CVMS CVMD MKMS$ MKMD$ read these files from .Net

[Basit Bulbulia]

CVMS CVMD MKMS$ MKMD$ read these files from .Net

Hi !

I am busy on a project (VB .Net) to read data files from my old PB programs and I can't seem to be able to read the numeric values from my random files.

Does anyone have an idea as to how to read a record that has stored data using MKMD$ MKI$ MKMS$.

How are these files converted and stored in PB, I know interger is 2 bits, cvms is 4 bits etc but what is behind the conversion . .


Hope someone can assist

Bye Now
www.compubyte.co.za/dev.htm

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JustBASit

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www.compubyte.co.za
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[Marco Pontello]

Basit,
check this link:
DevX.com - MK? And CV? - Convert numbers to strings and back

Bye!

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[Tom Hanlin]

I can't see where there ought to be a problem. The binary numeric
formats are perfectly standard. VB.Net ought to be able to handle
them directly.

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Tom Hanlin, PowerBASIC Staff
Opinions expressed may not be those of my employer or myself

[Basit Bulbulia]

Thanks Marco ! Thanks Tom !

Tom when you say "standard" and "directly" . . what do you exactly mean?

If I were to read 4 bits of a string (These 4 bits represent CVmS/MKmS$ data written from PowerBasic)
How would .Net interpret this string?

I think the problem is that I really dont understand how PowerBasic converts
the numeric value Eg:1000.99 into a four bit string, while I understand that the MKMS$ function does this in powerbasic how does it do this?? (ummm the code behind the function?)

Thanks



------------------
JustBASit

-------------------
www.compubyte.co.za
------------------- [email protected]

[Michael Mattias]

>CVMS CVMD MKMS$ MKMD$ read these files from .Net...
>The binary numeric formats are perfectly standard. VB.Net ought to be able to handle them directly.

I don't think so....

The CVMS, CVMD an corresponding MKMS$ and MKMD$ functions convert to/from the Microsoft "MBF" format data, whereas most software created after 1990 uses IEEE format. PB/DOS goes back and forth between IEEE numeric and string with MKS$, MKD$, CVS and CVD (note no "M" in the function names).

I think you'll need to convert from MBF to IEEE to use those data with anything.net

MCM

[Tom Hanlin]

CVMS and CVMD do not relate to standard numeric formats. They're used
for converting from antiquated Microsoft formats. There's code in the
libraries for dealing with them. See MSBF.zip here:

http://www.powerbasic.com/files/pub/pbwin/misc/


If you're dealing with normal binaries, though, the solution is just
to input into an appropriate UDT (user-defined type) rather than a
string. The results will convert automatically or, more exactly, are
already in the correct state. That is, if a member of the type is
SINGLE, and you're reading in a single-precision value, there's no
conversion that needs to be made. A SINGLE is a SINGLE regardless of
what produced it, unless you're going back to ancient Microsoft DOS
compilers... in which case, you may need the MSBF conversion, above.

PowerBASIC is also very flexible about putting strings into UDTs, or
vice versa. See LSET, RSET, and CSET.

Thank you for setting me up, Michael. Your serve, I believe.

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Tom Hanlin, PowerBASIC Staff
Opinions expressed may not be those of my employer or myself