Question

我正在构建网络扫描实用程序应用程序，并且在列表视图中显示字符串时遇到了一些问题。

我通过套接字请求和字节编码找到本地远程计算机的Netbios名称，当我在listview中显示结果时，域名根本不显示，但是当我导出该listview行子项目的文本时它包含.csv文件中机器的NetBios名称，它正确显示整个字符串，例如“COMPUTER1-WORKGROUP”，例如在listview中它只显示“COMPUTER1”。

在这里，您可以在windows应用程序的列表视图中看到显示：

正如您在第一行的“Nom Netbios”栏中所见，它只显示“NVRSERVEUR”

然后当我获取ListViewItem.SubItem.Text并将其写入.csv文件时，如下图所示，它显示“NVRSERVEUR-IRIS”，其中IRIS代表网络域名。

以下是我用于检索netbios计算机名称和网络域名的任务的代码：

static Task<NetworkInfosWrapper> getNetBiosNameAsyncReply(PingReply reply)
    {
        var tcs = new TaskCompletionSource<NetworkInfosWrapper>();
        byte[] receiveBuffer = new byte[1024];
        Socket requestSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        requestSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 100);
        EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Parse(reply.Address.ToString()), 137);
        IPEndPoint originEndPoint = new IPEndPoint(IPAddress.Any, 0);
        requestSocket.Bind(originEndPoint);
        SocketAsyncEventArgs e = new SocketAsyncEventArgs();
        e.SetBuffer(NameRequest, e.Offset, NameRequest.Count());
        e.RemoteEndPoint = remoteEndPoint;
        e.Completed += (obj, sender) =>
        {
            try
            {
                int receivedByteCount = requestSocket.ReceiveFrom(receiveBuffer, ref remoteEndPoint);
                if (receivedByteCount >= 90)
                {
                    Encoding enc = new UTF8Encoding();
                    //Encoding enc = new ASCIIEncoding();

                    string deviceName = enc.GetString(receiveBuffer, 57, 16).Trim();
                    string networkName = enc.GetString(receiveBuffer, 75, 16).Trim();

                    tcs.SetResult(new NetworkInfosWrapper(reply,(deviceName.Trim()+" - "+networkName.Trim()).Replace(" ", "")));

                }
                else
                {
                    tcs.SetResult(new NetworkInfosWrapper(reply, "N/A"));
                }
            }
            catch
            {
                tcs.SetResult(new NetworkInfosWrapper(reply, "N/A"));
            }

        };
        requestSocket.SendToAsync(e);
        return tcs.Task;
    }

以下是我在主扫描功能列表视图中显示的方式：

foreach (var netbiosTask in netbiosTasks)
        {
            if (netbiosTask.Result.reply.Status == IPStatus.Success)
            {
                ListViewItem lvi;
                addr = IPAddress.Parse(netbiosTask.Result.reply.Address.ToString());
                string mac = ScanUtils.getMacByIp(netbiosTask.Result.reply.Address.ToString());

                lvi = new ListViewItem(ScanUtils.GetReverseDNS(netbiosTask.Result.reply.Address.ToString(),1000));
                lvi.SubItems.Add(netbiosTask.Result.reply.Address.ToString());
                lvi.SubItems.Add("UP");
                lvi.SubItems.Add(netbiosTask.Result.reply.RoundtripTime.ToString() + " ms");
                lvi.SubItems.Add(netbiosTask.Result.netBiosName);
                lvi.SubItems.Add(mac);
                lvi.SubItems.Add(ScanUtils.getMacvendor(mac));
                listView.Items.Add(lvi);
                if(progressBar1.Value < progressBar1.Maximum) {
                    progressBar1.Value = progressBar1.Value + 1;
                }
                if (!mStopThread)
                {
                    break;
                }
            }
        }

以下是将listview的内容导出为.csv文件的方法：

private void enregistrerBtn_Click(object sender, EventArgs e)
    {
        StringBuilder csvContent = new StringBuilder();
        csvContent.AppendLine("sep=;");
        csvContent.AppendLine("Hostname;Adresse IP;Netbios;Adresse Mac;Mac Vendor");

        foreach (ListViewItem item in listView.Items)
        {
            csvContent.AppendLine(string.Format("{0};{1};{2};{3};{4}", item.SubItems[0].Text, item.SubItems[1].Text, item.SubItems[4].Text, item.SubItems[5].Text, item.SubItems[6].Text));
        }

        string csvPath = Path.GetDirectoryName(System.AppDomain.CurrentDomain.BaseDirectory).ToString() + @"\Resources\networkScan"+ DateTime.Now.ToString("dd-MM-yyyy-hh-mm-ss") +".csv";

        File.AppendAllText(csvPath, csvContent.ToString(),Encoding.UTF8);
    }

我尝试将ASCII和UTF-8编码用于csv写入和套接字响应的字节编码。还有其他人遇到过这种问题吗？

Answer 1

默认情况下，

Trim不会从字符串中删除空字节，只会删除空白字符。专门应用Trim来删除空字节，如下所示：

string deviceName = enc.GetString(receiveBuffer, 57, 16).Trim('\0');
string networkName = enc.GetString(receiveBuffer, 75, 16).Trim('\0');

是否在null字节后看到字符串的部分取决于您显示它们的方式。列表视图在看到空字节时停止打印文本，用于查看CSV文件的编辑器（Excel？）似乎能够在空字节后继续。

C＃字符串在WindowsForm App

1 个答案: