96 lines
4.4 KiB
VB.net
96 lines
4.4 KiB
VB.net
#Region "Microsoft.VisualBasic::a810b6c4ba107323a3ec2d0a908a1d7c, Microsoft.VisualBasic.Core\Extensions\Reflection\Marshal\MarshalExtensions.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module MarshalExtensions
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'
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' Function: (+2 Overloads) MarshalAs
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Imports Microsoft.VisualBasic.Emit.Marshal
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''' <summary>
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'''
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''' </summary>
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Public Module MarshalExtensions
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''' <summary>
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''' Read unmanaged memory using memory pointer.
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''' </summary>
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''' <typeparam name="T">
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''' <see cref="Integer"/>, <see cref="Char"/>, <see cref="Short"/>, <see cref="Long"/>, <see cref="Single"/>, <see cref="Byte"/>, <see cref="IntPtr"/>, <see cref="Double"/>
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''' </typeparam>
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''' <param name="p"></param>
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''' <returns></returns>
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''' <remarks>
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''' ```vbnet
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''' Public Shared Sub Copy(source As IntPtr, destination() As Integer, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Char, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Short, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Long, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Single, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Byte, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As IntPtr, startIndex As Integer, length As Integer)
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''' Public Shared Sub Copy(source As IntPtr, destination() As Double, startIndex As Integer, length As Integer)
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''' ```
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''' </remarks>
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<Extension> Public Function MarshalAs(Of T)(p As System.IntPtr, chunkSize As Integer) As IntPtr(Of T)
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Select Case GetType(T)
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Case GetType(Integer) : Return DirectCast(CType(New [Integer](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Char) : Return DirectCast(CType(New [Char](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Short) : Return DirectCast(CType(New [Short](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Long) : Return DirectCast(CType(New [Long](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Single) : Return DirectCast(CType(New [Single](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Byte) : Return DirectCast(CType(New [Byte](p, chunkSize), Object), IntPtr(Of T))
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Case GetType(System.IntPtr) : Return DirectCast(CType(New IntPtr(p, chunkSize), Object), IntPtr(Of T))
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Case GetType(Double) : Return DirectCast(CType(New [Double](p, chunkSize), Object), IntPtr(Of T))
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Case Else
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Throw New MemberAccessException(GetType(T).FullName & " is not a valid memory region!")
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End Select
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End Function
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''' <summary>
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''' 方便进行数组操作的一个函数
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''' </summary>
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''' <typeparam name="T"></typeparam>
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''' <param name="raw"></param>
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''' <param name="p"></param>
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''' <returns></returns>
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<Extension> Public Function MarshalAs(Of T)(ByRef raw As T(), Optional p As System.IntPtr = Nothing) As IntPtr(Of T)
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Return New IntPtr(Of T)(raw, p)
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End Function
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End Module
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