How to use Dtk_Preview Class

A Dtk_Preview is a Thumbnail image that may exist in a CAD file. You can get a preview for a Dtk_Component and/or Dtk_Node.
Using GetPreview() method of Dtk_Component retrieves the model preview.
Using GetPreview() method of Dtk_Node retrieves the node preview (for example a drawing type node).

Dtk_PreviewPtr TmpPreview = inComponent->GetPreview();
if (TmpPreview.IsNotNULL())
{
    Dtk_Int32 size = TmpPreview->GetStreamSize();
    char *jpgimage = TmpPreview->GetStream();
    Dtk_string Preview_name = "Preview.jpg";
    FILE *jpg = Preview_name.OpenFile("wb");
    if (jpg)
    {
        fwrite(jpgimage,sizeof(char),size,jpg);
        fclose(jpg);
    }
}