Question

我正在为WIN-CE平台开发C＃.Net CF.在我的代码中我正在使用

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：

     [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“不支持异常”。这两种方法都抛出异常。

任何人都可以告诉我如何找到结构大小以及如何将结构转换为Ptr而没有任何WIN-CE问题。

谢谢！

Answer 1

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

最重要的是，我必须承认对你使用char[]的方式持怀疑态度。我会用UnmanagedType.LPWStr作为字符串。

所以我会像你这样的结构：

[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; 
};

我不确定为什么Marshal.SizeOf失败了。您可能需要将ptcDeviceName声明为IntPtr并使用Marshal.StringToHGlobalUni来设置值。这至少会使结构变得模糊，如果Marshal.SizeOf仍然失败，那么你可以回到sizeof。

Marshal.SizeOf（）＆amp; Marshal.StructureToPtr（）在.NET CF WIN-CE中抛出异常

1 个答案: