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 Post subject: Listbox entries from text file
PostPosted: October 18th, 2009, 11:35 pm 
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Joined: November 3rd, 2004, 6:44 pm
Posts: 59
Location: Ipswich, UK
I am using the script below to read a series of names held in a text file into a listbox.
This all works very well but there is always an extra blank line at the bottom of the listbox - Is there a way to remove this, or not generate it in the first place?

Regards

Clive Cartmel


********************************************************
var Names = ""

NamesList = OpenFile("StaffSubjects.txt")

while (NamesList.EndOfFile() == false) {
currentfile = NamesList.ReadLine()
Names = Names + currentfile + "\n"
wait()
}

Listbox.SetSelection(0,-1)
Listbox.ReplaceSelection(Names)

********************************************************

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 Post subject:
PostPosted: October 19th, 2009, 12:50 am 
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Godlike
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Joined: November 12th, 2005, 1:56 am
Posts: 1474
Location: SFBay Area
Opus: OpusPro v9.0x, & Evol.
OS: Vista32
System: Core 2 duo 2Ghz, RAM 3GB, Nvidia Go 7700 - laptop
Clive,

Somewhere... there was a basic example of reading text file LINES. Much like you have... but it starts out with the go to First Line and reads that into a variable..
From then on, all the reads populate the displayed text by putting the line return ( \n ) in front of the expression.

maybe:
Names = "\n" + Names + currentfile

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 Post subject:
PostPosted: October 19th, 2009, 12:52 am 
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Godlike
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Joined: November 12th, 2005, 1:56 am
Posts: 1474
Location: SFBay Area
Opus: OpusPro v9.0x, & Evol.
OS: Vista32
System: Core 2 duo 2Ghz, RAM 3GB, Nvidia Go 7700 - laptop
Lar_123 wrote:
Clive,

Somewhere... there was a basic example of reading text file LINES. Much like you have... but it starts out with the go to First Line and reads that into a variable..
From then on, all the reads populate the displayed text by putting the line return ( \n ) in front of the expression.

maybe:
Names = "\n" + Names + currentfile


I'm pretty sure I used that construct in this sample pub:
viewtopic.php?t=3632&highlight=listbox+tickbox

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 Post subject:
PostPosted: October 19th, 2009, 9:02 am 
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Joined: March 21st, 2007, 10:44 am
Posts: 3188
Location: UK
Opus: Evolution
NamesList.EndOfFile() ? Names = Names + currentfile : Names = Names + currentfile + "\n"

Mack

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 Post subject: Listbox entries from text file
PostPosted: October 19th, 2009, 10:23 pm 
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Joined: November 3rd, 2004, 6:44 pm
Posts: 59
Location: Ipswich, UK
Thanks for both of your suggestions.

Mack, yours looks very interesting, but could I push you to a little more clarity as to how I implement it with my script?

What does the ? do?

Thanks in anticipation.

Regards

Clive Cartmel

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 Post subject:
PostPosted: October 19th, 2009, 10:31 pm 
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Joined: March 21st, 2007, 10:44 am
Posts: 3188
Location: UK
Opus: Evolution
Hi Clive,

It's a conditional operator - basically a smart if-then-else.

Use it in place of your current concatenation:

Names = Names + currentfile + "\n"

It will check the condition of the end-of-file and select the appropriate response - IE concat with new line or concat without new line.

Regards,

Mack

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 Post subject: Thanks
PostPosted: October 20th, 2009, 5:42 pm 
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Joined: November 3rd, 2004, 6:44 pm
Posts: 59
Location: Ipswich, UK
Mack,

Many thanks for the explanation - it works perfectly.
I assume that this is another of those undocumented features that could save us a great deal of time if we knew about them?
I can now go and tidy up a number of publications that had this annoying little feature in the past.

Thanks once again.

Clive

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 Post subject: Re: Thanks
PostPosted: October 20th, 2009, 6:43 pm 
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Godlike
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Joined: March 21st, 2007, 10:44 am
Posts: 3188
Location: UK
Opus: Evolution
Clive Cartmel wrote:
I assume that this is another of those undocumented features that could save us a great deal of time if we knew about them?


No, not really. The Conditional Operation is merely a useful way of writing this. It could just as easily have been written with the if-else which has been around since day dot and is well documented. :-)

The undocumented would be to use an array and join which is oddly missing despite its sister the split turning up from strings.

Opus Script is basically JavaScript (<=1.2) and there are many books out there that give useful examples. But credit where credit is due - DW have covered a phenomenal amount of fundamental programming through their examples and help guide.

Mack

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