FileSystem.Input Method (Int32, Char)


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 char Value


Type: System.Int32

Required. Any valid file number.

Type: System.Char

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

Exception Condition

FileNumber does not exist.


File mode is invalid.

The Input function is provided for backward compatibility and may affect 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 by using Write. Use this function only with files opened in Input or Binary mode.

System_CAPS_security Security 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 that is 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.


Value assigned to variable

Delimiting comma or blank line





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 stopped and an error occurs.


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

System_CAPS_security Security Note

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

This example uses the Input function to read data from a file into two variables. This example assumes that TestFile is a file that has several 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)
Dim s As String = "teststring"
Dim i As Integer
FileOpen(1, "TESTFILE", OpenMode.Input)
Input(1, s)
Input(1, i)

.NET Framework
Available since 1.1
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