If you wire a file refnum to the file input, writing begins at the current file position. To append to an existing file, set the file position to the end of the file by using the Set File Position function. The default is to display a file dialog box and prompt you to select a file.
In this tutorial you will learn how to read and write data from and to a text files (with.txt extension) in LabView. At the start you are provided with a simple and explanatory introduction of text files there uses and why do we need to read and write data on them. After that their uses and functionality in LabView is explained with the help of a VI, and an example block diagram in the explanation section. At the end of the tutorial you are provided with an exercise to do it by yourself, and in the next tutorials I will assume that you have done those exercises and I will not explain the concept regarding them.Introduction to text files in labviewA computer file which is structured as a sequence of lines of electronic text is known as a text file also spelled as “textfile”; an old alternative name is “flatfile”. Data can be stored within a computer file with the help of a text file.Easiest format to use and to share data are text files. Writing and reading to a text file can be done by using a computer. Almost every simple text based programs can read and write data to a text file.
Data to be processed in text files in of type string.In LabView, data from your devices can be stored permanently to a text file in simple file I/O function blocks. You can create a text file, open it, write data to a text file, read data from a file and after all this close a text file in LabView, as we will discuss shortly in this tutorial. How to read and write to text files in labviewI will now explain the working of LabView when used with a text file. This will help you understand the main purpose of this tutorial in detail.
Try to do all the exercise in the tutorial on your own to have a better understanding of what I am trying to explain. Create a new blank VI and save it for future use as we have been doing in every tutorial. Writing data to a text file in labview.
From the control palette on the front panel select strings and paths and then select string control and place it on the front panel as shown in the figure below,Figure 1: String control. Extend its size and rename it according to the need as in this case I have named as “Data to be written to text file” and write the string or data inside the string control that you want to be written to you text file.
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March 2023
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