OUVRIR N'IMPORTE QUEL FICHIER AVEC READFILE (API)

'API Fichiers
Const MOVEFILE_REPLACE_EXISTING = &H1
Const FILE_ATTRIBUTE_TEMPORARY = &H100
Const FILE_BEGIN = 0
Const FILE_SHARE_READ = &H1
Const FILE_SHARE_WRITE = &H2
Const CREATE_NEW = 1
Const OPEN_EXISTING = 3
Const GENERIC_READ = &H80000000
Const GENERIC_WRITE = &H40000000

Private Declare Function ReadFile Lib "kernel32" (ByVal hFile As Long, lpBuffer As Any, ByVal nNumberOfBytesToRead As Long, lpNumberOfBytesRead As Long, ByVal lpOverlapped As Any) As Long

Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Any, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long

Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Declare Function SetFilePointer Lib "kernel32" (ByVal hFile As Long, ByVal lDistanceToMove As Long, lpDistanceToMoveHigh As Long, ByVal dwMoveMethod As Long) As Long

Private Declare Function GetFileSize Lib "kernel32" (ByVal hFile As Long, lpFileSizeHigh As Long) As Long



'#############################################
'#                                                                                                  #
'# Retourne le contenu du fichier "FileName"  sous forme d'une String #
'#                                                                                                  #
'#############################################

'FileName est le chemin absolue du fichier (par exemple : "c:\toto.doc")
Public Function OpenFile(ByRef FileName As String) As String
    Dim hOrgFile As Long
    Dim nSize As Long
    Dim Ret As Long
    Dim i As Long
    
    On Error GoTo ErrorHandler
    
    hOrgFile = CreateFile(FileName, _
                            GENERIC_READ, _
                            FILE_SHARE_READ Or FILE_SHARE_WRITE, _
                            ByVal 0&, OPEN_EXISTING, 0, 0)

    'Taille du fichier
    nSize = GetFileSize(hOrgFile, 0)

    'Initialise le pointeur sur le fichier
    SetFilePointer hOrgFile, 0, 0, FILE_BEGIN
    
    OpenFile = Space(nSize)
    
    'Charge le contenu du fichier dans la variable Openfile
    ReadFile hOrgFile, ByVal OpenFile, nSize, Ret, ByVal 0&
     
    'Ferme le fichier
    CloseHandle hOrgFile
    
    Exit Function
ErrorHandler:
    MsgBox "Impossible de lire le fichier "+FileName ,vbExclamation

End Function