On 02/06/2009, at 11:40 AM, Matthew Jeorrett wrote:
I have successfully implemented the NSDocument architecture in my
application and have implemented saving and loading documents by
overriding the "dataOfType:error:" and "readFromData:ofType:error:"
methods. I now want to be able to export my document into a folder
selected by the user. The items I will be putting in the folder are
a few png images and a plain text file. I have created a new
package document type in the build target properties with the role
value set as none. The first gap in my knowledge is what the store
type should be?
I would guess 'binary' if you're writing out the content yourself. I'm
not sure where this setting is used, it doesn't actually seem to make
any difference.
I am guessing that I should override the fileWrapperOfType:error:
method so that if the type is "document package" I call a method to
create a directory file wrapper with the images and text files I
want instead of the default behaviour which is to create a file type
NSFileWrapper with the data from the "dataOfType:error:" method. I
assume that the save panel will have asked the user for a directory
as the document type is a package.
Yes - you override -fileWrapperOfType:error: and build your own file
wrapper with your package content.
Finally, assuming my approach so far is correct, my last problem is
I am unsure of how to add PNG images and a text file to the
wrapper. The images are stored as CGImageRefs and the text is in an
NSString.
If anyone can clear any of this or maybe even all of this up or
point me in the direction of an example I would be much obliged.
You need to first get the images/text in the form of NSData
representing the file contents. You then add these to the package
fileWrapper using the -addRegularFileWithContents:preferredFilename:
method
Here's some cut down code from my current project that writes out a
package, including Quicklook thumbnails, which is simiar to your
situation:
- (NSFileWrapper*) fileWrapperOfType:(NSString*) typeName error:
(NSError**) outError
{
NSData* mainContent = [self dataOfType:kDKDrawingDocumentType
error:outError];
if( mainContent == nil )
{
*outError = [NSError errorWithDomain:kOrteliusErrorDomain
code:kOrteliusNoDataErrorCode userInfo:nil];
return nil;
}
NSFileWrapper* fw = [[NSFileWrapper alloc]
initDirectoryWithFileWrappers:nil];
[fw addRegularFileWithContents:mainContent
preferredFilename:@"main_content"];
// add "Quick Look" preview:
NSFileWrapper* qlFolder = [[NSFileWrapper alloc]
initDirectoryWithFileWrappers:nil];
[qlFolder setPreferredFilename:@"QuickLook"];
[fw addFileWrapper:qlFolder];
[qlFolder release];
// add preview and thumbnail
NSData* preview = [[self drawing] thumbnailData];
[qlFolder addRegularFileWithContents:preview
preferredFilename:@"Thumbnail.jpg"];
if( mSavePreview )
{
preview = [[self drawing] pdf];
[qlFolder addRegularFileWithContents:preview
preferredFilename:@"Preview.pdf"];
}
return [fw autorelease];
}
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