# :DISK:FILE:EXISts?

:DISK File Transfer Commands

- :DISK:FILE:ASCii:READ?
- :DISK:FILE:EXISts?
- :DISK:FILE:READ?
- :DISK:FILE:SIZE?
- :DISK:FILE:TIMestamp?
- :DISK:FILE:WRITe?

## Query Syntax

    :DISK:FILE:EXISts? "filename"

## Description

Use this query to test if a file exists. Returns 1 if the file exists and 0 if the file does not exist. To return the size of a file in bytes, use the `:DISK:FILE:SIZE?` query. To return a time stamp for the file, use the `:DISK:FILE:TIMestamp?` query.

SCPI commands that perform general file I/O operations are limited to Standard Infiniium File Types and Standard Infiniium Folders.

## Example

This Python script (with PyVISA) tests if a specific screen image file exists and returns its size in bytes.

    """
    Checks if file exists and returns its size in bytes.
    """
    import pyvisa  # PyVISA package

    rm = pyvisa.ResourceManager('C:\\WINDOWS\\system32\\visa64.dll')
    Infiniium = rm.open_resource("TCPIP0::localhost::hislip0,4880::INSTR")

    #Set Timeout - 10 seconds
    Infiniium.timeout =  10000
    Infiniium.read_termination = '\n'

    filePath = '"C:\\Users\\user-name\\Documents\\Keysight\\Infiniium\\Screen Images\\DUT_1.png"'
    if Infiniium.query(f':DISK:FILE:EXISts? {filePath}') == '1':
        print('File exists!')
        size = Infiniium.query(f':DISK:FILE:SIZE? {filePath}')
        print(f'File is {size} bytes')
    else:
        print('File not found.')
    Infiniium.write(':SYSTem:GTLocal')
    Infiniium.close()