Microsoft KB Archive/43065

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PRB: Read-only File Fails to Generate F6421 Error PSS ID Number: Q43065 Article last modified on 02-11-1993

4.00 4.01


The information in this article applies to:
- Microsoft FORTRAN for MS-DOS, versions 4.0, 4.01


SYMPTOMS When an application developed in Microsoft FORTRAN attempts to write to a read-only file, the write does not succeed but does not report a run- time error. The compiler is designed to generate the following error message:

  run-time error F6421:
  - file read-only or locked against writing

STATUS Microsoft has confirmed this to be a problem in FORTRAN versions 4.0 and 4.01. This problem was corrected in FORTRAN version 4.1.

More Information:

The following code should generate a “F6421 file read-only or locked against writing” error when the A.B file is read-only.

Sample Code

C Compiler options required: None

 1   RECL = 10)
  WRITE (1, REC = 1) 'TESTING   '

Additional reference words: 4.00 4.01


Copyright Microsoft Corporation 1993.