ACC: Reading, Storing, & Writing Binary Large Objects (BLOBs)
ID: Q103257
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The information in this article applies to:
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Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97
SUMMARY
Advanced: Requires expert coding, interoperability, and multiuser skills.
You can store large data objects (such as sound, video, or graphic data) in
a field with the OLE Object data type in a Microsoft Access table. Some
large binary data objects cannot be represented, however, if they do not
have an OLE server that understands the data being stored. You can also
store copies of executable program files or other non-OLE data in a
Microsoft Access table. This type of data is referred to as a binary large
object bitmap (BLOB).
This article assumes that you are familiar with Visual Basic for
Applications and with creating Microsoft Access applications using the
programming tools provided with Microsoft Access. For more information
about Visual Basic for Applications, please refer to your version of the
"Building Applications with Microsoft Access" manual.
NOTE: Visual Basic for Applications is called Access Basic in Microsoft
Access versions 1.x and 2.0. For more information about Access Basic,
please refer to the "Introduction to Programming" manual in Microsoft
Access version 1.x or the "Building Applications" manual in Microsoft
Access version 2.0.
MORE INFORMATION
The following example contains two sample user-defined functions that you
can use to manage large amounts of binary data in a field with the OLE
Object data type. The user-defined functions are ReadBLOB() and
WriteBLOB().
- The ReadBLOB() function reads a binary disk file and stores
it in an OLE Object field.
- The WriteBLOB() function writes binary data stored in an OLE Object
field to a disk file.
This example demonstrates how to copy a binary file into an OLE Object
field, and then how to write it back out to a new disk file:
- Create a new module called BLOB and enter the following lines in the
module's Declarations section:
Option Explicit
Const BlockSize = 32768
NOTE: If you are working with Microsoft Access 2.0, you will need to
include the following definitions after the two previous ones:
Const dbOpenTable = DB_OPEN_TABLE
Const acSysCmdInitMeter = SYSCMD_INITMETER
Const acSysCmdUpdateMeter = SYSCMD_UPDATEMETER
Const acSysCmdRemoveMeter = SYSCMD_REMOVEMETER
- Enter the following code in the module.
NOTE: In the following sample code, an underscore (_) at the end of a
line is used as a line-continuation character. Remove the underscore
from the end of the line when re-creating this code in Access Basic.
NOTE: The following technique will not work for Microsoft Access 1.x.
For Microsoft Access 1.x, you will need to modify the code so that it
uses Table variables instead of Recordset variables and the OpenTable
function instead of OpenRecordset.
'**************************************************************
' FUNCTION: ReadBLOB()
'
' PURPOSE:
' Reads a BLOB from a disk file and stores the contents in the
' specified table and field.
'
' PREREQUISITES:
' The specified table with the OLE object field to contain the
' binary data must be opened in Visual Basic code (Access Basic
' code in Microsoft Access 2.0 and earlier) and the correct record
' navigated to prior to calling the ReadBLOB() function.
'
' ARGUMENTS:
' Source - The path and filename of the binary information
' to be read and stored.
' T - The table object to store the data in.
' Field - The OLE object field in table T to store the data in.
'
' RETURN:
' The number of bytes read from the Source file.
'**************************************************************
Function ReadBLOB(Source As String, T As Recordset, _
sField As String)
Dim NumBlocks As Integer, SourceFile As Integer, i As Integer
Dim FileLength As Long, LeftOver As Long
Dim FileData As String
Dim RetVal As Variant
On Error GoTo Err_ReadBLOB
' Open the source file.
SourceFile = FreeFile
Open Source For Binary Access Read As SourceFile
' Get the length of the file.
FileLength = LOF(SourceFile)
If FileLength = 0 Then
ReadBLOB = 0
Exit Function
End If
' Calculate the number of blocks to read and leftover bytes.
NumBlocks = FileLength \ BlockSize
LeftOver = FileLength Mod BlockSize
' SysCmd is used to manipulate status bar meter.
RetVal = SysCmd(acSysCmdInitMeter, "Reading BLOB", _
FileLength \ 1000)
' Put first record in edit mode.
T.MoveFirst
T.Edit
' Read the leftover data, writing it to the table.
FileData = String$(LeftOver, 32)
Get SourceFile, , FileData
T(sField).AppendChunk (FileData)
RetVal = SysCmd(acSysCmdUpdateMeter, LeftOver / 1000)
' Read the remaining blocks of data, writing them to the table.
FileData = String$(BlockSize, 32)
For i = 1 To NumBlocks
Get SourceFile, , FileData
T(sField).AppendChunk (FileData)
RetVal = SysCmd(acSysCmdUpdateMeter, BlockSize * i / 1000)
Next i
' Update the record and terminate function.
T.Update
RetVal = SysCmd(acSysCmdRemoveMeter)
Close SourceFile
ReadBLOB = FileLength
Exit Function
Err_ReadBLOB:
ReadBLOB = -Err
Exit Function
End Function
'**************************************************************
' FUNCTION: WriteBLOB()
'
' PURPOSE:
' Writes BLOB information stored in the specified table and field
' to the specified disk file.
'
' PREREQUISITES:
' The specified table with the OLE object field containing the
' binary data must be opened in Visual Basic code (Access Basic
' code in Microsoft Access 2.0 or earlier) and the correct
' record navigated to prior to calling the WriteBLOB() function.
'
' ARGUMENTS:
' T - The table object containing the binary information.
' sField - The OLE object field in table T containing the
' binary information to write.
' Destination - The path and filename to write the binary
' information to.
'
' RETURN:
' The number of bytes written to the destination file.
'**************************************************************
Function WriteBLOB(T As Recordset, sField As String, _
Destination As String)
Dim NumBlocks As Integer, DestFile As Integer, i As Integer
Dim FileLength As Long, LeftOver As Long
Dim FileData As String
Dim RetVal As Variant
On Error GoTo Err_WriteBLOB
' Get the size of the field.
FileLength = T(sField).FieldSize()
If FileLength = 0 Then
WriteBLOB = 0
Exit Function
End If
' Calculate number of blocks to write and leftover bytes.
NumBlocks = FileLength \ BlockSize
LeftOver = FileLength Mod BlockSize
' Remove any existing destination file.
DestFile = FreeFile
Open Destination For Output As DestFile
Close DestFile
' Open the destination file.
Open Destination For Binary As DestFile
' SysCmd is used to manipulate the status bar meter.
RetVal = SysCmd(acSysCmdInitMeter, _
"Writing BLOB", FileLength / 1000)
' Write the leftover data to the output file.
FileData = T(sField).GetChunk(0, LeftOver)
Put DestFile, , FileData
' Update the status bar meter.
RetVal = SysCmd(acSysCmdUpdateMeter, LeftOver / 1000)
' Write the remaining blocks of data to the output file.
For i = 1 To NumBlocks
' Reads a chunk and writes it to output file.
FileData = T(sField).GetChunk((i - 1) * BlockSize _
+ LeftOver, BlockSize)
Put DestFile, , FileData
RetVal = SysCmd(acSysCmdUpdateMeter, _
((i - 1) * BlockSize + LeftOver) / 1000)
Next i
' Terminates function
RetVal = SysCmd(acSysCmdRemoveMeter)
Close DestFile
WriteBLOB = FileLength
Exit Function
Err_WriteBLOB:
WriteBLOB = -Err
Exit Function
End Function
'**************************************************************
' SUB: CopyFile
'
' PURPOSE:
' Demonstrates how to use ReadBLOB() and WriteBLOB().
'
' PREREQUISITES:
' A table called BLOB that contains an OLE Object field called
' Blob.
'
' ARGUMENTS:
' Source - The path and filename of the information to copy.
' Destination - The path and filename of the file to write
' the binary information to.
'
' EXAMPLE:
' CopyFile "c:\windows\winfile.hlp", "c:\windows\winfil_1.hlp"
'**************************************************************
Sub CopyFile(Source As String, Destination As String)
Dim BytesRead As Variant, BytesWritten As Variant
Dim Msg As String
Dim db As Database
Dim T As Recordset
' Open the BLOB table.
Set db = CurrentDb()
Set T = db.OpenRecordset("BLOB", dbOpenTable)
' Create a new record and move to it.
T.AddNew
T.Update
T.MoveLast
BytesRead = ReadBLOB(Source, T, "Blob")
Msg = "Finished reading """ & Source & """"
Msg = Msg & Chr$(13) & ".. " & BytesRead & " bytes read."
MsgBox Msg, 64, "Copy File"
BytesWritten = WriteBLOB(T, "Blob", Destination)
Msg = "Finished writing """ & Destination & """"
Msg = Msg & Chr$(13) & ".. " & BytesWritten & " bytes written."
MsgBox Msg, 64, "Copy File"
End Sub
- Create the following new table, and then save it as BLOB:
Table: BLOB
------------------------
Field Name: Blob
Data Type: OLE Object
- With the BLOB module open in Design view, click Debug Window (or
Immediate Window in Microsoft Access 2.0 or earlier) on the
View menu.
- Type the following line in the Debug window, and then press ENTER:
CopyFile "c:\windows\winfile.hlp", "c:\windows\winfil_1.hlp"
The ReadBLOB() and WriteBLOB() functions copy the Microsoft Windows Help
file to the Blob field in the BLOB table, and then from there to a disk
file called Winfil_1.hlp
Additional query words:
Keywords : kbprg IntpOle
Version : WINDOWS:1.0,1.1,2.0,7.0,97
Platform : WINDOWS
Issue type : kbinfo
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