Creating dll in c++ and using labview to call it

Question

Greetings All,
I have created a .dll file in visual C++ 2005 Express... I have attached both the c file and header file I used to create this dll in the .txt files cfile and header file. I have also included the .dll file itself so that you can use the vi. Please let me know if you have problems using it after you have configured the dll to go to the path you store and call the function ReturnMaxVal.  The problem is the max value keeps giving me a rediculous number. I did this with a 1-D array and it was no problem. If anyone can help it would be much appreciated.
Thanks,
Clint
Attachments:
helpPlease!.zip ‏14 KB

Answer 1

OK, here's a one way to do it. This is the C way, using malloc() to reserve memory.
There's propably a more C++ way to do this, using new and delete, but this works,
although I don't guarantee that it doesn't have memory leaks
This will initialize a 2D int array, but you should get the hang of things with this
example.
#include <iostream>
using namespace std;
int **a = NULL;
void f2(int rows, int cols)
    // create array
    a = (int **)malloc(rows * sizeof(int *));
    for(int i = 0 ; i < rows ; i++)
        a[i] = (int *)malloc(cols * sizeof(int));
    // init values
    for(int i = 0 ; i < rows ; i++)
        for(int j = 0 ; j < cols ; j++)
            a[i][j] = i+j;
            cout << a[i][j];
        cout << endl;
int main(void)
    int rows = 0;
    int cols = 0;
    cout << "Enter number of rows: ";
    cin >> rows;
    //cout << endl;
    cout << "Enter number of colums: ";
    cin >> cols;
    //cout << endl;
    f2(rows, cols);
    // free reserved memory   
    for(int i = 0 ; i < rows ; i++)
        free(a[i]);
    free(a);
    a = NULL;
    return 0;
Hopefully this helps. You can try to google for other possibilities, there seems
to be a lot of forum post about this matter.