[C#]I/O完成連接埠的實現

在VC++中我幾乎每一個Windows Service都是採用I/O完成連接埠。至於在C#中如何使用I/O完成連接埠，一直很少見人提及。 William Kennedy的三篇文章《IOCP Thread Pooling in C#》，對實現這種機制很有協助，唯一美中不足的是，它只能把int數值壓入完成連接埠，而無法像VC++中那樣可以將介面指標/BSTR字串等等轉為OVERLAPPED*。我試了很多遍Marshal.PtrToStructure/StructureToPtr 和StringToBSTR,總是無法成功通過I/O完成連接埠傳遞string。

我還曾經用以下這2個函數將string轉換為byte[]，然後將byte[]轉換為NativeOverlapped。總是不行。

System.Threading.NativeOverlapped Ov = new NativeOverlapped();

byte[] btRaw = Str2Arr(strValue);

Ov = (System.Threading.NativeOverlapped)

RawDeserialize(btRaw, typeof(System.Threading.NativeOverlapped));

函式宣告如下：

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;

}