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Topic: Handle variables in maphandle (Read 118 times) |
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k6dgw
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Handle variables in maphandle
« Thread started on: Mar 6th, 2018, 10:47pm » |
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Are handle variables valid in maphandle?
textbox #X.tmp, x, y, w, h
newh$="#Win.rc"+str$(row)+str$(col)
maphandle #X.tmp #newh$
gives me a type mismatch on the maphandle line
Fred
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Fred
Sparks NV USA
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Richard Russell
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Re: Handle variables in maphandle
« Reply #1 on: Mar 7th, 2018, 08:33am » |
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on Mar 6th, 2018, 10:47pm, k6dgw wrote:| Are handle variables valid in maphandle? |
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Of course; in fact MAPHANDLE would hardly be useful at all if that wasn't the case. The error in your code is that you have a spurious hash symbol prefixing the second parameter; it should be:
Code: textbox #X.tmp, x, y, w, h
newh$="#Win.rc"+str$(row)+str$(col)
maphandle #X.tmp, newh$
The two forms of MAPHANDLE are:
Code: MAPHANDLE #oldhandle, #newhandle
MAPHANDLE #oldhandle, newhandle$
Richard.
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Rod
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Re: Handle variables in maphandle
« Reply #2 on: Mar 7th, 2018, 12:02pm » |
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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
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Richard Russell
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Re: Handle variables in maphandle
« Reply #3 on: Mar 7th, 2018, 12:49pm » |
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on Mar 7th, 2018, 12:02pm, Rod wrote:| Fred is thinking about the #handleVariable concept. |
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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.
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k6dgw
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Re: Handle variables in maphandle
« Reply #4 on: Mar 12th, 2018, 9:58pm » |
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Thank you both! It's always the little things that confuse me. 
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Fred
Sparks NV USA
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