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"File Path Control" default Value

Hi - How do we set or change the default value for "File Path Control" (Control --> String & Path ---> File Path Control)?

 

I typed the default path into the control field on the front pannel and save the VI file.  The value gone when I reopen the file.

 

 

 

 

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Message 1 of 19
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Right click on the control, go to Data Operations>>Make Current Value Default

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Message 2 of 19
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How do we set to NOT valid the path value?

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Message 3 of 19
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I would drop a Not A Path constant on the BD, right-click and Change to Control.  The default value is now set for you.

 

If you use Modern controls you can click on the % glyph and choose Not A Path, but I use System controls so that is why I go the constant route (plus the auto default setting is nice)

Message 4 of 19
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By the way, I realize I never paid attention that there's a difference between Not a path and Empty path... Why?

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Message 5 of 19
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@Jimmy.chretien wrote:

[...] difference between Not a path and Empty path... Why?


Not a Path is a specific value for the path (<Not a Path>).

Developers should use this to prevent situations in applications, where a user has to select a path before performing an action (e.g. saving a file). If the user skips the path selection, the application still has "Not a Path" and can prevent errors and tell the user to select the path (error handling!).

 

Norbert

Norbert
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Message 6 of 19
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If it returns empty path, the developer can easilly do the same error handling, I don't see the point....

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Message 7 of 19
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@Jimmy.chretien wrote:

If it returns empty path, the developer can easilly do the same error handling, I don't see the point....


Not as easilly since an empty path returns F for the comparison

Capture.PNG


"Should be" isn't "Is" -Jay
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Message 8 of 19
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@Jimmy.chretien wrote:

If it returns empty path, the developer can easilly do the same error handling, I don't see the point....


The empty path on Mac/Linux is the root of the file system.  When you write paths such as /path/path it is actually (empty)/path/path.  The upshot is that the empty path is perfectly valid on those systems and not really a useful sentinel value.  <Not A Path> is such a sentinel.

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Message 9 of 19
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There is a "Empty String/Path?" function in LabVIEW.

@JÞB wrote:

@Jimmy.chretien wrote:

If it returns empty path, the developer can easilly do the same error handling, I don't see the point....


Not as easilly since an empty path returns F for the comparison

Capture.PNG


 

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Message 10 of 19
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