public void GetElementsByType(ElementTypes elementTypes, out long[] elementTags, out long[] nodeTags, int tag = -1, ulong task = 0, ulong numTasks = 1)
{
IntPtr elementTagsPtr = IntPtr.Zero;
IntPtr nodeTagsPtr = IntPtr.Zero;
ulong elementTags_n = 0;
ulong nodeTags_n = 0;
GMshNativeMethods.gmshModelMeshGetElementsByType((int)elementTypes, ref elementTagsPtr, ref elementTags_n, ref nodeTagsPtr, ref nodeTags_n, tag, task, numTasks, ref ierr);
if (ierr != 0)
{
throw new GMshException(ierr);
}
elementTags = new long[elementTags_n];
nodeTags = new long[nodeTags_n];
if (elementTags_n != 0)
{
Marshal.Copy(elementTagsPtr, elementTags, 0, elementTags_n.Toint());
}
if (nodeTags_n != 0)
{
Marshal.Copy(nodeTagsPtr, nodeTags, 0, nodeTags_n.Toint());
}
elementTagsPtr.GmshFree();
nodeTagsPtr.GmshFree();
}
