C# 在PC上的通过蓝牙(bluetooth)发送数据到手机

概述

在PC端用.NET开发一个蓝牙下载的程序。实现在PC上查找周围的蓝牙设备（主要是手机），并将PC上的文件通过蓝牙传输到手机上。目前我采用的是OpenNETCF.Net.Bluetooth，能够正常发现周围的蓝牙设备，手机也能够正常进行蓝牙连接并接收文件。

代码实现

1、查找周围蓝牙设备

BluetoothClient bc = new BluetoothClient();
        BluetoothDeviceInfo[] bdi;
        bdi = bc.DiscoverDevices(10);//查找周围最多10个蓝牙设备
        if (bdi.Length == 0)
        {
            this.ShowErrMsg("请确认您的蓝牙已开启！");
            return;
        }

2、打开数据流

 #region OBEXOpenStream
    public bool OBEXOpenStream(string BTMAC)
    {

        // serial port UUID
        Guid spguid = OpenNETCF.Net.Bluetooth.BluetoothService.ObexObjectPush;
        OpenNETCF.Net.BluetoothAddress btaddress = OpenNETCF.Net.BluetoothAddress.Parse(BTMAC);
        client = new OpenNETCF.Net.Sockets.BluetoothClient();

        // define endpoint
        OpenNETCF.Net.BluetoothEndPoint endpoint = new OpenNETCF.Net.BluetoothEndPoint(btaddress, spguid);

        try
        {
            //open socket
            client.Connect(endpoint);
        }
        catch
        {
            //unable to connect (server not listening on spguid)
            return false;
        }

        //connect socket
        stream = client.GetStream();
        return true;
    }
    #endregion

3、配对连接

 private bool OBEXConnect()
    {
        //send client request
        byte[] ConnectPacket = new byte[7];

        ConnectPacket[0] = 0x80;      // Connect
        ConnectPacket[1] = 0x00;      // Packetlength Hi Byte
        ConnectPacket[2] = 0x07;      // Packetlength Lo Byte
        ConnectPacket[3] = 0x10;      // Obex v1
        ConnectPacket[4] = 0x00;      // no flags
        ConnectPacket[5] = 0x20;      // 8k max packet size Hi Byte
        ConnectPacket[6] = 0x00;      // 8k max packet size Lo Byte

        stream.Write(ConnectPacket, 0, ConnectPacket.Length);

        //listen for server response
        byte[] ReceiveBufferA = new byte[3];
        stream.Read(ReceiveBufferA, 0, 3);

        if (ReceiveBufferA[0] == 160) // 0xa0
        {

            //success, decode rest of packet
            int plength = (0xff * ReceiveBufferA[1]) + ReceiveBufferA[2]; //length of packet is...

            //listen for rest of packet
            byte[] ReceiveBufferB = new byte[plength - 3];
            stream.Read(ReceiveBufferB, 0, plength - 3);

            int obver = ReceiveBufferB[0]; //server obex version (16 = v1.0)
            int cflags = ReceiveBufferB[1]; //connect flags
            int maxpack = (0xff * ReceiveBufferB[2]) + ReceiveBufferB[3]; //max packet size

            return true;
        }
        else
        {
            return false;
        }
    }

4、发送文本内容

  //send client request, start put
                        string tName = "BRT优惠卷.txt";
                        string tType = "";
                        string tFileContent = "优惠卷内容:" + this.txtContent.Text.Trim();

                        int result = OBEXRequest("PUT", tName, tType, tFileContent);
                        if (result == 160)
                        {
                            SendSuccess = true;
                        }

完整代码

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Sockets;
using OpenNETCF;
using OpenNETCF.Net;
using OpenNETCF.Net.Bluetooth;
using OpenNETCF.Net.Sockets;

public partial class _Default : System.Web.UI.Page 
{
    //Stream stream;
    NetworkStream stream;
    OpenNETCF.Net.Sockets.BluetoothClient client;
    protected void Page_Load(object sender, EventArgs e)
{

    }

    #region ShowErrMsg
    private void ShowErrMsg(string err)
{
        string str;
        str = "<script language='javascript'>";
        str += " alert('" + err + "')";
        str += "</script>";
        this.RegisterStartupScript("", str);
    }
    #endregion
    protected void btnSend_Click(object sender, EventArgs e)
{
        if (this.txtContent.Text.Trim() == string.Empty)
        {
            this.ShowErrMsg("请输入发送内容！");
            return;
        }
        BluetoothClient bc = new BluetoothClient();
        BluetoothDeviceInfo[] bdi;
        bdi = bc.DiscoverDevices(10);//查找周围最多10个蓝牙设备
        if (bdi.Length == 0)
        {
            this.ShowErrMsg("请确认您的蓝牙已开启！");
            return;
        }
        bool SendSuccess = false;
        try
        {
            foreach (BluetoothDeviceInfo bd in bdi)
            {
                if (OBEXOpenStream(bd.DeviceID.ToString()))
                {

                    if (OBEXConnect())
                    {
                        //send client request, start put
                        string tName = "BRT优惠卷.txt";
                        string tType = "";
                        string tFileContent = "优惠卷内容:" + this.txtContent.Text.Trim();

                        int result = OBEXRequest("PUT", tName, tType, tFileContent);
                        if (result == 160)
                        {
                            SendSuccess = true;
                        }
                    }
                    OBEXCloseStream();
                }
                else
                {
                    this.ShowErrMsg("连接失败！" + bd.DeviceName.ToString());
                }

            }
            if (SendSuccess)
            {
                this.ShowErrMsg("发送成功，谢谢使用！");
            }
        }
        finally
        {
            OBEXCloseStream();
        }
    }


    #region OBEXOpenStream
    public bool OBEXOpenStream(string BTMAC)
{

        // serial port UUID
        Guid spguid = OpenNETCF.Net.Bluetooth.BluetoothService.ObexObjectPush;
        OpenNETCF.Net.BluetoothAddress btaddress = OpenNETCF.Net.BluetoothAddress.Parse(BTMAC);
        client = new OpenNETCF.Net.Sockets.BluetoothClient();

        // define endpoint
        OpenNETCF.Net.BluetoothEndPoint endpoint = new OpenNETCF.Net.BluetoothEndPoint(btaddress, spguid);

        try
        {
            //open socket
            client.Connect(endpoint);
        }
        catch
        {
            //unable to connect (server not listening on spguid)
            return false;
        }

        //connect socket
        stream = client.GetStream();
        return true;
    }
    #endregion

    #region OBEXCloseStream
    private void OBEXCloseStream()
{
        if (stream != null)
        {
            stream.Close();
        }
        if (client != null)
        {
            client.Close();
        }
    }
    #endregion

    #region  OBEXConnect
    private bool OBEXConnect()
{
        //send client request
        byte[] ConnectPacket = new byte[7];

        ConnectPacket[0] = 0x80;      // Connect
        ConnectPacket[1] = 0x00;      // Packetlength Hi Byte
        ConnectPacket[2] = 0x07;      // Packetlength Lo Byte
        ConnectPacket[3] = 0x10;      // Obex v1
        ConnectPacket[4] = 0x00;      // no flags
        ConnectPacket[5] = 0x20;      // 8k max packet size Hi Byte
        ConnectPacket[6] = 0x00;      // 8k max packet size Lo Byte

        stream.Write(ConnectPacket, 0, ConnectPacket.Length);

        //listen for server response
        byte[] ReceiveBufferA = new byte[3];
        stream.Read(ReceiveBufferA, 0, 3);

        if (ReceiveBufferA[0] == 160) // 0xa0
        {

            //success, decode rest of packet
            int plength = (0xff * ReceiveBufferA[1]) + ReceiveBufferA[2]; //length of packet is...

            //listen for rest of packet
            byte[] ReceiveBufferB = new byte[plength - 3];
            stream.Read(ReceiveBufferB, 0, plength - 3);

            int obver = ReceiveBufferB[0]; //server obex version (16 = v1.0)
            int cflags = ReceiveBufferB[1]; //connect flags
            int maxpack = (0xff * ReceiveBufferB[2]) + ReceiveBufferB[3]; //max packet size

            return true;
        }
        else
        {
            return false;
        }
    }
    #endregion

    #region OBEXRequest
    private int OBEXRequest(string tReqType, string tName, string tType, string tFileContent)
{
        //send client request

        int i;
        int offset;
        int packetsize;
        byte reqtype = 0x82;

        int tTypeLen = 0x03;
        int typeheadsize;
        int typesizeHi = 0x00;
        int typesizeLo = 0x03;

        //tName = "contact.vcf";
        //tType = "text/x-vCard";
        //tFileContent = "BEGIN:VCARD
VERSION:2.1
N:;aardvark
FN:aardvark
END:VCARD
";

        if (tReqType == "GET")
        {
            reqtype = 0x83;      // 131 GET-Final
        }

        if (tReqType == "PUT")
        {
            reqtype = 0x82;      // 130 PUT-Final
        }

        packetsize = 3;

        //Name Header
        int tNameLength = tName.Length;
        int nameheadsize = (3 + (tNameLength * 2) + 2);
        int namesizeHi = (nameheadsize & 0xff00) / 0xff;
        int namesizeLo = nameheadsize & 0x00ff;
        packetsize = packetsize + nameheadsize;

        if (tType != "")
        {
            //Type Header
            tTypeLen = tType.Length;
            typeheadsize = 3 + tTypeLen + 1;
            typesizeHi = (typeheadsize & 0xff00) / 0xff;
            typesizeLo = typeheadsize & 0x00ff;
            packetsize = packetsize + typeheadsize;
        }

        //Body
        int fileLen = System.Text.Encoding.Default.GetBytes(tFileContent).Length;//tFileContent.Length;
        int fileheadsize = 3 + fileLen;
        int filesizeHi = (fileheadsize & 0xff00) / 0xff; ;
        int filesizeLo = fileheadsize & 0x00ff; ;

        packetsize = packetsize + fileheadsize;

        int packetsizeHi = (packetsize & 0xff00) / 0xff;
        int packetsizeLo = packetsize & 0x00ff;

        byte[] tSendByte = new byte[packetsize];

        //PUT-final Header
        tSendByte[0] = reqtype;                    // Request type e.g. PUT-final 130
        tSendByte[1] = Convert.ToByte(packetsizeHi);        // Packetlength Hi
        tSendByte[2] = Convert.ToByte(packetsizeLo);        // Packetlength Lo

        offset = 2;

        //Name Header
        tSendByte[offset + 1] = 0x01;                  // HI for Name header    
        tSendByte[offset + 2] = Convert.ToByte(namesizeHi);      // Length of Name header (2 bytes per char)
        tSendByte[offset + 3] = Convert.ToByte(namesizeLo);      // Length of Name header (2 bytes per char)

        // Name+

 in unicode
        byte[] tNameU = System.Text.Encoding.BigEndianUnicode.GetBytes(tName);
        tNameU.CopyTo(tSendByte, offset + 4);

        offset = offset + 3 + (tNameLength * 2);
        tSendByte[offset + 1] = 0x00;                  // null term
        tSendByte[offset + 2] = 0x00;                  // null term

        offset = offset + 2;

        if (tType != "")
        {
            //Type Header
            tSendByte[offset + 1] = 0x42;                  // HI for Type Header 66
            tSendByte[offset + 2] = Convert.ToByte(typesizeHi);      // Length of Type Header
            tSendByte[offset + 3] = Convert.ToByte(typesizeLo);      // Length of Type Header

            for (i = 0; i <= (tTypeLen - 1); i++)
            {
                tSendByte[offset + 4 + i] = Convert.ToByte(Convert.ToChar(tType.Substring(i, 1)));
            }
            tSendByte[offset + 3 + tTypeLen + 1] = 0x00;            // null terminator

            offset = offset + 3 + tTypeLen + 1;
        }

        //Body
        tSendByte[offset + 1] = 0x49;                  //HI End of Body 73
        tSendByte[offset + 2] = Convert.ToByte(filesizeHi);      //
        tSendByte[offset + 3] = Convert.ToByte(filesizeLo);      //1k payload + 3 for HI header

        //for (i = 0; i <= (fileLen - 1); i++)
        //{
        //    tSendByte[offset + 4 + i] = Convert.ToByte(tFileContent.Substring(i, 1));//Convert.ToByte(Convert.ToChar(tFileContent.Substring(i, 1)));
        //}
        byte[] bfile = System.Text.Encoding.Default.GetBytes(tFileContent);
        for (i = 0; i <= bfile.Length - 1; i++)
        {
            tSendByte[offset + 4 + i] = bfile[i];
        }

        //tSendByte[offset+4+fileLen] = 0x00;              // null terminator

        offset = offset + 3 + fileLen;

        stream.Write(tSendByte, 0, tSendByte.Length);

        //listen for server response

        //TODO: can hang here forever waiting response...

        bool x = stream.DataAvailable; // changed bluetoothclient - public NetworkStream GetStream()

        byte[] tArray4 = new byte[3];
        stream.Read(tArray4, 0, 3);

        x = stream.DataAvailable;

        if (tArray4[0] == 160) // 0xa0
        {
            int plength = (tArray4[1] * 256) + tArray4[2] - 3;
            byte[] tArray5 = new byte[plength];
            if (plength > 0)
            {
                stream.Read(tArray5, 0, plength);
                //TODO: data in returned packet to deal with
            }
            return 160;
        }

        if (tArray4[0] == 197) // 0xc5 Method not allowed
        {
            return 197;
        }

        if (tArray4[0] == 192) // 0xc0 Bad Request
        {
            return 192;
        }

        return 0;
    }

    #endregion
}