"Softimax" <softimax@softimax.it> wrote in message
news:1130290037.672718.91920@f14g2000cwb.googlegroups.com...
> The following code contains a mistake, but I can't find it.
> Polyline works ok and PolyPolyline doesn't draw. Why?
> Thanks!
>
>
> [StructLayout(LayoutKind.Sequential)]
> public struct POINT
> {
> public int x;
> public int y;
> }
>
>
>
> [DllImport("gdi32")] public static extern int PolyPolyline(IntPtr hdc,
> POINT [] lppt, int [] lpdwPolyPoints, int cCount);
> [DllImport("gdi32")] public static extern int Polyline(IntPtr hdc,
> POINT[] lppt, int cCount);
>
>
> IntPtr hDC = g.GetHdc();
> POINT [] Points = new Win32.POINT[3];
> int [] Lenghts = new int[1];
>
> Points[0].x = 0;
> Points[0].y = 0;
> Points[1].x = 100;
> Points[1].y = 30;
> Points[2].x = 100;
> Points[2].y = 100;
> Lenghts[0] = 3;
> PolyPolyline(hDC, Points, Lenghts, 3);
>
> Points[1].x = 40;
> Points[1].y = 90;
> Polyline(hDC, Points, 3);
> g.ReleaseHdc( hDC );
>

> Try this:
>
> PolyPolyline(hDC, Points, Lenghts, 1);
>
> Better still: check the return code for errors
>
> Cheers
> Doug Forster
>

I wrote