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4GuysFromRolla.com : ASP FAQS : FileSystemObject


Question:

How can I read the contents of a file, line-by-line, into an array?


[Print this FAQ]

Answer: Other scripting languages allow for a developer to read the contents of a text file, line-by-line, into an array. Unfortunately, this is not an inherent feature in VBScript or JScript. However, you can easily add such functionality by creating your own function!

4Guys visitor Rafeeq has created such a function and shares it in a User Tip titled: Reading a File into an Array.

(For more information on using the FileSystemObject, see the following FAQ: What is the FileSystemObject? For more information on resizing arrays, be sure to visit the FAQ: How can I dynamically resize an array?)

Another option is to use VBScript's built-in split function. The split function breaks up a delimited string into a one-dimensional array; therefore, if we read the entire contents of a file into a string and then use the split method (using new line characters (vbCrLf) as the delimiters), we can read an entire file's contents into an array, where each element in the array corresponds to a line in the file. (For more information on split, see: Parsing with split and join.)

Essentially, you can use the following code (taking advantage of the textstream's ReadAll method, that reads the entire contents of a file in one go):

Dim objFSO, objTS
Set objFSO = Server.CreateObject("Scripting.FileSystemObject")

Set objTS = objFSO.OpenTextFile(filename)

'Now, read the contents of the file into a string
Dim s
s = objTS.ReadAll

'Now, use split to load the contents of the file into an array
Dim aFile
aFile = split(s, vbCrLf)

Neat, eh?

Happy Programming!


FAQ posted by Scott Mitchell at 10/16/2000 8:36:37 PM to the FileSystemObject category. This FAQ has been viewed 61,441 times.

Do you have a FAQ you'd like to suggest? Suggestions? Comments? If so, send it in! Also, if you'd like to be a FAQ Admin (creating/editing FAQs), let me know! If you are looking for other FAQs, be sure to check out the 4Guys FAQ and Commonly Asked Messageboard Questions!

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Last computed at 9/17/2007 3:22:00 AM


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