
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Last Modified: 2010-04-10
I'd like to send a message in my application to other
applications.
my application receives data from serial port and process
these data. once i finish this process  i want to notify
 any other applications of getting theses data or use theses data.how can i send message to other application.
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Question by:khs
6 Comments
 
LVL 5

Expert Comment

by:yonat
ID: 1184288
In MS Windows, use SendMessage() or PostMessage().
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Author Comment

by:khs
ID: 1184289
sorry! your answer is not suite for me. i'd like to konw detailed
example code.
I already know SendMessage() and PostMessage() functions.


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Accepted Solution

by:
gds earned 200 total points
ID: 1184290
In 32-bit Windows there are several ways of doing an inter-process communication:

1.  You can set up a piece of global shared memory, using CreateFileMapping, OpenFileMapping and MapViewOfFile.  Then use a named mutex to control access to the shared memory, and a global named event to signal from the source to the client that new data is available.

2.  Use a named pipe.  Make the client app listen on a pipe, and have the source app stuff data into the pipe.  This has the advantage over (1) that the two processes can be on separate computers.

3.  Use an RPC call from the source to the client.  You can configure an RPC to work purely locally using a lightweight RPC, so the processes can be on the same computer.

4.  Failing all of that, use

PostMessage(HWND_BROADCAST,msgMyMessage,0,0)

where msgMyMessage is a userdefined message ID obtained from a call to RegisterWindowMessage.  All top-level windows will receive the message, but (presumably) only your client apps will understand the registered message.
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Author Comment

by:khs
ID: 1184291
I don't understand your answer.I am a novice.
I am using now MFC 5.0 .
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LVL 11

Expert Comment

by:alexo
ID: 1184292
Sending messages to other applications is easy.  You need to aquire the window handle of the other application window you'd like to send messages to.  For example, you can use:

    hwnd = FindWindow(NULL, "the title of the window");
    if (hwnd != NULL)
        PostMessage(hwnd, message, 0, 0);

Or, you can broadcast a message to all windows in the system:

    PostMessage(HWND_BROADCAST, message, 0, 0);

Where "message" is either one of the standard messages (WM_xxx) or a user-defined one.

You can define messages for inter-application communications by asking Windows to provide a unique message number:

    message = RegisterWindowMessage("Message ID string");

Note that the program that receives the message should now how to deal with it :-)

Is this a satisfactory answer?

0
 

Expert Comment

by:Skrobotz
ID: 1184293
Use the Command:

In the Sending Program use
RegisterWindowMessage(..)
and
PostMessage(..)

In the program that must recieve the message use the command
RegisterWindowMessage(..) and wrote a Routine to process the Message.


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