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FreeFile Function

Returns an Integer value representing the next file number available for use by the FileOpen function.

Public Function FreeFile() As Integer

Exception type

Error number




More than 255 files are in use.

See the "Error number" column if you are upgrading Visual Basic 6.0 applications that use unstructured error handling. (You can compare the error number against the Number Property (Err Object).) However, when possible, you should consider replacing such error control with Structured Exception Handling Overview for Visual Basic.

Use FreeFile to supply a file number that is not already in use.

This example uses the FreeFile function to return the next available file number. Five files are opened for output within the loop, and some sample data is written to each.

Dim count As Integer 
Dim fileNumber As Integer 
For count = 1 To 5   
   fileNumber = FreeFile()
   FileOpen(fileNumber, "TEST" & count & ".TXT", OpenMode.Output)
   PrintLine(fileNumber, "This is a sample.")

This function is not supported.

Namespace: Microsoft.VisualBasic

Module: FileSystem

Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)