[vtkusers] IntPtr for ActiViz.Net

[mirko heuegger]

Hello!

On Thu, Sep 1, 2011 at 6:35 PM, zlf <jxdw_zlf at yahoo.com.cn> wrote:
> vtkMatrix4x4#MultiplyDoublePoint only accept IntPtr parameter. How to pass
> double[] typed parameter into it?

SampleCode:

//ZOOT is you desired array of whatever (eg: double[] ZOOT = new double[42];)
int s = Marshal.SizeOf(ZOOT[0]) * ZOOT.Length;
System.IntPtr p = Marshal.AllocHGlobal(s);
try
{
    Marshal.Copy(ZOOT, 0, p, ZOOT.Length);     // copy array to
unmanaged memory.
    // do you (pointer) stuff here
    // ....
    Marshal.Copy(p, ZOOT, 0, ZOOT.Length);      // copy results back (if needed)
}
catch (Exception eX)
{
    //handle error here
}
finally
{
    Marshal.FreeHGlobal(p); //free
}

hth

mirko

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