Re: WM_COPYDATA problem

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#8787

From: Hans Galema
Date: Tue, 14 Sep 2004 19:50

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JD wrote:

>     ShowMessage( IntToStr(sizeof(buff)) );
> 
> You'll see that the result falls well short of 1024 bytes.

No. It will show 1024 as buff is defined as "char buff [1024];".

> Also note that you are not accounting for the NULL terminator
> of the AnsiString:

>     cds.cbData=AnsiStringToSend.Length();//<1024
> 
> That should be .Length() + 1;

In general that would be a good idea. But it is not needed
here when indeed Length() < 1024.

> Fix either of these and it will work but you should fix both
> and add code to make sure that the sending string length is
> never greater than 1023 because it needs the extra for the
> NULL terminator.

The 0 terminator is always there as buff is first filled with 1024 zero's.
What could be the problem is that the c_str() pointer is not valid
during the call of SendMessage.

Better copy the content of that AnsiString in a local char buffer
and send the char buffer.

Hans.
an

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