Marshal.SizeOf() &Marshal.StructureToPtr() 在 .NET CF WIN-CE 中抛出异常 [英] Marshal.SizeOf() & Marshal.StructureToPtr() Throwing Exceptions in .NET CF WIN-CE

问题描述

我正在为 WIN-CE 平台开发 C#.Net CF.在我的代码中，我使用

I am working on C#.Net CF for WIN-CE platform. In my code I am using

int size = Marshal.SizeOf(typeof(struct_Obj));

IntPtr newptr = Marshal.AllocHGlobal(size);

Marshal.StructureToPtr(struct_Obj, newptr, false);

我正在尝试发送此结构信息:

I am trying to send this struct info:

     [StructLayout(LayoutKind.Sequential,CharSet = CharSet.Unicode)]
public struct __NIC_STAT
{

    ulong Size;               //  Of this structure.

    public Char[] ptcDeviceName;      //  The device name to be queried.. 

    ulong DeviceState;        //  DEVICE_STATE_XXX above
    ulong DeviceState;        //  DEVICE_STATE_XXX above
    ulong MediaType;          //  NdisMediumXXX
    ulong MediaState;         //  MEDIA_STATE_XXX above
    ulong PhysicalMediaType;
    ulong LinkSpeed;          //  In 100bits/s. 10Mb/s = 100000
    UInt64 PacketsSent;
    UInt64 PacketsReceived;
    ulong InitTime;           //  In milliseconds
    ulong ConnectTime;        //  In seconds
    UInt64 BytesSent;          //  0 - Unknown (or not supported)
    UInt64 BytesReceived;      //  0 - Unknown (or not supported)
    UInt64 DirectedBytesReceived;
    UInt64 DirectedPacketsReceived;
    ulong PacketsReceiveErrors;
    ulong PacketsSendErrors;
    ulong ResetCount;
    ulong MediaSenseConnectCount;
    ulong MediaSenseDisconnectCount; 

} ;

当我在 WIN-CE 机器上运行代码时，我得到不支持的异常".这两种方法都在抛出异常.

when I run the code in WIN-CE machine, I am getting "not supported exception".Those two methods are throwing exceptions.

谁能告诉我如何找到结构大小以及如何将结构转换为 Ptr 而不会出现任何 WIN-CE 问题.

Can anybody tell me how to find the structure size and how to convert structure to Ptr with out any issues for WIN-CE.

谢谢！！

推荐答案

您的结构声明不正确.C++ ULONG 是 32 位无符号类型.但是在 C# 中，ulong 是 64 位.这显然是个大问题.

Your struct is declared incorrectly. The C++ ULONG is a 32 bit unsigned type. But in C#, ulong is 64 bits. That's clearly a huge problem.

最重要的是，我必须承认，对于以您的方式使用 char[] 有点怀疑.我会把它作为一个带有 UnmanagedType.LPWStr 的字符串来做.

On top of that, I must admit to being slightly sceptical about using char[] in the way you do. I would do it as a string with UnmanagedType.LPWStr.

所以我会让你的结构是这样的:

So I would have your struct like this:

[StructLayout(LayoutKind.Sequential,CharSet = CharSet.Unicode)]
public struct __NIC_STAT
{
    uint Size;   
    [MarshalAs(UnmanagedType.LPWStr)]        
    public string ptcDeviceName; 
    uint DeviceState;      
    uint DeviceState;      
    uint MediaType;        
    uint MediaState;       
    uint PhysicalMediaType;
    uint LinkSpeed;        
    ulong PacketsSent;
    ulong PacketsReceived;
    uint InitTime;      
    uint ConnectTime;   
    ulong BytesSent;    
    ulong BytesReceived; 
    ulong DirectedBytesReceived;
    ulong DirectedPacketsReceived;
    uint PacketsReceiveErrors;
    uint PacketsSendErrors;
    uint ResetCount;
    uint MediaSenseConnectCount;
    uint MediaSenseDisconnectCount; 
};

我不知道为什么 Marshal.SizeOf 对你来说失败了.您可能需要将 ptcDeviceName 声明为 IntPtr 并使用 Marshal.StringToHGlobalUni 来设置该值.这至少使结构 blittable，如果 Marshal.SizeOf 仍然失败，那么你可以依靠 sizeof.

I'm not sure why Marshal.SizeOf is failing for you. You may need to declare ptcDeviceName as IntPtr and use Marshal.StringToHGlobalUni to set the value. That at least makes the struct blittable and if Marshal.SizeOf still fails then you can fall back on sizeof.

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