Update README.md

README.md

@@ -4,22 +4,29 @@
 
 ### 如何使用
 ```
-using var divert = new WinDivert("true", WinDivertLayer.Network);
+var filter = Filter.True
+    .And(f => f.Network.Loopback)
+    .And(f => f.Tcp.DstPort == 443)
+    .And(f => f.Tcp.Ack == true);
+    
+using var divert = new WinDivert(filter, WinDivertLayer.Network);
 using var packet = new WinDivertPacket();
 var addr = new WinDivertAddress();
 
-// 读包
-divert.Recv(packet, ref addr);
+while(true)
+{
+    // 读包
+    divert.Recv(packet, ref addr);
 
-// 解包
-var result = packet.GetParseResult();
+    // 解包
+    var result = packet.GetParseResult();
 
-// 改包
-result.TcpHeader->DstPort = 443; 
+    // 改包
+    result.TcpHeader->DstPort = 443; 
 
-// 重算checksums
-packet.CalcChecksums(ref addr);
-
-// 修改后发出
-divert.Send(packet, ref addr);
+    // 重算checksums
+    packet.CalcChecksums(ref addr);
 
+    // 修改后发出
+    divert.Send(packet, ref addr);
+}