嗨，我在C ++ MFC中有2个方法，分别调用long* lpHandle和long lHandle。我想将这些调用转换为C＃。

C ++ MFC示例：

//The api methods
NETCLIENT_API int   API_CALL    NETCLIENT_MCOpenconfig(long* lpHandle);

NETCLIENT_API int   API_CALL    NETCLIENT_MCConfig(const char* szDevIDNO,int nType,GPSConfigData_S* pConfig,void* pUsr,void (CALLBACK * FUnmCMsgCB)(GPSMCMsg_S* pMsg,void* pUsr),long lHandle);

...
... 

    CDlgTransParam::CDlgTransParam(CWnd* pParent /*=NULL*/)
    : CDialog(CDlgTransParam::IDD,pParent)
{
    //set handle to null
    m_lParamHandle = NULL;
}

...
... 

void CDlgTransParam::DoConfig(CString strIDNO,GPSConfigData_S* lpInconfig)
{
    //opens config handle
    NETCLIENT_MCOpenconfig(&m_lParamHandle);
    // Sends message; //m_lParamHandle is the return handle of NETCLIENT_MCOpenconfig
    NETCLIENT_MCConfig(strIDNO,nType,lpInconfig,this,FUNGetDevConfig,m_lParamHandle);
}

我一直在进行的C＃Winform转换：

//Delegate methods
[UnmanagedFunctionPointer(CallingConvention.StdCall)]
public delegate void FUnmCMsgCB(int nmsg,Form1 form1);

class NETCLASS
{
//--
[DllImport("libnetclient.dll",CallingConvention = CallingConvention.StdCall)]
public static extern int NETCLIENT_MCOpenconfig(_x);
//--
[DllImport("libnetclient.dll",CallingConvention = CallingConvention.StdCall)]
public static extern int NETCLIENT_MCConfig(string szDevIDNO,string pConfig,Form1 form1,FUnmCMsgCB _callback,_x);
}

...
...

 private void Sendbutton_Click(object sender,EventArgs e)
{
  //opens config handle
  int handle = NETCLASS.NETCLIENT_MCOpenconfig(_x);
  // Sends message; //m_lParamHandle is the return handle of NETCLIENT_MCOpenconfig
  FUnmCMsgCB _callback = new FUnmCMsgCB(FUnmCMsgCB);
  int param3 = NETCLASS.NETCLIENT_MCConfig(szDevIDNO,pdata,_callback,_x);
}

在C＃示例中，您将看到_x。根据{{​​3}}。 C ++ long在C＃中转换为int。 我试过这样定义：

        int str = 0;//set value to zero
        GCHandle handlel = GCHandle.Alloc(str,GCHandleType.Weak);//handle type
        IntPtr pointer = GCHandle.ToIntPtr(handlel);//define pointer
        int lHandle = pointer.ToInt32();//convert to int

它没有用。我还注意到long类型的变量名是lpHandle，如api方法（e.g "long* lpHandle"）中所述。在C＃中是Intptr，所以我自然尝试使用Intptr和ref Intptr，如：

NETCLIENT_MCOpenconfig(ref IntPtr lHandle);//ref pointer
NETCLIENT_MCOpenconfig(IntPtr lHandle);//normal pointer

仍然没有运气。如果有人有任何建议或提示，我将不胜感激。