Re: Writing, then reading JSON
Re: Writing, then reading JSON
- Subject: Re: Writing, then reading JSON
- From: Charles Jenkins <email@hidden>
- Date: Mon, 22 Sep 2014 13:07:53 -0400
Well, thank you to anyone who spared any thought for this problem. After I added the test below, with reconstitutedStructureDict and reconstitutedProj, I discovered that everything started working and the files could be written to and read from disk without error. Then I was able to go back and delete the “reconstituted” test lines, and everything still works. I have no explanation.
--
Charles
On Sunday, September 21, 2014 at 19:10, Charles Jenkins wrote:
> Just as a test, I changed my writer method to immediately try to interpret the JSON data and reconstitute the project’s data:
>
> let structureDict = theProject.getStructureDictionary()
> let jsonData = NSJSONSerialization.dataWithJSONObject( structureDict, options: nil, error: outError )
> if let reconstitutedStructureDict = NSJSONSerialization.JSONObjectWithData( jsonData!, options: nil, error: outError ) as? NSDictionary {
> var reconstitutedProj = DocumentNode.readFromWrapperViaStructureDictionary( parentWrapper: theFileWrapper!, dictionary: reconstitutedStructureDict )
> }
>
> All this works: reconstitutedStructureDict is a copy of structureDict, and reconstitutedProj is a copy of theProject. And the JSON file that gets written out appears okay, so my problem seems to be that NSFileWrapper.regularFileContents isn’t returning usable data.
>
> —
>
> Charles Jenkins
>
>
> On Friday, September 19, 2014 at 11:45 AM, Charles Jenkins wrote:
>
> > My document structure is a file wrapper containing a bunch of RTF documents and a file called structure.json which describes how they relate to one another.
> >
> > I write out the structure file like this:
> >
> > let structureDict = theProject.getStructureDictionary()
> > let jsonData = NSJSONSerialization.dataWithJSONObject( structureDict, options: nil, error: outError )
> >
> > writeFileToWrapper(
> > parentWrapper: theFileWrapper!,
> > filename: structureFileName,
> > data: jsonData,
> > err: outError
> > );
> >
> >
> > I’m not including the bodies of getStructureDictionary() or writeFileToWrapper() because they seem to work just fine. The structure.json file appears in my output package, and if I open it using TextWrangler, I see exactly the JSON content I expect, stored in UTF8 encoding.
> >
> > The thing is, my app can’t read it back in. Here’s the function that’s not working:
> >
> > override func readFromFileWrapper(
> > parentWrapper: NSFileWrapper!,
> > ofType typeName: String!,
> > error outError: NSErrorPointer
> > ) -> Bool
> > {
> > if let fw = parentWrapper.fileWrappers[ structureFileName ] as? NSFileWrapper {
> > if let data = fw.regularFileContents? {
> > let debug: String = NSString( data: data, encoding: NSUTF8StringEncoding )
> > let obj: AnyObject? = NSJSONSerialization.JSONObjectWithData( data, options: nil, error: outError )
> > if let structureDict = obj as? NSDictionary {
> > var proj = DocumentNode.readFromWrapperViaStructureDictionary( parentWrapper: parentWrapper, dictionary: structureDict )
> > theProject = proj
> > theFileWrapper = parentWrapper
> > return true
> > }
> > }
> > }
> > return false;
> > }
> >
> >
> > I expect I’ll find bugs in readFromWrapperViaStructureDictionary() if I ever call it, but I never get that far.
> >
> > With Swift and Xcode, stepping line-by-line through code it a bit confusing because the current line indicator bounces all around, sometimes appearing on lines of code already executed. But to be best of my belief, my problem is that obj can’t be converted to an NSDictionary. I inserted the debug: String to see what’s read from the file, and it comes back as garbage.
> >
> > Is calling regularFileContents the wrong way to read up my JSON file?
> >
> > —
> >
> > Charles Jenkins
> >
>
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