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3#
楼主 |
发表于 2003-6-28 18:31:00
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只看该作者
没看懂我就是想问一下文件怎么以二进制形式包存在access数据表中的ole字段里。必须用vba吗?看不懂呀。帮帮我
Option Compare Database
Option Explicit
Public Function GetFromFile(strTable As String, strField As String, strFilter As String, objFileName As String) As Boolean
'============================================================
' 过程函数名: CommModule.GetFromFile 类型:Function
' 参数:
' strTable (String) :准备保存图形数据的表名称
' strField (String) :准备保存图形数据的字段名称
' strFilter (String) :打开表的过滤字符串,用于定位并确保被打开的表的数据的唯一性
' objFileName (String) :准备输入到表里边的图象文件名称
' 返回:如果保存成功,返回True,如果失败,返回False
'-------------------------------------------------------------
' 说明:把图象文件的数据保存到表里边
'-------------------------------------------------------------
' 修订历史:
'=============================================================
Dim recset As ADODB.Recordset, FileData() As Byte, FileNo As Long, FileSize As Long, strSQL As String
strSQL = "Select " & strField & " From " & strTable & " Where " & strFilter & ";"
Set recset = New ADODB.Recordset
recset.Open strSQL, CurrentProject.Connection, adOpenDynamic, adLockOptimistic
GetFromFile = True
If recset(strField).Type <> DB_OLE Or Not IsFileName(objFileName) Then
GetFromFile = False '如果字段不是OLE字段,或者文件不存在,返回错误
GoTo EndGetFromFile
End If
If recset.EOF Then '如果记录不存在,返回错误
GetFromFile = False
GoTo EndGetFromFile
End If
FileSize = GetFileSize(objFileName) '如果被打开的文件大小为零,返回错误
If FileSize <= 0 Then
GetFromFile = False
GoTo EndGetFromFile
End If
ReDim FileData(FileSize) '重新初始化数组
FileNo = FreeFile '获取一个空闲的文件号
Open objFileName For Binary As #FileNo '打开文件
Get #FileNo, , FileData() '读取文件内容到数组
Close #FileNo '关闭文件
recset(strField).value = FileData() '保存数据
recset.Update '更新数据
Erase FileData '释放内存
EndGetFromfile:
recset.Close '关闭RecordSet
Set recset = Nothing '释放内存
End Function
Public Function SaveToFile(strTable As String, strField As String, strFilter As String, strFileName As String) As Boolean
'============================================================
' 过程函数名: CommModule.SaveToFile 类型:Function
' 参数:
' strTable (String) :保存图形数据的表名称
' strField (String) :保存图形数据的字段名称
' strFilter (String) :打开表的过滤字符串,用于定位并确保被打开的表的纪录的唯一性
' strFileName (String) :准备保存的图象的文件名称
' 返回:如果保存成功,返回True,如果失败,返回False
'-------------------------------------------------------------
' 说明:把由GetFromFile函数保存到表中OLE字段的数据还原到文件
'-------------------------------------------------------------
' 修订历史:
'=============================================================
Dim recset As ADODB.Recordset, FileData() As Byte, FileNo As Long, FileSize As Long, strSQL As String
strSQL = "Select " & strField & " From " & strTable & " Where " & strFilter & ";"
Set recset = New ADODB.Recordset
recset.Open strSQL, CurrentProject.Connection, adOpenDynamic, adLockOptimistic
SaveToFile = True
If recset(strField).Type <> DB_OLE Then
SaveToFile = False '如果字段不是OLE字段,返回错误
GoTo EndSaveToFile
End If
If recset.EOF Then '如果记录不存在,返回错误
SaveToFile = False
GoTo EndSaveToFile
End If
FileNo = FreeFile
Open strFileName For Binary As #FileNo
ReDim FileData(recset(strField).ActualSize) '重新初始化数组
FileDa |
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