FileIOCompletionRoutine

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a115433

Joined: 05 Mar 2010
Posts: 144

a115433 19 Apr 2010, 08:25

I would like to pass argument to this function.
it only takes 3 arguments, but all are from system.
ive noticed that ebx is saved and contain good value inside, can i assume its a fact?
if i cant use register, is it anyway to pass argument, or im stuck with normal io functions + GetOverlappedResult()? I dont like to use fixed globla addreses, all must be related to something. For me if function doesnt take user input argument, i cant use inside if it anything from code, including data and code. No global variables.

is there any way? or this function is broken? or maybe i can extend overlapped structure, it should work, but i doubt ms will support that in future.

19 Apr 2010, 08:25

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20580
Location: In your JS exploiting you and your system

revolution 19 Apr 2010, 08:34

MS doc:

FileIOCompletionRoutine wrote:

Windows does not use the hEvent member of the OVERLAPPED structure; the calling application may use this member to pass information to the completion routine. Windows does not use the OVERLAPPED structure after the completion routine is called, so the completion routine can deallocate the memory used by the overlapped structure.

19 Apr 2010, 08:34

a115433

Joined: 05 Mar 2010
Posts: 144

a115433 19 Apr 2010, 09:23

ok thx, so its 100% legal and wont break my code on older/newer windows?

19 Apr 2010, 09:23

a115433

Joined: 05 Mar 2010
Posts: 144

a115433 20 Apr 2010, 16:07

this is bullshit, you wont find this in official documentation, thus fileiocompletionroutine is broken and should be banned asap.

20 Apr 2010, 16:07

baldr

Joined: 19 Mar 2008
Posts: 1651

baldr 21 Apr 2010, 12:40

a115433,

Do you have any problems reading and/or understanding English?

MSDN wrote:

lpOverlapped [in, out]
…
The ReadFileEx function ignores the OVERLAPPED structure's hEvent member. An application is free to use that member for its own purposes in the context of a ReadFileEx call. ReadFileEx signals completion of its read operation by calling, or queuing a call to, the completion routine pointed to by lpCompletionRoutine, so it does not need an event handle.

21 Apr 2010, 12:40

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