How to update images

Question

1.00/5 (1 vote)

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Call Koneksi()
        Dim Cmd As SqlCommand
        Dim edit As String = "Update tbl_image set [Nama Barang]= @Nama_Barang , Jumlah= @Jumlah , [Stok Barang]=  @Stok_Barang , Gambar = @Gambar where Kode=  @Kode "
        Cmd = New SqlCommand(edit, Conn)
        Cmd.Parameters.AddWithValue("@Kode", TextBox1.Text)
        Cmd.Parameters.AddWithValue("@Nama_Barang", ComboBox1.Text)
        Cmd.Parameters.AddWithValue("@Jumlah", TextBox2.Text)
        Cmd.Parameters.AddWithValue("@Stok_Barang", TextBox3.Text)
        Dim MemoryStream As New MemoryStream
        PictureBox1.Image.Save(MemoryStream, System.Drawing.Imaging.ImageFormat.Bmp)
        Dim Dgambar As Byte() = MemoryStream.GetBuffer
        Dim Images As New SqlParameter("@Gambar", Dgambar)
        Images.Value = Dgambar
        Cmd.Parameters.Add(Images)
        Cmd.ExecuteNonQuery()
        MsgBox("Data Berhasil Di Update", MsgBoxStyle.Information, "Information")
        Call KondisiAwal()

What I have tried:

I entered this code to insert an image, but if I can't update it

Dim MemoryStream As New MemoryStream
        PictureBox1.Image.Save(MemoryStream, System.Drawing.Imaging.ImageFormat.Bmp)
        Dim Dgambar As Byte() = MemoryStream.GetBuffer
        Dim Images As New SqlParameter("@Gambar", Dgambar)
        Images.Value = Dgambar
        Cmd.Parameters.Add(Images)
        Cmd.ExecuteNonQuery()

Posted 22-Aug-19 4:20am

Smart Friend

Updated 22-Aug-19 10:30am

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Comments

Richard MacCutchan 22-Aug-19 11:28am

What errors do you receive?

Richard Deeming 22-Aug-19 11:29am

GetBuffer will return the underlying buffer, which may be longer than the data written to the stream. Use ToArray instead.

Other than that, you're going to need to provide a lot more details of the problem if you want anyone to be able to help you.

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Maciej Los · Accepted Answer · 2019-08-22T10:30:00

Well, seems your issue is: how to convert image to byte array and vice versa...

You can use these functions:

VB

'convert image to bytearray
Public Function imgToByteArray(ByVal img As Image) As Byte()
    Using mStream As New MemoryStream()
        img.Save(mStream, img.RawFormat)
        Return mStream.ToArray()
    End Using
End Function
'convert bytearray to image
Public Function byteArrayToImage(ByVal byteArrayIn As Byte()) As Image
    Using mStream As New MemoryStream(byteArrayIn)
        Return Image.FromStream(mStream)
    End Using
End Function

More at: Convert Image to Byte Array and Byte Array to Image c# , VB.Net[^]

Usage:

VB

Dim Dgambar As Byte() = imgToByteArray(PictureBox1.Image)
Dim img As New SqlParameter("@Gambar", Dgambar)
img.Value = Dgambar
Cmd.Parameters.Add(img)
Cmd.ExecuteNonQuery()