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90 lines
3.2 KiB
C#
90 lines
3.2 KiB
C#
//
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// MemStructs.cs
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//
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// Author:
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// Carsten Sonne Larsen <cs@innolan.dk>
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//
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// Copyright (c) 2013-2016 Carsten Sonne Larsen
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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namespace Ntp.Monitor
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{
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/*
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[StructLayout(LayoutKind.Explicit)]
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public struct struct1
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{
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[FieldOffset(0)]
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public byte a; // 1 byte
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[FieldOffset(1)]
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public int b; // 4 bytes
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[FieldOffset(5)]
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public short c; // 2 bytes
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[FieldOffset(7)]
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public byte buffer;
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[FieldOffset(18)]
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public byte d; // 1 byte
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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public struct DISPLAY_DEVICE
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{
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public int cb;
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public fixed char DeviceName[32];
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public fixed char DeviceString[128];
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public int StateFlags;
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public fixed char DeviceID[128];
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public fixed char DeviceKey[128];
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}
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The third and final method is to use custom marshalling. Many C# programmers don’t realise that marshalling
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isn’t just about the way that the system types data for passing to DLLs – instead it is an active process
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that copies and transforms the managed data. For example, if you choose to pass a reference to an array of
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typed elements then you can ask for it to be marshalled as a value array and the system will convert it into
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a fixed length buffer, and back to a managed array, without any extra effort on your part.
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In this case all we have to do is add the MarshalAs attribute, specify the type and size of the arrays:
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[StructLayout(LayoutKind.Sequential,
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Pack = 1, CharSet = CharSet.Unicode)]
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public struct DISPLAY_DEVICE
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{
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public int cb;
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[MarshalAs(
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UnmanagedType.ByValArray,
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SizeConst=32)]
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public char[] DeviceName;
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[MarshalAs(
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UnmanagedType.ByValArray,
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SizeConst=128)]
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public char[] DeviceString;
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public int StateFlags;
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[MarshalAs(
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UnmanagedType.ByValArray,
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SizeConst = 128)]
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public char[] DeviceID;
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[MarshalAs(
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UnmanagedType.ByValArray,
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SizeConst = 128)]
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public char[] DeviceKey;
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}
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*/
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} |