C# 在PC上的通過藍牙(Bluetooth)發送數據到手機，你會嗎？
作者：conan
在PC端用.NET開發一個藍牙下載的程序。實現在PC上查找周圍的藍牙設備(主要是手機)，并將PC上的文件通過藍牙傳輸到手機上。
本文轉載自微信公眾號「后端Q」，作者conan。轉載本文請聯系后端Q公眾號。
概述
在PC端用.NET開發一個藍牙下載的程序。實現在PC上查找周圍的藍牙設備(主要是手機)，并將PC上的文件通過藍牙傳輸到手機上。目前我采用的是OpenNETCF.Net.Bluetooth，能夠正常發現周圍的藍牙設備，手機也能夠正常進行藍牙連接并接收文件。
代碼實現
1、查找周圍藍牙設備
- BluetoothClient bc = new BluetoothClient();
- BluetoothDeviceInfo[] bdi;
- bdi = bc.DiscoverDevices(10);//查找周圍最多10個藍牙設備
- if (bdi.Length == 0)
- {
- this.ShowErrMsg("請確認您的藍牙已開啟！");
- return;
- }
2、打開數據流
- #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、配對連接
- 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、發送文本內容
- //send client request, start put
- string tName = "BRT優惠卷.txt";
- string tType = "";
- string tFileContent = "優惠卷內容:" + this.txtContent.Text.Trim();
- int result = OBEXRequest("PUT", tName, tType, tFileContent);
- if (result == 160)
- {
- SendSuccess = true;
- }
完整代碼
- 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("請輸入發送內容！");
- return;
- }
- BluetoothClient bc = new BluetoothClient();
- BluetoothDeviceInfo[] bdi;
- bdi = bc.DiscoverDevices(10);//查找周圍最多10個藍牙設備
- if (bdi.Length == 0)
- {
- this.ShowErrMsg("請確認您的藍牙已開啟！");
- 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優惠卷.txt";
- string tType = "";
- string tFileContent = "優惠卷內容:" + this.txtContent.Text.Trim();
- int result = OBEXRequest("PUT", tName, tType, tFileContent);
- if (result == 160)
- {
- SendSuccess = true;
- }
- }
- OBEXCloseStream();
- }
- else
- {
- this.ShowErrMsg("連接失敗！" + bd.DeviceName.ToString());
- }
- }
- if (SendSuccess)
- {
- this.ShowErrMsg("發送成功，謝謝使用！");
- }
- }
- 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\r\nVERSION:2.1\r\nN:;aardvark\r\nFN:aardvark\r\nEND:VCARD\r\n";
- 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+\n\n 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
- }
責任編輯：武曉燕
來源：
后端Q
