关于c#调用c++的dll

最近在研究使用c++制作的sdk开发视频监控,数据类型的对应简直头痛不已,参考了以下地址来封装api,http://www.cnblogs.com/over140/category/172369.html,但是按照里面的参数对应方式,虽然函数调用没有报错,但是始终无法正确登陆视频服务器,如下:

c++里面:
定义:
KTNET_API KTERR_CODE WINAPI KTNET_LogonServer(IN  char *pServerIP,IN  WORD wServerPort,IN  char *pDeviceName,IN char *pUserName,IN char *pUserPassword,IN DWORD dwClientID,OUT  HANDLE &hLogonServer,IN HWND hNotifyWindow = NULL);

使用:
errCode = HHNET_LogonServer(szRegisterIP,
    wRegisterDataPort,
    (char *)(const char *)m_sDeviceName,
    (char *)(const char *)m_sUserName,
    (char *)(const char *)m_sUserPsw,
    0,
    hLogon);
相关参数的定义:
char szRegisterIP[128];
WORD wRegisterDataPort;
CString         m_sDeviceName;
CString         m_sUserName;
CString         m_sUserPsw;


m_sIP = _T("192.168.55.120");
m_sDeviceName = _T("NVS");
m_nPort = 5000;
m_sUserName = _T("Admin");
m_sUserPsw = _T("123456");
strcpy(szRegisterIP,this->m_sIP);
wRegisterDataPort = (WORD)this->m_nPort;


在c#里面我是这样调用的: