Sorry to answer with some questions..
Which version of LV are you using?
Does the file that you attempt to write to, exist? Do you specify a filename in your vi?
Otherwise,(in LV7) you will be prompted for a file. If it does not exist, the subvi will create it. If it exists, it will ask if you want to overwrite it.
Experiment with the "Write Character to File" vi by simply connecting a string to it... and run it.
BTW, your file must be closed when you attempt to write to it, otherwise the error is actually from Windows.
If you want to append to an existing file (add to it without deleting the original contents), then wire a TRUE to "Append to file". Of course, your file path should be filled in with an appropriate path & filename. In t
his case, you will not be prompted for a filename. However, you can experiment without providing (wiring) a path & filename, let LV prompt you.
Try this as a starting point. You should not get an error. If you still do, can you write what the error message is?
-enjoy-
JLV
