C/C++调用Fortran的DLL的操作过程

!函数功能 两数相加
SUBROUTINE Summator(a,b,c)
      
      REAL a
      REAL b
      REAL c

      c=a+b
  END

!函数功能 两数相加
SUBROUTINE Summator(a,b,c)
      
      REAL a
      REAL b
      REAL c
      c=a+b
  END

  !DEC$ATTRIBUTES DLLEXPORT::SUMMATOR

!MS$IF.NOT.DEFINED(LINKDIRECT)
      !MS$ATTRIBUTES DLLEXPORT::SUMMATOR
      !MS$ENDIF

#include<iostream>
#include <windows.h>
using namespace std;
typedef void(*SUMMATOR)(float a, float b, float *c);

int main(){
    
    //第一步，加载fortran下生成的dll文件
	HINSTANCE hLibrary = LoadLibrary(TEXT("TESTFOR.dll"));
    //判断是否加载成功
	if (hLibrary == NULL) {
		cout << "Cannot open lib" << endl;
		system("pause");
		return -1;
	}

    //第二步，从加载的结果 hLibrary 中查找函数并命名
    SUMMATOR summator = (SUMMATOR)GetProcAddress(hLibrary, "SUMMATOR");
    //判断是否查找到函数
    if (summator == NULL) {
		cout << "Cannot find 'SUMMATOR' function" << endl;
		return -2;
    //第三步，调用
    float a = 1.0;
    float b = 2.0;
	float c = 0.0;
    summator(a,b,&c);   //调用函数
    cout << c << endl;  //输出计算的c
    FreeLibrary(hLibrary);    //释放Library
	system("pause");
	return 0;	
}

 !函数功能 两数相加
      SUBROUTINE Summator(a,b,c)
      !MS$IF.NOT.DEFINED(LINKDIRECT)
      !MS$ATTRIBUTES DLLEXPORT::SUMMATOR
      !MS$ENDIF
          REAL a[VALUE]
          REAL b[VALUE]
          REAL c
          c=a+b
         
      END
      !函数功能 两个数组相加
      SUBROUTINE SummatorArray(array1,array2,array3,n)
      !MS$ATTRIBUTES DLLEXPORT::SUMMATORArray
          INTEGER n[VALUE]
          INTEGER i
          REAL,DIMENSION(n)::array1
          REAL,DIMENSION(n)::array2
          REAL,DIMENSION(n)::array3
           do i=1,n
               array3(i)=array1(i)+array2(i)
           end do

#include<iostream>
#include<windows.h>

using namespace std;
typedef void(*SUMMATOR)(float a, float b, float *c);
typedef void(*SUMMATORARRAY)(float *array1, float *array2, float *array3,int n);
int main() {
	
	//加载dll函数
	HINSTANCE hLibrary = LoadLibrary(TEXT("TESTFOR.dll"));
	if (hLibrary == NULL) {
		cout << "Cannot open dll" << endl;
		system("pause");
		return -1;
	}
	SUMMATOR summator = (SUMMATOR)GetProcAddress(hLibrary, "SUMMATOR");
	if (summator == NULL) {
		cout << "Cannot find 'SUMMATOR' function" << endl;
		return -2;
	float a = 1.0;
	float b = 2.0;
	float c = 0.0;
	summator(a,b,&c);
	cout << c << endl;
	SUMMATORARRAY summatorArray = (SUMMATORARRAY)GetProcAddress(hLibrary, "SUMMATORARRAY");
	if (summatorArray == NULL) {
		cout << "Cannot find 'SUMMATORARRAY' function" << endl;
	int n = 3;
	float *array1 = (float*)calloc(n, sizeof(float));
	float *array2 = (float*)calloc(n, sizeof(float));
	float *array3 = (float*)calloc(n, sizeof(float));
	for (int i = 0; i < n; i++) {
		array1[i] = i;
		array2[i] = i * i;
	summatorArray(array1, array2, array3, n);
		cout << array1[i]<<"+"<<array2[i]<<"="<< array3[i]<<endl;
	FreeLibrary(hLibrary);
	free(array1);
	free(array2);
	free(array3);
	system("pause");
	return 0;
}