Windows Mobile调用拍照时设备假死现象。

悬赏园豆：40 [已关闭问题] 关闭于 2013-11-27 11:11

今天处理一个问题，程序在调用摄像头时有时候会出现屏幕和键盘失效的情况，只有开关能正常工作，我按下开关键后它会重复的调用摄像头这是什么原因？？？

 1             //GlobalCache.Instance.myWin32.DeHook();// 取消钩子
 2             //try
 3             //{
 4             //    CameraCaptureDialog cameraCapture = new CameraCaptureDialog();
 5             //    cameraCapture.Owner = this;
 6 
 7             //    // Specify the options as user specified.
 8             //    {
 9             //        cameraCapture.InitialDirectory = @"\My Documents";
10             //    }
11 
12             //    cameraCapture.DefaultFileName = null;
13             //    cameraCapture.Title = "YIDA_";
14 
15             //    int videoTimeLimit = 60;
16             //    cameraCapture.VideoTimeLimit = new TimeSpan(0, 0, videoTimeLimit);
17 
18             //    cameraCapture.Mode = CameraCaptureMode.Still;
19 
20             //    // Specify still quality
21             //    cameraCapture.StillQuality = CameraCaptureStillQuality.High;
22 
23             //    cameraCapture.VideoTypes = CameraCaptureVideoTypes.Standard;
24 
25             //    object cameraEnabled = Microsoft.WindowsMobile.Status.SystemState.GetValue(Microsoft.WindowsMobile.Status.SystemProperty.CameraEnabled);
26             //    if (null != cameraEnabled && 0 == (int)cameraEnabled)
27             //    {
28             //        MessageBox.Show("摄像头不可用!", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
29             //        return;
30             //    }
31 
32 
33             //    // Displays the "Camera Capture" dialog box
34             //    if (DialogResult.OK == cameraCapture.ShowDialog())
35             //    {
36             //        string fileName = cameraCapture.FileName;
37 
38             //        // If it is a video we rename the file so that it has the user entered default filename and the correct extension.
39             //        if (cameraCapture.Mode == CameraCaptureMode.Still)
40             //        {
41             //            string filepath;
42             //            filepath = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
43             //            if (filepath != "\\")
44             //            {
45             //                filepath += "\\";
46             //            }
47             //            filepath += "Photo\\";
48             //            Application.DoEvents();
49             //            if (!Directory.Exists(filepath))
50             //            {
51             //                Application.DoEvents();
52             //                Directory.CreateDirectory(filepath);
53             //            }
54             //            Application.DoEvents();
55 
56             //            string extension = fileName.Substring(fileName.LastIndexOf("."));
57             //            string directory = "";
58             //            //if (fileName.LastIndexOf("\\") != -1)
59             //            //{
60             //            //    directory = fileName.Substring(0, fileName.LastIndexOf("\\") + 1);
61             //            //}
62             //            fileName = filepath + "" + "QS_" + tbydh.Text.Trim() + "" + DateTime.Now.ToString() + "" + extension;
63 
64             //            fileName = fileName.Replace(":", "-");
65             //            // 图片名称
66             //            //string fileName = "ZDCamera.jpg";
67             //            if (System.IO.File.Exists(fileName))
68             //            {
69             //                System.IO.File.Delete(fileName);
70             //            }
71 
72             //            System.IO.File.Move(cameraCapture.FileName, fileName);
73             //            GC.Collect();
74             //        }
75             //        //// The method completed successfully.
76             //        //MessageBox.Show("The picture or video has been successfully captured and saved to:\n\n" + fileName, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Asterisk, MessageBoxDefaultButton.Button1);
77             //    }
78             //}
79             //catch (ArgumentException ex)
80             //{
81             //    // An invalid argument was specified.
82             //    MessageBox.Show(ex.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
83             //}
84             //catch (OutOfMemoryException ex)
85             //{
86             //    // There is not enough memory to save the image or video.
87             //    MessageBox.Show(ex.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Hand, MessageBoxDefaultButton.Button1);
88             //}
89             //catch (InvalidOperationException ex)
90             //{
91             //    // An unknown error occurred.
92             //    MessageBox.Show(ex.Message, this.Text, MessageBoxButtons.OK, MessageBoxIcon.Hand, MessageBoxDefaultButton.Button1);
93             //}
94             //finally
95             //{
96             //    GlobalCache.Instance.myWin32.AddHookList();//添加钩子
97             //}

View Code

        /// <summary>
        /// 取消所有屏蔽的键值
        /// </summary>
        /// <returns></returns>
        public bool DeHook()
        {
            bool retKeyboard = true;
            if (hHook != (IntPtr)0)
            {
                retKeyboard = Win32.UnhookWindowsHookEx(hHook);
                hHook = (IntPtr)0;
                HookHT.Clear();
            }
            return true;
        }


     /// <summary>
        /// 将一个键值添加到钩子列表
        /// </summary>
        /// <param name="nKeyValue"></param>
        public void AddHookKeyValueToList(int nKeyValue)
        {
            if (HookHT == null)
            {
                HookHT = new Hashtable();
            }
            if (!HookHT.ContainsKey(nKeyValue))
            {
                HookHT.Add(nKeyValue, 0);
            }
        }