Const GENERIC_READ = &H80000000
Const GENERIC_WRITE = &H40000000
Const OPEN_EXISTING = 3
Public Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _
(ByVal lpFileName As String, ByVal dwDesiredAccess As Integer, ByVal dwShareMode As Integer, ByVal lpSecurityAttributes As Integer, ByVal dwCreationDisposition As Integer, ByVal dwFlagsAndAttributes As Integer, ByVal hTemplateFile As Integer) As IntPtr
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Dim iHandle As IntPtr
iHandle = CreateFile("LPT1", GENERIC_READ Or GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0)
If (iHandle.ToInt32 = -1) Then
MsgBox("没有连接打印机或者打印机端口不是LPT1")
Exit Sub
Else
If i = 0 Then MsgBox("打印机连接成功!")
Dim fs As New FileStream(iHandle, FileAccess.ReadWrite)
Dim sr As New StreamReader(fs) '读数据
Dim sw As New StreamWriter(fs, System.Text.Encoding.Default) '写数据