MID$() = variable

[Stan Helton]

Using PB/DOS 3.5 in MS-DOS 6.22 environment.

The MID$() statement does not appear to work as described in the manual.

Syntax as follows:

MID$(DataRecord$, Offset%, Length%) = StringVariable$

is supposed to insert Length% characters of StringVariable$ into DataRecord$
at Offset%, but it doesn't work. It seems to return a NULL string. Offset%
and Length% are NonZero Positive integers.

Is there a problem with this syntax? So far, I've been using a FOR/NEXT loop
as a workaround, but I would really like to be able to use this syntax as
described in the manual.

Thanks,
Stan

[Michael Mattias]

Post by Stan Helton
Using PB/DOS 3.5 in MS-DOS 6.22 environment.
The MID$() statement does not appear to work as described in the manual.
MID$(DataRecord$, Offset%, Length%) = StringVariable$
is supposed to insert Length% characters of StringVariable$ into DataRecord$
at Offset%, but it doesn't work. It seems to return a NULL string. Offset%
and Length% are NonZero Positive integers.

MID$ has worked correctly forever. Show allegedely failing code. Also which
compiler? Windows or DOS? (Looks like MS-DOS from use of integer vars?)

Also, if you are gettring NUL string back in DataRecords$, ERR should be
set, you can test that.

[usablevirus]

Post by Stan Helton
Using PB/DOS 3.5 in MS-DOS 6.22 environment.
The MID$() statement does not appear to work as described in the manual.
MID$(DataRecord$, Offset%, Length%) = StringVariable$
is supposed to insert Length% characters of StringVariable$ into
DataRecord$ at Offset%, but it doesn't work. It seems to return a NULL
string. Offset% and Length% are NonZero Positive integers.
Is there a problem with this syntax? So far, I've been using a
FOR/NEXT loop as a workaround, but I would really like to be able to
use this syntax as described in the manual.

LEN(StringVariable$) must equal Length%
also (Offset% + Length%)-1 must not exceed the LEN(DataRecord$)

[Stan Helton]

Post by usablevirus

Post by Stan Helton
Using PB/DOS 3.5 in MS-DOS 6.22 environment.
The MID$() statement does not appear to work as described in the manual.
MID$(DataRecord$, Offset%, Length%) = StringVariable$
is supposed to insert Length% characters of StringVariable$ into
DataRecord$ at Offset%, but it doesn't work. It seems to return a NULL
string. Offset% and Length% are NonZero Positive integers.
Is there a problem with this syntax? So far, I've been using a
FOR/NEXT loop as a workaround, but I would really like to be able to
use this syntax as described in the manual.

LEN(StringVariable$) must equal Length%
also (Offset% + Length%)-1 must not exceed the LEN(DataRecord$)

Thanks. I will test that this afternoon and let you know what happens.
Question -- Is it not possible to use this statement to insert only a
portion
of StringVariable$ into DataRecord$ by specifying
a Length% < LEN(StringVariable$) ?

[Michael Mattias]

Post by Stan Helton
Thanks. I will test that this afternoon and let you know what happens.
Question -- Is it not possible to use this statement to insert only a
portion
of StringVariable$ into DataRecord$ by specifying
a Length% < LEN(StringVariable$) ?

Sure, just use MID$ function in addition to MID$ startement...

MID$(string, pos, len) = MID$(Otherstring, pos, length)

???


MCM

[Stan Helton]

Post by Michael Mattias

Post by Stan Helton
Thanks. I will test that this afternoon and let you know what happens.
Question -- Is it not possible to use this statement to insert only a
portion
of StringVariable$ into DataRecord$ by specifying
a Length% < LEN(StringVariable$) ?

Sure, just use MID$ function in addition to MID$ startement...
MID$(string, pos, len) = MID$(Otherstring, pos, length)
???
MCM

Thanks, that pretty well solves my delimma and cleans up the code I was
trying use also.

Stan

[Tom Lake]

Post by Stan Helton
Using PB/DOS 3.5 in MS-DOS 6.22 environment.
The MID$() statement does not appear to work as described in the manual.
MID$(DataRecord$, Offset%, Length%) = StringVariable$
is supposed to insert Length% characters of StringVariable$ into DataRecord$
at Offset%, but it doesn't work. It seems to return a NULL string. Offset%
and Length% are NonZero Positive integers.

cls
a$="This ir a statement."
print a$
mid$(a$,7,1)="s"
print a$

does this:

This ir a statement.
This is a statement.

This is how MID$ works.

Tom Lake