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Article #4266

Re: Continuing problem with SendMessage and WM_CCOPYDATA

#4266
From: Nate
Date: Mon, 27 Feb 2006 19:18
47 lines
2203 bytes
I tried posting a reply using the web page inferface but don't
see it so I'll try again.

Bob Gonder <notbg@notmindspring.invalid> wrote:

>WM_MYMSG=RegisterWindowMessage("USDA.FS.FireScience.GooleEarthTool.Awake");

Made the change.


>>     MyCDS.lpData = &pBuf;         // address of the data
>
>You want a pointer to the data, not a pointer to a pointer to 
the data.
>     MyCDS.lpData = pBuf;         // address of the data

Found the first instance in some posted code, tried it, and
forgot to change it back.  It's been corrected.

>>//  in my main form .h

>
>>     // This function is never called...
>>void __fastcall TFormMain::WMCopyData(TWMCopyData &message)
>>{
>>   if(message.CopyDataStruct->dwData == WM_MYMSG)
>>     {
>>     Application->Restore();
>>     Show();
>
>Verify that it is never called, and not just called with 
"incorrect"
>data:
>	}else{	ShowMessage("WM_MYMSG is not correct");
>
OK, I should have done that rather than watch it in the 
debugger.  I made the change and tested it.  ShowMessage is not
called.

The receiver addess is the handle to the application but the 
receiver code is in the main form - does this matter?
What should SendMessage return on success?

Thanks

Nate
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Subject: Re: Continuing problem with SendMessage and WM_CCOPYDATA
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