C#调用C写的DLL二级指针传递方法

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最近在做一项目需要调用第3方DLL(c写的),其中有个参数是2级指针,查了很多资料终于搞定

1、函数原形

方法原式:
int Quest_goodsA(CHAR* flowno ,CHAR* salesman,int offlinenum,CHAR* offlinegoods,int onlinenum,CHAR* onlinegoods,CHAR** password,CHAR** memo)

2、C#引用声明:

[DllImport("POSCOMM.dll", CharSet = CharSet.Ansi)]
public static extern IntPtr Quest_goods(string flowno, string salesman, int offlinenum, string offlinegoods, int onlinenum, string onlinegoods, ref string password, ref string memo);

3、C# 调用：

string strPwd = new string(' ', 200);
string strMemo = new string(' ', 100);

            string a = "2011080001";
            string b="991";
            string c = "380000001:13871061222:10:000000";

            if (SysComm.Enabled)
            {
                IntPtr k = SysComm.Quest_goods(a, b, 0, "", 1, c, ref strPwd, ref strMemo);
                IntPtr aa = k;
            }