cPP looks like this. How can I use ffi to call the Login method?

typedef struct _LoginInfo{
    LoginAuthType authType;
    char  *username;
    char  *userPassword;
    char  *appKey;
    char  *appToken;
    char  *timestamp;
    char  *MD5Token;
    _LoginInfo()
    {
        memset(this,0,sizeof(_LoginInfo));
    }

}ECLoginInfo;

EC_CALL_API int Login(const ECLoginInfo *loginInfo);