Add extensions for getting instances of QQ and Group

mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/protocol/tim/packet/event/MessageEvent.kt

@@ -17,6 +17,7 @@ import net.mamoe.mirai.message.internal.readMessageChain
 import net.mamoe.mirai.network.protocol.tim.packet.PacketVersion
 import net.mamoe.mirai.network.protocol.tim.packet.action.ImageLink
 import net.mamoe.mirai.utils.*
+import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
 import net.mamoe.mirai.utils.io.*
 import net.mamoe.mirai.withSession
 import kotlin.jvm.JvmName
@@ -90,6 +91,16 @@ abstract class MessagePacketBase<TSender : QQ, TSubject : Contact> : EventPacket
     // endregion
 
     suspend inline fun At.qq(): QQ = bot.getQQ(this.target)
+
+    suspend inline fun Int.qq(): QQ = bot.getQQ(this.coerceAtLeastOrFail(0).toUInt())
+    suspend inline fun Long.qq(): QQ = bot.getQQ(this.coerceAtLeastOrFail(0))
+    suspend inline fun UInt.qq(): QQ = bot.getQQ(this)
+
+    suspend inline fun Int.group(): Group = bot.getGroup(this.coerceAtLeastOrFail(0).toUInt())
+    suspend inline fun Long.group(): Group = bot.getGroup(this.coerceAtLeastOrFail(0))
+    suspend inline fun UInt.group(): Group = bot.getGroup(GroupId(this))
+    suspend inline fun GroupId.group(): Group = bot.getGroup(this)
+    suspend inline fun GroupInternalId.group(): Group = bot.getGroup(this)
 }
 
 // region group message

mirai-demos/mirai-demo-gentleman/src/main/kotlin/demo/gentleman/Main.kt

@@ -9,7 +9,10 @@ import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
-import net.mamoe.mirai.*
+import net.mamoe.mirai.Bot
+import net.mamoe.mirai.BotAccount
+import net.mamoe.mirai.addFriend
+import net.mamoe.mirai.alsoLogin
 import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.contact.mute
 import net.mamoe.mirai.event.Subscribable
@@ -89,7 +92,7 @@ suspend fun main() {
         startsWith("profile", removePrefix = true) {
             val account = it.trim()
             if (account.isNotEmpty()) {
-                bot.getQQ(account.toUInt())
+                account.toUInt().qq()
             } else {
                 sender
             }.queryProfile().toString().reply()