百度人脸识别离线模式的SDK下载及使用(2)

时间：2019-12-27 10:52:08 阅读：333 评论：0 收藏：0 [点我收藏+]

人脸识别初始化　　

安装注册好之后就可以开始使用了。我这里使用的是C/S版的，开发环境为Microsoft .NET Framework 4.5 ，开发工具为vs2015 社区版。

首先，添加dll的引用。

[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
        delegate void FaceCallback ( IntPtr bytes, int size, String res );
        // sdk初始化
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "sdk_init", CharSet = CharSet.Ansi
             , CallingConvention = CallingConvention.Cdecl)]
        private static extern int sdk_init ( bool id_card );
        // 是否授权
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "is_auth", CharSet = CharSet.Ansi
                , CallingConvention = CallingConvention.Cdecl)]
        private static extern bool is_auth ();
        // 获取设备指纹
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "get_device_id", CharSet = CharSet.Ansi
                 , CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr get_device_id ();
        // sdk销毁
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "sdk_destroy", CharSet = CharSet.Ansi
             , CallingConvention = CallingConvention.Cdecl)]
        private static extern void sdk_destroy ();

        //默认电脑自带摄像头，device可能为0，若外接usb摄像头，则device可能为1.
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "usb_track_face_info", CharSet = CharSet.Ansi
        , CallingConvention = CallingConvention.Cdecl)]
        private static extern IntPtr usb_track_face_info ( FaceCallback callback, int dev );

        // 清除跟踪的人脸信息
        [DllImport ("BaiduFaceApi.dll", EntryPoint = "clear_tracked_faces", CharSet = CharSet.Ansi
       , CallingConvention = CallingConvention.Cdecl)]
        private static extern void clear_tracked_faces ();


        // 测试获取设备指纹device_id
        public static void test_get_device_id ()
        {
            IntPtr ptr = get_device_id ();
            string buf = Marshal.PtrToStringAnsi (ptr);
            Console.WriteLine ("device id is:" + buf);
        }

private void FaceScan_Load ( object sender, EventArgs e )
        { 
//设备初始化
            sdk_init (false); 
//是否激活
            bool authed = is_auth (); 
            if (authed)//激活成功
            {
                //获取设备指纹
                test_get_device_id ();
            }
            else
            {

                MessageBox.Show ("该设备未激活");
            } 
            System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false; 
//另起线程扫描人脸
            th = new Thread (test_face_track);
            th.IsBackground = true;
            th.Start ();
        }