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


Any ideas? HELP!

problem solved, nt 3.1 io doesnt accept manual reset events. And pointer bytestransferred is not optional even in overlapped mode.

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.

Why are you coding against NT 3.1? Just curious, that version is over 15 years old