FIX: Access Violation with Large NAMELIST

WINDOWS    | WINDOWS NT

The information in this article applies to:

• Microsoft FORTRAN PowerStation for MS-DOS, versions 1.0 and 1.0a
• Microsoft FORTRAN PowerStation for Windows NT, version 1.0

SYMPTOMS

An application that uses a large NAMELIST may cause an access violation when attempting to write the NAMELIST. This problem is seen most often with NAMELISTs around 2K in size, but the problem has been known to occur with a NAMELIST as small as 100 bytes.

RESOLUTION

To work around this problem, reduce the size of the NAMELIST. This can be accomplished by either splitting the NAMELIST into multiple smaller NAMELISTs or by grouping variables of similar type together in an array.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in FORTRAN PowerStation 32, version 4.0.

MORE INFORMATION

Sample Code to Demonstrate Problem

C C Compile options needed: none C C This program should cause an access violation

      PROGRAM NAMELISTTest

      CHARACTER*20 TheArray(100)
      INTEGER*4 Index
      NAMELIST /TheNameList/ TheArray

      DO Index = 1,100
          TheArray(Index) = "Testing NAMELIST"
      END DO

      WRITE (*,TheNameList)

      END

REFERENCES

For more information on a related problem, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q65047
   TITLE     : BUG: Errors F1002, F1901, R6000 Using Large Namelists