写了个测试的binder通信的代码，可是运行的时候显示transact函数返回数据错误Not a data message。代码如下
IServiceTest.h
```#ifndef __ISERVICETEST_H__ #define __ISERVICETEST_H__
#include <binder/IInterface.h> #include <binder/Parcel.h>
using android::status_t;
namespace android {
class IServiceTest:public IInterface{ public: DECLARE_META_INTERFACE(ServiceTest); virtual int setTest()= 0; virtual int getTest()= 0; };
class BnServiceTest:public BnInterface<IServiceTest>{ public: virtual status_t OnTransact(int code, const Parcel &data, Parcel *replay, int flag=0); };
};
#endif
```
IServiceTest.cpp #include <IServiceTest.h> #include <log.h> #include <utils/StrongPointer.h> #include <errno.h>
namespace android{
enum{ CODE_SET_TEST = IBinder::FIRST_CALL_TRANSACTION, CODE_GET_TEST, };
class BpServiceTest:public BpInterface<IServiceTest>{ public: BpServiceTest(const sp<IBinder> &impl) :BpInterface<IServiceTest>(impl) { }
virtual int setTest() {
Parcel data,reply; data.writeInterfaceToken(IServiceTest::getInterfaceDescriptor()); status_t status = remote()->transact(CODE_SET_TEST,data,&reply); if(status != NO_ERROR){ BINDER_LOG_ERROR("transact error,%d,%s\n",status,strerror(-status)); } return (int)status; }
virtual int getTest() { Parcel data,reply; data.writeInterfaceToken(IServiceTest::getInterfaceDescriptor()); status_t status = remote()->transact(CODE_GET_TEST,data,&reply); if(status != NO_ERROR){ BINDER_LOG_ERROR("getTest transact error,%d\n",status); } return (int)status; } };
IMPLEMENT_META_INTERFACE(ServiceTest,"android.test.IServiceTest");
status_t BnServiceTest::OnTransact(int code,const Parcel & data,Parcel * replay,int flag) { BINDER_LOG_DEBUG("code =%d\n",code); switch(code){ case CODE_SET_TEST: CHECK_INTERFACE(IServiceTest,data,replay) setTest(); break; case CODE_GET_TEST: CHECK_INTERFACE(IServiceTest,data,replay) getTest(); break; } return NO_ERROR; } };
```
``` Client端 main函数 #include <IServiceTest.h> #include <binder/IServiceManager.h> #include <utils/StrongPointer.h> #include <log.h>
using namespace android;
int main(int argc,char **argv) { sp<IBinder> test = defaultServiceManager()->getService(String16("service.test")); if(test == NULL){ BINDER_LOG_ERROR("can not get service\n"); return -1; } sp<IServiceTest> ptest = IServiceTest::asInterface(test); if(ptest == NULL){ BINDER_LOG_ERROR("can not get proxy class ptest"); return -1; } ptest->setTest(); ptest->getTest(); }
```
```
Server端 ServiceTest.h #ifndef __SERVICETEST_H__ #define __SERVICETEST_H__
#include <IServiceTest.h>
namespace android{
using android::status_t;
class ServiceTest:public BnServiceTest{ public: static void instance(); virtual int setTest(); virtual int getTest(); virtual status_t OnTransact(int code,const Parcel & data,Parcel* replay,int flag = 0); };
}; #endif
```
``` ServiceTest.cpp #include <ServiceTest.h> #include <binder/IServiceManager.h> #include <log.h> #define INTERFACE_DESCRiPTOR "service.test" namespace android{
void ServiceTest::instance() { defaultServiceManager()->addService((String16)INTERFACE_DESCRiPTOR,new ServiceTest()); } int ServiceTest::setTest() { BINDER_LOG_DEBUG("%s\n",__FUNCTION__); return 0; }
int ServiceTest::getTest() { BINDER_LOG_DEBUG("%s\n",__FUNCTION__); return 0; } status_t ServiceTest::OnTransact(int code,const Parcel & data,Parcel * replay,int flag) { return BnServiceTest::OnTransact(code,data,replay,flag); }
};
main函数 #include <ServiceTest.h> #include <utils/StrongPointer.h> #include <binder/ProcessState.h> #include <binder/IPCThreadState.h>
using namespace android;
int main(int argc,char **argv) { ServiceTest::instance(); ProcessState::self()->startThreadPool(); IPCThreadState::self()->joinThreadPool(); return 0; }
```
``` 麻烦哪位大神帮小弟看看这里有什么问题 错误是05-22 13:53:59.741 1685 1685 E binder_test: transact error,-74,Not a data message 05-22 13:53:59.741 1685 1685 E binder_test: getTest transact error,-74
多谢
