## When to Use<a name="section18502174174019"></a>
## When to Use
IPC/RPC enables a proxy and a stub that run on different processes to communicate with each other, regardless of whether they run on the same or different devices.
## Available APIs<a name="section1633115419401"></a>
<tdclass="cellrowborder"valign="top"width="33.33333333333333%"headers="mcps1.2.4.1.3 "><pid="p13885724405"><aname="p13885724405"></a><aname="p13885724405"></a>Obtains the holder of a remote proxy object. This method must be implemented by the derived classes of <strongid="b18927631105113"><aname="b18927631105113"></a><aname="b18927631105113"></a>IRemoteBroker</strong>. If you call this method on the stub, the <strongid="b7932163110519"><aname="b7932163110519"></a><aname="b7932163110519"></a>RemoteObject</strong> is returned; if you call this method on the proxy, the proxy object is returned.</p>
<tdclass="cellrowborder"valign="top"width="33.33333333333333%"headers="mcps1.2.4.1.3 "><pid="p1188582414016"><aname="p1188582414016"></a><aname="p1188582414016"></a>Called to process a request from the proxy and return the result. Derived classes need to override this method.</p>
<tdclass="cellrowborder"valign="top"width="33.33333333333333%"headers="mcps1.2.4.1.3 "><pid="p688592413018"><aname="p688592413018"></a><aname="p688592413018"></a>Service proxy classes are derived from the <strongid="b169739356519"><aname="b169739356519"></a><aname="b169739356519"></a>IRemoteProxy</strong> class.</p>
</td>
</tr>
</tbody>
</table>
## How to Develop<a name="section4207112818418"></a>
| IRemoteBroker | sptr\<IRemoteObject> AsObject() | Obtains the holder of a remote proxy object. This method must be implemented by the derived classes of **IRemoteBroker**. If you call this method on the stub, the **RemoteObject** is returned; if you call this method on the proxy, the proxy object is returned. |
| IRemoteStub | virtual int OnRemoteRequest(uint32_t code, MessageParcel &data, MessageParcel &reply, MessageOption &option) | Called to process a request from the proxy and return the result. Derived classes need to override this method. |
| IRemoteProxy | | Service proxy classes are derived from the **IRemoteProxy** class. |
## How to Develop
**Using Native APIs**
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@@ -60,7 +34,7 @@ IPC/RPC enables a proxy and a stub that run on different processes to communicat
2. Define and implement service provider **TestAbilityStub**.
This class is related to the IPC framework and needs to inherit **IRemoteStub<ITestAbility\>**. You need to override **OnRemoteRequest** on the stub to receive requests from the proxy.
This class is related to the IPC framework and needs to inherit **IRemoteStub\<ITestAbility>**. You need to override **OnRemoteRequest** on the stub to receive requests from the proxy.
```
class TestAbilityStub : public IRemoteStub<ITestAbility> {
...
...
@@ -100,7 +74,7 @@ IPC/RPC enables a proxy and a stub that run on different processes to communicat
4. Define and implement **TestAbilityProxy**.
This class is implemented on the proxy and inherits **IRemoteProxy<ITestAbility\>**. You can call **SendRequest** to send a request to the stub and expose the capabilities provided by the stub.
This class is implemented on the proxy and inherits **IRemoteProxy\<ITestAbility>**. You can call **SendRequest** to send a request to the stub and expose the capabilities provided by the stub.
```
class TestAbilityProxy : public IRemoteProxy<ITestAbility> {
...
...
@@ -157,5 +131,3 @@ IPC/RPC enables a proxy and a stub that run on different processes to communicat
sptr<IRemoteObject> remoteObject = samgr->GetSystemAbility(sdid, deviceId); // deviceId identifies a device.
sptr<TestAbilityProxy> proxy(new TestAbilityProxy(remoteObject)); // Construct a proxy.
