public static int fnFGA_img_get_root_params(
	FHANDLE himg,
	ref FHANDLE hroot,
	ref int channel,
	ref int offset_x,
	ref int offset_y
)

Public Shared Function fnFGA_img_get_root_params ( 
	himg As FHANDLE,
	ByRef hroot As FHANDLE,
	ByRef channel As Integer,
	ByRef offset_x As Integer,
	ByRef offset_y As Integer
) As Integer

//    $Revision: 1.2 $

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using fvalgcli;

namespace TC
{
    public partial class FIE
    {
        /// <summary>
        /// 画像のルート情報取得.
        /// </summary>
        [FvPluginExecute]
        public void fnFGA_img_get_root_params()
        {
            int status = (int)f_err.F_ERR_NONE;

            FHANDLE hroot = FHANDLE.Zero;
            FHANDLE hchild = FHANDLE.Zero;
            FHANDLE _hroot = FHANDLE.Zero;

            int type = (int)f_imgtype.F_IMG_UC8;
            int channels = 3;
            int width = 640;
            int height = 480;
            int offset_x = 10;
            int offset_y = 20;
            int child_width = 128;
            int child_height = 64;

            try
            {
                // root 画像生成.
                hroot = fga.fnFGA_img_root_alloc(type, channels, width, height);
                if (hroot == IntPtr.Zero)
                    throw new FvException(f_err.F_ERR_NOMEMORY, "fnFGA_img_root_alloc: エラーが発生しました。");

                // child 画像生成.
                hchild = fga.fnFGA_img_child_alloc(hroot, offset_x, offset_y, child_width, child_height);
                if (hroot == IntPtr.Zero)
                    throw new FvException(f_err.F_ERR_NOMEMORY, "fnFGA_img_child_alloc: エラーが発生しました。");

                // 画像情報取得.            
                int _channel = 0;
                int _offset_x = 0;
                int _offset_y = 0;
                status = fga.fnFGA_img_get_root_params(hchild, ref _hroot, ref _channel, ref _offset_x, ref _offset_y);
                if (status != (int)f_err.F_ERR_NONE)
                    throw new FvException(status, "エラーが発生しました。");

                if (_hroot != hroot)
                    throw new FvException(f_err.F_ERR_INVALID_IMAGE, "ルート画像:一致しません。");
                if (_offset_x != offset_x)
                    throw new FvException(f_err.F_ERR_INVALID_IMAGE, "オフセット(x):一致しません.");
                if (_offset_y != offset_y)
                    throw new FvException(f_err.F_ERR_INVALID_IMAGE, "オフセット(y):一致しません.");
            }
            finally
            {
                hroot.Dispose();　// _hroot は hroot を開放すれば、開放されます.
                hchild.Dispose();
            }
        }
    }
}