C++实现的binder通讯小程序

最新推荐文章于 2024-08-19 17:10:22 发布

xiaofengcanyue2013

最新推荐文章于 2024-08-19 17:10:22 发布

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分类专栏： framework

本文链接：https://blog.youkuaiyun.com/lushengchu_luis/article/details/9310925

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本文提供了一个简单的C++实现binder通讯的例子，包括binder_test.h、binder_test_client.cpp和binder_test_service.cpp三个文件，用于真机运行。详细介绍了基本架构和代码实现方式。

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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 temporary
LOCAL_C_INCLUDES := binder_test.h

LOCAL_MODULE:= bindertestservice

include $(BUILD_EXECUTABLE)

include $(CLEAR_VARS)

LOCAL_SRC_FILES:= \
	binder_test_client.cpp 

LOCAL_SHARED_LIBRARIES := \
	libutils \
	libbinder

# FIXME The duplicate audioflinger is temporary
LOCAL_C_INCLUDES := binder_test.h

LOCAL_MODULE:= bindertestclient

include $(BUILD_EXECUTABLE)