没有发现适合于完成操作的成像组件 [英] No imaging component suitable to complete the operation was found

问题描述

我使用来自我的WPF应用程序的代码将图像插入到.mdb数据库中：

 Dim con As New OleDbConnection（ " Provider = Microsoft.ACE.OLEDB.12.0; Data Source ="& GetCurrentDirectory（）&" \ Data\rctts.mdb; Jet OLEDB：Database Password = arn33423342;"）
 con.Open（）
 Dim cmd As New OleDbCommand（" Insert into recents（Uname，Pic，Email）value（@ uname，@ pic，@ email）"，con）
 image1.Source = New BitmapImage（New Uri（" D：\ logo.png"））
 Dim buffer As Byte（）
 Dim bitmap = TryCast（image1.Source，BitmapSource）
 Dim encoder =新的PngBitmapEncoder（）
 encoder.Frames.Add（BitmapFrame.Create（bitmap））
使用stream = New MemoryStream（）
 encoder.Save（stream）
 buffer = stream .ToArray（）
结束使用
 cmd.Parameters.AddWithValue（" @ pic"，buffer）

`Pic`列或单元格的数据类型是OLE对象...无论如何，在插入数据后，我打开了我的数据库，我看到添加了一条新记录，但是`Pic的值`列是'长二进制数据'。无论如何，然后我继续在我的wpf应用程序中检索图像。我使用
这段代码？

 Dim cmd As New OleDbCommand（" Select * from recents" con）
 Dim table As New DataTable 
 Dim adapt As New OleDbDataAdapter（cmd）
 adapt.Fill （表）
如果table.Rows.Count< = 0那么
 Else 
 For Each row in table.Rows 
 recentbtn.Image.ImageSource = BytesToImage（CType（row（ 1），Byte（）））
 recentbtn.Names.Text = table.Rows（0）（0）.ToString 
 AddHandler recentbtn.MouseDown，AddressOf recentbtn_mousedow 
 RecentsList.stp.Children。添加（recentbtn）
下一个
结束如果
 loadingrecents.Visibility = Visibility.Hidden 
 End Sub 
私有共享函数BytesToImage（ByVal bytes As Byte（））As BitmapImage 
 Dim bm = New BitmapImage（）
使用stream作为MemoryStream = New MemoryStream （字节）
 stream.Position = 0 
 stream.Seek（0，SeekOrigin.Begin）
 bm.BeginInit（）
 bm.StreamSource = stream 
 bm。 CreateOptions = BitmapCreateOptions.PreservePixelFormat 
 bm.CacheOption = BitmapCacheOption.OnLoad 
 bm.EndInit（）
 End using 
返回bm 
结束函数

$
但它返回错误：没有找到适合完成操作的成像组件





$ b $ $ b $

解决方案

您好，

我有一个添加和读取图像的Windows窗体项目，所使用的方法应该适用于WPF他的主要代码是代码模块。

https://code.msdn.microsoft.com/Reading-and-writing-to-MS-945a0615?redir=0

I inserted an image into a .mdb database with this code from my WPF app :

Dim con As New OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" & GetCurrentDirectory() & "\Data\rctts.mdb;Jet OLEDB:Database Password=arn33423342;")
        con.Open()
        Dim cmd As New OleDbCommand("Insert into recents(Uname,Pic,Email)values(@uname,@pic,@email)", con)
        image1.Source = New BitmapImage(New Uri("D:\logo.png"))
        Dim buffer As Byte()
        Dim bitmap = TryCast(image1.Source, BitmapSource)
        Dim encoder = New PngBitmapEncoder()
        encoder.Frames.Add(BitmapFrame.Create(bitmap))
        Using stream = New MemoryStream()
        encoder.Save(stream)
            buffer = stream.ToArray()
        End Using
        cmd.Parameters.AddWithValue("@pic", buffer)

The `Pic` column or cell's data type is OLE Object...Anyway,after inserting the data,i opened my database,i saw that a new record was added but the value of the `Pic` column was `Long binary data`.Anyway,then i went on retrieving the image in my wpf app.I used this code ?

Dim cmd As New OleDbCommand("Select * from recents", con)
        Dim table As New DataTable
        Dim adap As New OleDbDataAdapter(cmd)
        adap.Fill(table)
        If table.Rows.Count <= 0 Then
        Else
            For Each row In table.Rows
recentbtn.Image.ImageSource = BytesToImage(CType(row(1), Byte()))
                recentbtn.Names.Text = table.Rows(0)(0).ToString
                AddHandler recentbtn.MouseDown, AddressOf recentbtn_mousedow
                RecentsList.stp.Children.Add(recentbtn)
            Next
        End If
        loadingrecents.Visibility = Visibility.Hidden
    End Sub
    Private Shared Function BytesToImage(ByVal bytes As Byte()) As BitmapImage
        Dim bm = New BitmapImage()
        Using stream As MemoryStream = New MemoryStream(bytes)
            stream.Position = 0
            stream.Seek(0, SeekOrigin.Begin)
            bm.BeginInit()
            bm.StreamSource = stream
            bm.CreateOptions = BitmapCreateOptions.PreservePixelFormat
            bm.CacheOption = BitmapCacheOption.OnLoad
            bm.EndInit()
        End Using
        Return bm
    End Function

But it's returning an error : No imaging component suitable to complete the operation was found

解决方案

Hello,

I have a windows forms project that adds and reads images, the methods used should work for WPF as the main code is in code modules.

https://code.msdn.microsoft.com/Reading-and-writing-to-MS-945a0615?redir=0

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