Web page get serial data

Recently do a B/s project, need to read the value of the electronic scale, has not done before, and no experience, so found on the internet a lot of roughly two kinds of

1. Using ActiveX controls, JS calls MSCOMM32.dll's serial control to control the serial port
2. Control the serial port using the C # language control, and then use Js+ajax to interact with C # to obtain serial port data

For details see Using JS to get serial data http://blog.csdn.net/xuing/article/details/6688306 but the younger brother uses both methods to get the data

The serial port configuration is as follows:

1                  serialport1.portname = "COM1";          Port Name 2             serialport1.baudrate =;            Baud Rate 3             serialport1.parity = Parity.none;       Parity 4             serialport1.stopbits = Stopbits.one;    Efficacy 5             serialport1.databits = 8;               Data bit length per byte

Finally, a different idea: use C # to write an ActiveX control (auspicious teacher reminder) The last embedded Web page reads the data as follows:

2. The first step: Create a new project, such as selecting a class library project under Windows.
4. Add a class to your project: IObjectSafety.cs
6. The IObjectSafety.cs code is as follows:

   Using system;using system.collections.generic;using system.text;using system.runtime.interopservices;namespace myactive{    //guid Unique, immutable, otherwise will not be able to pass the security authentication of IE Browser ActiveX control      [ComImport, Guid (" cb5bdc81-93c1-11cf-8f20-00805f2cd064 ")]    [InterfaceType (Cominterfacetype.interfaceisiunknown)]    public Interface IObjectSafety    {        [preservesig]        void getinterfaccesafyoptions (int riid,out int pdwsupportedoptions,out int pdwenabledoptions);}    }

8. Add a user control MyActiveXControl.cs
9. Modify the MyActiveXControl.cs code to inherit the IObjectSafety and define the appropriate GUID, which is the ActiveX ClassID

   Using System; Using System.Collections.Generic; Using System.ComponentModel; Using System.Drawing; Using System.Data; Using System.Text; Using System.Windows.Forms; Using System.runtime.interopservices;namespace myactivex {     [Guid ("218849af-1b2c-457b-acd5-b42ac8d17eb7"), ComVisible (true)] public     partial class myactivexcontrol:usercontrol,iobjectsafety     {         public Myactivexcontrol ()         {             InitializeComponent ();         }        #region IObjectSafety member for ActiveX control Security Trust public        void getinterfaccesafyoptions (int riid, out int pdwsupportedoptions , out int pdwenabledoptions)         {             pdwsupportedoptions = 1;             Pdwenabledoptions = 2;         }        public void setinterfacesafetyoptions (int riid, int dwoptionssetmask, int dwenabledoptions)         {             throw new NotImplementedException ();         }         #endregion     }}

   Now that the active control is finished, we'll add a text box, button, SerialPort, Timer control to test
   

10. The event code to add the response is as follows

    Using system;using system.collections.generic;using system.componentmodel;using system.drawing;using System.Data; Using system.io.ports;using system.text;using system.threading;using system.windows.forms;using System.runtime.interopservices;using myactive;namespace myactivex{//cannot be changed [Guid (" 218849af-1b2c-457b-acd5-b42ac8d17eb7 "), ComVisible (true)] public partial class Myactivexcontrol:usercontrol, Iobject        Safety {public Myactivexcontrol () {InitializeComponent (); public delegate void Handleinterfaceupdatadelegate (string text);//define a delegate private Hand Leinterfaceupdatadelegate interfaceupdatahandle;//declares that bool Isclose = false;//is closed #region IObjectSafety members are used to ActiveX control Security Trust public void getinterfaccesafyoptions (int riid, out int pdwsupportedoptions, out int pdwenabledoptions            ) {pdwsupportedoptions = 1;        Pdwenabledoptions = 2; } public void SetInterfacesafetyoptions (int riid, int dwoptionssetmask, int dwenabledoptions) {throw new Notimplementedexc        Eption ();            } #endregion private void Button1_Click (object sender, EventArgs e) {try                 {interfaceupdatahandle = new handleinterfaceupdatadelegate (updatetextbox);//instantiation of Delegate Object                serialport1.datareceived + = new Serialdatareceivedeventhandler (serialport1_datareceived);                if (!serialport1.isopen) {serialport1.open (); } button2.                Enabled = true; Button1.            Enabled=false; } catch (Exception ex) {MessageBox.Show (ex.                Message);            Return } timer1.                    Enabled = true; }///<summary>///Control load events///</summary>//<param name= "Sender" ></para m>//&LT;param name= "E" ></param> private void Myactivexcontrol_load (object sender, EventArgs e) {        Setorgcomb ();            }///<summary>//Initialize serial port///</summary> private void Setorgcomb () {          Serialport1.portname = "COM1";            Port name serialport1.baudrate = 1200;       Baud rate serialport1.parity = Parity.none;    Parity checksum serialport1.stopbits = Stopbits.one;               Efficacy serialport1.databits = 8; Data bit length per byte}///<summary>//Update data///</summary>//<param name= "Te XT "></param> private void Updatetextbox (string text) {//richtextbox1.text = text +" \n\            T "+ richtextbox1.text;        richTextBox1.Text = Text; }///<summary>//////</summary>//<param name= "Sender" ></par am>//<paRam Name= "E" ></param> private void Serialport1_datareceived (object sender, Serialdatareceivedeventargs e) {//Gets the number of bytes of data in the receive buffer if (Serialport1.bytestoread > 5) {string str Temp = Serialport1.readexisting ();//reads the serial port double weight = -1;//gets to the weight of the foreach (String str in                    Strtemp.split (' = '))//Get the stable value {double flog = 0; If the data is normal if (double. TryParse (str, out flog) &&str. IndexOf ('. ') >0&&str[str.                    length-1]!= '. ') {//Data conversion serial port gets to the data is flashbacks and therefore reverses char[] Chararray = str.                        ToCharArray ();                        Array.reverse (Chararray); String left = new String (Chararray). Split ('. ')                        [0]; String right = new string (Chararray). Split ('. ')                        [1]; if (right.       length==2) {                     weight = Int. Parse (left) + int.                        Parse (right)/100.0; }}} if (weight>=0) {//In the owning control's underlying window handle                                        , executes the specified delegate with the specified argument list. This. Invoke (Interfaceupdatahandle, weight. ToString ());//Fetch Data Update}}} private void Button2_Click (object sender, EventArgs E) {try {button1.                Enabled = true; Button2.                Enabled = false;                Serialport1.close (); Timer1.                                           Enabled = false; } catch (Exception ex) {MessageBox.Show (ex.            Message);                }} private void Timer1_Tick (object sender, EventArgs e) {if (isclose) {            Return } try {string send = "" + (ChaR) + ' P ';            Send = Serialport1.readexisting (); } catch (Exception ex) {MessageBox.Show (ex.                Message);            button2_click (null, NULL); }        }    }}

    
    

12. Now that the active control reading the serial data is finished, let's create an installation package, create a new Installation project
14. Add the ActiveX DLL:MyActiveX.dll we made earlier in the file system of the installation project
    (Special note: After the file is added, right-click on the file Selection property and set its property register value to: vsdracom)

9. Build the installer, locate the Setup1.msi under Project Myactivex\setup1\debug, and double-click Install it.
Then create a new HTML file (test.html) in this directory to test our Acticex control. The HTML code is as follows:

Open test.html under IE browser and click Start to listen
Web page get serial data