CLAD CLAD File I/O & Data Management 2 — Questions and Answers
Question 1: Which LabVIEW VI is used to get the size of a file without reading its contents?
- File Size
- Get File Position
- Get File Info (Correct answer)
- File Dialog
Correct answer: Get File Info
Get File Info returns attributes of a file including its size, creation date, and modification date without reading its data.
Question 2: What is the purpose of the 'Format Into File' function in LabVIEW?
- Convert a file to binary
- Write formatted string data to a file using a format string (Correct answer)
- Read formatted data from a file
- Validate file format
Correct answer: Write formatted string data to a file using a format string
Format Into File writes formatted text data to a file using a format string similar to the Format Into String function.
Question 3: Which LabVIEW function allows you to move the current read/write position within an open file?
- Set File Position (Correct answer)
- Move File Pointer
- Seek File
- File Offset
Correct answer: Set File Position
Set File Position moves the read/write marker to a specified byte offset within the open file, enabling random access.
Question 4: What is a TDMS file in LabVIEW?
- A compressed archive of VIs
- A technical data management streaming file format optimized for measurement data (Correct answer)
- A text file with delimited sensor values
- A LabVIEW project file
Correct answer: A technical data management streaming file format optimized for measurement data
TDMS (Technical Data Management Streaming) is NI's binary file format designed for high-speed storage of measurement data with metadata support.
Question 5: In LabVIEW, what does the 'Build Path' function do?
- Creates directories on disk
- Combines a base path and a relative path or file name into a single path (Correct answer)
- Validates that a path exists
- Converts a string to a path
Correct answer: Combines a base path and a relative path or file name into a single path
Build Path concatenates a directory path with a file name or relative path to produce a complete, valid path.
Question 6: Which approach is recommended for reading large files in LabVIEW to avoid excessive memory use?
- Read the entire file into memory at once
- Use Read File in a loop to read chunks of data (Correct answer)
- Convert the file to binary first
- Use a DAQ task instead
Correct answer: Use Read File in a loop to read chunks of data
Reading large files in chunks using a loop prevents loading the entire file into memory simultaneously, reducing memory consumption.
CLAD CLAD File I/O & Data Management 2
Which LabVIEW VI is used to get the size of a file without reading its contents?