Hi to all.
I'm new to this ng. And i'm almost new to btrieve programming.
The question.
I'm trying to get data from a Btrieve database(6.15) from within a VB.net
module. I use:
DECLARE FUNCTION BTRCALL LIB "Wbtrv32.dll" (Byval oc as ushort, byval pb as
string, <Marshalasattribute(unmanagedtype.asany)> byval Db as object, byval
Dl as integer, byval Kb as string, <Marshalasattribute(unmanagedtype.asany)>
byval Kl as object, byVal Kn as char) as integer

when I call the function as follow:
status = BTRCALL(B_Open, Pblock, DataBuf, BufLen, KeyBuf, KeyBufLen, "0")
where:
B_Open is a costant = 0
PBlock is a space(128)
DataBuf as RecordBuffer
buflen as integer
keybuf = Filename (C:\Ex\Data.btr")
keybuflen = space(255)

What I get when it starts is an error referring to keybuflen which "attempts
to read or write a protected memory area".
Where is the problem?
thanks in advance

"Enzo" <mmm (AT) mmm (DOT) it> wrote

KeyBufLen is a numeric, specifically, the length of your KeyBuf string.

Have changed to Int64 both the declaration and the variable and still have
the same error.
(Begging your pardon for my incopetence I'm relatively new in programming
vb.net, by now I have written in VBA)
thanks again for your help
DECLARE FUNCTION BTRCALL LIB "Wbtrv32.dll" (Byval oc as ushort, byval pb as
string, <Marshalasattribute(unmanagedtype.asany)> byval Db as object, byval
Dl as integer, byval Kb as string, <Marshalasattribute(unmanagedtype.I8)>
byval Kl as Int64, byVal Kn as char) as integer


P.S. I'm trying to follow istructions written in a btrieve manual Pervasive
have posted on their site.

"Enzo" <mmm (AT) mmm (DOT) it> wrote

Without checking, I believe the key buffer length parameter should be a
short integer, but possibly a long integer. Definitely not a 64-bit
integer, though.

It most definitely should be an integer.

Declare Function btrcall Lib "wbtrv32.dll" (ByVal Op% AS Integer, ByVal
Pb$, Db As Any, DL% AS Integer, Kb As Any, ByVal Kl% AS Integer, ByVal
Kn% AS Integer) AS Integer

Of course, nobody was worried about 64-bit integers in 1994 when this
product was released.
BB

Frisbee. wrote: