小编Nag*_*j M的帖子

如何获取从另一个函数struct返回的 a的值Result？下面举例。

#[derive(Debug)]
pub struct Keypair(ed25519_dalek::Keypair);

pub fn keypair_from_seed(seed: &[u8]) -> Result<Keypair, Box<dyn error::Error>> {
    let dalek_keypair = ed25519_dalek::Keypair { secret, public };
    Ok(Keypair(dalek_keypair))
}

fn main(){
  //here seed_bytes is mnemonics
  let sk = keypair_from_seed(&seed_bytes);
  //sk contains the secret key and public key, i want to extract it different secret key & public key
}

我正在尝试在我的 Telerik 应用程序构建器“ https://github.com/fechanique/cordova-plugin-fcm ”中使用 FCM 进行推送通知我收到错误 “命名空间前缀 android 未定义”并且我的函数getToken不起作用

<plugin xmlns="http://apache.org/cordova/ns/plugins/1.0"
       id="cordova-plugin-fcm"
       version="2.1.1">
<name>FCMPlugin</name>
<description>Cordova FCM Plugin</description>
<license>Apache 2.0</license>
<keywords>cordova, fcm, push, plugin</keywords>

<info>
    Cordova FCM plugin v2.1.1 installed
    For more details visit https://github.com/fechanique/cordova-plugin-fcm
</info>

<js-module src="www/FCMPlugin.js" name="FCMPlugin">
<clobbers target="FCMPlugin" />
</js-module>

<engines>
<engine name="cordova-android" version=">=4.0.0" />
</engines>

<!-- ANDROID CONFIGURATION -->


<platform name="android">
    <config-file target="AndroidManifest.xml" parent="/manifest/application">
        <activity android:exported="true" android:name="com.gae.scaffolder.plugin.FCMPluginActivity" android:launchMode="singleTop">
            <intent-filter>   
                <action android:name="FCM_PLUGIN_ACTIVITY" />  
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>            
        </activity>
        <service android:name="com.gae.scaffolder.plugin.MyFirebaseMessagingService">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter> …