c# - 在 Windows CE 的 Struct 中编码字符数组

Question

如何在以下结构定义中编码字符数组？在 .Net CompactFramework 中(适用于 Windows CE)

//交易请求结构

typedef struct _VXN_REQUEST
{

    char        DID [33]; 
    char        MID [33]; 
    char        TID [33];  
    char        ClientRef [33]; 
    char        Payload [8192];
    ULONG       PayloadLength;
} VXN_REQUEST, *LPVXN_REQUEST;

我试过像这样编码它，但它似乎不起作用

        [StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
        public struct VXN_REQUEST
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
            public string DID;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
            public string MID;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
            public string TID;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
            public string ClientRef;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 33)]
            public string Payload;
            public uint PayloadLength;

        }

也试过这样，但没有一个有效， native 代码将其作为单个字符。

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct VXN_REQUEST
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 33)]

    public char[] DID;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 33)]

    public char[] MID;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 33)]

    public char[] TID;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 33)]

    public char[] ClientRef;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 33)]

    public char[] Payload;
    public uint PayloadLength;
}

Answer 1

.NET char 占用两个字节，它存储以 utf-16 编码的 Unicode 代码点。在声明中使用 byte 而不是 char。如果您确实需要这些字段为字符串，请使用 Encoding.ASCII.GetBytes() 来填充 byte[]。