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Additional Exercises for Strings and FileI/O

Module by: National Instruments. E-mail the author

Exercise 1

Build a VI that generates a 2D array of 3rows×100columns 3 rows 100 columns of random numbers and writes the data transposed to a spreadsheet file. Add a header to each column. Use the high-level File I/O VIs located on the File I/O palette.

Tip:

Use the Write Characters To File VI to write the header and the Write To Spreadsheet File VI to write the numeric data to the same file.

Save the VI as More Spreadsheets.vi in the C:\Exercises\LabVIEW Basics I directory.

Exercise 2

Build a VI that converts tab-delimited spreadsheet strings to comma-delimited spreadsheet strings, that is, spreadsheet strings with columns separated by commas and rows separated by end of line characters. Display both the tab-delimited and comma-delimited spreadsheet strings on the front panel.

Tip:

Use the Search and Replace String function.

Save the VI as Spreadsheet Converter.vi in the C:\Exercises\LabVIEW Basics I directory.

Exercise 3

Modify the Temperature Logger VI so the VI does not create a new file each time you run the VI. Append the data to the end of the existing temp.dat file that the Temperature Logger VI created. Run the VI several times and use a word processor application to confirm that the VI appended new temperature readings.

Tip:

Delete the Format Into File function and replace it with the Format Into String and Write File functions. Use the pos mode and pos offset parameters of the Write File function to move the current file mark.

Select File>>Save As to save the VI as Temperature Logger 2.vi in the C:\Exercises\LabVIEW Basics I directory.

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