Really fundamental instance puzzle

[Keith Waters]

Take a very simple program, such as the HELLO.BAS program supplied
with PBDLL 6 in the SAMPLES directory. Add the line,

msgbox str$(curInst)

where curInst is the first parameter passed to WinMain. Compile
and then run n (n > 1) instances of the program. I get n message
boxes all saying 4194304. I thought the current instance handle
value should be different for each instance of a program. Why
are mine all the same?

Keith Waters


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[Semen Matusovski]

This could be a puzzle for Win16 developers only.
Under Win32 all processes are independent and address x in process 1 doesn't have the same phisical location as address x in process 2.

Numeration of addresses begins from 0 in each process.
Because a set of modules, which OS automatic loads in each process, is "permanent", an address of started program is also fixed.

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[Keith Waters]

Thanks Semen

I realise you have put your finger exactly on the truth. It's
just that I had been confused by Petzold's statement in his book,

"Each copy is called an 'instance", and each has a different
hInstance value."

Thanks again for your reply.

Keith

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[This message has been edited by Keith Waters (edited January 27, 2001).]