如何用C#在PC上查找连接蓝牙设备并实现数据传输
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
BluetoothClientbc=newBluetoothClient();
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
#regionOBEXOpenStream
publicboolOBEXOpenStream(stringBTMAC)
{
//serialportUUID
Guidspguid=OpenNETCF.Net.Bluetooth.BluetoothService.ObexObjectPush;
OpenNETCF.Net.BluetoothAddressbtaddress=OpenNETCF.Net.BluetoothAddress.Parse(BTMAC);
client=newOpenNETCF.Net.Sockets.BluetoothClient();
//defineendpoint
OpenNETCF.Net.BluetoothEndPointendpoint=newOpenNETCF.Net.BluetoothEndPoint(btaddress,spguid);
try
{
//opensocket
client.Connect(endpoint);
}
catch
{
//unabletoconnect(servernotlisteningonspguid)
returnfalse;
}
//connectsocket
stream=client.GetStream();
returntrue;
}
#endregion
3、配对连接
privateboolOBEXConnect()
{
//sendclientrequest
byte[]ConnectPacket=newbyte[7];
ConnectPacket[0]=0x80;//Connect
ConnectPacket[1]=0x00;//PacketlengthHiByte
ConnectPacket[2]=0x07;//PacketlengthLoByte
ConnectPacket[3]=0x10;//Obexv1
ConnectPacket[4]=0x00;//noflags
ConnectPacket[5]=0x20;//8kmaxpacketsizeHiByte
ConnectPacket[6]=0x00;//8kmaxpacketsizeLoByte
stream.Write(ConnectPacket,0,ConnectPacket.Length);
//listenforserverresponse
byte[]ReceiveBufferA=newbyte[3];
stream.Read(ReceiveBufferA,0,3);
if(ReceiveBufferA[0]==160)//0xa0
{
//success,decoderestofpacket
intplength=(0xff*ReceiveBufferA[1])+ReceiveBufferA[2];//lengthofpacketis...
//listenforrestofpacket
byte[]ReceiveBufferB=newbyte[plength-3];
stream.Read(ReceiveBufferB,0,plength-3);
intobver=ReceiveBufferB[0];//serverobexversion(16=v1.0)
intcflags=ReceiveBufferB[1];//connectflags
intmaxpack=(0xff*ReceiveBufferB[2])+ReceiveBufferB[3];//maxpacketsize
returntrue;
}
else
{
returnfalse;
}
}
4、发送文本内容
//sendclientrequest,startput
stringtName="BRT优惠卷.txt";
stringtType="";
stringtFileContent="优惠卷内容:"+this.txtContent.Text.Trim();
intresult=OBEXRequest("PUT",tName,tType,tFileContent);
if(result==160)
{
SendSuccess=true;
}
完整代码
usingSystem;
usingSystem.Data;
usingSystem.Configuration;
usingSystem.Web;
usingSystem.Web.Security;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Web.UI.WebControls.WebParts;
usingSystem.Web.UI.HtmlControls;
usingSystem.Net.Sockets;
usingOpenNETCF;
usingOpenNETCF.Net;
usingOpenNETCF.Net.Bluetooth;
usingOpenNETCF.Net.Sockets;
publicpartialclass_Default:System.Web.UI.Page
{
//Streamstream;
NetworkStreamstream;
OpenNETCF.Net.Sockets.BluetoothClientclient;
protectedvoidPage_Load(objectsender,EventArgse)
{
}
#regionShowErrMsg
privatevoidShowErrMsg(stringerr)
{
stringstr;
str="";
str+="alert('"+err+"')";
str+="";
this.RegisterStartupScript("",str);
}
#endregion
protectedvoidbtnSend_Click(objectsender,EventArgse)
{
if(this.txtContent.Text.Trim()==string.Empty)
{
this.ShowErrMsg("请输入发送内容！");
return;
}
BluetoothClientbc=newBluetoothClient();
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;
}
boolSendSuccess=false;
try
{
foreach(BluetoothDeviceInfobdinbdi)
{
if(OBEXOpenStream(bd.DeviceID.ToString()))
{
if(OBEXConnect())
{
//sendclientrequest,startput
stringtName="BRT优惠卷.txt";
stringtType="";
stringtFileContent="优惠卷内容:"+this.txtContent.Text.Trim();
intresult=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();
}
}
#regionOBEXOpenStream
publicboolOBEXOpenStream(stringBTMAC)
{
//serialportUUID
Guidspguid=OpenNETCF.Net.Bluetooth.BluetoothService.ObexObjectPush;
OpenNETCF.Net.BluetoothAddressbtaddress=OpenNETCF.Net.BluetoothAddress.Parse(BTMAC);
client=newOpenNETCF.Net.Sockets.BluetoothClient();
//defineendpoint
OpenNETCF.Net.BluetoothEndPointendpoint=newOpenNETCF.Net.BluetoothEndPoint(btaddress,spguid);
try
{
//opensocket
client.Connect(endpoint);
}
catch
{
//unabletoconnect(servernotlisteningonspguid)
returnfalse;
}
//connectsocket
stream=client.GetStream();
returntrue;
}
#endregion
#regionOBEXCloseStream
privatevoidOBEXCloseStream()
{
if(stream!=null)
{
stream.Close();
}
if(client!=null)
{
client.Close();
}
}
#endregion
#regionOBEXConnect
privateboolOBEXConnect()
{
//sendclientrequest
byte[]ConnectPacket=newbyte[7];
ConnectPacket[0]=0x80;//Connect
ConnectPacket[1]=0x00;//PacketlengthHiByte
ConnectPacket[2]=0x07;//PacketlengthLoByte
ConnectPacket[3]=0x10;//Obexv1
ConnectPacket[4]=0x00;//noflags
ConnectPacket[5]=0x20;//8kmaxpacketsizeHiByte
ConnectPacket[6]=0x00;//8kmaxpacketsizeLoByte
stream.Write(ConnectPacket,0,ConnectPacket.Length);
//listenforserverresponse
byte[]ReceiveBufferA=newbyte[3];
stream.Read(ReceiveBufferA,0,3);
if(ReceiveBufferA[0]==160)//0xa0
{
//success,decoderestofpacket
intplength=(0xff*ReceiveBufferA[1])+ReceiveBufferA[2];//lengthofpacketis...
//listenforrestofpacket
byte[]ReceiveBufferB=newbyte[plength-3];
stream.Read(ReceiveBufferB,0,plength-3);
intobver=ReceiveBufferB[0];//serverobexversion(16=v1.0)
intcflags=ReceiveBufferB[1];//connectflags
intmaxpack=(0xff*ReceiveBufferB[2])+ReceiveBufferB[3];//maxpacketsize
returntrue;
}
else
{
returnfalse;
}
}
#endregion
#regionOBEXRequest
privateintOBEXRequest(stringtReqType,stringtName,stringtType,stringtFileContent)
{
//sendclientrequest
inti;
intoffset;
intpacketsize;
bytereqtype=0x82;
inttTypeLen=0x03;
inttypeheadsize;
inttypesizeHi=0x00;
inttypesizeLo=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;//131GET-Final
}
if(tReqType=="PUT")
{
reqtype=0x82;//130PUT-Final
}
packetsize=3;
//NameHeader
inttNameLength=tName.Length;
intnameheadsize=(3+(tNameLength*2)+2);
intnamesizeHi=(nameheadsize&0xff00)/0xff;
intnamesizeLo=nameheadsize&0x00ff;
packetsize=packetsize+nameheadsize;
if(tType!="")
{
//TypeHeader
tTypeLen=tType.Length;
typeheadsize=3+tTypeLen+1;
typesizeHi=(typeheadsize&0xff00)/0xff;
typesizeLo=typeheadsize&0x00ff;
packetsize=packetsize+typeheadsize;
}
//Body
intfileLen=System.Text.Encoding.Default.GetBytes(tFileContent).Length;//tFileContent.Length;
intfileheadsize=3+fileLen;
intfilesizeHi=(fileheadsize&0xff00)/0xff;;
intfilesizeLo=fileheadsize&0x00ff;;
packetsize=packetsize+fileheadsize;
intpacketsizeHi=(packetsize&0xff00)/0xff;
intpacketsizeLo=packetsize&0x00ff;
byte[]tSendByte=newbyte[packetsize];
//PUT-finalHeader
tSendByte[0]=reqtype;//Requesttypee.g.PUT-final130
tSendByte[1]=Convert.ToByte(packetsizeHi);//PacketlengthHi
tSendByte[2]=Convert.ToByte(packetsizeLo);//PacketlengthLo
offset=2;
//NameHeader
tSendByte[offset+1]=0x01;//HIforNameheader
tSendByte[offset+2]=Convert.ToByte(namesizeHi);//LengthofNameheader(2bytesperchar)
tSendByte[offset+3]=Convert.ToByte(namesizeLo);//LengthofNameheader(2bytesperchar)
//Name+\n\ninunicode
byte[]tNameU=System.Text.Encoding.BigEndianUnicode.GetBytes(tName);
tNameU.CopyTo(tSendByte,offset+4);
offset=offset+3+(tNameLength*2);
tSendByte[offset+1]=0x00;//nullterm
tSendByte[offset+2]=0x00;//nullterm
offset=offset+2;
if(tType!="")
{
//TypeHeader
tSendByte[offset+1]=0x42;//HIforTypeHeader66
tSendByte[offset+2]=Convert.ToByte(typesizeHi);//LengthofTypeHeader
tSendByte[offset+3]=Convert.ToByte(typesizeLo);//LengthofTypeHeader
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;//nullterminator
offset=offset+3+tTypeLen+1;
}
//Body
tSendByte[offset+1]=0x49;//HIEndofBody73
tSendByte[offset+2]=Convert.ToByte(filesizeHi);//
tSendByte[offset+3]=Convert.ToByte(filesizeLo);//1kpayload+3forHIheader
//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;//nullterminator
offset=offset+3+fileLen;
stream.Write(tSendByte,0,tSendByte.Length);
//listenforserverresponse
//TODO:canhanghereforeverwaitingresponse...
boolx=stream.DataAvailable;//changedbluetoothclient-publicNetworkStreamGetStream()
byte[]tArray4=newbyte[3];
stream.Read(tArray4,0,3);
x=stream.DataAvailable;
if(tArray4[0]==160)//0xa0
{
intplength=(tArray4[1]*256)+tArray4[2]-3;
byte[]tArray5=newbyte[plength];
if(plength>0)
{
stream.Read(tArray5,0,plength);
//TODO:datainreturnedpackettodealwith
}
return160;
}
if(tArray4[0]==197)//0xc5Methodnotallowed
{
return197;
}
if(tArray4[0]==192)//0xc0BadRequest
{
return192;
}
return0;
}
#endregion
}
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