Return a multidimensional array from pointer function in C++-CLI

Question

I wrote following code to return multidimensional array from pointer function.Input parameter of this function is one dimensional array, output is pointer that point multidimensional array.

double  **function( array< double>^ data,int width,int height ) {
    int i;
    double **R = new double *[height];
    for (i=0;i<=height;i++)
        R[i]=new double [width];

    // ....

    return R;
}

int main( void ) {
    int M=2, N=10, i,j;
    // define multimensional array 2x10

    array< array< double >^ >^ input = gcnew array< array< double >^ >(M);

    for (j=0; j<input->Length; j++) {
        input[j]=gcnew array<double>(N);}
        double **result1 = new double *[N];
        for(i=0; i<=N; i++)
            result1[i]=new double [M];
        double **result2 = new double *[N];
        for(i=0; i<=N; i++)
            result2[i]=new double [M];

        //............

        // send first row array of multidimensional array to function

        result1=function(input[0],M,N);

        // send second row array of multidimensional array to function

        result2=function(input[1],M,N);

        for (i=0;i<=N;i++)
            delete R[k];
        delete R;}*/

    return 0;
 }

I built this program succesfully in Visual Studio 2008.When I debug this code,the program computed result1 pinter variable but during computing result2 in the function here:

R=new double *[height];
for (i=0; i<=height; i++)
    R[i]=new double [width];

Visual Studio give this error:

An unhandled exception of type 'System.Runtime.InteropServices.SEHException' occurred in stdeneme.exe
Additional information: External component has thrown an exception.

Unfortunately I don't know what to do.

AndersK · Accepted Answer · 2009-05-28 14:28:22Z

9

At a glance I see one error

for (i=0;i<=height;i++)
 {
 R[i]=new double [width];
 }

you have allocated R[height] but the loop goes height+1

you should write the loop

for (i=0; i<height; i++)

Another thing I see is that when you want destroy your matrix you write

delete R[k];

but it should be

delete [] R[k];

edited May 28, 2009 at 14:28

answered May 28, 2009 at 14:21

AndersK

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1 Comment

yalcin Over a year ago

Thanks for your help. I corrected <=height problem and did it < height but the Visual Studio is going on give the same error.In fact,Visual C++ can compute result1.Unfortunately it can't do memory allocation for result2 variable.Do you have a comment about this topic?

James Hopkin · Accepted Answer · 2009-05-28 14:16:23Z

3

The <=s are your problem. Valid array indices go from 0 to N-1. Assigning to result1[N] is an access violation - that's the exception it's complaining about.

answered May 28, 2009 at 14:16

James Hopkin

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