C++ 函数中参数是结构体，C#如何传参
C++函数定义如下：

C/C++ code

Result_t hhpReadConfigItem( int cfgType, int item,PVOID pStruct ); typedef struct _tagHHP_VERSION_INFO {        DWORD   dwStructSize;        DWORD   dwMask;        TCHAR   tcAPIRev[ MAX_VERSION_STRING_LEN ];             // SDK API version string        TCHAR   tcFirmwareRev[ MAX_VERSION_STRING_LEN ];        // Imager firmware version } HHP_VERSION_INFO

C++中调用如下：

C/C++ code

HHP_VERSION_INFO version;version.dwStructSize = sizeof(HHP_VERSION_INFO);version.dwMask = SYM_MASK_ALL;//SYM_MASK_ALL = 0xffffffffnResult = hhpReadConfigItem(1, 4, &version);//返回正确

C#这样定义有错吗

C# code

Result_t hhpReadConfigItem(int cfgType, int item, IntPtr pStruct);

C# code

public struct HHP_VERSION_INFO        {            public uint dwMask;            public int dwStructSize;            public string strAPIRev;            public string strBootCodeRev;}

C#中要如何调用？
下面调用错在哪？

C# code

HHP_VERSION_INFO version = new HHP_VERSION_INFO();            version.dwStructSize = 1704;            version.dwMask = 4294967295;            IntPtr pStuct =new IntPtr();            pStuct = Marshal.AllocHGlobal(version.dwStructSize);            //Marshal.StructureToPtr(version, pStuct, true);            Result_t result = hhpReadConfigItem(1,4 , pStuct);//返回错误

[解决办法]
定义错了，最少也得加返回值的类型吧？
[解决办法]
你的结构体也要用Marshal规定长度和封装序列，参考

C# code

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 1)]    public struct APSYDDataItem    {        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]        private string _securityID;        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 5)]        private string _ydtype;    }