.NET environment provides a great set of methods to handle images and pictures. Sometimes you may need to "serialize" an image to simple array of bytes and later "deserialize" byte array back to the image.
VB.NET snippets below do the trick. Code uses MemoryStream object to convert image to bytes and back.
Imports System.Drawing.Imaging Imports System.IO
''' <summary> ''' Convert a byte array to an Image ''' </summary> ''' <param name="NewImage">Image to be returned</param> ''' <param name="ByteArr">Contains bytes to be converted</param> ''' <remarks></remarks> Public Sub Byte2Image(ByRef NewImage As Image, ByVal ByteArr() As Byte) ' Dim ImageStream As MemoryStream Try If ByteArr.GetUpperBound(0) > 0 Then ImageStream = New MemoryStream(ByteArr) NewImage = Image.FromStream(ImageStream) Else NewImage = Nothing End If Catch ex As Exception NewImage = Nothing End Try End Sub ''' <summary> ''' Convert an image to array of bytes ''' </summary> ''' <param name="NewImage">Image to be converted</param> ''' <param name="ByteArr">Returns bytes</param> ''' <remarks></remarks> Public Sub Image2Byte(ByRef NewImage As Image, ByRef ByteArr() As Byte) ' Dim ImageStream As MemoryStream Try ReDim ByteArr(0) If NewImage IsNot Nothing Then ImageStream = New MemoryStream NewImage.Save(ImageStream, ImageFormat.Jpeg) ReDim ByteArr(CInt(ImageStream.Length - 1)) ImageStream.Position = 0 ImageStream.Read(ByteArr, 0, CInt(ImageStream.Length)) End If Catch ex As Exception End Try End SubNotice that Image2Byte uses Jpeg-format. ImageFormat-class supports some other formats too, like Gif and Bmp. You may want to add required format as parameter, if needed.
1 comment:
Thank you! I used those principles in my project :)
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