Logical AND and variables

[Eric Kelderman]

Hi

Very interesting:

DIM Var1 as WORD
Var1 = 12338

MSGBOX STR$(Var1 And 255) Result --> 28
MSGBOX STR$(12338 And 255) Result --> 50 << this is what I expect

Thanks

Eric Kelderman


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[Eric Pearson]

Eric --

I get 50 and 50. Which compiler are you using? Which version?

-- Eric


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[Lance Edmonds]

I get 50 too...

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Lance
PowerBASIC Support
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[Eric Kelderman]

Eric

I see I wasn't complete.
The actuall variable def was a word array where Var1(0) == 12338

If I do (Var1(0) And 255) I get 28, sometimes 68 ???

If I do:
Dim I as Word
I = Var1(0)
I and 255 the result is 50...

I'm confused but it works.
Could it be that the brackets in the array causes miscalculation?

I use PB6, July 2 1999 Exe date.

Thanks
Eric




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[Eric Kelderman]

OK

Once again now a bit closer to the real problem which includes a pointer too

TYPE M1S
M1Data(0 TO 56) AS WORD
END TYPE

===== This is fine


FUNCTION GetMemoLicense() EXPORT AS INTEGER

DIM I1 AS WORD, I2 AS WORD
DIM M1Struct AS M1S

M1Struct.M1Data(0) = 12338

I1 = m1struct.m1data(0)
I2 = I1
I1 = (I1 AND 255)
MSGBOX CHR$(I1)+STR$(I2)+STR$((I2-I1)/256)

END FUNCTION


===== I2 is getting different values from I1 immediatly after assigning the value I2 = I1


FUNCTION GetMemoLicense() EXPORT AS INTEGER

DIM P1 AS LONG, P2 AS LONG, P3 AS LONG, P4 AS LONG
DIM I1 AS WORD, I2 AS WORD
DIM M1Struct AS M1S

P1 = 0
P2 = 56
P4 = VARPTR(M1Struct)
CALL Hasp(50, 0, 0, PLa, PLb, P1, P2, P3, P4) <<-- P4 = Pointer to M1Struct

I1 = m1struct.m1data(0) <<-- How do I get reliable data from M1Struct ?????
I2 = I1
I1 = (I1 AND 255)
MSGBOX CHR$(I1)+STR$(I2)+STR$((I2-I1)/256)
|--- This I2 is 6952 ???..??? I expected 12338

END FUNCTION




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[Tom Hanlin]

Seems fine here. Perhaps there is a problem with the Hasp call?

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Tom Hanlin
PowerBASIC Staff

[Michael Mattias]

P4 = VARPTR(M1Struct)
CALL Hasp(50, 0, 0, PLa, PLb, P1, P2, P3, P4) <<-- P4 = Pointer to M1Struct

Most (all I've seen) pointers are passed BY VALUE.

In the absence of a DECLARE or the procedure header for Hasp using a "BYVAL P4", the call line shown will pass the ADDRESS of P4, not the value.

Either try a declare, or use

CALL Hasp(50, 0, 0, PLa, PLb, P1, P2, P3, BYVAL P4) <<-- P4 = Pointer to M1Struct

You might check the rest of the parameters for BYVAL, BYREF etc.