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Index > Windows > nt 3.1 OVERLAPPED io

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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
Why in this windows overlapped io isnt working? I open file with FILE_FLAG_OVERLAPPED, it succeed, but then ReadFile/WriteFile either return 1, or app crash if i put transferred = null (overlapped is never null).
ReadFileEx/WriteFileEx always return 1, but no data is transferred and apc is never queued.

Why such things happen? I believed that nt has a decent kernel, and only dos based line will have such problems, but here we go Sad


Any ideas? HELP!
Post 19 Apr 2011, 03:15
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
problem solved, nt 3.1 io doesnt accept manual reset events. And pointer bytestransferred is not optional even in overlapped mode.
Post 21 Apr 2011, 18:11
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b1528932



Joined: 21 May 2010
Posts: 287
b1528932
Actually, its only numberofbyteswritten and overlapped must be aligned on 4 bytes. Event can be both types.

I guess alignment is required because IO_STATUS_BLOCK might be passed directly, and kernel require alignment.

But manual suck, it says that only 1 overlapped or numoftransfered is mandatory. On nt 3.1 both are.
Post 21 Apr 2011, 19:27
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comrade



Joined: 16 Jun 2003
Posts: 1137
Location: Russian Federation
comrade
Why are you coding against NT 3.1? Just curious, that version is over 15 years old
Post 19 Jun 2011, 11:38
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typedef



Joined: 25 Jul 2010
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typedef
comrade wrote:
Why are you coding against NT 3.1? Just curious, that version is over 15 years old
Post 19 Jun 2011, 15:18
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