How to drag and drop an image file to find in an app

import Cocoa

@available(macOS 10.13, *)
let imagePboardType = NSPasteboard.PasteboardType.fileURL

class DragSourceView: NSImageView {
    weak var dragSourceDelegate: NSDraggingSource?
    override func mouseDown(with event: NSEvent) {
        
        //拖放数据定义
        let pasteboardItem = NSPasteboardItem()
        //设置数据的Provider
        if #available(macOS 10.13, *) {
            pasteboardItem.setDataProvider(self, forTypes: [NSPasteboard.PasteboardType.fileURL])
        } else {
            // Fallback on earlier versions
        }
        
        //拖放item
        let draggingItem = NSDraggingItem(pasteboardWriter: pasteboardItem)
        draggingItem.draggingFrame = NSRect(x: 100 , y: 10, width: 100, height: 100)
        
        //拖放可视化图象设置
        draggingItem.imageComponentsProvider = {
        
            let component = NSDraggingImageComponent(key: NSDraggingItem.ImageComponentKey.icon)
        
            component.frame = NSRect(x: 0, y: 0, width: 16, height: 16)
            component.contents = NSImage(size: NSSize(width: 32,height: 32), flipped: false, drawingHandler: { [unowned self]  rect in {
                
                       self.image?.draw(in: rect)
                
                       return true
                }()
                }
            )
            return [component]
        }
        //开始启动拖放sesson
        self.beginDraggingSession(with: [draggingItem], event: event, source: self.dragSourceDelegate!)
    }
}


extension DragSourceView: NSPasteboardItemDataProvider {
    func pasteboard(_ pasteboard: NSPasteboard?, item: NSPasteboardItem, provideDataForType type: NSPasteboard.PasteboardType) {
    
//        let data = self.image?.tiffRepresentation
        let data = "/Users/slowdony/Desktop/640.jpeg"
        let dataUrl = data.data(using: String.Encoding(rawValue: NSUTF8StringEncoding))!
        item.setData(dataUrl, forType: type)
    }
}

import Cocoa


class ViewController: NSViewController {
    @IBOutlet weak var sourceView: DragSourceView!
    override func viewDidLoad() {
        super.viewDidLoad()
        self.sourceView.dragSourceDelegate = self
    }
}

extension ViewController: NSDraggingSource {
    
    //返回拖放操作类型
    func draggingSession(_ session: NSDraggingSession, sourceOperationMaskFor context: NSDraggingContext) -> NSDragOperation {
        if (context == .outsideApplication){
            return .copy
        }
        else{
            return .generic
        }
    }
    
    //开始拖放代理回调
    func draggingSession(_ session: NSDraggingSession, willBeginAt screenPoint: NSPoint) {
        print("draggingSession beginAt \(screenPoint)")
    }
    
    //拖放鼠标移动时的代理回调
    func draggingSession(_ session: NSDraggingSession, movedTo screenPoint: NSPoint) {
        print("draggingSession movedTo \(screenPoint)")
    }
    
    //结束拖放代理回调
    func draggingSession(_ session: NSDraggingSession, endedAt screenPoint: NSPoint, operation: NSDragOperation) {
        print("draggingSession endedAt \(screenPoint)")
    }
}

I am dragging an image to the desktop through the above code, failed, help