Getting other processes class names

Hawkin · 03-20-2008, 07:56 AM

Hi again,

I am sort of stuck with detecting if a specific process is running.

My sample program is registered with class name "#32770" (a string), and for testing I know the PID.

Code:

HANDLE phandle = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
GetClassName(phandle, classbuf, MAX_PATH);

Using this I get different phandles everytime I call OpenProcess (yeah I do CloseHandle() them).

Here's a log:

Quote:

Error: 0. PID: 3764. classbuf: RICHEDIT. Handle: 248.
Error: 0. PID: 3764. classbuf: Static. Handle: 284.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 300.
Error: 0. PID: 3764. classbuf: Button. Handle: 312.
Error: 0. PID: 3764. classbuf: Static. Handle: 292.
Error: 0. PID: 3764. classbuf: Static. Handle: 316.
Error: 0. PID: 3764. classbuf: Static. Handle: 324.
Error: 0. PID: 3764. classbuf: RICHEDIT. Handle: 296.
Error: 0. PID: 3764. classbuf: RichEdit20A. Handle: 340.
Error: 0. PID: 3764. classbuf: Static. Handle: 348.
Error: 0. PID: 3764. classbuf: RichEdit20A. Handle: 364.
Error: 0. PID: 3764. classbuf: Static. Handle: 356.
Error: 0. PID: 3764. classbuf: Button. Handle: 372.
Error: 0. PID: 3764. classbuf: Static. Handle: 376.
Error: 0. PID: 3764. classbuf: RICHEDIT. Handle: 388.
Error: 0. PID: 3764. classbuf: Afx:00400000:0. Handle: 404.
Error: 0. PID: 3764. classbuf: CiceroUIWndFrame. Handle: 396.
Error: 0. PID: 3764. classbuf: CicMarshalWndClass. Handle: 412.
Error: 0. PID: 3764. classbuf: Edit. Handle: 424.
Error: 0. PID: 3764. classbuf: Static. Handle: 380.
Error: 0. PID: 3764. classbuf: SystemTray_Main. Handle: 440.
Error: 0. PID: 3764. classbuf: Button. Handle: 444.
Error: 0. PID: 3764. classbuf: #32770. Handle: 452.
Error: 0. PID: 3764. classbuf: Static. Handle: 464.
Error: 0. PID: 3764. classbuf: Xprt Message Window. Handle: 436.
Error: 0. PID: 3764. classbuf: RichEdit20A. Handle: 308.
Error: 0. PID: 3764. classbuf: Static. Handle: 484.
Error: 0. PID: 3764. classbuf: Button. Handle: 496.
Error: 0. PID: 3764. classbuf: msctls_progress32. Handle: 460.
Error: 0. PID: 3764. classbuf: Static. Handle: 492.
Error: 0. PID: 3764. classbuf: Static. Handle: 516.
Error: 0. PID: 3764. classbuf: Static. Handle: 524.
Error: 0. PID: 3764. classbuf: Static. Handle: 532.
Error: 0. PID: 3764. classbuf: Static. Handle: 540.
Error: 0. PID: 3764. classbuf: KHALMainProcessWindow. Handle: 552.
Error: 0. PID: 3764. classbuf: KHALUSB_MainWindow. Handle: 556.
Error: 0. PID: 3764. classbuf: KHALMouseware_MainWindow. Handle: 548.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 572.
Error: 0. PID: 3764. classbuf: Afx:400000:0. Handle: 584.
Error: 0. PID: 3764. classbuf: Afx:400000:0. Handle: 588.
Error: 0. PID: 3764. classbuf: Button. Handle: 596.
Error: 0. PID: 3764. classbuf: Button. Handle: 608.
Error: 0. PID: 3764. classbuf: Button. Handle: 612.
Error: 0. PID: 3764. classbuf: KHALMOU_MainWindow. Handle: 564.
Error: 0. PID: 3764. classbuf: URL Moniker Notification Window. Handle: 580.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 636.
Error: 0. PID: 3764. classbuf: IME. Handle: 660.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 664.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 644.
Error: 0. PID: 3764. classbuf: OleMainThreadWndClass. Handle: 672.
Error: 0. PID: 3764. classbuf: Afx:400000:803:1001f:0:0. Handle: 676.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 652.
Error: 0. PID: 3764. classbuf: Afx:400000:0. Handle: 692.
Error: 0. PID: 3764. classbuf: KodiakHiddenWndClass. Handle: 684.
Error: 0. PID: 3764. classbuf: #32770. Handle: 712.
Error: 0. PID: 3764. classbuf: KodiakHiddenWndClass. Handle: 700.
Error: 0. PID: 3764. classbuf: SkinWnd. Handle: 708.
Error: 0. PID: 3764. classbuf: SysListView32. Handle: 736.
Error: 0. PID: 3764. classbuf: Internet Explorer_Hidden. Handle: 724.
Error: 0. PID: 3764. classbuf: SysHeader32. Handle: 732.
Error: 0. PID: 3764. classbuf: Button. Handle: 760.
Error: 0. PID: 3764. classbuf: SysHeader32. Handle: 748.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 776.
Error: 1400. PID: 3764. classbuf: î‘|8’|ÿÿÿÿ2’|«’|ë’|. Handle: 668.
Error: 0. PID: 3764. classbuf: Button. Handle: 756.
Error: 0. PID: 3764. classbuf: #32770. Handle: 800.
Error: 0. PID: 3764. classbuf: MozillaDropShadowWindowClass. Handle: 804.
Error: 0. PID: 3764. classbuf: Internet Explorer_Server. Handle: 812.
Error: 0. PID: 3764. classbuf: tooltips_class32. Handle: 788.
Error: 0. PID: 3764. classbuf: Shell Embedding. Handle: 832.

Every call to OpenProcess invokes strange behaviour IMO. phandle returns raising numbers, sometimes the function even fails (Error 1400 = "Invalid window handle.") and sometimes it returns a handle which gives me the class name I have registered.

Is this the wrong way to get the class name of other processes? If I knew the class name (which I do actually) I could check with FindWindow() if the process is running - but that would cause me problems if there are multiple instances of the process, wouldn't it?

Thanks in advance, Hawk

Codeplug · 03-20-2008, 09:04 AM

You are mixing "handle" types. OpenProcess() returns a HANDLE to a process. GetClassName() requires a "handle" to a window of type HWND.

gg

Hawkin · 03-20-2008, 11:22 AM

How do I enumerate the HWNDs of a process then?

Codeplug · 03-20-2008, 04:02 PM

You could enumerate all windows and use GetWindowThreadProcessId() to see if it belongs to a particular process.

>> am sort of stuck with detecting if a specific process is running.
>> ...and for testing I know the PID
What exactly are you trying to do?

gg

03-20-2008, 09:04 AM	#2
Codeplug Registered User Join Date: Mar 2003 Posts: 3,844	You are mixing "handle" types. OpenProcess() returns a HANDLE to a process. GetClassName() requires a "handle" to a window of type HWND. gg
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03-20-2008, 04:02 PM	#4
Codeplug Registered User Join Date: Mar 2003 Posts: 3,844	You could enumerate all windows and use GetWindowThreadProcessId() to see if it belongs to a particular process. >> am sort of stuck with detecting if a specific process is running. >> ...and for testing I know the PID What exactly are you trying to do? gg
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03-20-2008, 11:22 AM	#3
Hawkin Registered User Join Date: Aug 2006 Posts: 44	How do I enumerate the HWNDs of a process then?
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