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  • [C#]I/O完成端口的实现

    VC++中我几乎每一个Windows Service都是采用I/O完成端口。至于在C#中如何使用I/O完成端口,一直很少见人提及。 William Kennedy的三篇文章《IOCP Thread Pooling in C#》,对实现这种机制很有帮助,唯一美中不足的是,它只能把int数值压入完成端口,而无法像VC++中那样可以将接口指针/BSTR字符串等等转为OVERLAPPED*。我试了很多遍Marshal.PtrToStructure/StructureToPtr 和StringToBSTR,总是无法成功通过I/O完成端口传递string。

    我还曾经用以下这2个函数将string转换为byte[],然后将byte[]转换为NativeOverlapped。总是不行。

    System.Threading.NativeOverlapped Ov = new NativeOverlapped();
    byte[] btRaw = Str2Arr(strValue);
    Ov = (System.Threading.NativeOverlapped)
    RawDeserialize(btRaw, typeof(System.Threading.NativeOverlapped));

    函数声明如下:
    public static byte[] Str2Arr(String s)
    {
    return (new UnicodeEncoding()).GetBytes(s);
    }
    public static string Arr2Str(byte[] buffer)
    {
    return (new UnicodeEncoding()).GetString(buffer, 0, buffer.Length);
    }
    public static byte[] RawSerialize( object anything )
    {
    int rawsize = Marshal.SizeOf( anything );
    IntPtr buffer = Marshal.AllocHGlobal( rawsize );
    Marshal.StructureToPtr( anything, buffer, false );
    byte[] rawdatas = new byte[ rawsize ];
    Marshal.Copy( buffer, rawdatas, 0, rawsize );
    Marshal.FreeHGlobal( buffer );
    return rawdatas;
    }

    public static object RawDeserialize( byte[] rawdatas, Type anytype )
    {
    int rawsize = Marshal.SizeOf( anytype );
    if( rawsize > rawdatas.Length )
    return null;
    IntPtr buffer = Marshal.AllocHGlobal( rawsize );
    Marshal.Copy( rawdatas, 0, buffer, rawsize );
    object retobj = Marshal.PtrToStructure( buffer, anytype );
    Marshal.FreeHGlobal( buffer );
    return retobj;
    }

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  • 原文地址:https://www.cnblogs.com/zhengyun_ustc/p/135827.html
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