EOF

Sets or returns the logical EOF (end-of-file) of the file identified by refnum. pos mode and pos offset specify the new location of the EOF. This function always returns the location of the EOF relative to the beginning of the file.

refnum identifies the file whose EOF you want to set. You cannot set the EOF of a datalog file. If refnum identifies a datalog file, you cannot wire pos mode and pos offset.
pos mode, together with pos offset, specifies where to set the EOF. If the computed location does not exist in the file, for example, pos mod = 0 and pos offset = –10, EOF is not set, and the function returns an error.

If you wire pos offset, pos mode defaults to 0, and the new location of the EOF is relative to the beginning of the file. If you do not wire pos offset, pos mode defaults to 1, and the location of the EOF is left unchanged.

0EOF is set to the beginning of the file plus pos offset.
1EOF is set to the end of the file plus pos offset.
2EOF is set to the current location of the file mark plus pos offset.
pos offset specifies how far from the location specified by pos mode to set the EOF. pos offset is expressed in terms of bytes and the default is 0. Setting the new EOF to an offset smaller than the current logical EOF discards data at the end of the file. Setting the new EOF to an offset larger than the current EOF allocates additional space at the end of the file, although the data in this space is undefined. If pos offset is not wired, the position of the current EOF is returned in offset.
error in describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurs before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
code is the error or warning code. The default is 0. If status is TRUE, code is a non-zero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.
dup refnum is a flow-through parameter with the same value as refnum.
offset indicates the location of the EOF relative to the beginning of the file. offset has units in records for datalog files and bytes for byte stream files.
error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.
status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
code is the error or warning code. If status is TRUE, code is a non-zero error code. If status is FALSE, code is 0 or a warning code.
source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning.