Heartbeat packet, the code is good, can learn from. Mainly thought.

socket心跳包
............\ConsoleApplication2
............\...................\ConsoleApplication2
............\...................\ConsoleApplication2.sln
............\...................\ConsoleApplication2.suo
............\...................\...................\bin
............\...................\...................\...\Debug
............\...................\...................\...\.....\ConsoleApplication2.exe
............\...................\...................\...\.....\ConsoleApplication2.pdb
............\...................\...................\...\.....\ConsoleApplication2.vshost.exe
............\...................\...................\...\.....\ConsoleApplication2.vshost.exe.manifest
............\...................\...................\ConsoleApplication2.csproj
............\...................\...................\obj
............\...................\...................\...\x86
............\...................\...................\...\...\Debug
............\...................\...................\...\...\.....\ConsoleApplication2.csproj.FileListAbsolute.txt
............\...................\...................\...\...\.....\ConsoleApplication2.exe
............\...................\...................\...\...\.....\ConsoleApplication2.pdb
............\...................\...................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
............\...................\...................\...\...\.....\TempPE
............\...................\...................\Program.cs
............\...................\...................\Properties
............\...................\...................\..........\AssemblyInfo.cs
............\WindowsFormsApplication3
............\........................\WindowsFormsApplication3
............\........................\WindowsFormsApplication3.sln
............\........................\WindowsFormsApplication3.suo
............\........................\........................\bin
............\........................\........................\...\Debug
............\........................\........................\...\.....\WindowsFormsApplication3.exe
............\........................\........................\...\.....\WindowsFormsApplication3.pdb
............\........................\........................\...\.....\WindowsFormsApplication3.vshost.exe
............\........................\........................\...\.....\WindowsFormsApplication3.vshost.exe.manifest
............\........................\........................\...\Release
............\........................\........................\Form1.cs
............\........................\........................\Form1.Designer.cs
............\........................\........................\Form1.resx
............\........................\........................\obj
............\........................\........................\...\x86
............\........................\........................\...\...\Debug
............\........................\........................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
............\........................\........................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
............\........................\........................\...\...\.....\GenerateResource.read.1.tlog
............\........................\........................\...\...\.....\GenerateResource.write.1.tlog
............\........................\........................\...\...\.....\ResolveAssemblyReference.cache
............\........................\........................\...\...\.....\TempPE
............\........................\........................\...\...\.....\WindowsFormsApplication3.csproj.FileListAbsolute.txt
............\........................\........................\...\...\.....\WindowsFormsApplication3.exe
............\........................\........................\...\...\.....\WindowsFormsApplication3.Form1.resources
............\........................\........................\...\...\.....\WindowsFormsApplication3.pdb

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