I have a large amount of data in an XML file, and I'd like to append data to this file without rewriting it every time. I already know how to write the entire file out, but I'm struggling with how to append data to this file. Do you have a suggestion for how to do this?
XML isn't a good format for this - if you append to a previously-complete document, it's no longer a complete document.
One option (depending on the APIs available to you) is not to write the root tag or document declaration, but to fake them when you read the file. So you'd have:
Fake document declaration
Fake root open tag
Real data from the file
Fake root close tag
Then you can just append elements to the end of your file at will. It will depend on what you're trying to do with this file though - and whether you can fake a stream input which effectively "tops and tails" the real data in the file.
Related
What I'm trying to achieve is to intercept every write to a file and track the changes within the file. I want to track how much different the file content before and after the write.
So far in my minifilter driver I registered to IRP_MJ_WRITE callbacks and can now intercept writes to file. However I'm still not sure how can I obtain the content of the file before [preoperation] and the content after [postoperation].
The parameters that I have within the callback functions are:
PCFLT_RELATED_OBJECTS, PFLT_CALLBACK_DATA and I could not find anything related to the content of the file itself within these.
These are the operations that could change data in a file:
Modifying the file: IRP_MJ_WRITE, IRP_MJ_SET_INFORMATION ( specifically the FileEndOfFileInformation and FileValidDataLengthInformation information classes), IRP_MJ_FILE_SYSTEM_CONTROL ( specifically FSCTL_OFFLOAD_WRITE, FSCTL_WRITE_RAW_ENCRYPTED and FSCTL_SET_ZERO_DATA fsctl codes).
As for the content of the file itself that you just need to read it yourself.
If you mean the buffers as they are being written for example, check this out to find out more about the parameters of IRP_MJ_WRITE in the callback data. Esentially the buffer is at Data->Iopb->Parameters.Write.WriteBuffer/MdlAddress
Make sure you handle that memory correctly otherwise it will result a BSODs.
Good luck.
I'm using OpenXml SDK to generate word 2013 files. I'm running on a server (part of a server solution), so automation is not an option.
Basically I have an xml file that is output from a backend system. Here's a very simplified example:
<my:Data
xmlns:my="https://schemas.mycorp.com">
<my:Customer>
<my:Details>
<my:Name>Customer Template</my:Name>
</my:Details>
<my:Orders>
<my:Count>2</my:Count>
<my:OrderList>
<my:Order>
<my:Id>1</my:Id>
<my:Date>19/04/2017 10:16:04</my:Date>
</my:Order>
<my:Order>
<my:Id>2</my:Id>
<my:Date>20/04/2017 10:16:04</my:Date>
</my:Order>
</my:OrderList>
</my:Orders>
</my:Customer>
</my:Data>
Then I use Word's Xml Mapping pane to map this data to content control:
I simply duplicate the word file, and write new Xml data when generating new files.
This is working as expected. When I update the xml part, it reflects the data from my backend.
Thought, there's a case that does not works. If a customer has no order, the template content is kept in the document. The xml data is :
<my:Data
xmlns:my="https://schemas.mycorp.com">
<my:Customer>
<my:Details>
<my:Name>Some customer</my:Name>
</my:Details>
<my:Orders>
<my:Count>0</my:Count>
<my:OrderList>
</my:OrderList>
</my:Orders>
</my:Customer>
</my:Data>
(see the empty order list).
In Word, the xml pane reflects the correct data (meaning no Order node):
But as you can see, the template content is still here.
Basically, I'd like to hide the order list when there's no order (or at least an empty table).
How can I do that?
PS: If it can help, I uploaded the word and xml files, and a small PowerShell script that injects the data : repro.zip
Thanks for sharing your files so we can better help you.
I had a difficult time trying to solve your problem with your existing Word Content Controls, XML files and the PowerShell script that added the XML to the Word document. I found what seemed to be Microsoft's VSTO example solution to your problem, but I couldn't get this to work cleanly.
I was however able to write a simple C# console application that generates a Word file based on your XML data. The OpenXML code to generate the Word file was generated code from the Open XML Productivity Tool. I then added some logic to read your XML file and generate the second table rows dynamically depending on how many orders there are in the data. I have uploaded the code for you to use if you are interested in this solution. Note: The xml data file should be in c:\temp and the generated word files will be in c:\temp also.
Another added bonus to this solution is if you were to add all of the customer data into one XML file, the application will create separate word files in your temp directory like so:
customer_<name1>.docx
customer_<name2>.docx
customer_<name3>.docx
etc.
Here is the document generated from the first xml file
Here is the document generated from the second xml file with the empty row
Hope this helps.
I have a document management system which stores files in a MS Word format. In my application, I would like to be able to open that document in Word.
I would like Word to handle all of the file system access out of the content management system. What I need to do is the following:
1) Create a new document based off a template, and then provide information that can be parsed and placed into specific fields.
I see I can do this as follows:
Runtime.getRuntime().exec("C:/Program Files (x86)/Microsoft Office/Office15/winword.exe /ttemplate_name");
My assumption here is that the template is installed on the local drive. However I would like to provide some data so that fields could be prepopulated and I am not sure how to do that?
2) I would like to be able to run a macro to open the document directly from the content management system. I think I can run a macro as follows:
Runtime.getRuntime().exec("C:/Program Files (x86)/Microsoft Office/Office15/winword.exe /mmacro_name");
However, in this case, I would need to provide the document id from the content management system so that it can retrieve it and open it.
I am unsure what switch or parameter I can use to provide the additional data for word?
Thanks!
Word provides no command-line facility to pass arguments or data when opening or creating a document.
As long as macro code is available, the macro can read data that's stored somewhere, such as in an XML file. But the file path would need to be hard-coded or derivable from a known location (path).
You don't necessarily need to call a macro in a document (or template attached to the document). If the macro is named AutoNew or AutoOpen it will execute automatically when a document is created from the template or, respectively, when a document is opened.
'pickAndStore' method allows me to specify full path to the file, but I don't know it's extension at this point (file path has to be defined before file is uploaded, so it's not possible to provide a path with correct extension).
if I use 'pick' and then 'store' I have 2 files (because both methods uploads file to the s3). I can delete 'old' file, but it's not optimal and can be pain (take ages) with really big files.
Is there any better solution? Ideally to rename existing file.
Currently, there is no workaround for renaming file.
However, in our Javascript API v2 we are planing to add new callback function. onStart callback will be fired after user pick file but before file uploading. There could be option like renaming file based on original filename.
We will keep you updated.
I need to parse an XML file through a perl script. While parsing the file, I need to validate it with the corresponding xsd(schema definition) file. The xsd file contains some optional attribute with a default value being provided. I have to parse the xml file in such a way so that I should be able to fetch the default value for all the attribute that are not present in the XML(from xsd). The issue is that I couldn't find any appropriate parser in perl for this Job.I could find a parser that is able to validate the file but couldn't get the default value of attributes that are not present the XML.
Can you please suggest me any parser/module that can help me in getting the required data.
Note: I need the values of the attributes that are not present in the XML to make a complete record for database insertion.
Thanks for your time,
You might want to take a look at XML::Compile. It appears to me that the default values feature is supported, but I've never actually used the module at all.
You could also change the database schema so all fields have defaults.