Hello, In response to your question: "How can I creat a new file if it doesn't exist and open the file if it exist?"
Try using the "Open/Create/Replace" VI. This VI can be found on the File I/O palette. Right-click on the "function" input and create a constant. Click on the drop-down arrow for the enum and select "open or create". If you use this function, the VI will open a file if it exists, and create it if it does not. It will not return an error as long as you have the "file path" input wired. Hope this helps! Liz F National Instruments
