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How to read text from a file in Vijeo Designer?

Published date: 16 January 2019

Issue: How to read text from a file in Vijeo Designer?

Product Line: Vijeo Designer

Resolution: In Vijeo Designer, we are able to read text from a file. There is an example provided in the help file of Vijeo Designer. Please see section

Here is an excerpt of the Help File: File Methods

Use the following methods to read from a text file (.txt) line-by-line. The text file's encoding must be Unicode. For information on how to add a text file to your project, see Section 11.7.4, Adding Text Files to the Target.




Opens the text file at run time.


Reads from the text file one line at a time.


Closes the text file.



The following example shows how to open, read, and close a text file at run time.

String s; //Java string variable

int lineNum = 0;"File1"); //File1 is the alias name of the text file


{s= TextFile.readLn(); //returns the first 700 characters in the line

if (s==null) break;

STRING01[lineNum++].write(s); //STRING01 is a Vijeo Designer string array variable




  • Make sure that the string array variable (STRING01, in the above example) has enough elements to handle the number of lines in the text file. Use the NumOfBytes property of the array variable to set the length of the array elements. Note that the maximum number of characters a string variable can hold is 100 (i.e., NumOfBytes=100). If a single line contains the maximum of 700 characters, the last 600 will be truncated. For more information, see Section, Data Details Tab.

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