FORTRAN PowerStation 32 MIXLANG.TXT
ID: Q133104
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The information in this article applies to:
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Microsoft Fortran Powerstation 32 for Windows NT, version 1.0
SUMMARY
The following information is from the Microsoft FORTRAN PowerStation 32
MIXLANG.TXT file located in the \FPSNT\README directory.
This file has three parts:
Part Contents
---- --------
1 Building C projects
2 Building FORTRAN projects
3 Using DLLs with Mixed Languages
MORE INFORMATION
Part 1: Building C Projects
You can build C projects using FORTRAN code in the C++ Visual
Workbench. Compile your FORTRAN code one of the following ways:
- Using the FL32 command on the command line.
- Compiling within FORTRAN Visual Workbench.
- Using a makefile in C++ Visual Workbench.
Use the FORTRAN compiler option /c to suppress linking.
Include your FORTRAN object (.OBJ) and static library (.LIB) files by
listing them in the Files in Project box on the Project menu.
Run-time libraries must support the FORTRAN code integrated into the
C project. You can access the correct versions through the following
steps:
- From the Options menu, choose Directories. In the Library Files
Path box, insert as the first item the directory path containing
the FORTRAN versions of the C run-time libraries. This assures that
the correct versions of libc.lib, libcmt.lib, and msvcrt.lib will be
loaded by the linker. The typical item list should begin with
c:\fpsnt\lib;... .
- From the Options menu, choose Project. In the new menu, choose
Linker Options. Under Category Setting: Input, in the Object\Library
Modules box, type libf.lib and console.lib.
If you are using the Win32 System Development Kit, make certain that
directory MSTOOLS\BIN from the Win32 SDK does not appear before
MSVCNT\BIN or FPSNT\BIN in the executables directory path; otherwise
LINK32 from SDK will be inappropriately picked up instead of LINK.
Part 2: Building FORTRAN Projects
Passing Strings to C
The following sample code illustrates passing strings from FORTRAN to
C and back using the C convention and using _stdcall. In the first
case, the string is terminated in FORTRAN with the C terminator (\n).
In the second case, a standard FORTRAN string is passed, and the C
program must allow for the hidden length integer at the end of the
string. You can copy this code to the Clipboard and paste it into
your files.
CC FSTR_F.FOR FORTRAN MAIN PROGRAM
CC
INTERFACE TO SUBROUTINE Ucase1 [C,ALIAS:'_Ucase1'] (text)
CHARACTER*(*) text
END
INTERFACE TO SUBROUTINE Ucase2 [ALIAS:'_Ucase2@8'] (text)
CHARACTER*(*) text
END
CHARACTER*40 string1,string2
DATA string1 /'This is a null-terminated string.'C/
DATA string2 /'This is a standard Fortran string.'/
WRITE (*, *) string1
CALL Ucase1 (string1)
WRITE (*, *) string1
WRITE (*, *) string2
CALL Ucase2 (string2)
WRITE (*, *) string2
END
// FSTR_C.C C Subprograms Make strings uppercase
//
#include <ctype.h>
void Ucase1( char *string )
{
char *ptr;
for (ptr = string; *ptr; ptr++)
*ptr = toupper( *ptr );
}
void __stdcall Ucase2( char *string, int length )
{
char *ptr;
for (ptr = string; *ptr; ptr++)
*ptr = toupper( *ptr );
}
Part 3: Using DLLs with Mixed Languages
The following programs are examples of mixed C and FORTRAN programs
using DLLs where the main program is in one language and the DLL is in
the other. The examples communicate data between the main program and
the DLL through a common data structure (a FORTRAN common block and a
C structure).
Redirecting the output of a mixed-language DLL program can produce
unexpected results due to the different I/O buffering performed by the
C and FORTRAN run-time libraries.
These samples can be copied to the Clipboard and pasted into a file to
use as examples and templates for this type of program.
Case 1. A FORTRAN Main Program calls a C DLL
CC FORTRAN MAIN PROGRAM
CC
INTERFACE TO SUBROUTINE csub [C,ALIAS:'_csub']()
END
INTEGER i
REAL x
CHARACTER*4 s
COMMON /BRIDGE[dllimport]/ i, x, s
i = 1
x = 2.5
s = 'fail'
WRITE(*,'(5X,A)') 'before calling dll '
WRITE(*,'(5X,A,I5)') 'i = ', i
WRITE(*,'(5X,A,F4.2)') 'x = ', x
WRITE(*,'(5X,A,A)') 's = ', s
CALL csub()
WRITE(*,'(5X,A)') 'after calling dll '
WRITE(*,'(5X,A,I5)') 'i = ', i
WRITE(*,'(5X,A,F4.2)') 'x = ', x
WRITE(*,'(5X,A,A)') 's = ', s
END
// C DLL Subprogram
//
#include <stdio.h>
#include <string.h>
#define DLLexport _declspec(dllexport)
DLLexport void csub();
DLLexport struct {
int i;
float x;
char s[4];
} BRIDGE;
void csub()
{
BRIDGE.i = BRIDGE.i + 1;
BRIDGE.x = BRIDGE.x + 1.5F;
strcpy(BRIDGE.s, "pass");
printf("\n\n%s\n%s%d\n%s%f\n%s%s\n",
"in the dll",
"i = ", BRIDGE.i,
"x = ", BRIDGE.x,
"s = ", BRIDGE.s);
}
Output redirected to a file:
Before calling dll:
i = 1
x = 2.50
s = fail
After calling dll:
i = 2
x = 4.00
s = pass
Output in the dll:
i = 2
x = 4.000000
s = pass
Case 2. A C Main Program calls a FORTRAN DLL
// C Main Program
//
#include <stdio.h>
#include <string.h>
#define DLLimport _declspec(dllimport)
extern void _stdcall FSUB ();
extern DLLimport struct {
int i;
float x;
char s[4];
} BRIDGE;
void main(){
BRIDGE.i = 1;
BRIDGE.x = 2.5F;
strcpy(BRIDGE.s, "fail");
printf("\n\n%s\n%s%d\n%s%f\n%s%s\n",
"before calling dll", "i = ", BRIDGE.i,
"x = ", BRIDGE.x,
"s = ", BRIDGE.s);
FSUB();
printf("\n\n%s\n%s%d\n%s%f\n%s%s\n",
"before calling dll", "i = ", BRIDGE.i,
"x = ", BRIDGE.x,
"s = ", BRIDGE.s);
}
CC FORTRAN DLL SUBROUTINE
CC
SUBROUTINE FSUB[dllexport]()
COMMON /BRIDGE[dllexport]/ i, x, s
INTEGER i
REAL x
CHARACTER*4 s
i = i + 1
x = x + 1.5
s = 'pass'
WRITE(*,*)
WRITE(*,'(5X,A)') 'in the dll '
WRITE(*,'(5X,A,I5)') 'i = ', i
WRITE(*,'(5X,A,F4.2)') 'x = ', x
WRITE(*,'(5X,A,A)') 's = ', s
END
Output redirected to a file:
In the dll:
i = 2
x = 4.00
s = pass
Before calling dll:
i = 1
x = 2.500000
s = fail
After calling dll:
i = 2
x = 4.000000
s = pass
Additional query words:
1.00
Keywords : kbFortranPS kbLangC kbLangFortran kbVC
Version : :1.0
Platform : NT WINDOWS
Issue type :