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Getting Input from a Text File

Summary: You can use a macro to read information from a text file. The steps are easy, and then you can use that information in any way you see fit. (This tip works with Microsoft Excel 97, Excel 2000, Excel 2002, Excel 2003, and Excel 2007.)

True to its BASIC roots, VBA allows you to do file input on sequential files. This means you can open and read a sequential text file, loading the information from the file into string variables. The steps are simple. You only have to open the file, get the input, and then close the file. The following code is a common example of reading from a sequential file:

Dim Raw As String
Dim NumValues As Integer, J As Integer
Dim UserVals() As String

Open "MyFile.Dat" For Input As #1
Line Input #1, Raw
NumValues = Val(Raw)
ReDim UserVals(NumValues)

For J = 1 to NumValues
    Line Input #1, UserVals(J)
Next J
Close #1

In this example you should note that the first line read from the text file (MyFile.Dat) is assumed to contain a value that indicates how many items are to be read in from the file.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2227) applies to Microsoft Excel versions: 97 | 2000 | 2002 | 2003 | 2007

Tame Your Data! ExcelTips: Filters and Filtering provides all the details necessary to let you manage large sets of data with confidence and ease. Its information-packed pages demonstrate how to use the two types of filters provided by Excel: AutoFilters and advanced filters.
 
Check out ExcelTips: Filters and Filtering today!