How do you know file is an invalid handle? For example 0x1 is neither 0 nor > INVALID_HANDLE_VALUE, but can it be a valid handle? > Depends on the application. >=20 I think Mr Skywing has already dealt the death When the handle is a pipe, it can be closed by the other party. (and is invalidated by the other party). Invalid_handle_value Header If it is a different thread of the same program, ya, it is possible.
Upcoming OSR Seminars: Developing File Systems for Windows, Vancouver, BC 7-10 November, 2016 Windows Internals and Software Driver Development Lab, Nashua (Amherst), NH 14-18 November, 2016 Kernel Debugging and Crash Analysis My kids watch Youtube, how to monitor what they see? How do you keep clean on long, pre-industrial journeys? Under Windows 98, CreateFile sometimes returned INVALID_HANDLE_VALUE and sometimes returned NULL (and sometimes returned valid handles :-) I did not try to reproduce it under Windows XP, but continue to code
Is it mandatory to define transitions on every possible alphabet in Deterministic Finite Automata? Meaning of "Sue me" Is the Tate-Shafarevich group of a rational elliptic curve finite? Windows Invalid_handle_value Is there a way to have pi in a CSS calc? Check If Handle Is Valid C++ If you've written your software well, with decent use of abstraction and information-hiding, and evaluate your maintenance fixes correctly, you can vary the implementation behind your interfaces without affecting the client
Downloads and tools Windows 10 dev tools Visual Studio Windows SDK Windows Store badges Essentials API reference (Windows apps) API reference (desktop apps) Code samples How-to guides (Windows apps) Learning resources this contact form Thanks James Message 2 of 27 23 Oct 1003:46 ntdev member 45059 [email protected] Join Date: Posts To This List: 320 what is an invalid HKEY? up vote 0 down vote favorite I have CreateFile() to create a hidden file type but the problem that it keeps returning invalid handle. Shatskih Windows DDK MVP [email protected] http://www.storagecraft.com Message 21 of 27 24 Oct 1007:26 Maxim S. Win32 Invalid_handle_value
Issues? If your handles are being closed from another process, I assume that you are the one doing that, and you need to deal with the book keeping. Sorry, no idea _________________Martin Prikryl kshv Guest Posted: 2006-04-07 21:35 Invalid Handle [Reply with quote] Thanks for your time. http://toriisoft.com/invalid-handle/invalid-handle-value.html The correct error checking for your code should be something more like...
Axiom - philosophy of math Is there an optional or house rule for effectiveness of specific weapons versus specific armor types? Invalid_handle_value C++ Norman Diamond says: March 2, 2004 at 6:30 pm To use an HFILE, one must call the 16-bit compatibility function OpenFile. This is observed with Winscp alone.
Updating the VShell server to latest version didn't make any difference. if (some error condition) goto cleanup ... Raymond Chen says: March 2, 2004 at 6:35 pm Because that's what CloseHandle and ReadFile and WriteFile use. Check This Out If it returned 1 it means the pipe is open, else I opened it using the CreateFile again.
Soldier mentioned in War Dogs I got a paper to review from a journal that had rejected my earlier works, how to respond? How to read the following Itinerary C++ - Error with ranged for inside function What does "I've eaten myself stupid" mean? Once you make a guarantee that strong you don't need a "check handle" function. –janm Jan 5 at 11:19 Not quite true. Reading the value sooner fixed the problem.
The problem is that once a handle has been closed, the same handle value can be generated by a new open of something different, and your test might say the handle So, if it is your process, you need to keep track of which handles are valid and which ones are not. Yet through careful programming, check handle should still be possible. (Well, the program needs to make sure to put a check point where a handle is possibly created. Use ReadFile and WriteFile.
Maybe when creating new kind of handles, one should ensure that valid values cannot be either 0 or -1. OSR, the Windows driver experts. Answer: Yes, OpenFile would have been a better name, but that name was already taken.) On the other hand, there are no Win16 equivalents for CreateThread or CreateMutex, so they return To get extended error information, call GetLastError.
registry key opening functions will return "INVALID_HANDLE_VALUE" if they fail. It would be specific to today's implementation to assume INVALID_HA= NDLE_VALUE is also outlawed (though this is admittedly a pedantic and likel= y academic point; the usage of the output key Shatskih"