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(Visual Basic 6.0) MIME -- Convert Base64 to BinaryLoads MIME containing a base64 body and converts it to binary. This changes the Content-Transfer-Encoding header to "binary", and the body is stored as raw unencoded bytes. The MIME file initially loaded in this example contains: Content-Disposition: attachment; filename="starfish20.jpg" Content-Type: image/jpeg; name="starfish20.jpg" Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+ pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9 DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q== After converting, the binary MIME looks like the following. (Note: Loading it into a text editor and saving it will corrupt the binary data by dropping bytes. Non-text binary data CANNOT be handled as if it were text without corruption.)
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim mime As New ChilkatMime Dim success As Long success = mime.LoadMimeFile("qa_data/mime/starfish20_base64.mim") If (success <> 1) Then Debug.Print mime.LastErrorText Exit Sub End If ' Show the MIME. We can see the body is base64 encoded. Dim mimeStr As String mimeStr = mime.GetMime() Debug.Print mimeStr ' Change the Content-Transfer-Encoding to "binary" success = mime.SetHeaderField("Content-Transfer-Encoding","binary") ' Note: Now that the MIME's body is binary (JPG image data), ' we CANNOT get the MIME as a string. We can only get it as bytes. Dim mimeBytes() As Byte mimeBytes = mime.GetMimeBytes() ' We can save it to a file, and then examine it.. Dim fac As New CkFileAccess success = fac.WriteEntireFile("qa_data/mime/starfish20_binary.mim",mimeBytes) If (success <> 1) Then Debug.Print fac.LastErrorText Else Debug.Print "Saved binary MIME." End If |
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