FindWindowEx Logik

[toms]

Habe diese Antwort in der Delphi Newsgroup erhalten:

Zitat:

<quote
source="ms-help://MS.MSDNQTR.2004JAN.1033/winui/winui/windowsuserinterface/wind
owing/windows/windowreference/windowfunctions/findwindowex.htm">
If the lpszWindow parameter is not NULL, FindWindowEx calls the GetWindowText
function to retrieve the window name for comparison. For a description of a
potential problem that can arise, see the Remarks section of GetWindowText.
</quote>

The remarks section for GetWindowText is, however, somewhat misleading. The
naked truth is that GetWindowText cannot retrieve the caption of a window in
another process reliably because it is *not* using WM_GETTEXT in that case. And
that is what would have to be done to match on the caption in your FindWindowEx
call.

Fazit: Bei der FindWindowEx() Funktion lpszWindow nil übergeben, wenn sie
Childfenster in einem anderen Prozess sucht.

Grund: FindWindowEx vergleicht bei Angabge von lpszWindow die Übereinstimmung des FensterNamens (lpszWindow) mittels GetWindowText, welche aber nicht zuverlässig ChildFenster Text in einem anderen Prozess ermitteln kann.

Delphi-Quellcode:

HWND FindWindowEx(

    HWND hwndParent,   // handle to parent window
    HWND hwndChildAfter,   // handle to a child window 
    LPCTSTR lpszClass,   // pointer to class name
    LPCTSTR lpszWindow   // pointer to window name
   );