Re: Difficulties with recovering NSAttributedString attachments from saved RTFD
Re: Difficulties with recovering NSAttributedString attachments from saved RTFD
- Subject: Re: Difficulties with recovering NSAttributedString attachments from saved RTFD
- From: "Gary L. Wade via Cocoa-dev" <email@hidden>
- Date: Wed, 27 Nov 2019 11:35:55 -0800
You want to use a file wrapper rather than data and specify the document type
in the attributes as RTFD.
--
Gary L. Wade
http://www.garywade.com/ <http://www.garywade.com/>
> On Nov 27, 2019, at 10:18 AM, Jeff Younker via Cocoa-dev
> <email@hidden> wrote:
>
> I am having some difficulty with saving NSAttributedStrings as RTFD and
> then recovering
> them with attachments intact. I generate a string containing an attachment
> and turn that into
> RTFD. When I turn that RTFD back into an NSAttributedString, I get the
> .string back, and I
> get an attachment, but the attachment's .contents is empty.
>
> This is the smallest example I can come up with:
>
> func testSaveAndRestoreAttachment() {
> // Build up the string "deadbeef<attachment foobar>deadbeef"
> let originalContent = "foobar".data(using: .utf8)
> let originalAttachment = NSTextAttachment(
> data: originalContent, ofType: "public.plain-text")
> let originalString = NSMutableAttributedString(string: "deadbeef")
> originalString.append(NSMutableAttributedString(attachment:
> originalAttachment))
> originalString.append(NSMutableAttributedString(string: "deadbeef")
>
> // save string as RTFD (note that generated RTFD contains "foobar"
> inside.)
> let savedRtfd = originalString.rtfd(from:
> NSRange(0..<originalString.length))!
>
> // Recover string
> let recoveredString = NSAttributedString(rtfd: savedRtfd,
> documentAttributes: nil)!
> // Implementation of attachments() can be found below.
> let recoveredAttachments = attachments(from: recoveredString)
> // There *is* an attachment!
> let recoveredAttachment = recoveredAttachments[0]
> // Want to get Data("foobar") but actually get nil :(
> XCTAssertNotNil(recoveredAttachment.contents)
> }
>
> When I print out the RTFD I can see the document includes the attachment
> "foobar".
>
> I'm assuming that I need to pass some additional information when I
> call NSAttributedString(rtfd:,
> documentAttributes:)
> but I'm at a loss here.
>
> Am I missing something simple? Perhaps a magical setting to be passed in
> documentAttributes?
>
> -jeff
>
>
>
> ** This is the attachments() function used above:
>
> func attachments(from s: NSAttributedString) -> Array<NSTextAttachment> {
> var attachments: Array<NSTextAttachment> = []
> s.enumerateAttribute(.attachment, in: NSRange(0..<s.length)) {
> value, range, stop in
> guard let a = value else {
> return
> }
> attachments.append(a as! NSTextAttachment)
> }
> return attachments
> }
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