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#Region "Microsoft.VisualBasic::d0734ca516af4aa5879f9cebd251761f, Microsoft.VisualBasic.Core\ApplicationServices\Tools\Win32\Win32File.vb"
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#End Region
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Imports System.Collections.Generic
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Imports System.Text
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Imports Microsoft.Win32.SafeHandles
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Imports System.Runtime.InteropServices
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Imports System.Runtime.InteropServices.Marshal
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Imports System.IO
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Namespace Win32
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Public Module Win32File
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Const ERROR_ALREADY_EXISTS As Integer = 183
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Const FILE_BEGIN As UInteger = &H0
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Const FILE_CURRENT As UInteger = &H1
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Const FILE_END As UInteger = &H2
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Const GENERIC_READ As UInteger = &H80000000UI
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Const GENERIC_WRITE As UInteger = &H40000000
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Const GENERIC_EXECUTE As UInteger = &H20000000
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Const GENERIC_ALL As UInteger = &H10000000
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Const FILE_APPEND_DATA As UInteger = &H4
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Const FILE_ATTRIBUTE_NORMAL As UInteger = &H80
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Const FILE_SHARE_DELETE As UInteger = &H4
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Const FILE_SHARE_READ As UInteger = &H1
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Const FILE_SHARE_WRITE As UInteger = &H2
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Const CREATE_NEW As UInteger = 1
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Const CREATE_ALWAYS As UInteger = 2
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Const OPEN_EXISTING As UInteger = 3
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Const OPEN_ALWAYS As UInteger = 4
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Const TRUNCATE_EXISTING As UInteger = 5
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<DllImport("kernel32.dll", SetLastError:=True, CharSet:=CharSet.Unicode)>
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Private Function CreateFileW(lpFileName As String, dwDesiredAccess As UInteger, dwShareMode As UInteger, lpSecurityAttributes As IntPtr, dwCreationDisposition As UInteger, dwFlagsAndAttributes As UInteger, hTemplateFile As IntPtr) As SafeFileHandle
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End Function
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<DllImport("kernel32.dll", SetLastError:=True, CharSet:=CharSet.Unicode)>
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Private Function SetFilePointer(hFile As SafeFileHandle, lDistanceToMove As Long, lpDistanceToMoveHigh As IntPtr, dwMoveMethod As UInteger) As UInteger
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End Function
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#Region "GetMode"
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Private Function GetMode(mode As FileMode) As UInteger
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Dim umode As UInteger = 0
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Select Case mode
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Case FileMode.CreateNew
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umode = CREATE_NEW
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Case FileMode.Create
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umode = CREATE_ALWAYS
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Case FileMode.Append
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umode = OPEN_ALWAYS
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Case FileMode.Open
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umode = OPEN_EXISTING
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Case FileMode.OpenOrCreate
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umode = OPEN_ALWAYS
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Case FileMode.Truncate
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umode = TRUNCATE_EXISTING
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End Select
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Return umode
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End Function
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#End Region
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Public Function ReadAllText(path As String, encoding As System.Text.Encoding) As String
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On Error Resume Next
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Dim FileStream = Win32File.OpenRead(path)
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Dim ChunkBuffer As Byte() = New Byte(FileStream.Length - 1) {}
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Call FileStream.Read(ChunkBuffer, 0, ChunkBuffer.Length)
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Return encoding.GetString(ChunkBuffer)
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End Function
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#Region "GetAccess"
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Private Function GetAccess(access As FileAccess) As UInteger
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Dim uaccess As UInteger = 0
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Select Case access
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Case FileAccess.Read
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uaccess = GENERIC_READ
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Case FileAccess.ReadWrite
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uaccess = GENERIC_READ Or GENERIC_WRITE
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Case FileAccess.Write
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uaccess = GENERIC_WRITE
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End Select
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Return uaccess
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End Function
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#End Region
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#Region "GetShare"
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</remarks>
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Private Function GetShare(share As FileShare) As UInteger
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Dim ushare As UInteger = 0
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Select Case share
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Case FileShare.Read
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ushare = FILE_SHARE_READ
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Case FileShare.ReadWrite
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ushare = FILE_SHARE_READ Or FILE_SHARE_WRITE
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Case FileShare.Write
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ushare = FILE_SHARE_WRITE
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Case FileShare.Delete
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ushare = FILE_SHARE_DELETE
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Case FileShare.None
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ushare = 0
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End Select
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Return ushare
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End Function
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#End Region
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Const ushare As UInteger = 0
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Public Function Open(filepath As String, mode As FileMode) As FileStream
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Dim fs As FileStream = Nothing
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Dim umode As UInteger = GetMode(mode)
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Dim uaccess As UInteger = GENERIC_READ Or GENERIC_WRITE
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If mode = FileMode.Append Then
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uaccess = FILE_APPEND_DATA
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End If
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If filepath.StartsWith("\\") Then
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filepath = "\\?\UNC\" & filepath.Substring(2, filepath.Length - 2)
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Else
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filepath = "\\?\" & filepath
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End If
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Dim sh As SafeFileHandle = CreateFileW(filepath, uaccess, ushare, IntPtr.Zero, umode, FILE_ATTRIBUTE_NORMAL,
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IntPtr.Zero)
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Dim iError As Integer = GetLastWin32Error()
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If (iError > 0 AndAlso Not (mode = FileMode.Append AndAlso iError = ERROR_ALREADY_EXISTS)) OrElse sh.IsInvalid Then
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Throw New Exception("Error opening file Win32 Error:" & iError)
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Else
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fs = New FileStream(sh, FileAccess.ReadWrite)
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End If
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If mode = FileMode.Append Then
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If Not sh.IsInvalid Then
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SetFilePointer(sh, 0, IntPtr.Zero, FILE_END)
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End If
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End If
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Return fs
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End Function
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Public Function Open(filepath As String, mode As FileMode, access As FileAccess) As FileStream
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Dim fs As FileStream = Nothing
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Dim umode As UInteger = GetMode(mode)
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Dim uaccess As UInteger = GetAccess(access)
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If mode = FileMode.Append Then
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uaccess = FILE_APPEND_DATA
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End If
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If filepath.StartsWith("\\") Then
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filepath = "\\?\UNC\" & filepath.Substring(2, filepath.Length - 2)
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Else
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filepath = "\\?\" & filepath
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End If
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Dim sh As SafeFileHandle = CreateFileW(filepath, uaccess, ushare, IntPtr.Zero, umode, FILE_ATTRIBUTE_NORMAL,
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IntPtr.Zero)
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Dim iError As Integer = GetLastWin32Error()
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If (iError > 0 AndAlso Not (mode = FileMode.Append AndAlso iError <> ERROR_ALREADY_EXISTS)) OrElse sh.IsInvalid Then
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Throw New Exception("Error opening file Win32 Error:" & iError)
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Else
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fs = New FileStream(sh, access)
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End If
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If mode = FileMode.Append Then
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If Not sh.IsInvalid Then
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SetFilePointer(sh, 0, IntPtr.Zero, FILE_END)
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End If
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End If
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Return fs
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End Function
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Public Function Open(filepath As String, mode As FileMode, access As FileAccess, share As FileShare) As FileStream
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Dim fs As FileStream = Nothing
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Dim umode As UInteger = GetMode(mode)
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Dim uaccess As UInteger = GetAccess(access)
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Dim ushare As UInteger = GetShare(share)
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If mode = FileMode.Append Then
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uaccess = FILE_APPEND_DATA
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End If
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If filepath.StartsWith("\\") Then
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filepath = "\\?\UNC\" & filepath.Substring(2, filepath.Length - 2)
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Else
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filepath = "\\?\" & filepath
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End If
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Dim sh As SafeFileHandle = CreateFileW(filepath, uaccess, ushare, IntPtr.Zero, umode, FILE_ATTRIBUTE_NORMAL,
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IntPtr.Zero)
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Dim iError As Integer = GetLastWin32Error()
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If (iError > 0 AndAlso Not (mode = FileMode.Append AndAlso iError <> ERROR_ALREADY_EXISTS)) OrElse sh.IsInvalid Then
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Throw New Exception("Error opening file Win32 Error:" & iError)
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Else
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fs = New FileStream(sh, access)
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End If
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If mode = FileMode.Append Then
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If Not sh.IsInvalid Then
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SetFilePointer(sh, 0, IntPtr.Zero, FILE_END)
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End If
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End If
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Return fs
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End Function
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</remarks>
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Public Function OpenRead(filepath As String) As FileStream
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Return Open(filepath, FileMode.OpenOrCreate, FileAccess.Read, FileShare.Read)
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End Function
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</remarks>
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Public Function OpenWrite(filepath As String) As FileStream
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Return Open(filepath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.None)
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End Function
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End Module
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End Namespace
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