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[DllImport("ICcard_dll.dll",CharSet=CharSet.Ansi)]
public static extern int Init_com(char* set);

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            [DllImport("ICcard_dll.dll",CharSet=CharSet.Ansi)]
            public static extern int Init_com(string set);
            string StrConnect="1,9600,N,8,4";
            iret = Init_com(StrConnect);

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            [DllImport("ICcard_dll.dll",CharSet=CharSet.Ansi)]
            public static extern int Init_com(ref char set);
            string StrConnect="1,9600,N,8,4";
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public static extern int Init_com(string set);

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public static extern int Init_com(string set);

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