98 lines
3.6 KiB
OpenEdge ABL
98 lines
3.6 KiB
OpenEdge ABL
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VERSION 1.0 CLASS
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BEGIN
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MultiUse = -1 'True
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Persistable = 0 'NotPersistable
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DataBindingBehavior = 0 'vbNone
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DataSourceBehavior = 0 'vbNone
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MTSTransactionMode = 0 'NotAnMTSObject
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END
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Attribute VB_Name = "clsFileIo"
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Attribute VB_GlobalNameSpace = False
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Attribute VB_Creatable = True
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Attribute VB_PredeclaredId = False
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Attribute VB_Exposed = False
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' This ClassModule is written by Peter Hebels
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Option Explicit
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Private Const GENERIC_WRITE = &H40000000
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Private Const FILE_ATTRIBUTE_NORMAL = &H80
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Private Const CREATE_ALWAYS = 2
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Private Const OPEN_ALWAYS = 4
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Private Const INVALID_HANDLE_VALUE = -1
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Private Declare Function MessageBox Lib "user32" Alias "MessageBoxA" (ByVal hwnd As Long, ByVal lpText As String, ByVal lpCaption As String, ByVal wType As Long) As Long
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Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Long) As Long
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Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
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Private Declare Function WriteFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToWrite As Long, lpNumberOfBytesWritten As Long, ByVal lpOverlapped As Long) As Long
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Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
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Private Declare Function FlushFileBuffers Lib "kernel32" (ByVal hFile As Long) As Long
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Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal length As Long)
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Private fHandle As Long
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Private fSuccess As Long
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Private lFilePos As Long
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Private File_Name As String
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Public Function OpenFile(FileN As String) As Boolean
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fHandle = CreateFile(FileN, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0)
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If fHandle <> INVALID_HANDLE_VALUE Then
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File_Name = FileN
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OpenFile = True
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Else
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OpenFile = False
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End If
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End Function
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Public Function CloseFile() As Boolean
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If fHandle <> INVALID_HANDLE_VALUE And File_Name <> "" Then
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fSuccess = CloseHandle(fHandle)
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CloseFile = True
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Else
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CloseFile = False
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End If
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End Function
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Public Function WriteBytes(Pointer As Long, Size As Long) As Boolean
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Dim hHdr As String
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Dim NewHeader As String
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Dim i As Long
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Dim d() As Byte
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ReDim d(Size) As Byte
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If fHandle <> INVALID_HANDLE_VALUE And File_Name <> "" Then
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hHdr = Chr(255) & Chr(251)
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If GotHeader = False Then
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Call CopyMemory(d(0), ByVal Pointer, Size)
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For i = 1 To Size
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If d(i) = 255 Then
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If d(i + 1) = 251 Then
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NewHeader = hHdr & Chr(d(i + 2))
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fSuccess = WriteFile(fHandle, ByVal NewHeader, LenB(NewHeader), lFilePos, 0)
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If fSuccess <> 0 Then
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fSuccess = FlushFileBuffers(fHandle)
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GotHeader = True
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Exit For
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End If
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End If
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End If
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Next i
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End If
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If GotHeader = True Then
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fSuccess = WriteFile(fHandle, ByVal Pointer, Size, lFilePos, 0)
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If fSuccess <> 0 Then
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fSuccess = FlushFileBuffers(fHandle)
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WriteBytes = True
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Else
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WriteBytes = False
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Exit Function
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End If
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End If
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Else
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WriteBytes = False
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Exit Function
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End If
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End Function
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