Open file check

Hi, I'm using the Open/Create/Replace File.vi. I have it set up so that once the user clicks a button to start logging data, the Open/Create/Replace File.vi is called. Once this is called a window pops up asking the user where to save the file. Is there a way to check whether or not the user pushes the cancel button?
Also, is there a way to check if the file is open? I'm using an event structure, and sometimes I will click on the button to stop recording data, which will trigger the event structure to close the file, but as soon as it's finished closing the file the code will resume where it left off which in some cases it will try to write to the file (which is already closed) and I get an error message.
Thanks!
Sunny

sunny dee wrote:
Hi, I'm using the Open/Create/Replace File.vi. I have it set up so that once the user clicks a button to start logging data, the Open/Create/Replace File.vi is called. Once this is called a window pops up asking the user where to save the file. Is there a way to check whether or not the user pushes the cancel button?
Also, is there a way to check if the file is open? I'm using an event structure, and sometimes I will click on the button to stop recording data, which will trigger the event structure to close the file, but as soon as it's finished closing the file the code will resume where it left off which in some cases it will try to write to the file (which is already closed) and I get an error message.
Thanks!
Sunny
The proper way would be actually to investigate the error cluster. On a user cancel the error status is true and the error code is 43 (user operation canceled). Checking for an invalid path is possible too, but it is not necessarily a fool proof check for all versions and has at least a small theoretical chance of breaking in some future LabVIEW versions.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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