Re: Communication between two applications

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#8421

From: Remy Lebeau (TeamB)
Date: Sat, 30 Oct 2004 18:20

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"Stefano Bonifazi" <stefboombastic@tele2.it> wrote in message
news:41827ab9@newsgroups.borland.com...

>  char YourChar='c'; //change it with the character U need :)

If you are passing a single character, then WM_COPYDATA is way overkill.
Just pass the character inside the message directly.  A single character is
just 8 bits, that can easily fit inside the 32 bits that are available for
both the wParam and lParam parameters of the message.  For example:

    #define MY_CUSTOM_MESSAGE (WM_APP + 100)

    SendMessage(pReceiveAppHandle, MY_CUSTOM_MESSAGE, YourChar, 0);

    void __fastcall TForm1::WndProc(TMessage &Message)
    {
        if( Message.Msg == MY_CUSTOM_MESSAGE )
            ShowMessage("Character arrived: " +
AnsiString((char)Message.WParam));
        else
            TForm::WndProc(Message);
    }

BTW, in your earlier example, your parameters for WM_COPYDATA were reversed.
You were passing the COPYDATASTRUCT in the wParam when you should have been
passing it in the lParam instead.


Gambit

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Subject: Re: Communication between two applications
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