In this article, I will briefly describe the functionalities of the QRCode library.

Background

QRCode library is a .NET component that can be used to encode and decode QRCode. QRCode is a 2 dimensional bar code that originated in Japan. Nowadays, it is widely used in a wide range of industries, e.g. for vehicle parts tracking and inventory management.

QR stands for "Quick Response". It was created by the Japanese corporation Denso-Wave in 1994 and is aimed at decoding contents at high speed. Nowadays, QR Code is used in mobile phones to ease data entry.

QRCode can also be printed on a business card or shown on any display, which can then be captured by the mobile phone provided the mobile phone has the software to read QRCode.

QRCode library provides functions to:

1. Encode content into a QR Code image which can be saved in JPEG, GIF, PNG, or Bitmap formats
2. Decode a QR Code image

Using the Code

The library can be used in any .NET 2.0 Windows Application, ASP.NET Web application or Windows Mobile device application.

Some sample screenshots are displayed below:

 Collapse

  QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            String encoding = cboEncoding.Text ;
            if (encoding == "Byte") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            } else if (encoding == "AlphaNumeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;            
            } else if (encoding == "Numeric") {
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;            
            }
            try {
                int scale = Convert.ToInt16(txtSize.Text);
                qrCodeEncoder.QRCodeScale = scale;
            } catch (Exception ex) {
                MessageBox.Show("Invalid size!");
                return;
            }
            try {
                int version = Convert.ToInt16(cboVersion.Text) ;
                qrCodeEncoder.QRCodeVersion = version;
            } catch (Exception ex) {
                MessageBox.Show("Invalid version !");
            }

            string errorCorrect = cboCorrectionLevel.Text;
            if (errorCorrect == "L")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
            else if (errorCorrect == "M")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            else if (errorCorrect == "Q")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
            else if (errorCorrect == "H")
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;

            Image image;
            String data = txtEncodeData.Text;
            image = qrCodeEncoder.Encode(data);                      
            picEncode.Image = image;

History

• 20^th September, 2007: Initial post

========================================

The incoming call window name is "Phone - Incoming", not "Phone-Incoming". You miss two blank space.

So change your code to below:

hndl = FindWindow("Dialog", "Phone - Incoming");

如何使用C#在Windows Mobile上编写“今日”屏幕插件（Today plug-in）；

Peter Nowaks 的博客文章creating Managed Services in Windows Mobile by using .NET Compact Framework. 他为此编写了一套类库,你可以在 CodePlex上找到。

Christopher Fairbairn 为第二个问题编写了 “今日”屏幕类库，为各位托管代码的开发者提供了便利 

相关链接
Peter Nowaks on Creating Managed Services in Windows Mobile
Christopher Fairbairn on Creating Managed Today Screen Item

(本文英文原文见：http://blogs.msdn.com/anthonywong/archive/2006/03/13/550686.aspx)

以下托管类是对Connection Manager API的封装

    public class GPRSConnection

    {

        const int S_OK = 0;

        const uint CONNMGR_PARAM_GUIDDESTNET = 0x1;

        const uint CONNMGR_FLAG_PROXY_HTTP = 0x1;

        const uint CONNMGR_PRIORITY_USERINTERACTIVE = 0x08000;

        const uint INFINITE = 0xffffffff;

        const uint CONNMGR_STATUS_CONNECTED = 0x10;

        static Hashtable ht = new Hashtable();



        static GPRSConnection()

        {

            ManualResetEvent mre = new ManualResetEvent(false);

            mre.Handle = ConnMgrApiReadyEvent();

            mre.WaitOne();

            CloseHandle(mre.Handle);

        }



        ~GPRSConnection()

        {

            ReleaseAll();

        }



        public static bool Setup(Uri url)

        {

            return Setup(url.ToString());

        }



        public static bool Setup(string urlStr)

        {

            ConnectionInfo ci = new ConnectionInfo();

            IntPtr phConnection = IntPtr.Zero;

            uint status = 0;



            if (ht[urlStr] != null)

                return true;



            if (ConnMgrMapURL(urlStr, ref ci.guidDestNet, IntPtr.Zero) != S_OK)

                return false;

            

            ci.cbSize = (uint) Marshal.SizeOf(ci);

            ci.dwParams = CONNMGR_PARAM_GUIDDESTNET;

            ci.dwFlags = CONNMGR_FLAG_PROXY_HTTP;

            ci.dwPriority = CONNMGR_PRIORITY_USERINTERACTIVE;

            ci.bExclusive = 0;

            ci.bDisabled = 0;

            ci.hWnd = IntPtr.Zero;

            ci.uMsg = 0;

            ci.lParam = 0;



            if (ConnMgrEstablishConnectionSync(ref ci, ref phConnection, INFINITE, ref status) != S_OK &&

                status != CONNMGR_STATUS_CONNECTED)

                return false;



            ht[urlStr] = phConnection;

            return true;

        }



        public static bool Release(Uri url)

        {

            return Release(url.ToString());

        }



        public static bool Release(string urlStr)

        {

            return Release(urlStr, true);

        }



        private static bool Release(string urlStr, bool removeNode)

        {

            bool res = true;

            IntPtr ph = IntPtr.Zero;

            if (ht[urlStr] == null)

                return true;

            ph = (IntPtr)ht[urlStr];

            if (ConnMgrReleaseConnection(ph, 1) != S_OK)

                res = false;

            CloseHandle(ph);

            if (removeNode)

                ht.Remove(urlStr);

            return res;

        }



        public static void ReleaseAll()

        {

           foreach(DictionaryEntry de in ht)

           {

               Release((string)de.Key, false);

           }

           ht.Clear();

        }



        [StructLayout(LayoutKind.Sequential)]

        public struct ConnectionInfo

        {

            public uint cbSize;

            public uint dwParams;

            public uint dwFlags;

            public uint dwPriority;

            public int bExclusive;

            public int bDisabled;

            public Guid guidDestNet;

            public IntPtr hWnd;

            public uint uMsg;

            public uint lParam;

            public uint ulMaxCost;

            public uint ulMinRcvBw;

            public uint ulMaxConnLatency;

        }



        [DllImport("cellcore.dll")]

        private static extern int ConnMgrMapURL(string pwszURL, ref Guid pguid, IntPtr pdwIndex);



        [DllImport("cellcore.dll")]

        private static extern int ConnMgrEstablishConnectionSync(ref ConnectionInfo ci, ref IntPtr phConnection, uint dwTimeout, ref uint pdwStatus);



        [DllImport("cellcore.dll")]

        private static extern IntPtr ConnMgrApiReadyEvent();



        [DllImport("cellcore.dll")]

        private static extern int ConnMgrReleaseConnection(IntPtr hConnection, int bCache);



        [DllImport("coredll.dll")]

        private static extern int CloseHandle(IntPtr hObject);

    }

使用GPRSConnection class的时候, 先调用Setup方法创建连接，见以下代码：

        public void DoTcpConnection()
        {
            string url = "www.msn.com";
            bool res = GPRSConnection.Setup("http://" + url + "/");
            if (res)
            {
                TcpClient tc = new TcpClient(url, 80);
                NetworkStream ns = tc.GetStream();
                byte[] buf = new byte[100];
                ns.Write(buf, 0, 100);
                tc.Client.Shutdown(SocketShutdown.Both);
                ns.Close();
                tc.Close();
                MessageBox.Show("Wrote 100 bytes");
            }
            else
            {
                MessageBox.Show("Connection establishment failed");
            }
        }