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I have a page with data retrieving from user:
Name, landline no, Question to ask and Timings..Once i click on button of this page, say callback.aspx, it will generate a xml file automatically with a file name userinfo.xml
Now i try to read this file in another .aspx page say read.aspx from userinfo.xml...Everything is working fine..except for..
If another user enters info in callback and submits. And when i check it from read.aspx or userinfo.xml the previous data is lost and the new data is written...Is there any possibility that dynamically data can be appended to userinfo.xml
Please help..the following is the code in callback.aspx
string xmlFile = Server.MapPath("userInfo.xml");
XmlTextWriter writer = new XmlTextWriter(xmlFile, Encoding.UTF8);
//start writing
writer.WriteStartDocument();
writer.WriteComment("Posted on @" + DateTime.Now.ToString());
writer.WriteStartElement("UI");
//creating the <browserinfo> element
writer.WriteElementString("name", sname);
writer.WriteElementString("landline",slandline);
writer.WriteElementString("question",squestion);
writer.WriteElementString("time",stime);
writer.WriteElementString("Date",DateTime.Now.ToString());
writer.WriteEndElement();
writer.WriteEndDocument();
writer.Close();
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Well, you've got a few problems to deal with here. First of all is this line:
lehya wrote: XmlTextWriter writer = new XmlTextWriter(xmlFile, Encoding.UTF8);
This is a shortcut to remove some of the tedium of opening a file. But, its assumption is that you want to erase the old file if one is there, not append to it.
The second problem is that you're dealing with an XML file. You can't just append to the end of the file. You have to add your new elements as a part of the existing document.
Appending to the end of an XML document is not easy. You have some options though. Open the XML in an XmlDocument object and just append your child nodes in there where appropriate, then save the file. If the XML file is big, this will take up lots of memory and be slow. Another option is to open up the existing file with an XmlReader and open up a temporary file with an XmlWriter. Read the existing XML until you get to the end of the document and while you're doing it, write those elements out to the writer. Before writing the EndDocument, write in your new elements. Then delete the old file and rename the temp file to the correct filename.
Logifusion[^]
If not entertaining, write your Congressman.
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Thanks buddy...Sounds like it works..But reading everything and writing into a temporary file...saving it as a new file..oh this sounds too hard..but i will try
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You could also write to a MemoryStream so long as the XML is not too big. The MemoryStream will have a smaller memory footprint than the XmlDocument object.
Logifusion[^]
If not entertaining, write your Congressman.
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Hi lehya,
First check whether the xml file exists, If not create xml [ u have done this], if exists load xml file, get the root node element and append every node you add as as child node [plz don`t use processing instructions while appending to xml] and save the xml.
<ex: <Contact_info> => Root Element
<contacts>
<name>test</name>
<age>35</age>
<sex>M</sex>
</contacts>
<contacts>
<name>test</name>
<age>35</age>
<sex>M</sex>
</contacts>
</Contact_info>
-- modified at 4:38 Saturday 19th August, 2006
Regards,
Manowj
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You're probably already past this, but I've seen this question enough times that I thought I might write an article on it. Link[^]
Logifusion[^]
If not entertaining, write your Congressman.
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I have a series of tables in MS Access 2003 and would like to export a subset of the data out in an XML format.
I have come accross the Application.ExportXML facility in MS Access 2003, but is this applicable if I need to export 2 fields from Table A, 3 from Table B and 1 from Table C.
My question is, should I write a VBA module to export the data I require or are they an example on how to use Application.ExportXML in the way required.
I cant find much documentation on this facility.
Sorry if this is the wrong forum.
Many thanks
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Create a query containing your required fields then use Application.ExportXML with the query as your DataSource.
Application.ExportXML _
ObjectType:=acExportQuery, _
DataSource:="YourQuery", _
DataTarget:="Path\YourFile.xml"
The above shows the required properties. For a list of additional (optional) properties, see the Access 2003 help file for the ExportXML method.
Steve
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Hey guys!
I'm kind of new to XML using VC++ 6.0.
I know XML DOM and XML MiniDOM from python...
and I use MSXML4.0.
anyway, I try to create an element, or a node,
and as I run my little application it carshed due to "Access violation"
the exception occures in the functions
raw_createElement(...) and raw_createNode(...)
it happens all the time, and frankly I really don't know what the heck is wrong in there....
here is a fragment of my source:
#define PHONEBOOK_NODE _T("Node")
hr= m_pDomDocument.CreateInstance("Msxml2.DOMDocument.4.0");
sprintf(node, "%ld", m_NodeID);
l_XMLNode = m_pDomDocument->createNode(l_vtType, _T(node), _T(""));
l_XMLElement = m_pDomDocument->createElement(PHONEBOOK_NODE);
where:
m_pDomDocument is IXMLDOMDocument2Ptr
l_XMLNode is IXMLDOMNodePtr
l_XMLElement is IXMLDOMElementPtr
I'll be very glad (and so my boss) if someone will be kind to
share his or her opinion about that...
thanx,
Adidas
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adidas.levy wrote: I'm kind of new to XML using VC++ 6.0.
I know XML DOM and XML MiniDOM from python...
Are you saying you are new to C++ development? If so you are "starting" off with a much to complex project.
An "Access Violation" is not a XML/XSL problem it is a C++ problem so this question belongs in the Visual C++/MFC forum.
led mike
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Hey,
No, I'm not new to C++ programming, I'm programming C++ for over 3 years.
I am used to program under UNIX operating systems and not under Windows.
recently I started programming under Windows...
anyway, I solved the problem, I just had an additional call to "CoInitialize()" which caused the problem....
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Hi All
First of all thanks for your valuable time. I am new to XML and i have very basic query.I need to generate my AsP.NET MENUS through XML and i build the XML file as below
<code><?xml version="1.0" encoding="utf-8"?>
<Menus xmlns="http://tempuri.org/XYZ.xsd">
<Menu Name="Electronics">
<ChildName>TV</ChildName>
<ChildUrl>//localhost/Tv.aspx</ChildUrl>
<ChildName>Mp3 Player</ChildName>
<ChildUrl>//localhost/MP3.aspx</ChildUrl>
</Menu>
<Menu Name="Furniture">
<ChildName>Tables</ChildName>
<ChildUrl>//localhost/tables.aspx</ChildUrl>
<ChildName>Chairs</ChildName>
<ChildUrl>//localhost/chair.aspx</ChildUrl>
<ChildName>Beds</ChildName>
<ChildUrl>//localhost/beds.aspx</ChildUrl>
so on.......
</Menu>
</Menus></code>
How i can read these XML nodes values???? I am confused and i tried dom, xmltextreader etc.......I am not sure which is the best way to use and how to use. I can load XML document but after that i am not able to read these nodes values....I am using ASP.Net, VB.Net version 1.x
Please provide some good sample source code. Thanks in advance for your help....One small request please help me ASAP.
Amit
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Define Dataset and read the XML in DataSet like
ds.readXML(FilePath)
and here you go.. you have the details do what ever you want.
there are many other ways to read the XML but this is the easiest among all.
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Thanks for your reply. And it really helps me to move one step. Now i am facing another problem. I am able to load my menus through xml, but it is taking some time to load. Moreover my other frmaes loaded before menus load..... Any thoughts???
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Hi,
I am sorry if this is a very basic question.
I am new to XMLs.
I am using .net XMLDocument class to operate with xml files.
I would like to know what is the significance of a namespace when parsing XMLs. what and why is a namespace used?
Thanks.
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VSush wrote: what and why is a namespace used?
The base reason for "namespace" support in any code based language is to reduce name collisions.
so if you want an xml element named ECustom and so do I we can't use them both in a single document. However if we add a namespace then they become
VSush.ECustom
and
led-mike.ECustom
So now they are two different elements and both can be used in a single document without ambiguity.
led mike
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Adding to led mike's answer,
Preventing name collisions is the major reason for using namespaces. Nevertheless, the grouping of names for a specific purpose is a pleasant side-affect of this. Thus, for example, you can have elements that refer to schemas, html, xslt and xml in the same document.
George
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Hi ALL,
QUESTION: 1
___________
I have an XML file in which I've put an Image data inline, like the following.
<?xml version="1.0" encoding="utf-16"?>
<Data xmlns:dt="urn:schemas-microsoft-com:datatypes"
dt:dt="bin.base64">/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAsHCAkIBwsJCQkMCwsNEBoREA8PECAXGBMaJiIo
KCYiJSQqMD0zKi05LiQlNUg1OT9BREVEKTNLUEpCTz1DREH/2wBDAQsMDBAOEB8RER9BLCUs
QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUH/wAAR
CABiAGADASIAAhEBAxEB/8QWqPcDcEmhaNC2Sik+8Vzwo/8Ahr8hSpUESTvhp+BflXfD
QfcX5UqVaTIuRfwj5UuRM/ZX5UqVdOi5V/CPlSKKceyPlSpV06Lw0PVFPwpv+Hgz/Bj/APEU
qVdNjhGg6Io+FdVVByFHypUq2ZP/2Q==</Data>
I am able to show the image in the HTML file like this.
<HTML>
<BODY>
<img src="data:image/gif;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAsHCAkIBwsJCQkMCwsNEBoREA8PECAXGBMaJiIo
KCYiJSQqMD0zKi05LiQlNUg1OT9BREVEKTNLUEpCTz1DREH/2wBDAQsMDBAOEB8RER9BLCUs
QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUH/wAAR
CABiAGADASIAAhEBAxEB/8QWqPcDcEmhaNC2Sik+8Vzwo/8Ahr8hSpUESTvhp+BflXfD
QfcX5UqVaTIuRfwj5UuRM/ZX5UqVdOi5V/CPlSKKceyPlSpV06Lw0PVFPwpv+Hgz/Bj/APEU
qVdNjhGg6Io+FdVVByFHypUq2ZP/2Q=="/>
</BODY>
</HTML>
But, I'd like to bring the inline image data from XML to HTML. I am able to do this for normal text data, something like this:
<html>
<body>
<xml id="cdcat" src="cd_catalog.xml"></xml>
<table border="1" datasrc="#cdcat">
<tr>
<td><span datafld="ARTIST"></span></td>
<td><span datafld="TITLE"></span></td>
</tr>
</table>
</body>
</html>
Since I'm a newbie to XML, kindly bear if you feel this a silly question.
QUESTION: 2 - Inline Video data
_________________________________
I've embedded a Windows Media Player and able to play a .WMV file, like this:
<html>
<body>
<embed width="320" height="290" src="video.wmv"
autostart="True"
showcontrols="True" showstatusbar="False"
showdisplay="False" autorewind="True">
</embed>
</body>
</html>
How to make the Base64 encoded video data inline.
Kindly bear this lengthy question.
Thanks in advance,
Sarvan AL
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Sarvan AL wrote: I am able to show the image in the HTML file like this.
I loaded that HTML file in both IE and Firefox and the image does NOT display, so.... what are you talking about?
led mike
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It didn't work for me either using IE 6. The following information is interesting:
http://dean.edwards.name/weblog/2005/06/base64-ie/[^]
I believe IE 6 or less needs assistance to display base64! Other browsers don't have this problem.
-- modified at 20:07 Thursday 10th August, 2006
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Yeah his image data is not valid. The one in the dean.edwards blog entry is valid and works in Firefox.
George L. Jackson wrote: I believe IE 6 or less needs assistance to display base64
What does "assistance" mean, an ActiveX control?
led mike
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In the dean.edwards blog, he is using a server-based script and javascript to "correct" the base64 data to display in IE6. He presents some different approaches to solve the problem.
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I'm really sorry for giving an invalid image data. Now I got the stuff using XSL. This is how I did. The XML file(say, img.xml) contains the image data inline.
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="img.xsl"?>
<MusicDirectors>
<musician>
<name>A R Rahman</name>
<country>India</country>
<photo>data:image/gif;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAsHCAkIBwsJCQkMCwsNEBoREA8PECAXGBMaJiIo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</photo>
</musician>
</MusicDirectors>
And here is the XSL file(img.xsl)
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="utf-8" />
<xsl:template match="MusicDirectors">
<html>
<body>
<font face="verdana" size="1">
<table>
<xsl:for-each select="musician">
<TR> <TD rowspan="7"> <img src="{photo}" width="75" height="75"/> </TD> </TR>
<TR> <TD height="5"> Name : </TD> <TD> <xsl:value-of select="name"/> </TD> </TR>
<TR> <TD height="5"> Country : </TD> <TD> <xsl:value-of select="country"/> </TD> </TR>
</xsl:for-each>
</table>
</font>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
Now I'd like to use the same stuff for INLINE AUDIO/VIDEO data, so that the entire information would be in a single XML file.
Since IE is not supporting this Base64 encoding, I need to know how to make this IE compliant. I hope it's possible by means of Java Script. But I haven't worked on Java Script. If you have any idea, kindly share with me and let me know the importance of Embedding Inline Binary data in XML.
Sarvan AL
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I encoded a .wmv file in to base64 format and placed as a tag in XML.
Is there any way to play that encoded video file in the browser's embeded player( any player ) ?
Which player is encoded video compatible ?
I used base64 encoding for jpg file. it is working properly. i can view the encoded jpg file in the browser. In the same way is there any possbility to play the encoded video file in the browser ?
Which encoding is optimal for video ?
What is the role of CODEC in video encoding ?
Karthik M
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No. You can't really do that. All you havwe done is ASCII encoded the binary data and potentially added a massive overhead to the processing. You cant just past such an encoded object to a video player and it can work out what to do with it. I personally would never encode video data into base64 and then embedd it in XML. That is asking for trouble.
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