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["sinan mutlu" <>]

Hi,

I am reading vertices from a file and then I try to construct a straight Skeleton using the polygon 
which is constructed by vertices I read from the file. But in the line "ss = ssb.construct_skeleton();" ss becomes "NULL".
I have not understood what is my mistake. 

Can anyone help me for the code below. Why it returns NULL pointer. 
I have attached the example.poly file.

Best Regards,

Sinan Mutlu.


    ifstream readData;
    readData.open("data/example.poly", ios::in);
    readData>>number_of_Poly;
    readData>>vertexCount;
    float x, y;
    for(int i= 0; i<vertexCount;i++)
    {
        readData>>x;
        readData>>y;
        all_pts[i] = Point_2(x,y);
    }
    std::vector<Point_2> star(all_pts,all_pts+(int)vertexCount);
    SsBuilder ssb ;
    // Enter the frame
    ssb.enter_contour
(all_pts,all_pts+(int)vertexCount);
    // Construct the skeleton
    ss = ssb.construct_skeleton();
    if(ss==NULL)
        MessageBox(0, "NULL!!!!", "", 0);

Attachment: example.poly
Description: Binary data