LabVIEW
Button does not pop up
A latch action boolean stays TRUE until it is read by the code. Since your terminal is outside the while loop, it will get read once at program start and then never again.
On a sidenote, you should maybe do a few tutorials and look the the examples that ship with LabVIEW.
You are still stuck in text programming mode, using terminals as a poor substitute for variables and read and write to them via value properties. First of all, this is very expensive. Second, you introduce race conditions.
The "experiment scenario" belongs in a shift register (or feedback node), eliminating all the value properties.
Let's have a look at a potential race condition:
In this image, there is no 100% guarantee that (1) gets written before (2), because there is no direct data dependency. In the worsk case, (2) gets written first and you end up with the settings from (1) after the case completes. You can force execution order by wiring the error cluster between the two nodes as shown with the green line. In any case, the two writes occur nearly at the same time, so you should be able to delete the first write, since these values are very short lived and the final value comes from position (2).
Anyway, place the scenario inside a shift register and connect the indicator to it directly.
Always remember that LabVIEW does not necessarily operates left to right. Execution order is determined exclusively by dataflow and if there is no data depdendency between two nodes, they can execute in any order.
Message Edited by altenbach on 06-20-2008 05:21 PM
Message Edited by altenbach on 06-20-2008 05:25 PM
Use a file dialog (from the advanced file functions palette) and define a pattern (e.g. *.txt). Wire the path output from the file dialog to your read function.
RSibagatullin wrote:
I have one more question about my code. Is it possible for me to force the user to load only files with specific extensions? For example the code above allows to load the user any filed like .xls or .txt. But I won't restrict user's choice only to one specific extension. Is it possible to implement? Thanks.
