C++实现的binder通讯小程序

来源：互联网发布：安装用友数据库不符合编辑：程序博客网时间：2024/05/21 18:35

今日网上看到有人用C++实现了binder通讯的小例子，但是没有给出完整的demo,自己弄了过来整理了一下，可以在真机上运行。基本架构都是一样，代码就不分析了，要分析又得说一遍binder的机制，反正就可以把它当作一个模板来用了，要增加或修改函数，也就是在ITest中增加virtual函数，分别在bp, bn，class Test端实现，并在onTransact中增加case分支即可，够简单吧，代码如下：

binder_test.h：

#ifndef __BINDER_TEST_H#define __BINDER_TEST_H#include <binder/Parcel.h>#include <binder/IPCThreadState.h>#include <binder/ProcessState.h>#include <binder/IServiceManager.h>#include <binder/IBinder.h>#include <binder/IInterface.h>#include <unistd.h>#include <stdio.h>#include <utils/misc.h>#include <utils/Atomic.h>#include <utils/Log.h>namespace android{    class ITest : public IInterface    {        public:            DECLARE_META_INTERFACE(Test);            virtual void getTest() = 0;    };    class BnTest: public BnInterface<ITest>    {        public:            virtual status_t onTransact( uint32_t code,                    const Parcel& data,                    Parcel* reply,                    uint32_t flags = 0);    };    class Test : public BnTest    {        public:            //Test(){ALOGE("got the service");};            //~Test();            virtual void getTest(){ALOGE("got the service");};            void print(){ALOGE("got the service");};    };    enum {        PRINT = IBinder::FIRST_CALL_TRANSACTION,    };    class BpTest : public BpInterface<ITest>    {        public:            BpTest(const sp<IBinder>& impl ):BpInterface<ITest>(impl)        {        }            virtual void getTest()            {                printf("in the get Test\n");                Parcel data, reply;                data.writeInterfaceToken(ITest::getInterfaceDescriptor());                remote()->transact(PRINT, data, &reply);                printf("send Print %d\n",reply.readInt32());            }    };    IMPLEMENT_META_INTERFACE(Test,"android.TestServer.ITest");    status_t BnTest::onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)    {        switch(code)        {            case PRINT:                {                    printf("got the client msg\n");                    CHECK_INTERFACE(ITest, data, reply);                    getTest();                    reply->writeInt32(100);                    return NO_ERROR;                }break;            default:break;        }        return NO_ERROR;    }}// namespace android#endif

binder_test_client.cpp：

#include "binder_test.h"                                                                                                                                       using namespace android;int main(int argc, char *argv[]){    sp<IBinder> binder;    sp<ProcessState> proc(ProcessState::self());    //get service manager    sp<IServiceManager> sm = defaultServiceManager();    do{         binder = sm->getService(String16("service.testmanager"));        if(binder != 0)            break;        sleep(1);    }while(true);    const sp<ITest>& bts = interface_cast<ITest>(binder);    ALOGE("bindertest client is starting.....");     bts->getTest();    return 0;}

binder_test_service.cpp：

#include "binder_test.h"using namespace android;int main(int argc, char *argv[]){    sp<ProcessState> proc(ProcessState::self());    //get service manager    sp<IServiceManager> sm = defaultServiceManager();    sm->addService(String16("service.testmanager"),new Test());ALOGE("bindertest service is starting.....");    ProcessState::self()->startThreadPool();    IPCThreadState::self()->joinThreadPool();    return 0;}

Android.mk：

LOCAL_PATH:= $(call my-dir)include $(CLEAR_VARS)LOCAL_SRC_FILES:= \binder_test_service.cpp LOCAL_SHARED_LIBRARIES := \libutils \libbinder# FIXME The duplicate audioflinger is temporaryLOCAL_C_INCLUDES := binder_test.hLOCAL_MODULE:= bindertestserviceinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_SRC_FILES:= \binder_test_client.cpp LOCAL_SHARED_LIBRARIES := \libutils \libbinder# FIXME The duplicate audioflinger is temporaryLOCAL_C_INCLUDES := binder_test.hLOCAL_MODULE:= bindertestclientinclude $(BUILD_EXECUTABLE)