一段精簡的使用ADODB.Stream讀寫"大字段"的VB代碼!

領測軟件測試網 '一段精簡的讀寫"大字段"的代碼,使用 ADODB.Stream
'Objects: Form1、Picture1
'引用 Microsoft ActiveX Data Objects 2.5 Libary
'或 Microsoft ActiveX Data Objects 2.6 Libary
Dim TempFileName As String
TempFileName = App.Path & "\TempFile.tmp"
Dim adoConnection As New ADODB.Connection
Dim adoRecordset As New ADODB.Recordset
adoConnection.Open "Provider=Microsoft.Jet.OLEDB.3.51;Persist Security Info=False;Data Source=" & App.Path & "\mmxdb97.mdb"
adoRecordset.Open "SELECT * FROM bmp", adoConnection, adOpenKeyset, adLockOptimistic ', adCmdTable
Debug.Print adoRecordset.Fields(1).Type '大字段
adoRecordset.AddNew
Dim adoStream As New ADODB.Stream
adoStream.Type = adTypeBinary
adoStream.Open
adoStream.LoadFromFile CommonDialog1.FileName
'將二進制文件寫入大字段:
adoRecordset.Fields.Item(1).AppendChunk adoStream.Read
'================================
'從大字段讀取二進制數據:
adoStream.Write adoRecordset.Fields.Item(1).GetChunk(adoRecordset.Fields.Item(1).ActualSize)
adoStream.SaveToFile TempFileName, IIf(Len(Trim(Dir(TempFileName, vbNormal + vbHidden))) > 0, adSaveCreateOverWrite, adSaveCreateNotExist)
Picture1.AutoSize = True
Picture1.Picture = LoadPicture(TempFileName)

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