Read a Complete Text File in One Pass

Typically, you read and process a text file by using a loop and VB’s Line Input statement:

Do While Not Eof(1)	Line Input #1, myStringVar$	' process the line hereLoop

However, you might want to defer processing or keep a copy of all the lines read for repeat processing or selective editing before writing them out again. You can achieve this quite easily by using VB’ Get# and Split() statements to read the entire file at once and split it into an array containing all the lines. For example, this function returns the complete contents of a file as a string:

Public Function ReadFile(ByVal FileName As String) _	As String	Dim hFile As Long	Dim bBuf() As Byte		hFile = FreeFile	Open FileName For Binary Access Read As #hFile	If LOF(hFile) >hen		ReDim bBuf(1 To LOF(hFile)) As Byte		Get #hFile, , bBuf		Close #hFile		ReadFile = StrConv(bBuf, vbUnicode)	End IfEnd Function

This code snippet drops the contents into an array, using the line break (vbCrLf) as a delimiter:

	Dim sLines() As String	Dim sAll As String	Dim i As Long	' Read the contents of some file	sAll = ReadFile("c:form1.frm")	' Split into individual lines	sLines = Split(sAll, vbCrLf)

You can then process the file as desired; for example, you can search for specific lines:

	For i = LBound(sLines) to UBound(sLines)		If Instr(1, "SomeText", sLines(i), _			vbTextCompare) Then			sLines(i) = "SomeOtherText" 		End If	Next i
Share the Post:
Share on facebook
Share on twitter
Share on linkedin


The Latest

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job