Returns an Integer value representing the next file number available for use by the FileOpen function.
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.
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.
Assembly: Visual Basic Runtime Library (in Microsoft.VisualBasic.dll)