[Drawkit] any help with read/write

[James Maxwell]

This is great! Thanks, Brad.

I'll look into this over the next couple of days.

cheers,

J.

On 8-Aug-08, at 8:06 AM, Brad Larson wrote:

>
> On Aug 7, 2008, at 9:50 PM, James Maxwell wrote:
>
>> In particular, I'm wondering how to get a DKDrawingDocument-based  
>> app to save to my own file type, extension, and all that. I have it  
>> working, for now, just using the defaults of "Drawing" and  
>> ".drawing", but I'd like to get my own file type and extension  
>> implemented.
>>
>> A quick list of steps would be a huge help.
>>
>
> First, you'll want to create a category on DKDrawing that will  
> handle your custom file format.  Within that category, create two  
> methods, a class method that takes in an NSData object and returns a  
> new DKDrawing, and an instance method that returns an NSData  
> object.  The first is your loading method, the second your saving one.
>
> Next, you'll need to set up the file extension or UTI to use in your  
> application's Info.plist.  To set up a simple file extension, go to  
> your Xcode project, click on the Targets tab, click on your  
> application's target, and click the Get Info button.  In the  
> inspector, go to the Properties tab and add a new document type.   
> Give it a name (for example "Pattern"), leave the UTI field blank,  
> set the appropriate extension (or extensions) for this file format,  
> set the class to be your new custom document class, give it an icon,  
> and set the type to Editor or Viewer as appropriate.
>
> UTIs are a little more involved, and require you to edit the  
> Info.plist.  Find the Info.plist in your source files, right-click  
> on it, and choose to open it as a plain-text file.  You'll need to  
> add XML to export your UTI definition similar to the following:
>
> 	<key>UTExportedTypeDeclarations</key>
> 	<array>
> 		<dict>
> 			<key>UTTypeConformsTo</key>
> 			<array>
> 				<string>public.xml</string>
> 			</array>
> 			<key>UTTypeDescription</key>
> 			<string>SonoPlot's proprietary XML pattern file type</string>
> 			<key>UTTypeIdentifier</key>
> 			<string>com.sonoplot.pattern</string>
> 			<key>UTTypeTagSpecification</key>
> 			<dict>
> 				<key>public.filename-extension</key>
> 				<array>
> 					<string>pattern</string>
> 				</array>
> 			</dict>
> 		</dict>
> 	</array>
>
> This example is for our custom XML-based file format.  Repeat the  
> same steps as for setting up a new file extension type, only this  
> time fill in the UTI using the one you exported in your Info.plist.   
> Unfortunately, UTIs don't always work the way you want, such as when  
> another application on your system has claimed the same file  
> extension as your application.
>
> Finally, you'll want to call the DKDrawingDocument class methods  
> bindFileExportType:toSelector: and bindFileImportType:toSelector: to  
> associate your file loading and saving methods from your custom  
> category with the new filetype or UTI.  For example, I do
>
> NSString*		kSPPatternDocumentType = @"Pattern";
> NSString*		kSPPatternDocumentUTI = @"com.sonoplot.pattern";
>
> [[self class] bindFileExportType:kSPPatternDocumentType  
> toSelector:@selector(dataForPattern)];
> [[self class] bindFileExportType:kSPPatternDocumentUTI  
> toSelector:@selector(dataForPattern)];
> [[self class] bindFileImportType:kSPPatternDocumentType  
> toSelector:@selector(drawingWithPattern:)];
> [[self class] bindFileImportType:kSPPatternDocumentUTI  
> toSelector:@selector(drawingWithPattern:)];
>
> in my document's init: method.  I'm going to move that out of there,  
> because it only needs to be called once on the start of the program,  
> not with each new document.
>
> For a working example of this, I direct you to the code for the beta  
> of SonoDraw that we have out there.  I posted this earlier, but I  
> can repeat:
>
> The source code is available for download from
> http://www.sonoplot.com/sites/default/files/SonoDraw/SonoDrawBeta1.zip
> and a compiled binary can be downloaded from
> http://www.sonoplot.com/sites/default/files/SonoDraw/SonoDrawBeta1-Binary.zip
>
> Example .pattern files that you can load with the software are also  
> available at
> http://www.sonoplot.com/sites/default/files/SonoDraw/ 
> SamplePatterns.zip
>
> I'm getting close to releasing the final version of this, and I'll  
> be sure to post that when it's done.
> ______________________
> Brad Larson
> SonoPlot, Inc.
> 3030 Laura Lane, Suite 120
> Middleton, WI 53562
>
>
>
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