C++調用fortran生成的DLL

不能從const char *轉換爲LPCWSTR問題，可使用TEXT函數解決，參考：

https://www.cnblogs.com/dongsheng/p/3586418.html

C++代碼

#include <iostream>
#include <Windows.h>
#include <stdio.h>
#include <float.h>
#include <stdlib.h>
typedef void(*LPFNDLLFUNC1)(char *c, const int len);
typedef int(*LPFNDLLFUNC2)(int input);
typedef float(*LPFNDLLFUNC3)(float input);

// 只要有一個定義成傳址，其它全部參數都得設定成傳址。可能跟DLL機制有關係？ 
typedef float(*LPFNDLLFUNC4)(int* length, float* input);
typedef float(*LPFNDLLFUNC5)(float* input, int* length, float* q);
typedef int(*LPFNDLLFUNC6)(float* input, int* row, int* col);

using namespace std; 

int main(int argc, char** argv) {
	printf("double MAX=%le, MIN=%le\n", DBL_MAX, DBL_MIN);
	printf("float MAX=%le, MIN=%le\n", FLT_MAX, FLT_MIN);
	
	const int lenmax = 30, numstr = 3; // changed char length to 30 to fit in the terminal
	char a[numstr][lenmax];
	string str[numstr];
	str[0] = "moon";
	str[1] = "mercury";
	str[2] = "jupiter";
	for (int k = 0; k < numstr; k++) {
		memset(a[k], ' ', lenmax);  // fill space
		int i = 0;
		for (; i < str[k].length();i++) {
			a[k][i] = str[k][i];
		}
		cout << a[k] << endl;
	}
	
	HINSTANCE hDLL = LoadLibrary(TEXT("fortranDLLExample.dll")); // 使用這種調入DLL的方法，在連接器上不須要特殊處理。 
	if (hDLL == NULL){
		cout << "Failed to load library.\n";
	}else{
		LPFNDLLFUNC1 lpfnDllFunc1;  // Function pointer
		lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL, "func01");
		lpfnDllFunc1(a[0], lenmax);
		
		
		LPFNDLLFUNC2 ABZERO;  // Function pointer
		ABZERO = (LPFNDLLFUNC2)GetProcAddress(hDLL, "ABZERO");
		int a=704; // fortran裏面的類型必定要搞對！！！是interger(type=4)或者默認type，對應cpp裏面的int 
		cout<<"ABZERO(704)=="<<ABZERO(a)<<endl;
		
		
		LPFNDLLFUNC3 ABZERO_FLOAT;  // Function pointer
		ABZERO_FLOAT = (LPFNDLLFUNC3)GetProcAddress(hDLL, "ABZERO_FLOAT");
		float b=500.0;  // fortran裏面的類型必定要搞對！！！是real，對應cpp裏面的float，而不是double 
		cout<<"ABZERO_FLOAT(500.0)=="<<ABZERO_FLOAT(b)<<endl;
		
		
		LPFNDLLFUNC4 sum;  // Function pointer
		sum = (LPFNDLLFUNC4) GetProcAddress(hDLL, "sum");
		float c[]={11.0, 44.55, 66.44, 43.23, 6.32, 88.43};
		int l = sizeof(c) / sizeof(c[0]);
		cout<<"length=="<<l<<"; sum(500.0)=="<<sum(&l, c)<<endl;
		
		
		LPFNDLLFUNC5 sum2;  // Function pointer
		sum2 = (LPFNDLLFUNC5) GetProcAddress(hDLL, "SUMANDTIMES");
		float cc[]={11.0, 44.55, 6.32, 88.43};
		l = sizeof(cc) / sizeof(cc[0]);
		float q1 = 10.2;
		cout<<"length=="<<l<<"; SUMANDTIMES([11.0, 44.55, 6.32, 88.43])=="<<sum2(cc, &l, &q1)<<endl;
		
		
		LPFNDLLFUNC6 array2by2;  // Function pointer
		array2by2 = (LPFNDLLFUNC6) GetProcAddress(hDLL, "array2by2");
		float ccc[]={1.1, 1.2, 1.3, 1.4,
                         2.1, 2.2, 2.3, 2.4,
                         3.1, 3.2, 3.3, 3.4,
                         4.1, 4.2, 4.3, 4.4};
		int row, col;
		row = 4;
		col = 4;
		cout<<"length=="<<l<<"; array2by2([11.0, 44.55, 6.32, 88.43])=="<<array2by2(ccc, &row, &col)<<endl;

	}
	FreeLibrary(hDLL);
	return 0;
}

fortran代碼以下：

!  fortranDLLExample.f90 
!
!  FUNCTIONS/SUBROUTINES exported from fortranDLLExample.dll:
!  fortranDLLExample - subroutine 

FUNCTION ABZERO(P) bind(C,name="ABZERO")
    !DEC$ ATTRIBUTES DLLEXPORT :: ABZERO
    !DEC$ ATTRIBUTES VALUE :: P
    integer, INTENT(IN) :: P   
    integer :: ABZERO
    integer :: result1
    ! Examle calculation
    result1 = P - 273
    print *, "The p==", P, ";"
    print *, "The p-273 [", result1, "]"
    ABZERO = result1
    RETURN 
END FUNCTION

FUNCTION ABZERO_FLOAT(P) bind(C,name="ABZERO_FLOAT")
    !DEC$ ATTRIBUTES DLLEXPORT :: ABZERO_FLOAT
    !DEC$ ATTRIBUTES VALUE :: P
    real, INTENT(IN) :: P   
    real :: ABZERO_FLOAT
    real :: result1
    ! Examle calculation
    result1 = P - 273.15
    print *, "The p==", P, ";"
    print *, "The p-273 [", result1, "]"
    ABZERO_FLOAT = P - 273.15
    RETURN 
END FUNCTION

FUNCTION sum(length1, P) bind(C,name="sum")
    !DEC$ ATTRIBUTES DLLEXPORT :: sum
    implicit none
    integer::length1
    real, dimension(*):: P
    real :: sum
    integer::i
    
    print *, "The length1==", length1, ";"
    sum =0.0
    do i = 1,length1 ! sum the array elements
        sum = sum + p(i)
        PRINT *,p(i)
    end do
    RETURN 
END FUNCTION

subroutine func01( a ) bind(C,name="func01")
    !DEC$ ATTRIBUTES DLLEXPORT :: func01
    implicit none
    character(len=1), dimension(90) , intent(in) :: a
    character(len=30), dimension(3) :: b
    integer*4 :: count,i,j

    count=1
    do j=1,3
        b(J)=''
        do I=1,30
            b(J)=trim(b(J))//a(count)
            count=count+1
        enddo
    enddo

    print *
    print *, "char length = ", len(b(1)), len(b(2)), len(b(3))
    print *, "raw a(1) : [", b(1), "]"
    print *, "raw a(2) : [", b(2), "]"
    print *, "raw a(3) : [", b(3), "]"
    print *, "trim     : [", trim(b(1)), "] [", trim(b(2)), "]  [", trim(b(3)), "]"
end

FUNCTION SUMANDTIMES(P, length1, Q) bind(C,name="SUMANDTIMES")
    !DEC$ ATTRIBUTES DLLEXPORT :: SUMANDTIMES
    implicit none
    integer::length1
    real, dimension(*):: P
    real :: SUMANDTIMES, Q
    integer::i
    
    print *, "The length1==", length1, ";"
    SUMANDTIMES =0.0
    do i = 1,length1 ! sum the array elements
        SUMANDTIMES = SUMANDTIMES + p(i) * Q
        PRINT *,p(i)
    end do
    RETURN 
END FUNCTION

FUNCTION array2by2(P, row, col) bind(C,name="array2by2")
    !DEC$ ATTRIBUTES DLLEXPORT :: array2by2
    USE ISO_C_BINDING
    implicit none
    integer::row, col, i, j, array2by2
    !real,DIMENSION(row*col)::
    real P(*)
    real PP(row, col)
    print *, "---->row-----", row
    print *, "---->col-----", col
    do i=1,row
        do j=1,col
            PP(i,j) = P((i-1)*row+j)
            P((i-1)*row+j) = PP(i,j) * 100
            print *, PP(i,j), i, j, (i-1)*row+j
        end do
        print *, "----row-----", i
    end do
    array2by2 = 0
    RETURN 
END FUNCTION