System.EntryPointNotFoundException：無法找到一個切入點

我在執行它產生這個錯誤System.EntryPointNotFoundException：無法找到一個切入點

從VB6

Declare Function OpenCommPort Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal PortName As String, ByRef hCom As Long) As Long 
Declare Function CloseCommPort Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal hCom As Long) As Long 
Declare Function SetLED Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal hCom As Long, ByVal Led As Byte, ByVal Addr As Byte) As Long 
Declare Function ActiveBuzzer Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal hCom As Long, ByVal DelayTime As Byte, ByVal Addr As Byte) As Long 
Declare Function Iso14443Reqa Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal hCom As Long, ByVal ReqAMode As Byte, ByVal ATQ As String, ByVal Addr As Byte) As Long 
Declare Function Iso14443Anticoll Lib "C:\Program Files\MR705API.dll" Alias "[email protected]@[email protected]" (ByVal hCom As Long, ByVal AnticollMode As Byte, ByVal Uid As String, ByVal MultiTag As String, ByVal Addr As Byte) As Long

在C＃轉換VB6到C＃

 [DllImport ("MR705API.dll")] 
     public static extern long OpenCommPort(String portName, ref long hCom); 

     [DllImport ("MR705API.dll")] 
     public static extern long CloseCommPort(long hCom); 

     [DllImport ("MR705API.dll")] 
     public static extern long SetLED(long hCom, byte Led , byte Addr); 

     [DllImport ("MR705API.dll")] 
     public static extern long ActiveBuzzer (long hcom, byte DelayTime, byte Addr); 

     [DllImport ("MR705API.dll")] 
     public static extern long Iso14443Reqa (long hcom, byte ReqAMode, string ATQ, byte Addr);

以及我如何使用它..

public void doReader() { 

      Result = OpenCommPort("COM9", ref HANDLE); 
      .... 
      .... 
}

異常

System.EntryPointNotFoundException: Unable to find an entry point named 'OpenCommPort' in DLL 'MR705API.dll'. 

    at TrueReader.MainForm.OpenCommPort(String portName, Int64& hCom) 
    at TrueReader.MainForm.doReader() in c:\Users\sattha\Documents\SharpDevelop Projects\TrueReader\TrueReader\MainForm.cs:line 59 
    at TrueReader.MainForm.Timer1Tick(Object sender, EventArgs e) in c:\Users\sattha\Documents\SharpDevelop Projects\TrueReader\TrueReader\MainForm.cs:line 54 
    at System.Windows.Forms.Timer.OnTick(EventArgs e) 
    at System.Windows.Forms.Timer.TimerNativeWindow.WndProc(Message& m) 
    at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) 
    at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) 
    at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) 
    at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) 
    at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) 
    at System.Windows.Forms.Application.Run(Form mainForm) 
    at TrueReader.Program.Main(String[] args) in c:\Users\sattha\Documents\SharpDevelop Projects\TrueReader\TrueReader\Program.cs:line 27

任何一個可以指導我，我做了什麼錯？或者我錯過了什麼。

我不知道這個.dll如何寫以及用哪種語言寫的。

但它曾經在VB6中使用過。

來源

2014-10-30 Jongz Puangput

長在VB6將等同於.NET中的In32，所以你的PInvokes是錯誤的。如果找不到錯誤的sig匹配，那麼會導致錯誤 – Plutonix 2014-10-30 23:57:04

@Plutonix你的意思是我必須從long更改爲int32？ – 2014-10-30 23:57:51

@Plutonix它無法正常工作 – 2014-10-31 00:03:49

你應該VB6
DEFINE切入點EACH dllimport的功能

剛剛從Alias複製切入點，從您的VB6代碼到C＃

比如... 「OpenCommPort」

別名「OpenCommPort @@ YGHPADPAPAX @ Z」

TO - > 「OpenCommPort」在C＃

[DllImport ("MR705API.dll", EntryPoint="[email protected]@[email protected]")] public static extern int OpenCommPort(string portName, ref int hCom);

ADDINTIONAL在VB6

long相當於int C＃

來源

2014-11-05 23:22:21

System.EntryPointNotFoundException：無法找到一個切入點

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