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Read text-segment from binary fileI have some binary files (jpeg), which contain a lot of image-data - and some embedded XML (XMP actually). If I view the file in a hex-editor, there is a lot of binary data - and then in the middle of everything: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> [etc etc] I need to load this file in some kind of reader, search for the <?xml as start and </plist> as the end of the xml, and return this string for further processing. How do I do that? I tried just loading it into a streamreader to check out what happened, but I only got garbage from the reader... Any help will be greatly appreciated :) Regards - Klaus You have to read the file as binary data. Then you can extract the part
of it that is the xml file and decode that to a string. Klaus Jensen wrote: Show quoteHide quote > Hi > > I have some binary files (jpeg), which contain a lot of image-data - and > some embedded XML (XMP actually). > > If I view the file in a hex-editor, there is a lot of binary data - and then > in the middle of everything: > > <?xml version="1.0" encoding="UTF-8"?> > <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" > "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> > <plist version="1.0"> > [etc etc] > > I need to load this file in some kind of reader, search for the <?xml as > start and </plist> as the end of the xml, and return this string for further > processing. > > How do I do that? > > I tried just loading it into a streamreader to check out what happened, but > I only got garbage from the reader... > > Any help will be greatly appreciated :) > > Regards > > - Klaus > > "Göran Andersson" <gu***@guffa.com> wrote in message Could you give an example, please? Working with the binary-objects is new to news:O2ECFoNjGHA.4748@TK2MSFTNGP04.phx.gbl... > You have to read the file as binary data. Then you can extract the part of > it that is the xml file and decode that to a string. me. you can just use a stream reader and loop untill you reach the XML from
that point you read all the data in a string untill you read the end of the XML Dim sr As New System.IO.StreamReader("C:\afile.bin") Do Until sr.EndOfStream Debug.WriteLine(sr.ReadLine) Loop note that readline returns a string object hth Michel Posseth [MCP] Show quoteHide quote "Klaus Jensen" <spammers@burninhell.com> schreef in bericht news:uiWltLOjGHA.4284@TK2MSFTNGP05.phx.gbl... > "Göran Andersson" <gu***@guffa.com> wrote in message > news:O2ECFoNjGHA.4748@TK2MSFTNGP04.phx.gbl... >> You have to read the file as binary data. Then you can extract the part >> of it that is the xml file and decode that to a string. > > Could you give an example, please? Working with the binary-objects is new > to me. > > You can't read a binary file using a StreamReader.
Michel Posseth [MCP] wrote: Show quoteHide quote > you can just use a stream reader and loop untill you reach the XML from > that point you read all the data in a string untill you read the end of the > XML > > Dim sr As New System.IO.StreamReader("C:\afile.bin") > > Do Until sr.EndOfStream > > Debug.WriteLine(sr.ReadLine) > > Loop > > note that readline returns a string object > > hth > > Michel Posseth [MCP] > > "Klaus Jensen" <spammers@burninhell.com> schreef in bericht > news:uiWltLOjGHA.4284@TK2MSFTNGP05.phx.gbl... >> "Göran Andersson" <gu***@guffa.com> wrote in message >> news:O2ECFoNjGHA.4748@TK2MSFTNGP04.phx.gbl... >>> You have to read the file as binary data. Then you can extract the part >>> of it that is the xml file and decode that to a string. >> Could you give an example, please? Working with the binary-objects is new >> to me. >> >> > > Klaus Jensen wrote:
> "Göran Andersson" <gu***@guffa.com> wrote in message If the file is not too large, you could read it all into a byte array. > news:O2ECFoNjGHA.4748@TK2MSFTNGP04.phx.gbl... >> You have to read the file as binary data. Then you can extract the part of >> it that is the xml file and decode that to a string. > > Could you give an example, please? Working with the binary-objects is new to > me. > Then locate the data in the array and create a MemoryStream from that section of the array, and use a StreamReader to read it. Hello Klaus,
I strongly recommend you read the document at: http://partners.adobe.com/public/developer/en/xmp/sdk/xmpspecification.pdf Small Excerpt from page 93: JPEG In JPEG files, an APP1 marker designates the location of the XMP Packet. The following table shows the entry format. Byte Offset : Field value : Field name : Length(bytes) : Comments 0 : 0xFFE1 : APP1 : 2 : APP1 marker. 2 : 2 + length of namespace (29) + length of XMP Packet : Lp : 2 : Size in bytes of this count plus the following two portions. 4 : Null-terminated ASCII string without quotation marks. : namespace : 29 : XMP namespace URI, used as unique ID: http://ns.adobe.com/xap/1.0/ 33 : < XMP Packet > : : Must be encoded as UTF-8.The header plus the following data must be less than 64 KB bytes. The XMP Packet cannot be split across the multiple markers, so the size of the XMP Packet must be at most 65502 bytes. -Boo Show quoteHide quote > Hi > > I have some binary files (jpeg), which contain a lot of image-data - > and some embedded XML (XMP actually). > > If I view the file in a hex-editor, there is a lot of binary data - > and then in the middle of everything: > > <?xml version="1.0" encoding="UTF-8"?> > <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" > "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> > <plist version="1.0"> > [etc etc] > I need to load this file in some kind of reader, search for the <?xml > as start and </plist> as the end of the xml, and return this string > for further processing. > > How do I do that? > > I tried just loading it into a streamreader to check out what > happened, but I only got garbage from the reader... > > Any help will be greatly appreciated :) > > Regards > > - Klaus > 
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