var fs = require('fs');
var SQL = require('sql.js');
var filebuffer = fs.readFileSync('./resources/app.asar/app/data/sample.db');
var db = new SQL.Database(filebuffer);
function save_data(){
var name=document.getElementById('name').value;
var ip=document.getElementById('serverip').value;
var result=db.each("UPDATE Settings SET Name=$name, IP=$ip WHERE SettingsId=$set",{$name:name,$ip : ip,$set:1},function(row){console.log(row.name)});
var data = db.export();
var buffer = new Buffer(data);
fs.writeFileSync('./resources/app.asar/app/data/sample.db', buffer);
}
I was able to read the data from the database file inside the asar archive, but while writing the data into db file, it doesn't gets updated inside asar archive. So please help me crack this issue.
Asar is a read-only archive. It just concatenates all the files together into a single blob.
Related
newbie here,I could not find any example on Xamarin Forms read a local json file and display it. I need to do a local testing to read the local Json file.
1) Where do I save the json file for reading? in Android and iOS Projects or just in PCL project?
2) How to read the file?
here the code but it is not complete as I dont how to read the file.
using (var reader = new System.IO.StreamReader(stream))
{
var json = reader.ReadToEnd();
var rootobject = JsonConvert.DeserializeObject<Rootobject>(json);
whateverArray = rootobject.Whatever;
}
The code miss the Path and others which required.
You can directly add your JSON file in PCL. Then change build action to Embedded Resource
Now you can read Json data by:
var assembly = typeof("<ContentPageName>").GetTypeInfo().Assembly;
Stream stream = assembly.GetManifestResourceStream("Your_File.json");
using (var reader = new System.IO.StreamReader(stream))
{
var json = reader.ReadToEnd();
var data= JsonConvert.DeserializeObject<Model>(json);
}
I'm working on a project that all pdf files are encrypted on Web Server.
With XMLHttpRequest I get content of the encrypted pdf file. Then with JavaScript tools I decrypt the file. After all assign the content of file to a javascript variable as decrypted_file. All this is done at client side.
Here is what i want to do;
pdf.js renders and views pdf file that is located on web server or the same directory base.
How could I handle pdf.js to get content from javascript variable not url as "http//yourdomain.com/first-test.pdf or file as "first-test.pdf"?
Any answers are welcome, thank you.
Assuming that you are using the viewer.html of PDF.js, opening a PDF file from data is as easy as calling PDFViewerApplication.open with the right parameters.
Example: Typed arrays (Uint8Array / ArrayBuffer / ..)
// in viewer.html
var data = new Uint8Array( /* ... data ... */ );
PDFViewerApplication.open(data);
Example: Blob / File objects
// in viewer.html
var data = new Blob([ '%PDF....'] , {type: 'application/pdf'});
var url = URL.createObjectURL(data);
PDFViewerApplication.open(url);
Example: data URL (if supported by browser)
var url = 'data:application/pdf;base64,....';
PDFViewerApplication.open(url);
Example: data URL (any browser)
This consists of two steps: Decoding the base64 data-URL, and then converting the binary string to an Uint8Array.
var url = 'data:application/pdf;base64,....';
var data = url.split(';base64,')[1];
// Decode base64
var binaryString = atob(data);
// Convert binary string to Uint8Array
data = new Uint8Array(binaryString.length);
for (var i = 0, ii = binaryString.length; i < ii; ++i) {
data[i] = binaryString.charCodeAt(i);
}
PDFViewerApplication.open(data);
Example: Using PDF.js in a frame
<iframe src="viewer.html" id="pdfjsframe"></iframe>
<script>
var pdfjsframe = document.getElementById('pdfjsframe');
// At the very least, wait until the frame is ready, e.g via onload.
pdfjsframe.onload = function() {
var data = ... data here or elsewhere ... ;
pdfjsframe.contentWindow.PDFViewerApplication.open(data);
};
</script>
I'm using the ReportViewer control to display a server report in an ASP.NET page and I'm looking for a way to get the report into an object that I can then read and/or modify.
This kind of thing:
var rw = report.Width;
var t = ((Chart)report.Body.Item[3]).Title;
Is there a way, or am I stuck with parsing the XML file?
ETA:
I'm beginning to think I will need to access the XML file but I can't find out how to download that from the server, modify it (in memory) and then send it to the ReportViewer control.
ETA2:
Here's how to download the report definition (clean up left out for brevity):
// Download the report
var rs = new ReportingService2010();
rs.UseDefaultCredentials = true;
var reportDefinition = rs.GetItemDefinition("/DashboardReports/MyChart");
// Convert to XML
var ms = new MemoryStream(reportDefinition);
var doc = new System.Xml.XmlDocument();
doc.Load(ms);
// To load the stream into the report viewer
stream.Position = 0; // needed because we used the stream above - doc.Load(ms)
this.ReportViewer1.ServerReport.LoadReportDefinition(stream);
I'm writing a small application for myself and instead of using a database I'd like to just use Excel to store the small amount of data I have on my local file system. I want to be able to load that data without having to use the typical FileReference browse() method as it would just be annoying to do every time I use the application.
The code below seems to find the file fine as the file.exists method below and most of the other attributes seem to be correct but the file.data is always null.
I'm guessing this is a security issue and that's why I'm running into this problem but I thought I'd ask and see if there is in fact a way around this problem.
var file:File = new File(fullPath + "\\" + currentFolder + ".txt");
if(file.exists) {
var byteArray:ByteArray = file.data;
}
If you want to read the content of a file, use the following code:
var stream:FileStream = new FileStream();
stream.open("some path here", FileMode.READ);
var fileData:String = stream.readUTFBytes(stream.bytesAvailable);
trace(fileData);
The data property is inherited from FileReference class and it will be populated only after a load call (see this link).
You're close, you just need to combine that with a FileStream object
var fileStream:FileStream = new FileStream();
fileStream.open(file, FileMode.READ);
var str:String = fileStream.readMultiByte(file.size, File.systemCharset);
trace(str);
more info here
I have a string the user has typed and I want to save it into a file on the users harddrive. Can you do that? And if so, how?
Yes you can, with FileReference.
This is basically how it's done:
var bytes:ByteArray = new ByteArray();
var fileRef:FileReference=new FileReference();
fileRef.save("fileContent", "fileName");
Doesn't look too hard, does it?
And here's a video-tutorial on it too:
http://www.gotoandlearn.com/play?id=76
And the documentation:
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/
Hope that helps.
Since I had a function to output bytes to a file (because I was doing something with bitmaps), I reused it to output a string as well, like this:
var filename:String = "/Users/me/path/to/file.txt";
var byteArray:ByteArray = new ByteArray();
byteArray.writeUTFBytes(someString);
outFile(filename, byteArray);
private static function outFile(fileName:String, data:ByteArray):void {
var outFile:File = File.desktopDirectory; // dest folder is desktop
outFile = outFile.resolvePath(fileName); // name of file to write
var outStream:FileStream = new FileStream();
// open output file stream in WRITE mode
outStream.open(outFile, FileMode.WRITE);
// write out the file
outStream.writeBytes(data, 0, data.length);
// close it
outStream.close();
}
In addition, you must have Flash Player 10 and a Flex Gumbo SDK installed in your Flex Builder 3.
You can also have a look the following example:
http://blog.flexexamples.com/2008/08/25/saving-files-locally-using-the-filereference-classs-save-method-in-flash-player-10/
In Flex 3 no you can't do it unless you upload the file to the server and then download the file via a url to the desktop.
In Air or Flex 4 you can save it directly from the application to the desktop as detailed above.