string command

[EdmondDantes]

Hello gents, I would like to ask how I can give or not a command with a string (text): if I enter (or select)  'OK' my subVI will run, if I enter (or select) 'FAILURE' my subVI will not execute its tasks. Thanks in advance.

[GerdW]

Hi Edmond,

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@EdmondDantes wrote:

if I enter (or select)  'OK' my subVI will run, if I enter (or select) 'FAILURE' my subVI will not execute its tasks.

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In LabVIEW a case structure is used to implement this typical pseudocode:

IF condition THEN
  do something
ELSE
  do something different
ENDIF

[EdmondDantes]

I understand, but a user (who knows the result of an external test,but who doesn't know how my VI works) is supposed to select or to text "OK" or "FAILURE" and according to this condition a subVI will execute or not.

So, can the condition of this case structure be a string or a select of "OK" or "FAILURE"?

[GerdW]

Hi Edmond,

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@EdmondDantes wrote:

So, can the condition of this case structure be a string or a select of "OK" or "FAILURE"?

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Why don't you read the LabVIEW help for case structures? It explains all datatypes the case structure can handle at its selctor input…

[EdmondDantes]

ok, THANKS.

May I just ask you how to create a control display that can make me select 'OK' or 'FAILURE', so that I can send the condition to the case structure. I tried with text ring control and with combobox control but I didn't success.

[GerdW]

Hi Edmond,

create a boolean button, then enable booelan text for both states, then use "OK" and "FAILURE" for boolean text…

[daveTW]

Hello Endmond,

what and how did you do so far? Can you attach a (simplified) VI showing your not working solution?

[EdmondDantes]

I cannot attach the subVI, but I can explain in details the situation:

I'm dealing with some tests, if the test successes (and the user knows it), the user has to enter or select 'OK' (as a text/string) and then, through the case structure, I will tell the subVI to not execute cause it is not needed.

On the other hand, if the test fails I have to calculate with this subVI some parameters: the user has to enter or select 'FAILURE' to tells the subVI to execute. 

But I'm not familiar with string, so I cannot how to manage boolean text and stuff. I have the clear idea in my mind, but I don't know how to move the first steps. 

[GerdW]

Hi Edmond,

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@EdmondDantes wrote:

the user has to enter or select 'OK'  …  if the test fails … the user has to enter or select 'FAILURE' to tells the subVI to execute.

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Put two buttons on your frontpanel and label them "OK" and "FAILURE". The user clicks one of them.

Use an event structure to detect which button is pressed…

[RavensFan]

I would recommend looking at the online LabVIEW tutorials
LabVIEW Introduction Course - Three Hours
Learn LabVIEW