PSS ID Number: 149746
Article Last Modified on 11/2/1999
The information in this article applies to:
- Microsoft Fortran PowerStation for Windows 95 and Windows NT 4.0
This article was previously published under Q149746
SYMPTOMS
When you use the !MS$ATTRIBUTES DLLEXPORT attribute to export a DLL's subroutine, and call that subroutine from another subroutine within the same DLL it causes the following Access Violation:
RESOLUTION
If you need to call an exported subroutine in a DLL, you should put this code into a non-exported helper subroutine and have the exported subroutine call the non-exported helper subroutine.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.
MORE INFORMATION
Steps to Reproduce Problem
- Build the DLL using the sub.for file listed below. At the MS-DOS command-line prompt, type:
fl32 /LD sub.for
- Build the MAIN program using the main.for file listed below, and link it to the DLL static library file created in Step 1. At the same MS-DOS command-line prompt, type:
fl32 main.for sub.lib
Sample Code to Illustrate Problem
MAIN
! filename: main.for
! Compile options needed: none
program fortapp
interface
subroutine thesub()
!ms$attributes dllimport, stdcall :: thesub
end subroutine
end interface
call thesub()
end program fortapp
DLL
! filename: sub.for
! Compile options needed: /LD
subroutine thesub()
!ms$attributes dllexport, stdcall :: thesub
interface
subroutine othersub()
!ms$attributes dllexport, stdcall :: othersub
end subroutine othersub
end interface
call othersub()
end subroutine
subroutine othersub()
!ms$attributes dllexport, stdcall :: othersub
end subroutine
Additional query words: 4.00
Keywords: kbLangFortran KB149746
Technology: kbAudDeveloper kbFORTRANPower400NT kbFortranSearch kbZNotKeyword8
