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FileSystem.Input Method (Int32, Object)

Reads data from an open sequential file and assigns the data to variables.

Namespace: Microsoft.VisualBasic
Assembly: Microsoft.VisualBasic (in microsoft.visualbasic.dll)

public static void Input (
	int FileNumber,
	ref Object Value
)
public static void Input (
	int FileNumber, 
	/** @ref */ Object Value
)
JScript does not support passing value-type arguments by reference.

Parameters

FileNumber

Required. Any valid file number.

Value

Required. Variable that is assigned the values read from the file—cannot be an array or object variable.

For more detailed information, see the Visual Basic topic Input Function.

The Input function is provided for backward compatibility and may have an impact on performance. For non-legacy applications, the My.Computer.FileSystem object provides better performance. For more information, see File Access with Visual Basic.

Data read with Input is usually written to a file with Write. Use this function only with files opened in Input or Binary mode.

Security noteSecurity Note

When reading from files, do not make decisions about the contents of the file based on the file name extension. For example, a file named Form1.vb may not be a Visual Basic 2005 source file.

When read, standard string or numeric data is assigned to variables without modification. The following table illustrates how other input data is treated.

Data

Value assigned to variable

Delimiting comma or blank line

Empty

#NULL#

DBNull

#TRUE# or #FALSE#

True or False

#yyyy-mm-dd hh:mm:ss#

The date and/or time represented by the expression

#ERROR errornumber#

errornumber (variable is an object tagged as an error)

If you reach the end of the file while you are inputting a data item, the input is terminated and an error occurs.

NoteNote

The Input function is not localized. For example, in the German version, if you input 3,14159, it returns only 3, since the comma is treated as a variable separator rather than a decimal point.

Security noteSecurity Note

Reading from a file with the Input function requires Read access from the FileIOPermissionAccess enumeration. For more information, see FileIOPermissionAccess Enumeration.

This example uses the Input function to read data from a file into two variables. This example assumes that TestFile is a file with a few lines of data written to it using the Write function, each line containing a string in quotations and a number separated by a comma, for example: ("Hello", 234).

FileOpen(1, "TESTFILE", OpenMode.Output)
Write(1, "hello")
Write(1, 14)
FileClose(1)
Dim s As String = "teststring"
Dim i As Integer 
FileOpen(1, "TESTFILE", OpenMode.Input)
Input(1, s)
MsgBox(s)
Input(1, i)
MsgBox(i)
FileClose(1)

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0
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