HOW TO: Use the Peek method
Syntax
streamReaderVariableName.Peek
Example
Dim lineOfText As String
Do Until inFile.Peek = -1
lineOfText = inFile.ReadLine
MessageBox.Show(lineOfText)
Loop
reads each line of the file associated with the inFile variable, line by line. Each line (excluding the newline character) is assigned to the lineOfText variable and is then displayed in a messagebox.
Showing posts with label ReadLine. Show all posts
Showing posts with label ReadLine. Show all posts
Wednesday, November 3, 2010
Reading data from a Sequential Access File
HOW TO: Declare a StreamReader Variable
Syntax
{Dim | Private} streamReaderVariableName As IO.StreamReader
Example
Dim inFile As IO.StreamReader
declares a StreamReader variable named inFile.
HOW TO: Create a StreamReader Object
Syntax
IO.File.OpenText(fileName)
Example
inFile = IO.File.OpenText(“report.txt”)
opens the report.txt file for input, creates a StreamReader object and assigns it to the inFile variable.
HOW TO: Read data from a sequential access file
Syntax
streamReaderVariableName.ReadLine
Example
Dim message As String
message = inFile.ReadLine
reads a line of text from the file associated with the inFile variable and assigns the line, excluding the newline character, to the message variable.
Syntax
{Dim | Private} streamReaderVariableName As IO.StreamReader
Example
Dim inFile As IO.StreamReader
declares a StreamReader variable named inFile.
HOW TO: Create a StreamReader Object
Syntax
IO.File.OpenText(fileName)
Example
inFile = IO.File.OpenText(“report.txt”)
opens the report.txt file for input, creates a StreamReader object and assigns it to the inFile variable.
HOW TO: Read data from a sequential access file
Syntax
streamReaderVariableName.ReadLine
Example
Dim message As String
message = inFile.ReadLine
reads a line of text from the file associated with the inFile variable and assigns the line, excluding the newline character, to the message variable.
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