🚀 go-pugleaf

Ok my app is now working correctly, many thanks.

I now have another problem however. The call to FindWindow() to get the 
form's handle relies on the form's caption being a predefined value. 
What if I want to change the caption at runtime? Is there any way around 
this?



Damon Chandler (TeamB) wrote:
> Hi,
> 
> You're catching the WM_COPYDATA in your TFormMain class, but you're 
> sending the message to the window whose handle is returned via the 
> following call...
> 
> HWND hWnd = FindWindow("TApplication", "MutexTest");
> 
> I don't believe the above call is returning the correct handle.  You 
> should replace "TApplication" with "TFormMain" and adjust the second 
> parameter to the form's caption.
> 
> As a side note, there's no need to use the WindowProc property since you 
> can override the WndProc() method directly.
> 
> Cheers,
> -- 
> Damon Chandler (TeamB)
> C++Builder Developer's Journal
> http://bcbjournal.com
> http://bcbjournal.org
> 
> anon5 wrote:
>> Hey guys
>>
>> I am trying to create a 'once-only' app (only one instance can run). 
> [snip 8<----]
>> Now, the once-only aspect of the app works great. But my WM_COPYDATA 
>> message isn't being picked up at all. If anyone can help at all it 
>> would be fantastic. Thanks!