open file

[robm80]

I want to know if "foo.jpg is in "d:\Livecode\thumbnails".
This is the script:

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open file "d:\Livecode\thumbnails"
read from file ("d:\Livecode\thumbnails\") until EOF
if  "foo.jpg" is in it then
answer "eureka"
end if

but nothing happens.
What is the right script

Thanks, Rob

[Simon]

Hi Rob,
if there is a file "d:\Livecode\thumbnails\foo.jpg" then answer "eureka"

Simon

[robm80]

Thanks Simon,
but still I am missing something:

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put "foo" into tVar
 if there is a file "D:/Livecode/thumbnails/"&tVar&".jpg" then 
answer "eureka"
else
answer "nope"
end if

There is a foo.jpg in that map, but the answer is "nope".

[Klaus]

Hi Rob,

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open file "d:\Livecode\thumbnails"
read from file ("d:\Livecode\thumbnails\") until EOF
if  "foo.jpg" is in it then
answer "eureka"
end if

you KNOW that "thumbnails" is in fact a folder but you try to handle it as a FILE?
What did you exspect?

When concatenating STRINGS (file and/or object names) you need to use PARENTHESIS!

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put "foo" into tVar
if there is a file ("D:/Livecode/thumbnails/" &t Var & ".jpg") then 
answer "eureka"
 else
answer "nope"
end if

That is because the engine will first evaluate the string INSIDE of the parens and will fail if there a no parens!
In your case teh engines stop at teh first expression and then stops, so this line:

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if there is a file "D:/Livecode/thumbnails/" &t Var&".jpg" then 

will only evaluate to this:

Code: Select all

if there is a file "D:/Livecode/thumbnails/" then

Best

Klaus

[robm80]

Understood, thanks. Rob