Keithley 3700A Series, Справочное руководство

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Series 3700A System Switch/Multimeter Reference Manual Section 11: TSP command reference
3700AS-901-01 Rev. D/June 2018 11-243
fileVar:read()
This function reads data from a file.
Type TSP-Link accessible
Affected by Where saved Default value
Function No
Usage
data1 = fileVar :read()
data1 = fileVar :read( format1 )
data1 , data2 = fileVar :read( format1 , format2 )
data1 , ..., datan = fileVar :read( format1 , ..., formatn )
data1
First data read from the file
data2
Second data read from the file
datan
Last data read from the file
fileVar
The descriptor of the file to be read
format1
A string or number indicating the first type of data to be read
format2
A string or number indicating the second type of data to be read
formatn
A string or number indicating the last type of data to be read
...
One or more entries (or values) separated by commas
Details
The format parameters may be any of the following:
"*n"
: Returns a number.
"*a"
: Returns the whole file, starting at the current position (returns an empty string if the current file
position is at the end of the file).
"*l"
: Returns the next line, skipping the end of line; returns
nil
if the current file position is at the
end of file.
n
: Returns a string with up to n characters; returns an empty string if n is zero; returns
nil
if the
current file position is at the end of file.
If no format parameters are provided, the function will perform as if the function is passed the value
"*l"
.
Any number of format parameters may be passed to this command, each corresponding to a returned
data value.
Also see
File I/O (on page 9-27)
fileVar:write() (on page 11-245)
io.input() (on page 11-254)
io.open() (on page 11-255)