1. Taking the name and related picture as an example, the database is Access, there is the following field: name char, Picture Ole Object, FileLength
Number. When it is MS SQL, change the Picture to LOB.
2, the example contains Control: Commm Dialog, Picture, Listbox.
The source code is as follows:
Option expedition
Private Declare Function GetTempFileName LIB "kernel32" Alias "getTempFileName" (Byval Lpszpath As
String, Byval LpprefixString As String, ByVal Wunique Ashang, Byval LPTEMPFILENAME AS STRING AS LONG
Private Declare Function GetTemppath Lib "kernel32" Alias "getTemppatha" (Byval NBufferLength As Long,
BYVAL LPBUFFER AS STRING) AS Long
Private const Max_path = 260
Private m_dbconn as adoDb.connection
Private const block_size = 10000
Note: Return A Temporary File Name.
Private function temporaryfilename () AS String
DIM TEMP_PATH AS STRING
DIM TEMP_FILE AS STRING
DIM Length As Long
Note: Get The Temporary File Path.
Temp_path = space $ (MAX_PATH)
Length = getTemppath (max_path, temp_path)
TEMP_PATH = Left $ (Temp_Path, Length)
Note: Get the file name.
TEMP_FILE = Space $ (MAX_PATH)
GetTempFileName Temp_path, "Per", 0, Temp_file
TemporaryFileName = Left $ (Temp_file, INSTR (Temp_File, Chr $ (0)) - 1)
END FUNCTION
Private sub flow_load ()
DIM DB_FILE AS STRING
DIM RS as adodb.recordset
Note: Get The Database File Name.
DB_FILE = app.path
IF Right $ (DB_FILE, 1) <> "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ""
DB_FILE = DB_FILE & "dbpict.mdb"
Note: Open the Database Connection.
SET M_DBCONN = New Adodb.connection
m_dbconn.open _
"Provider = microsoft.jet.Oledb.4.0;" & _
"Data Source =" & DB_File & ";" & _ "Persist security info = false"
Note: Get the list of people.
SET RS = m_dbconn.execute ("Select Name from People By Name", AdcmdText)
Do While Not Rs.eof
Lstpeople.Additem RS! Name
rs.movenext
Loop
Rs.close
SET RS = Nothing
End Sub
PRIVATE SUB FORM_RESIZE ()
Lstpeople.height = scaleheight
End Sub
Note: Display the Clicked Person.
Private sub lstpeople_click ()
DIM RS as adodb.recordset
DIM BYTES () AS BYTE
DIM file_name as string
DIM file_num as integer
DIM FILE_LENGTH AS Long
DIM NUM_BLOCKS AS Long
Dim Left_over As Long
DIM Block_num as long
DIM HGT AS Single
PicPerson.visible = false
Screen.MousePointer = VBHOURGLASS
Doevents
Note: Get The Record.
SET RS = m_dbconn.execute ("SELECT * from people where name = Note:" & _
Lstpeople.Text & "Note:", AdcmdText)
IF RS.EOF THEN EXIT SUB
Note: Get a Temporary File Name.
FILE_NAME = TemporaryFileName ()
Note: Open the file.
FILE_NUM = FreeFile
Open file_name for binary as #file_num
Note: Copy The Data Into The File.
File_length = rs! FileLength
Num_blocks = file_ley / block_size
LEFT_OVER = file_length mod block_size
For block_num = 1 to num_blocks
Bytes () = rs! Picture.getChunk (block_size)
Put #file_num,, bytes ()
Next block_num
IF left_over> 0 Then
Bytes () = rs! Picture.getChunk (Left_OVER)
Put #file_num,, bytes ()
END IF
CLOSE #file_num
Note: Display The Picture File.
PicPerson.Picture = loadingPicture (file_name)
PicPerson.visible = true
Width = PicPerson.Left PicPerson.width width - Scalewidthhgt = PicPerson.top PicPerson.Height Height - ScaleHeight
IF HGT <1440 Then HGT = 1440
HEIGHT = HGT
Kill file_name
Screen.MousePointer = VBDefault
End Sub
Private sub mnurecordAdd_click ()
DIM RS as adodb.recordset
DIM PERSON_NAME AS STRING
DIM file_num as string
DIM file_length as string
DIM BYTES () AS BYTE
DIM NUM_BLOCKS AS Long
Dim Left_over As Long
DIM Block_num as long
Person_name = inputbox ("name")
If Len (Person_Name) = 0 THEN EXIT SUB
DLGPICTURE.FLAGS = _
CDLOFNFILEMUSTEXIST OR _
CDLOFNHIDEREADONLY OR _
CDLOFNEXPLORERERER
DLGPICTURE.CANCELERROR = TRUE
DLGPICTURE.FILTER = "Graphics Files | * .bmp; *. ICO; *. jpg; *. gif"
ON Error ResMe next
DLGPICTURE.SHOWOPEN
If Err.Number = CDLCANCEL THEN
EXIT SUB
Elseif Err.Number <> 0 THEN
Msgbox "Error" & format $ (Err.Number) &_
"Selecting File" & vbcrlf & err.description
EXIT SUB
END IF
Note: Open the Picture File.
FILE_NUM = FreeFile
Open DLGPICTURE.FILENAME for Binary Access Read as #file_num
File_length = Lof (file_num)
IF file_length> 0 THEN
Num_blocks = file_ley / block_size
LEFT_OVER = file_length mod block_size
SET RS = New Adodb.Recordset
rs.cursortype = adopenkeyset
rs.locktype = adlockoptimistic
Rs.open "Select Name, Picture, FileLength from People", M_Dbconn
rs.addnew
RS! Name = Person_Name
RS! FileLength = file_length
Redim Bytes (Block_size)
For block_num = 1 to num_blocks
Get #file_num,, bytes ()
RS! Picture.Appendchunk Bytes ()
Next block_num
IF left_over> 0 Then
Redim Bytes (Left_over) get #file_num,, bytes ()
RS! Picture.Appendchunk Bytes ()
END IF
Rs.Update
CLOSE #file_num
Lstpeople.Additem Person_name
Lstpeople.Text = person_name
END IF
End Sub
