The following conditions may cause an exception:Ī row cannot be parsed using the specified format ( MalformedLineException). TextFieldParser("C:\TestFolder\test.log")Ĭatch ex As This example reads from the file test.log. Dim currentRow As String()Ĭlose the While and Using blocks with End While and End Using. If any lines are corrupted, report an error and continue parsing.
Vb net 2010 read text file line by line code#
The following code defines the columns of text the first is 5 characters wide, the second 10, the third 11, and the fourth is of variable width.
Using Reader As New Microsoft.VisualBasic.įileIO.TextFieldParser("C:\TestFolder\test.log")ĭefine the TextFieldType property as FixedWidth, defining the width and format.
The following code creates the TextFieldParser named Reader and opens the file test.log. To parse a fixed-width text fileĬreate a new TextFieldParser. To specify that the field at the end has a variable width, define it to have a width less than or equal to zero. In a fixed-width text file, the field at the end can have a variable width. The TextFieldType property defines whether the parsed file is a delimited file or one that has fixed-width fields of text. I try my best to help everyone out, but sometimes I don't have time to fit everyone's questions in (there never seem to be quite enough hours in the day!).The TextFieldParser object provides a way to easily and efficiently parse structured text files, such as logs. I can guarantee 9 times out of 10, one of my strategies will get you the answer(s) you are needing faster than it will take me to get back to you with a possible solution. I highly recommend that you check this guide out before asking me or anyone else in the comments section to solve your specific problem. That's why I want to share with you: My Guide to Getting the Solution to your Problems FAST! In this article, I explain the best strategies I have come up with over the years to getting quick answers to complex problems in Excel, PowerPoint, VBA, you name it! We all have different situations and it's impossible to account for every particular need one might have.
How Do I Modify This To Fit My Specific Needs?Ĭhances are this post did not give you the exact answer you were looking for. TempArray = Split(LineArray(x), Delimiter)įor y = LBound(TempArray) To UBound(TempArray) 'PURPOSE: Load an Array variable with data from a delimited text fileįilePath = "C:\Users\chris\Desktop\MyFile.txt"įileContent = Input(LOF(TextFile), TextFile)įor x = LBound(LineArray) To UBound(LineArray) Print - This writes a line of text to the file without quotations Write - This writes a line of text to the file surrounding it with quotations By using FreeFile, the function will automatically return the next available reference number for your text file. This is similar to referencing Workbook(1) vs. You will not be able to modify the text file while opening it with this mode.įor Append - Add new text to the bottom of your text file content.įreeFile - Is used to supply a file number that is not already in use. You will not be able to pull anything from the text file while opening with this mode.įor Input - When you are opening the text file with this command, you are wanting to extract information from the text file. Let's walk through some of the pieces you will see throughout the code in this guide.įor Output - When you are opening the text file with this command, you are wanting to create or modify the text file. When we are working with text files, there will be some terminology that you probably haven't seen or used before when writing VBA code. Below are the main techniques I use to create, modify, extract data, and delete text files. txt files instead of Excel files (especially back in the days with Excel 2003). I like to use them to save settings for my VBA add-ins and I have seen situations where databases have exported large amounts of data into. Text files can be a very fast and simple way to read and store information.