C# 在PC上的通过蓝牙(bluetooth)发送数据到手机

Posted 2021-04-23 dotNET跨平台

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\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}