another question about files

[Antoni Gual]

Knowing you too have the manual reassures me. This gives us a safety net in case Glenn's manual is destroyed by some catastrophe.

[Moneo]

The manual that I have is MS Quickbasic 4.0. I found it more informative than 4.5, 5.0, etc. manuals that I had. I also have a GW-Basic manual which I seldom use anymore.
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[relsoft]

Man!!! Where do you get those manuals????

Error codes especially at compile time. ;*)

Re: Seek. How does it work? I mean I've used it extensively but I don't knoe the low-level stuff.

I would like to assume it does this:

INT21h...

Openfile

Mov cx, byte displacement
then
read sequentially until it hits the offset.

Pls. tell me if I'm wrong.

Glenn, Moneo?

[Glenn]

"reads sequentially until it hits the offset". What offset? SEEK just positions the file pointer, which is what determines where file I/O functions access the file at. (I would imagine that SEEK simply uses the DOS function of INT 21 that positions file pointers.)

[Moneo]

Manuals: Some I actually bought. Some I asked for when the company was throwing them out. This is pretty common. You may end up with an older manual, but it's better than none.

I don't understand what you mean about the error codes at compile time. If you mean looking up the error codes in the manual, well, I never have to resort to the manual for this. Usually the compiler error message is sufficient.

I honestly don't know the internals of how the SEEK works. If you're really interested, write a little prog that does SEEK, and look at the guts with DEBUG.
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