小编Chr*_*ard的帖子

我目前使用 WFAPI 从 C# 确定 Citrix 会话的客户端 IP 地址

[StructLayout(LayoutKind.Sequential)]
internal struct WF_CLIENT_ADDRESS {
    public int AddressFamily;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 20)]
    public byte[] Address;
}

[DllImport("WFAPI.dll", EntryPoint = "WFFreeMemory")]
private static extern void WFFreeMemory(IntPtr pMemory);

[DllImport("WFAPI.dll", EntryPoint = "WFQuerySessionInformationA")]
private static extern bool WFQuerySessionInformation(IntPtr hServer, 
    int iSessionId, int infotype, out IntPtr ppBuffer, out int pBytesReturned);

const int ClientAddress = 14;
const int CurrentSession = -1;
static readonly IntPtr CurrentServer = IntPtr.Zero;

public static string GetClientAddress() {
    IntPtr addr;
    int returned; …

任何人都可以解释在新实例化的utf8编码上调用GetPreamble()与在Encoding类中提供的公共编码之间的区别吗？

byte[] p1 = Encoding.UTF8.GetPreamble();
byte[] p2 = new UTF8Encoding().GetPreamble();

p1是正常的3字节utf-8前导码,但p2最终为空,这似乎非常错误.