Microsoft KB Archive/133104

= FORTRAN PowerStation 32 MIXLANG.TXT =

PSS ID Number: 133104

Article Last Modified on 2/2/2002

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The information in this article applies to:


 * Microsoft Fortran Powerstation 32 for Windows NT 1.0

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This article was previously published under Q133104



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



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:


 * 1) Using the FL32 command on the command line.
 * 2) Compiling within FORTRAN Visual Workbench.
 * 3) 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:


 * 1) 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;....
 * 2) 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.

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 //
 * 1) include 

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 //
 * 1) include 
 * 2) include 
 * 3) 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 //
 * 1) include 
 * 2) include 
 * 3) 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: kbLangC kbLangFortran KB133104

Technology: kbAudDeveloper kbFORTRANPower32100NT kbFortranSearch kbZNotKeyword2

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