Q108410: FIX: Entire DLLEXPORTed Arrays Cannot Be Written Implicitly

Article: Q108410
Product(s): Microsoft Fortran Compiler
Version(s): 1.0
Operating System(s): 
Keyword(s): 
Last Modified: 24-MAR-2000

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The information in this article applies to:

- Microsoft Fortran Powerstation 32 for Windows NT, version 1.0 
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SYMPTOMS
========

An attempt to print out an array that is exported from a common block in a
dynamic-link library (DLL) may produce incorrect values when the entire array is
printed at once (by giving only the array name in the I/O statement or by using
an implied do loop).

This problem occurs when writing to all types of files and to the display.

RESOLUTION
==========

Use an implied do loop and add 0 (zero) to the array index, or write the array
elements individually.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft FORTRAN PowerStation
32 for Windows NT, version 1.0. This problem was fixed in FORTRAN PowerStation,
version 4.0.

MORE INFORMATION
================

The following sample code illustrates this problem:

Sample Code #1
--------------

  C Compile options needed: none

  C FORTRAN Main Source:

        interface to subroutine bar[dllimport]()
        end
        common /bridge[dllimport]/ i
        integer*4 i(4)
        i(2) = 2

        write(*,*) 'In Main: i = ', i
        do loop=1,4
          write(*,*) 'In main: i = ', i(loop)
        end do

        write(*,*) 'Calling DLL routine...'
        call bar
  c The commented line below illustrates the suggested workaround:
  c     write(*,*) 'In Main: i = ', (i(loop+0),loop=1,4)
        write(*,*) 'In Main: i = ', (i(loop), loop=1,4)
        do loop=1,4
          write(*,*) 'In main: i = ', i(loop)
        end do
        end

Sample Code #2
--------------

  C FORTRAN DLL Source:

        subroutine bar[dllexport]()
        common /bridge[dllexport]/ i
        integer*4 i(4)
        i(3) = 33
        write(*,*) 'In DLL:  i = ', i
        return
        end

Program Output (corrected for CR/LF anomalies)
----------------------------------------------

  In Main: i =   550774271   637468674      139472 -1869574000
  In main: i =           0
  In main: i =           2
  In main: i =           0
  In main: i =           0
  Calling DLL routine...
  In DLL:  i =           0           2          33           0
  In Main: i =   550774271   637468674      139472 -1869574000
  In main: i =           0
  In main: i =           2
  In main: i =          33
  In main: i =           0

Additional query words: 1.00

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Keywords          :  
Technology        : kbAudDeveloper kbFortranSearch kbZNotKeyword2 kbFORTRANPower32100NT
Version           : :1.0
Issue type        : kbbug
Solution Type     : kbfix

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