The character displayed on the lobby screen can now be changed.

PlayerSetting_ChangeShowCard

GameServer/Server/CallGS/Handlers/Misc/PlayerSetting_ChangeShowCard.cs

@@ -0,0 +1,41 @@
+using MikuSB.Database;
+using MikuSB.Proto;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.Misc;
+
+[CallGSApi("PlayerSetting_ChangeShowCard")]
+public class PlayerSetting_ChangeShowCard : ICallGSHandler
+{
+    private const int ShowItemGirlIndex = 4;
+
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var player = connection.Player!;
+        var req = JsonSerializer.Deserialize<ChangeShowCardParam>(param);
+        if (req == null)
+            return;
+
+        var card = player.CharacterManager.GetCharacterByGUID(req.Id);
+        if (card == null)
+        {
+            await CallGSRouter.SendScript(connection, "PlayerSetting_ChangeShowCard", "{}");
+            return;
+        }
+
+        player.SetShowItem(ShowItemGirlIndex, card.Guid);
+        DatabaseHelper.SaveDatabaseType(player.Data);
+
+        var sync = new NtfSyncPlayer();
+        sync.ShowItems.AddRange(player.Data.ShowItems);
+
+        await CallGSRouter.SendScript(connection, "PlayerSetting_ChangeShowCard", "{}", sync);
+    }
+}
+
+internal sealed class ChangeShowCardParam
+{
+    [JsonPropertyName("nID")]
+    public uint Id { get; set; }
+}