Question

i am using a COM dll in my C# Project. I have one USERINFO Structure in my COM dll which looks like :

struct USERINFO
{
        BYTE UserID[USER_ID_SIZE];//42
        BYTE FirstName[NAME_SIZE];//66
        BYTE LastName[NAME_SIZE]; //66
        long Pin;
        BYTE TimeGroupIDList[IDLIST_SIZE];//10
        enum EUserKind   eUserKind;
        BYTE WarningEye;        
};

当我在C# Application中利用这一结构来填补用户数据的这一结构并转至我的AddUser API时,它就把这一错误归来。

Any help is appreciated. Thanks.

Answer 1

C#不支持结构内(不安全情况下除外)的固定宽度阵列,因此您的C级结构很可能被归入C#结构,如:

struct USERINFO
{
    MarshalAs(UnmanagedType.ByValArray, SizeConst = 42)
    BYTE[] UserID;
    MarshalAs(UnmanagedType.ByValArray, SizeConst = 66)
    BYTE[] FirstName;
    // etc.
};

请注意,成员是指阵列,而不是阵列。

For the marshalling to work the arrays have to be exactly the right length (or maybe at least the right length, I forget). For example, UserID should be initialised with userInfo.UserID = new byte[42];

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