我移植vb4(16)到vb6遇到问题,读取PQ6(照片)数据,每次读取1024字节,在vb4中每次读取数据是1024,但是在vb4中读取的比1024长一些,而且每次长的大小不一样,这是为什么,代码如下.还有一个问题,vb4怎么调用vb6控件,例如textboxPrivate Sub Form_Load()
Dim StrDate As String
Dim ilen As Integer
Dim intCount As Long
Dim fileLena As Long
intCount = 1
StrDate = String$(1024, " ")
StatF = FreeFile
Open "C:\EC_SYS\TEMP\I_PAD.QF6" For Binary As #StatF
fileLena = FileLen("C:\EC_SYS\TEMP\I_PAD.QF6")
StatF1 = FreeFile
Open "C:\I_PAD.QF6" For Binary As StatF1
For intCount = 1 To 10
If intCount = 10 Then
MsgBox ("aaaa")
StrDate = String$(fileLena - 1024*9, " ")
Else
StrDate = String$(1024, " ")
End If
ilen = (intCount - 1) * 1024 + 1
Get #StatF, ilen, StrDate
Put StatF1, ilen, StrDate
Next
Close
End Sub
Dim StrDate As String
Dim ilen As Integer
Dim intCount As Long
Dim fileLena As Long
intCount = 1
StrDate = String$(1024, " ")
StatF = FreeFile
Open "C:\EC_SYS\TEMP\I_PAD.QF6" For Binary As #StatF
fileLena = FileLen("C:\EC_SYS\TEMP\I_PAD.QF6")
StatF1 = FreeFile
Open "C:\I_PAD.QF6" For Binary As StatF1
For intCount = 1 To 10
If intCount = 10 Then
MsgBox ("aaaa")
StrDate = String$(fileLena - 1024*9, " ")
Else
StrDate = String$(1024, " ")
End If
ilen = (intCount - 1) * 1024 + 1
Get #StatF, ilen, StrDate
Put StatF1, ilen, StrDate
Next
Close
End Sub
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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
If LenB(Dir("C:\I_PAD.QF6")) <> 0 Then
Kill "C:\I_PAD.QF6"
End If
FileCopy "C:\EC_SYS\TEMP\I_PAD.QF6", "C:\I_PAD.QF6"