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I integrated iink into iOS (swift app)

here is my code snippet 

            guard let editor = self.createEditor(viewSize: CGSize(width: 640, height: 480), locale: locale) else { return  }

            guard let package = self.createPackage() else { return  }

            let (events,count) = self.createStrokeEvent(strokes: strokes)

            do {

                let part = try package.createPart("Diagram")

                editor.part = part

                try editor.configuration.setBoolean(false, forKey: "diagram.enable-sub-blocks")

                editor.clear()

                try editor.pointerEvents(events, count: count, doProcessGestures: false)

                editor.waitForIdle()

                guard let rootBlock = editor.rootBlock else {

                    return completion(trans)

 }

                let supportedMimeTypes = editor.getSupportedExportMimeTypes(rootBlock)

                for type in supportedMimeTypes {

                    print("support type ==> \(self.mimeTypeName(type: type.value))")

 }

                print("number of child: \(rootBlock.children.count)")

                let imgLoader = ImageLoader()

                imgLoader.cacheFolderPath = NSTemporaryDirectory()

                imgLoader.editor = editor

                let imgDrawer = ImageDrawer()

                imgDrawer.imageLoader = imgLoader

                let rnd = Utils.generateUniq(length: 3).lowercased()

                let fn = NSTemporaryDirectory().appending("out/export_" + rnd + ".pptx")

                try editor.export_(rootBlock, toFile: fn, mimeType: IINKMimeType.PPTX, imageDrawer: imgDrawer)

// trans = try editor.export_(rootBlock, mimeType: IINKMimeType.JPEG)

1. I created "Diagram" part

2. added some raw stroke data.

3. checked supported export types 

-it shows that

support type ==> SVG

support type ==> GRAPH_ML

support type ==> JIIX

support type ==> PPTX

support type ==> MS_OFFICE_CLIP_BOARD

support type ==> JPEG

support type ==> PNG

I can SUCCESSFULLY export SVG, GRAPH_ML, JIIX.

BUT

when I try to export PPTX, it gives me following error

Error Domain=Interactive Ink SDK Error Domain Code=0 "Error, -[IINKEditor export_:toFile:mimeType:imageDrawer:error:]::536 NO_SUCH_FILE" UserInfo={NSLocalizedFailureReason=Error, -[IINKEditor export_:toFile:mimeType:imageDrawer:error:]::536 NO_SUCH_FILE}

or when I use try editor.export_(rootBlock, mimeType: IINKMimeType.JPEG) this api

it always return just "PK" string.

Can you tell me what i am missing in my code? and provide some sample code for how to export in pptx file ?

Regards

Sean

solved

the problem was in creating a folder.