General error handling question

So far, I've been able to intercept errors if I standard VI of wire in order (for example file IO) and handle errors in this way.

Can I really take my code for errors without such wiring?

For example, write on the Board that VI is not a mistake. If I leave the path to the empty file, I get an error, but no way to catch them. If my sub - VI generate errors and error ports, I'm fine. If they are not, I have no means to capture the error. Is this correct?

Is there a way magic of creating a cluster of error with a TRUE value whenever an error anywhere (main or sub - VI), or is it wishful thinking?

Thank you!

If you want the treatment of errors in the file IO, you can make your own using the lower level file tools. They have all the error handling.

You can open the worksheet screws and inspect the code if you wish. Make bring changes, then save them under a new name.

Also do not forget that it is the management of automatic errors (enabled by default), then the screws worksheet will trigger a popup of error (most often unwanted!) if it occurs inside.

Many functions have no errors (for example more basic numeric operations) and a lot of mistakes is not relevant. You should try to catch errors that really matter. Do not forget that the tail all a thread long error will require sequential operations and prevent so potentially the compiler optimization and parallel execution on multicore systems. One of the great powers of LabVIEW is the ease of parallel, simultaneous operation, so do not too throw a lot of sand in the gears.

And, to answer your question, there is no magic way to add function error hydrants that isn't them. You can however wrap them in your own subVIs where you have sanity check on entries and exits, go into/out of the function without error. (for example check because "not a path" out "write on a spreadsheet file", empty array that comes out 'read the worksheet file', and/or place an explicit 'file dialog' in front of them and grab the flag cancelled, etc..)

Tags: NI Software

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