LB Booster - Handle variables in maphandle

LB Booster

Programming

Liberty BASIC language (Moderator: Richard Russell)

Handle variables in maphandle

« Previous Topic | Next Topic »

Pages: 1

Author

Topic: Handle variables in maphandle (Read 123 times)

Rod
Full Member

member is offline

Gender:

Posts: 110

Re: Handle variables in maphandle
« Reply #2 on: Mar 7^th, 2018, 12:02pm »

Fred is thinking about the #handleVariable concept.

Code:

nomainwin

textbox #t.txt, 20, 40, 260, 25
WindowWidth = 350 : WindowHeight = 190
open "Simple text box" for window as #t
#t "trapclose [quit]"

h$="#t.txt"
#h$ "hello"

new$="#t.txt2"
maphandle #t.txt, #new$ 

#new$ "again"
wait

[quit]
close #t
end

Logged

Richard Russell
Administrator

member is offline

Posts: 1348

Re: Handle variables in maphandle
« Reply #3 on: Mar 7^th, 2018, 12:49pm »

on Mar 7^th, 2018, 12:02pm, Rod wrote:

Fred is thinking about the #handleVariable concept.

It's true that LB is somewhat inconsistent in its handle variable syntax, which is probably what led him astray. When you are accessing a control using a handle variable you must add a hash prefix:

Code:

    #handlevariable$ "Command string"

(this means you effectively have two hashes: an explicit one as shown and another in the handle variable string).

However in the MAPHANDLE statement you must not add a hash prefix to the handle variable:

Code:

    MAPHANDLE #oldhandle, newhandle$

Although this is clearly documented in the LB help file, the inconsistency could usefully be highlighted to reduce the likelihood of mistakes.

Richard.

Logged

k6dgw
New Member

member is offline

Gender:

Posts: 6

Re: Handle variables in maphandle
« Reply #4 on: Mar 12^th, 2018, 9:58pm »

Thank you both! It's always the little things that confuse me.

Logged

Fred
Sparks NV USA

Pages: 1


« Previous Topic \| Next Topic »