Android Binder实战开发指南之Native层使用Framework层Binder服务

                    Android Binder实战开发指南之Native层使用Framework层Binder服务

      承接上一篇 Android Binder实战开发指南之创建Framework层Binder系统服务，前面主要介绍了在Java的世界里面怎么通过Binder进行PIC跨进程调用，那么本篇将介绍Native层怎么通过C++使用上一篇文章中实现的Binder服务。

 

实现步骤详解

•    获取远程BinderFunManager服务端代理

//获取系统服务BinderFunManager代理
sp  getBinderFunService()
{
	sp sm = defaultServiceManager();
	return sm->getService(String16("BinderFunManager")); 
}

• 跨进程调用

        static String16 mydescriptor = String16("com.xxx.binderapifun.server.BinderFunManager");
        data.writeInterfaceToken(mydescriptor);
		static String16 str = String16("I am client from Native call");
		
		
		data.writeString16(str);
		binderFun->transact(TRANSAVTION_FUN, data, &reply, 0);
		int result = reply.readInt32();
		LOGE(TAG,"transact result : %d\n", result);
		size_t datasize = reply.dataSize();
        const uint8_t *data = reply.data();

        for (int i = 0;i

这样一次跨进程调用就实现了，是不是很简单。下面看看具体的调用结果

10-22 13:44:01.350 23625 23638 D BinderApiFun: FUN : I am client from Native call
10-22 13:44:01.352 25131 25131 E NativeClient: transact result : 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[0] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[1] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[2] = 0
10-22 13:44:01.352 25131 25131 E NativeClient: Client data[3] = 0

具体实现代码如下

#include 
#include //flock's head
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace android;


#define LOGE(TAG,...) if(1) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__);
sp binderFun = NULL;//BinderFunManager的binder客户端
#define TRANSAVTION_FUN 1

#ifndef NULL
#define NULL  (void*)0
#endif




#define TAG "NativeClient"

//获取系统服务BinderFunManager代理
sp  getBinderFunService()
{
	sp sm = defaultServiceManager();
	return sm->getService(String16("BinderFunManager")); 
}

extern "C" {

int  main(void)
{
	binderFun = getBinderFunService(); 
	Parcel data,reply;
	if(binderFun != NULL)
	{
    	static String16 mydescriptor = String16("com.xxx.binderapifun.server.BinderFunManager");
        data.writeInterfaceToken(mydescriptor);
		static String16 str = String16("I am client from Native call");
		
		
		data.writeString16(str);
		binderFun->transact(TRANSAVTION_FUN, data, &reply, 0);
		int result = reply.readInt32();
		LOGE(TAG,"transact result : %d\n", result);
		size_t datasize = reply.dataSize();
        const uint8_t *data = reply.data();

        for (int i = 0;i

最后附上完整的代码连接Binder实战大荟萃源码,由于原来牵涉到公司相关信息所以其中的xxx替换了，具体参见源码比较好！