Table Of Contents
Open/Create/Replace File (G Dataflow)
Obtains a reference to a file. You can read from or modify this file using other File and Dialog nodes.
Programming Patterns
prompt
Custom message in the title bar of the file dialog box that appears when you do not wire a value to file path.
file path
Absolute path to the file you want to open.
If you do not wire a value to file path, this node displays a file browser from which you can select a file. If you specify an empty or relative path, this function returns an error.
operation
Action that this node is allowed to perform on the specified file.
| Name | Description |
|---|---|
| open | Opens an existing file. |
| replace | Replaces an existing file by opening the file and setting its end of file to 0. |
| create | Creates a new file. |
| open or create | Opens an existing file or creates a new file if one does not exist. |
| replace or create | Creates a new file or replaces a file if it exists. This node replaces a file by opening the file and setting its end of file to 0. |
| replace or create with confirmation | Creates a new file or replaces a file if it exists and you give permission. This VI replaces a file by opening the file and setting its end of file to 0. |
Default: open
access
Allowable ways to access the returned file.
| Name | Description |
|---|---|
| read/write | Allows you to read or write to the returned file. |
| read-only | Allows you to read from the returned file. |
| write-only | Allows you to write to the returned file. |
Default: read/write
error in
Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.
Default: No error
disable buffering?
refnum out
Reference to the open file.
If the file cannot be opened, the value of this output is Not A Refnum.
cancelled?
A Boolean that specifies whether the user cancelled the file browser or did not select a replacement in an advisory dialog box.
| TRUE | The user cancelled the file browser or did not select a replacement in an advisory dialog box. |
| FALSE | The user specified a path for file path or did not cancel the file browser that appeared. |
error out
Error information. The node produces this output according to standard error behavior.
This node can return the following error codes.
| 7 | You attempted to open or replace a file that cannot be found. |
| 10 | You attempted to create a file that already exists. |
| 43 | You cancelled the dialog box. |
