When sending UDP packets, the ports must be handled as specified in the data definition.怎么理解

这句话的意思是，在发送UDP数据报时，必须按照数据定义中指定的方式来处理端口。也就是说，发送方必须按照数据定义中规定的端口号将数据报发送到目标端口。接收方则需要按照相同的端口号来接收和处理数据报。这是因为UDP是一种无连接协议，没有像TCP一样的连接状态来保证数据传输的可靠性，因此需要通过端口号来确定数据报的发送和接收方。不过，具体端口的处理方式可能会因协议和应用程序的不同而有所差异，因此需要按照相应的规定来处理。

相关问题

E/CameraX: No default CameraXConfig.Provider specified in meta-data. The most likely cause is you did not include a default implementation in your build such as 'camera-camera2'. D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.photodiary, PID: 14237 java.lang.IllegalStateException: CameraX is not configured properly. The most likely cause is you did not include a default implementation in your build such as 'camera-camera2'. at androidx.camera.core.CameraX.<init>(CameraX.java:109) at androidx.camera.lifecycle.ProcessCameraProvider.getOrCreateCameraXInstance(ProcessCameraProvider.java:181) at androidx.camera.lifecycle.ProcessCameraProvider.getInstance(ProcessCameraProvider.java:167) at com.example.photodiary.Diary.startCamera(Diary.java:43) at com.example.photodiary.Diary.access$000(Diary.java:20) at com.example.photodiary.Diary$1.onClick(Diary.java:32) at android.view.View.performClick(View.java:7125) at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131) at android.view.View.performClickInternal(View.java:7102) at android.view.View.access$3500(View.java:801) at android.view.View$PerformClick.run(View.java:27336) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7356) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) I/Process: Sending signal. PID: 14237 SIG: 9

这个错误通常是由于在应用程序中没有正确配置 CameraX 导致的。在您的应用程序中，您需要在 AndroidManifest.xml 文件中添加一个 meta-data 元素，以指定默认的 CameraX 配置提供程序，如下所示：

<manifest ...>
    <application ...>
        <meta-data
            android:name="androidx.camera.default_config_provider"
            android:value="camera2" />
        ...
    </application>
</manifest>

在这个例子中，我们指定使用 Camera2 API 作为默认的 CameraX 配置提供程序。确保在应用程序中包含 CameraX 和 Camera2 API 的依赖项，以便正确地配置它们。

The specified 'scope' is invalid. openddict

The error message "The specified 'scope' is invalid" usually occurs when the requested scope is not valid or does not exist in the authorization server.

To resolve this error, you can try the following steps:

1. Double-check the scope parameter in your authorization request and ensure that it matches the defined scopes in the authorization server.

2. Check if the requested scope is supported by the authorization server, as some servers might have limited scopes available.

3. If you are using a third-party library or SDK to make the authorization request, make sure that it is configured correctly and is sending the correct scope parameter.

4. If none of the above steps work, you may need to contact the authorization server administrator or consult their documentation for more information on supported scopes.