WPF vb.net没有找到适合完成操作的成像组件 [英] No imaging component suitable to complete the operation was found WPF vb.net

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：

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)

Pic 列或单元格的数据类型是OLE对象...无论如何，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 Pic 列的值是长二进制数据 .Anyway，然后我继续在我的wpf应用程序中检索图像。我使用了这段代码？

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

但它返回错误：找不到适合完成操作的成像组件

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

推荐答案

修正了......对于将来遇到此错误的人：

Fixed it...For anyone who faces this error in future :

1. 确保以正确的方式插入数据（有时数据库中的数据损坏会导致此类错误）

2。您不需要做一些繁重的编码就可以将图像转换为字节！

2 . You don't need to do some heavy coding to convert the image to byte!

最后，让我们的代码：

   Public Sub read()
    con.Open()
    Dim cmd As New OleDbCommand("Select * from recents", con)
    Dim _dr As OleDbDataReader
    _dr = cmd.ExecuteReader
    Dim _photo As Byte()
    While _dr.Read()
            Try
            _photo = CType(_dr(1), Byte())
            Dim strm As MemoryStream = New MemoryStream(_photo)
                Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(strm)
                Dim bi As BitmapImage = New BitmapImage()
                bi.BeginInit()
                Dim ms As MemoryStream = New MemoryStream()
                img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp)
                ms.Seek(0, SeekOrigin.Begin)
                bi.StreamSource = ms
                bi.EndInit()
            image1.Source = bi
        Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try
    End While

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