求大神翻译这些代码

Declare Function checkCardReaderValid Lib "cardapi.dll" (ByVal lPort As Long) As String
Declare Function getImagePath Lib "cardapi.dll" () As String
Declare Function getPersonMsg Lib "cardapi.dll" (ByVal iPort As Long) As String
Declare Function getNewAddress Lib "cardapi.dll" (ByVal iPort As Long) As String
Declare Sub resetCardReader Lib "cardapi.dll" (ByVal iPort As Long)


把他翻译成C#语言应该是什么