指数超出范围.必须是非负数且小于集合的大小.参数名称:索引
本文关键字:集合 参数 索引 小于 范围 是非 指数 | 更新日期: 2023-09-27 18:20:55
我使用网络平台来验证我的用户以允许使用应用程序,但是如果可能的话,我有一些错误请求帮助我感谢您的帮助,我的错误是:
2013-07-04 15:06:14 - NPMessage: 调试: 调度 RPCAuthenticateValidateTicketMessage 2013-07-04 15:06:14 - NPMessage: 错误:System.ArgumentOutOfRangeException:索引超出范围。 必须是非负数且小于集合的大小。 参数名称:启动索引 at System.BitConverter.ToUInt64(Byte[] value, Int32 startIndex( at NPx.RPCAuthenticateValidateTicketMessage.ReadTicket(Byte[] bytes( at NPx.RPCAuthenticateValidateTicketMessage.Process(NPHandler client( at NPx.NPMessage.Process((
我的消息来源是:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using NPx;
namespace NPx
{
public partial class RPCAuthenticateValidateTicketMessage : NPRPCMessage<AuthenticateValidateTicketMessage>
{
public override void Process(NPHandler client)
{
var ipNum = (uint)IPAddress.NetworkToHostOrder(Message.clientIP);
var ip = new IPAddress(BitConverter.GetBytes(ipNum));
var ticket = ReadTicket(Message.ticket);
var npid = Message.npid;
if (npid == 0)
{
npid = ticket.clientID;
}
var valid = false;
var groupID = 0;
if (ticket.version == 1)
{
if (client.NPID == (long)ticket.serverID)
{
if (npid == ticket.clientID)
{
var remoteClient = NPSocket.GetClient((long)ticket.clientID);
remoteClient.CurrentServer = client.NPID;
if (remoteClient != null && !remoteClient.Unclean)
{
Log.Debug("Ticket auth: remote address " + remoteClient.Address.Address.ToString());
Log.Debug("Ticket auth: message address " + ip.ToString());
if (ipNum == 0 || remoteClient.Address.Address.Equals(ip))
{
valid = true;
groupID = remoteClient.GroupID;
Log.Debug("Successfully authenticated a ticket for client " + remoteClient.NPID.ToString("x16"));
}
else
{
Log.Debug("Ticket auth: IP address didn't match.");
}
}
else
{
Log.Debug("Ticket auth: no such client");
}
}
else
{
Log.Debug("Ticket auth: NPID didn't match.");
}
}
else
{
Log.Debug("Ticket auth: server NPID didn't match.");
}
}
else
{
Log.Debug("Ticket auth: version didn't match.");
}
var reply = MakeResponse<AuthenticateValidateTicketResultMessage>(client);
reply.Message.result = (valid) ? 0 : 1;
reply.Message.groupID = groupID;
reply.Message.npid = npid;
reply.Send();
}
private class NPTicket
{
public int version;
public ulong clientID;
public ulong serverID;
public uint time;
}
private NPTicket ReadTicket(byte[] bytes)
{
var ticket = new NPTicket();
ticket.version = BitConverter.ToInt32(bytes, 0);
if (ticket.version == 1)
{
ticket.clientID = BitConverter.ToUInt64(bytes, 4);
ticket.serverID = BitConverter.ToUInt64(bytes, 12);
ticket.time = BitConverter.ToUInt32(bytes, 20);
}
return ticket;
}
}
....
}
在访问其位置 0、4、12 和 20 之前,检查 private NPTicket ReadTicket(byte[] bytes)
内部bytes
的大小。
byte[] bytes
长度可能小于预期的索引 (0,4,12,20(
例如:
呼叫时
BitConverter.ToUInt64(bytes, 12);
此函数从指定的索引(第二个参数(遍历数组bytes
,并期望从字节 [12] 开始有 8 个字节,以便将它们转换为 int64。(ToInt32 需要 4 个字节(
所以你有2种情况:
==> 案例 1 :
bytes
的长度可能<13,这意味着字节[12]无效,因此它将抛出异常: 索引超出范围
尝试在调用索引之前检查字节 [] 的长度
==> 案例2 :
从指定索引开始的数组中没有足够的字节。例:如果您的数组bytes
长度为 15 ..调用BitConverter.ToUInt64(bytes, 12);
时将抛出异常,因为该函数将占用字节[12],字节[13],字节[14],字节[15](哎呀,有你的问题(。直到字节[19]。
为了进一步说明Siraj的观点,您可以尝试包装BitConverter调用...抓住
int machineUint = 0;
try
{
machineUint = BitConverter.ToUInt16(bytes, 12);
}
catch (IndexOutOfRangeException indexer)
{
machineUint = 0;
}
catch (Exception ex)
{
machineUint = 0;
}
错误时将产生 0,因为索引的输出超出范围异常和一般异常情况。