How to get (hwnd)handle window for all opend windows

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Hi,

The below code returns unique Id for the Excel.

C#

[DllImportAttribute("User32.dll")]
        private static extern int FindWindow(String ClassName, String WindowName);
int hWnd = FindWindow(null,"Micosoft Excel");

But i have opened one excel file name "Book1.xls" the below code return 0.

XML

<pre lang="cs">[DllImportAttribute(&quot;User32.dll&quot;)]
        private static extern int FindWindow(String ClassName, String WindowName);
int hWnd = FindWindow(null,""Book1"");</pre>

can you please help me to get unique id of my opened file.

Thanks,

Posted 5-Apr-13 6:39am

Ayyappan Ravi

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Sergey Alexandrovich Kryukov 5-Apr-13 13:34pm

It may depend on what .NET UI library do you use; please tag it. Also, "all windows" — in what scope? In one process/application, in the whole system session at this moment, what?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-04-05T07:42:00

If you really want to get all windows in the Windows session, you can first retrieve the HWMD of desktop and than get all its children. Please see:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms633504%28v=vs.85%29.aspx[^],
http://msdn.microsoft.com/en-us/library/windows/desktop/ms633515%28v=vs.85%29.aspx[^].

However, I'm not sure you need exactly that. Instead, you can get all the executing processes and then try to get a main window handle of each (which it may or may not have, and this attempt can throw an exception, so be careful). Here is how:
http://msdn.microsoft.com/en-us/library/1f3ys1f9.aspx[^],
http://msdn.microsoft.com/en-us/library/x8b2hzk8.aspx[^],
http://msdn.microsoft.com/en-us/library/z3w4xdc9.aspx[^],
http://msdn.microsoft.com/en-us/library/system.diagnostics.process.mainwindowhandle.aspx[^] (here, pay attention for the exceptions which can be thrown).

And finally, I'm not sure the whole idea is very useful. You cannot get 100% guarantee that a process or a window you find is exactly the one you really need. Both process and window title can accidentally be the same for some unrelated applications. Besides, you access to a separate process is quite limited, because the processes are well isolated. Chances are, you would need to use Office automation, or something else.

—SA