Omron fh-1 series, Руководство пользователя

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Macro Reference
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Vision System FH/FZ5 Series
User’s Manual (Z340)
Isfile
Checks the attribute and the existence of the file.
Format
Isfile(<fileName>)
Parameter
Return value
Returns integer values representing the attribute and the existence of the file.
• 0: There is no file
• 1: File attribute is "file"
• 2: File attribute is "directory"
Description
Checks the attribute and the existence of the file specified in the <fileName> parameter.
In the <fileName> parameter, use an absolute path to specify the file name of the file to be checked.
If the file in the external memory is specified in the <fileName> parameter without the external memory being
inserted to the sensor controller, "0" (There is no file) is returned.
If an incorrect data type is specified for a parameter, a "Type mismatch" error will occur.
Even if a character string longer than 255 characters is specified for a character string parameter, an error will
not occur.
If the format is written incorrectly, such as writing the macro function name incorrectly, omitting a comma, or
omitting a half-width space, a "Syntax error" error will occur.
Usage Cautions
• None.
Example
Checks if the file exists before opening it.
Useable Modules
Unit Calculation Macro / Scene Control Macro / Communication Command Macro / Unit Macro
Supported Versions
Version 3.50 or later
Parameter
name
Data type Description
<fileName>
Character
string type
Absolute path of the file to be checked
Rem Check the file existence
If Isfile("E:\input.dat") <> 1 Then
Print "There is no file"
Endif