First commit

TCPPortCheck.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.539
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{F184B08F-C81C-45F6-A57F-5ABD9991F28F}") = "TCPPortCheck", "TCPPortCheck\TCPPortCheck.vbproj", "{BA6DBEA9-E4BA-48D8-84C5-AE716927DA0E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BA6DBEA9-E4BA-48D8-84C5-AE716927DA0E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BA6DBEA9-E4BA-48D8-84C5-AE716927DA0E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BA6DBEA9-E4BA-48D8-84C5-AE716927DA0E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BA6DBEA9-E4BA-48D8-84C5-AE716927DA0E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1B1EB46B-794F-4330-AD79-E1A9E2DFF754}
+	EndGlobalSection
+EndGlobal

TCPPortCheck/Form1.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

TCPPortCheck/Form1.vb

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+Imports System.Net.Sockets
+
+Public Class Form1
+    Private Function _CheckTCPPort(ByVal sIPAdress As String, ByVal iPort As Integer, Optional ByVal iTimeout As Integer = 1000)
+        Dim socket As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
+        ' Connect using a timeout (default 5 seconds)
+        Dim result As IAsyncResult = socket.BeginConnect(sIPAdress, iPort, Nothing, Nothing)
+        Dim success As Boolean = result.AsyncWaitHandle.WaitOne(iTimeout, True)
+        If Not success Then
+            ' NOTE, MUST CLOSE THE SOCKET
+            socket.Close()
+            Return False
+        End If
+        Return True
+    End Function
+
+    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
+        Label1.Text = "测试中"
+        If _CheckTCPPort(TextBox1.Text, TextBox2.Text) = True Then
+            Label1.Text = "通"
+        Else
+            Label1.Text = "不通"
+        End If
+
+    End Sub
+
+    Private Sub TextBox2_KeyPress(sender As Object, e As KeyPressEventArgs) Handles TextBox2.KeyPress
+        If Not Char.IsDigit(e.KeyChar) And Not Char.IsControl(e.KeyChar) Then
+            e.Handled = True
+        End If
+    End Sub
+End Class

TCPPortCheck/My Project/Application.myapp

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+<?xml version="1.0" encoding="utf-8"?>
+<MyApplicationData xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+  <MySubMain>true</MySubMain>
+  <MainForm>Form1</MainForm>
+  <SingleInstance>false</SingleInstance>
+  <ShutdownMode>0</ShutdownMode>
+  <EnableVisualStyles>true</EnableVisualStyles>
+  <AuthenticationMode>0</AuthenticationMode>
+  <ApplicationType>0</ApplicationType>
+  <SaveMySettingsOnExit>true</SaveMySettingsOnExit>
+</MyApplicationData>

TCPPortCheck/My Project/AssemblyInfo.vb

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+Imports System
+Imports System.Reflection
+Imports System.Runtime.InteropServices
+
+' 有关程序集的一般信息由以下
+' 控制。更改这些特性值可修改
+' 与程序集关联的信息。
+
+'查看程序集特性的值
+
+<Assembly: AssemblyTitle("TCP Port Check")>
+<Assembly: AssemblyDescription("A Tool for check remote TCP Port is opened or closed")>
+<Assembly: AssemblyCompany("")>
+<Assembly: AssemblyProduct("TCP Port Check")>
+<Assembly: AssemblyCopyright("Copyright ©  2019")>
+<Assembly: AssemblyTrademark("")>
+
+<Assembly: ComVisible(False)>
+
+'如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+<Assembly: Guid("c36ba5ff-cfcf-4bd6-b06c-b2392586a2e1")>
+
+' 程序集的版本信息由下列四个值组成: 
+'
+'      主版本
+'      次版本
+'      生成号
+'      修订号
+'
+' 可以指定所有值，也可以使用以下所示的 "*" 预置版本号和修订号
+' 方法是按如下所示使用“*”: :
+' <Assembly: AssemblyVersion("1.0.*")>
+
+<Assembly: AssemblyVersion("1.0.0.0")>
+<Assembly: AssemblyFileVersion("1.0.0.0")>