广播蓝牙服务

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文章信息

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兼容于

平台: S60 3rd Edition, MR

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平台安全性

能力: LocalServices

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文章

关键词: RSdpDatabase

翻译:

翻译自: Advertising Bluetooth services using Symbian C++

由 hoolee

最后由 hamishwillee 在 06 Aug 2012 编辑

• 详细描述

RSdp提供一个到Service Discovery Database的会话session。它可以用来生成到数据库功能的子会话。客户端必须在使

用RSdpDatabase子会话访问数据库时生成并连接到一个会话。

RSdpDatabase是一个SDP的子会话，通过它服务可以记录，它们的属性可以被添加，删除或更新。

下列示例代码展示了如何广播一个客户端蓝牙服务（KBT_serviceID 0x10ff），如何发现特殊服务的范例在这里 Archived:Discovering Bluetooth services using Symbian C++ 可以找到。

监听蓝牙连接可以在这里找到Archived:Establishing a Bluetooth connection using Symbian C++，CMyServiceAdvertiser::StartAdvertiserL(TInt aChannel)中的频道数目参数可以在这里找到。

MMP文件

需要下列能力和链接库

CAPABILITY LocalServices
LIBRARY sdpagent.lib
LIBRARY sdpdatabase.lib

头文件

#include <btsdp.h>
#include <bt_sock.h>
 
// The service id that identifies the service. This id will be 
// used when advertising the service and discovering the service.
#define KBT_serviceID 0x10ff
 
// Service name and description for our service
_LIT(KBTServiceName, "BTpmp");
_LIT(KBTServiceDesc, "BTpmp");
 
// Service discovery protocol session
RSdp iSdp;
 
// Service discovery database (sdp)
RSdpDatabase iSdpDB;
 
// Service record
TSdpServRecordHandle iRecord;
 
// Service record state
TInt iRecordState;

源文件

void CMyServiceAdvertiser::StartAdvertiserL(TInt aChannel)
    {
    // Open sdp session
    User::LeaveIfError(iSdp.Connect());
    // Open sdp database session
    User::LeaveIfError(iSdpDB.Open(iSdp));
 
    // Create a record of the correct service class
    TUUID serviceUUID(KBT_serviceID);
    iSdpDB.CreateServiceRecordL(serviceUUID, iRecord);
 
    // Add a protocol to the record
    CSdpAttrValueDES* protocolDescriptorList = CSdpAttrValueDES::NewDESL(NULL);
    CleanupStack::PushL(protocolDescriptorList);
 
    TBuf8<1> channel;
    channel.Append((TChar)aChannel);
 
    // Create protocol list for our service
    protocolDescriptorList
    ->StartListL()   //  list of protocols required for this method
        ->BuildDESL()
        ->StartListL()
            ->BuildUUIDL(KL2CAP)
        ->EndListL()
 
        ->BuildDESL()
        ->StartListL()
            ->BuildUUIDL(KRFCOMM)
            ->BuildUintL(channel)
        ->EndListL()
    ->EndListL();
 
    // Set protocol list to the record
    iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdProtocolDescriptorList,
        *protocolDescriptorList);
    CleanupStack::PopAndDestroy(protocolDescriptorList);
 
    // Add a name to the record
    iSdpDB.UpdateAttributeL(iRecord,
                                KSdpAttrIdBasePrimaryLanguage +
                                    KSdpAttrIdOffsetServiceName,
                                KBTServiceName);
 
    // Add a description to the record
    iSdpDB.UpdateAttributeL(iRecord,
                                KSdpAttrIdBasePrimaryLanguage +
                                    KSdpAttrIdOffsetServiceDescription,
                                KBTServiceDesc);
 
    // Set service available
    UpdateAvailabilityL(ETrue);
    }

设置广播服务的可用性，service discovery database上的服务记录将依此更新：

void CMyServiceAdvertiser::UpdateAvailabilityL(TBool aAvailable)
    {
    TInt state = aAvailable ? 0xFF : 0x00;
 
    // Set availability
    iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdServiceAvailability, state);
 
    // Mark record changed
    iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdServiceRecordState,
        ++iRecordState);
    }

停止广播服务

void CMyServiceAdvertiser::StopAdvertiserL()
    {
    if ( iRecord!=NULL )
        {
        // Delete record from service discovery database
        iSdpDB.DeleteRecordL(iRecord);
 
        // Close sdp and sdp db sessions
        iSdpDB.Close();
        iSdp.Close();
        iRecord=NULL;
        }
    }