How to access the Android framework layer Wifiservice directly from C + + code

In the final analysis, the Java Layer Service is the encapsulation of the C + + layer binder, so it is entirely possible, in principle, to access the service of the Android framework layer directly through C + + code, this article takes a visit to Wifiservice as an example, Explain how to implement this function.

Crap less, directly on the code:

WifiTest.cpp

#include <sys/types.h> #include <unistd.h> #include <grp.h> #include <binder/ipcthreadstate.h > #include <binder/ProcessState.h> #include <binder/IServiceManager.h> #include <utils/log.h># Include <utils/string16.h>//#include <utils/Vector.h> #include <utils/List.h> #include <utils/ Propertymap.h>using namespace Android, #define WIFI_SERVICE "WIFI" Const STRING16 wifi_descriptor (" Android.net.wifi.IWifiManager "), Class scanresult{private:scanresult& operator= (const scanresult& o);p ublic : Scanresult (const scanresult& O): Mssid (O.mssid), Mbssid (O.mbssid), Mcaps (O.mcaps), Mlevel (o.mlevel), MFrequenc Y (o.mfrequency), Mtimestamp (O.mtimestamp) {} scanresult (String8 ssid,string16 bssid,string16 caps,int level,int F req,int64_t timeStamp): Mssid (SSID), Mbssid (BSSID), mcaps (Caps), mlevel (level), Mfrequency (Freq), Mtimestamp (        TimeStamp) {} void Dump () {char temp[130];        int size; MeMset (temp,0,sizeof (temp));        printf ("SSID%s \ n", mssid.string ());        Size = Mbssid.size ();        if (Size > sizeof (temp)/2-1) {size = sizeof (temp)/2-1;        } Utf16_to_utf8 (Mbssid.string (), size, temp);        printf ("Bssid%s \ n", temp);        Size = Mcaps.size ();        if (Size > sizeof (temp)/2-1) {size = sizeof (temp)/2-1;        } Utf16_to_utf8 (Mcaps.string (), size, temp);        printf ("SSID%s \ n", temp);        printf ("Level%d \ n", mlevel);        printf ("Freq%d \ n", mfrequency);    printf ("Freq%ld \ n", Mtimestamp);    }private:string8 Mssid;    String16 Mbssid;    String16 Mcaps;    int mlevel;    int mfrequency; int64_t Mtimestamp;}; Class Iwifiservice:public Android::iinterface {public:declare_meta_interface (wifiservice) virtual void STA        Rtscan (int forceactive) = 0;        virtual int getscanresults (list<scanresult> &list) = 0; virtual BOOL Setwifienabled (boolenable) = 0;};        Class Bpwifiservice:public android::bpinterface<iwifiservice>{enum {first_call_transaction = 1, Transaction_getconfigurednetworks = (android::ibinder::first_call_transaction + 0), Transaction_addorupdatenetwo RK = (android::ibinder::first_call_transaction + 1), Transaction_removenetwork = (Android::ibinder::first_call_tran Saction + 2), Transaction_enablenetwork = (android::ibinder::first_call_transaction + 3), transaction_disabl Enetwork = (android::ibinder::first_call_transaction + 4), transaction_pingsupplicant = (Android::ibinder::first_ca Ll_transaction + 5), Transaction_startscan = (android::ibinder::first_call_transaction + 6), TRANSACTION_get Scanresults = (android::ibinder::first_call_transaction + 7), Transaction_disconnect = (android::ibinder::first_cal L_transaction + 8), Transaction_reconnect = (android::ibinder::first_call_transaction + 9), Transaction_reas Sociate =(Android::ibinder::first_call_transaction +), Transaction_getconnectioninfo = (Android::ibinder::first_call_tran Saction + one), transaction_setwifienabled = (android::ibinder::first_call_transaction +), Transaction_get Wifienabledstate = (android::ibinder::first_call_transaction +), Transaction_setcountrycode = (android::IBinder:        : First_call_transaction + +), Transaction_setfrequencyband = (android::ibinder::first_call_transaction + 15), Transaction_getfrequencyband = (android::ibinder::first_call_transaction + +), transaction_isdualbandsupported = (android::ibinder::first_call_transaction + +), Transaction_saveconfiguration = (android::ibinder::first_call_tr Ansaction + +), Transaction_getdhcpinfo = (android::ibinder::first_call_transaction + +), Transaction_acqu Irewifilock = (android::ibinder::first_call_transaction +), Transaction_updatewifilockworksource = (android::IBi Nder::first_call_transaction +), Transaction_releasewifilock = (android::ibinder::first_call_transaction +), Transaction_initi Alizemulticastfiltering = (android::ibinder::first_call_transaction +), transaction_ismulticastenabled = (androi D::ibinder::first_call_transaction +), Transaction_acquiremulticastlock = (android::ibinder::first_call_transact ION +), Transaction_releasemulticastlock = (android::ibinder::first_call_transaction +), transaction_s etwifiapenabled = (android::ibinder::first_call_transaction +), Transaction_getwifiapenabledstate = (Android::IB  Inder::first_call_transaction +), transaction_getwifiapconfiguration = (android::ibinder::first_call_transaction +), Transaction_setwifiapconfiguration = (android::ibinder::first_call_transaction +), Transaction_st Artwifi = (android::ibinder::first_call_transaction +), Transaction_stopwifi = (Android::ibinder::first_call_tra Nsaction + +), TRansaction_addtoblacklist = (android::ibinder::first_call_transaction +), Transaction_clearblacklist = (android: : Ibinder::first_call_transaction +), Transaction_getwifiservicemessenger = (Android::ibinder::first_call_transac tion + +), Transaction_getwifistatemachinemessenger = (android::ibinder::first_call_transaction + +), TRAN Saction_getconfigfile = (android::ibinder::first_call_transaction + notoginseng), Transaction_captiveportalcheckcomplete = ( Android::ibinder::first_call_transaction + +),};p ublic:bpwifiservice (const ANDROID::SP&LT;ANDROID::IBINDER&GT        ;& impl): android::bpinterface<iwifiservice> (impl) {} void Startscan (int forceactive)            {android::P arcel data, reply;            Data.writeinterfacetoken (Wifi_descriptor);            if (forceactive) {data.writeint32 (1);            } else {data.writeint32 (0);    }        Remote ()->transact (Transaction_startscan, data, &reply, 0);            } virtual int getscanresults (list<scanresult> &list) {Parcel data, reply;            Data.writeinterfacetoken (Wifi_descriptor);            Remote ()->transact (transaction_getscanresults, data, &reply, 0);            if (0! = Reply.readexceptioncode ()) {return 0;            } int count = Reply.readint32 ();                for (int i=0;i<count;i++) {String8 SSID;                int res = Reply.readint32 ();                    if (res! = 0) {reply.readint32 ();                    Reply.readint32 ();                    int length = Reply.readint32 ();                SSID = String8 ((const char*) reply.readinplace (length), length);                }//Utf16_to_utf8 (const char16_t* SRC, size_t src_len, char* DST); String16 BSSID = Reply.readstring16 ();                String16 caps = Reply.readstring16 ();                int level = Reply.readint32 ();                int frequency = Reply.readint32 ();                int64_t timestamp = Reply.readint64 ();                Scanresult result (Ssid,bssid,caps,level,frequency,timestamp);            List.push_back (result);        } return count;            } bool Setwifienabled (bool enable) {Parcel data, reply;            Data.writeinterfacetoken (Wifi_descriptor);            if (enable) Data.writeint32 (1);            else Data.writeint32 (0);            Remote ()->transact (transaction_setwifienabled, data,&reply,0);            Reply.readexceptioncode ();        return 0!=reply.readint32 (); }};implement_meta_interface (Wifiservice, wifi_descriptor) int main (int argc, char *argv[]) {android::sp<android::i    servicemanager> sm = android::d Efaultservicemanager (); Android::sp<android::ibinder> Binder;   Android::sp<iwifiservice> WiFi;    Binder = Sm->getservice (Android::string16 (Wifi_service));    if (binder = = 0) {return 1;    WiFi = android::interface_cast<iwifiservice> (binder); Wifi->setwifienabled (True);p rintf ("+++++scan start"); Wifi->startscan (1); for (int i=0;i<10;i++) {usleep (1* 1000*1000); list<scanresult> list;wifi->getscanresults (list); if (list.size () > 0) {for (list<scanresult>::i        Terator it = List.begin (); It! = List.end (); ++it) {(*it). dump ();    } break; }} return (0);}

The basic idea is simple:

First Pass:

Android::d Efaultservicemanager ()->getservice (Android::string16 (Wifi_service));

Obtain binder interface, and then through parcel read with binder, concrete implementation can refer to Iwifimanager.java code.

Running the above code after compiling can get output similar to the following:

SSID Wifitest
Bssid b8:55:10:84:13:57
SSID [Wpa-psk-ccmp][wpa2-psk-ccmp][wps][ess]
Level-55
Freq 2447
Time Stamp 1073922473

SSID Test
Bssid 08:bd:43:c3:a9:96
SSID [Wpa2-psk-ccmp][wps][ess]
level-66
Freq 2462
Time Stamp 1073922473

Full code Download:

http://download.csdn.net/detail/i2cbus/7613361