by Connective Solutions LLC. (nofx) (3 Submissions)
Category: Databases/Data Access/DAO/ADO
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Wed 19th January 2000
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Stores any binary data into the Database field. ex: zip files, exe files, images etc. Retrieves the stored binary data from the database field.
VBcoders
Function CopyFieldToFile(rst As DAO.Recordset, fd As String, strFileName As String) As String
Dim FileNum As Integer
Dim Buffer() As Byte
Dim BytesNeeded As Long
Dim Buffers As Long
Dim Remainder As Long
Dim Offset As Long
Dim r As Integer
Dim i As Long
Dim ChunkSize As Long
ChunkSize = 65536
BytesNeeded = rst(fd).FieldSize
If BytesNeeded > 0 Then
' Calculate the number of buffers needed to copy
Buffers = BytesNeeded \ ChunkSize
Remainder = BytesNeeded Mod ChunkSize
' Get a unique, temporary filename:
If Dir(strFileName) <> "" Then
Kill strFileName
End If
' Copy the bitmap to the temporary file chunk by chunk:
FileNum = FreeFile
Open strFileName For Binary As #FileNum
For i = 0 To Buffers - 1
ReDim Buffer(ChunkSize)
Buffer = rst(fd).GetChunk(Offset, ChunkSize)
Put #FileNum, , Buffer()
Offset = Offset + ChunkSize
Next ' Copy the remaining chunk of the bitmap to the file:
ReDim Buffer(Remainder)
Buffer = rst(fd).GetChunk(Offset, Remainder)
Put #FileNum, , Buffer()
Close #FileNum
End If
CopyFieldToFile = strFileName
End Function
Function CopyFileToField(FileName As String, fd As DAO.Field)
Dim ChunkSize As Long
Dim FileNum As Integer
Dim Buffer() As Byte
Dim BytesNeeded As Long
Dim Buffers As Long
Dim Remainder As Long
Dim i As Long
If Len(FileName) = 0 Then
Exit Function
End If
If Dir(FileName) = "" Then
Err.Raise vbObjectError, , "File not found: """ & FileName & """"
End If
ChunkSize = 65536
FileNum = FreeFile
Open FileName For Binary As #FileNum
BytesNeeded = LOF(FileNum)
Buffers = BytesNeeded \ ChunkSize
Remainder = BytesNeeded Mod ChunkSize
For i = 0 To Buffers - 1
ReDim Buffer(ChunkSize)
Get #FileNum, , Buffer
fd.AppendChunk Buffer
Next
ReDim Buffer(Remainder)
Get #FileNum, , Buffer
fd.AppendChunk Buffer
Close #FileNum
End Function
'----------- Use of CopyFieldToFile ----------------
1. You must have a recordset open.
Call CopyFieldToFile <recordset>, "<Field>", "<Filename>"
'----------- Use of CopyFileToField ----------------
1. You must have a recordset open.
Call CopyFileToField "<Filename>", "<FieldToWriteTheFileTo>"
If you want the whole program to see how it really works with
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