使用流对象保存和读取文件 打开vb6,新建工程。
添加两个按钮,一个image控件 注意:Access中的photo字段类型为OLE对象. SqlServer中的photo字段类型为Image
'** 引用 Microsoft ActiveX Data Objects 2.5 Library 及以上版本 ‘2.5版本以下不支持Stream对象 Dim iConcstr As String Dim iConc As ADODB.Connection
'保存文件到数据库中 Sub s_SaveFile() Dim iStm As ADODB.Stream Dim iRe As ADODB.Recordset Dim iConcstr As String
'读取文件到内容 Set iStm = New ADODB.Stream With iStm .Type = adTypeBinary '二进制模式 .Open .LoadFromFile App.Path + "\test.jpg" End With
'打开保存文件的表 Set iRe = New ADODB.Recordset With iRe .Open "select * from img", iConc, 1, 3 .AddNew '新增一条记录 .Fields("photo") = iStm.Read .Update End With
'完成后关闭对象 iRe.Close iStm.Close End Sub
Sub s_ReadFile() Dim iStm As ADODB.Stream Dim iRe As ADODB.Recordset '打开表 Set iRe = New ADODB.Recordset ‘得到最新添加的纪录 iRe.Open "select top 1 * from img order by id desc", iConc, adOpenKeyset, adLockReadOnly '保存到文件 Set iStm = New ADODB.Stream With iStm .Mode = adModeReadWrite .Type = adTypeBinary .Open .Write iRe("photo") ‘这里注意了,如果当前目录下存在test1.jpg,会报一个文件写入失败的错误. .SaveToFile App.Path & "\test1.jpg" End With
Image1.Picture = LoadPicture(App.Path & "\test1.jpg") '关闭对象 iRe.Close iStm.Close End Sub
Private Sub Command1_Click() Call s_ReadFile End Sub
Private Sub Command2_Click() Call s_SaveFile End Sub
Private Sub Form_Load() '数据库连接字符串 iConcstr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _ ";Data Source=F:\csdn_vb\database\保存图片\access图片\img.mdb"
‘下面的语句是连接sqlserver数据库的. ‘iConcstr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _ ‘ "User ID=sa;Password=;Initial Catalog=test;Data Source=yang"
Set iConc = New ADODB.Connection iConc.Open iConcstr End Sub
Private Sub Form_Unload(Cancel As Integer) iConc.Close Set iConc = Nothing End Sub | | |
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| #2楼 得分:50回复于:2008-09-24 15:49:49 建立一个专门的路径来存储文件,保存的时候只要把文件的路径保存到数据库就可以了,读取的时候根据路径去读取文件。 | |
使用流对象保存和读取文件
打开vb6,新建工程。
添加两个按钮,一个image控件
注意:Access中的photo字段类型为OLE对象.
SqlServer中的photo字段类型为Image
'** 引用 Microsoft ActiveX Data Objects 2.5 Library 及以上版本
‘2.5版本以下不支持Stream对象
Dim iConcstr As String
Dim iConc As ADODB.Connection
'保存文件到数据库中
Sub s_SaveFile()
Dim iStm As ADODB.Stream
Dim iRe As ADODB.Recordset
Dim iConcstr As String
'读取文件到内容
Set iStm = New ADODB.Stream
With iStm
.Type = adTypeBinary '二进制模式
.Open
.LoadFromFile App.Path + "\test.jpg"
End With
'打开保存文件的表
Set iRe = New ADODB.Recordset
With iRe
.Open "select * from img", iConc, 1, 3
.AddNew '新增一条记录
.Fields("photo") = iStm.Read
.Update
End With
'完成后关闭对象
iRe.Close
iStm.Close
End Sub
Sub s_ReadFile()
Dim iStm As ADODB.Stream
Dim iRe As ADODB.Recordset
'打开表
Set iRe = New ADODB.Recordset
‘得到最新添加的纪录
iRe.Open "select top 1 * from img order by id desc", iConc, adOpenKeyset, adLockReadOnly
'保存到文件
Set iStm = New ADODB.Stream
With iStm
.Mode = adModeReadWrite
.Type = adTypeBinary
.Open
.Write iRe("photo")
‘这里注意了,如果当前目录下存在test1.jpg,会报一个文件写入失败的错误.
.SaveToFile App.Path & "\test1.jpg"
End With
Image1.Picture = LoadPicture(App.Path & "\test1.jpg")
'关闭对象
iRe.Close
iStm.Close
End Sub
Private Sub Command1_Click()
Call s_ReadFile
End Sub
Private Sub Command2_Click()
Call s_SaveFile
End Sub
Private Sub Form_Load()
'数据库连接字符串
iConcstr = "Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False" & _
";Data Source=F:\csdn_vb\database\保存图片\access图片\img.mdb"
‘下面的语句是连接sqlserver数据库的.
‘iConcstr = "Provider=SQLOLEDB.1;Persist Security Info=True;" & _
‘ "User ID=sa;Password=;Initial Catalog=test;Data Source=yang"
Set iConc = New ADODB.Connection
iConc.Open iConcstr
End Sub
Private Sub Form_Unload(Cancel As Integer)
iConc.Close
Set iConc = Nothing
End Sub
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