我已将VB6转换为c#,同时执行它会生成此错误
FROM VB6
Declare Function OpenCommPort Lib "C:\Program Files\MR705API.dll" Alias "?OpenCommPort@@YGHPADPAPAX@Z" (ByVal PortName As String, ByRef hCom As Long) As Long
Declare Function CloseCommPort Lib "C:\Program Files\MR705API.dll" Alias "?CloseCommPort@@YGHPAX@Z" (ByVal hCom As Long) As Long
Declare Function SetLED Lib "C:\Program Files\MR705API.dll" Alias "?SetLED@@YGHPAXEE@Z" (ByVal hCom As Long, ByVal Led As Byte, ByVal Addr As Byte) As Long
Declare Function ActiveBuzzer Lib "C:\Program Files\MR705API.dll" Alias "?ActiveBuzzer@@YGHPAXEE@Z" (ByVal hCom As Long, ByVal DelayTime As Byte, ByVal Addr As Byte) As Long
Declare Function Iso14443Reqa Lib "C:\Program Files\MR705API.dll" Alias "?Iso14443Reqa@@YGHPAXEPAEE@Z" (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 "?Iso14443Anticoll@@YGHPAXEPAE1E@Z" (ByVal hCom As Long, ByVal AnticollMode As Byte, ByVal Uid As String, ByVal MultiTag As String, ByVal Addr As Byte) As Long
IN 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);
....
....
}
异常
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
任何人都可以指导我,我做错了什么?或者我错过了什么。
我不知道这个.dll是如何写的以及用哪种语言写的。
但之前在VB6中使用过。
答案 0 :(得分:2)
你应该为每个DLLIMPORT函数定义入口点
只需将Alias
的入口点从VB6代码复制到C#
例如...... VB6中的“OpenCommPort”
Alias“?OpenCommPort @@ YGHPADPAPAX @ Z”
TO - > C#中的“OpenCommPort”
[DllImport ("MR705API.dll",
EntryPoint="?OpenCommPort@@YGHPADPAPAX@Z")]
public static extern int OpenCommPort(string portName, ref int hCom);
<强> ADDINTIONAL 强>
VB6 中的 long
相当于 C#中的int