🚀 go-pugleaf

"Ray Carpenter" <rjcarpenter@bigpond.com> wrote in message
news:46f6e9ca@newsgroups.borland.com...

> For a process, is there a way of obtaining the main window handle
> HWND (as needed by SendMessage()) from the process handle
> HPROCESS (as provided by ShellExecuteEx())?

There is no such thing as a "main window" from the API's perspective.  Any
thread can have any number of HWNDs associated with it.

You can enumerate the running windows using EnumWindows(), using
GetWindiowLong(GWL_HINSTANCE) to get the HINSTANCE of each window and
compare that to the one returned by ShellExecuteEx().

Alternatively, you can use CreateProcess() instead of ShellExecuteEx(), and
then use GetWindowThreadProcessId() instead of GetWindowLong() to find all
of the windows that belong to the Process ID that CreateProcess() returns.

Either way, if you only find 1 matching HWND, then you likely found its
"main" window.  Note that many applications (including VCL apps) have
multiple HWNDs in their main thread, so it is up to you to manually
determine which HWND you need to send your messages to.


Gambit