在 macos 上使用 pyobjc 将 MPEG-4 注册为拖动类型

Question

我正在尝试使用 pyobjc 将 MPEG-4 注册为拖动类型，具体目标是能够将语音备忘录直接从应用程序拖到我自己的 python 应用程序中。

我尝试按照苹果官方文档注册UTI类型“public.audio”、“public.mpeg-4-audio”、NSPasteboard.URLType和NSPasteboard.fileURLType。然而，在我的程序上删除文件总是会导致相同的错误：“无法打开文档 x。Python 无法打开“Apple MPEG-4 音频”格式的文件。

这是一个最小的可重现示例：

from AppKit import NSApplication, NSObject, NSDragOperationCopy, NSWindow, NSView, NSPasteboard, NSPasteboard
from PyObjCTools import AppHelper

class DropView(NSView):
    def initWithFrame_(self, frame):
        self = super(DropView, self).initWithFrame_(frame)
        if self:
            self.registerForDraggedTypes_(["public.audio", "public.mpeg-4-audio", NSPasteboard.URLType, NSPasteboard.fileURLType])
        return self

    def draggingEntered_(self, sender):
        pboard = sender.draggingPasteboard()
        return NSDragOperationCopy

    def performDragOperation_(self, sender):
        pboard = sender.draggingPasteboard()
        print(pboard)
        return True

class AppDelegate(NSObject):
    def applicationDidFinishLaunching_(self, notification):
        self.window = NSWindow.alloc().initWithContentRect_styleMask_backing_defer_(((100, 100), (400, 300)), 1 << 1 | 1 << 10, 2, False)
        self.window.setTitle_("Drag-and-Drop Example")

        drop_view = DropView.alloc().initWithFrame_(((0, 0), (400, 300)))
        self.window.contentView().addSubview_(drop_view)

        self.window.makeKeyAndOrderFront_(None)

def run_app():
    app = NSApplication.sharedApplication()
    delegate = AppDelegate.alloc().init()
    app.setDelegate_(delegate)

    AppHelper.runEventLoop()

if __name__ == '__main__':
    run_app()

Answer 1

以下源代码在我的系统（MacOS，Sonoma 14.4.1）上运行。我无法运行您在 Thonny 中发布的代码。更改了 registerForDraggedTypes() 的最后两个参数以及 objc 导入；它现在返回文件路径。您仍然需要添加 AVPlayer 才能听到删除的文件。

from Cocoa import (
    NSApplication,
    NSObject,
    NSDragOperationCopy,
    NSWindow,
    NSView,
    NSPasteboard,
    NSPasteboard,
    NSPasteboard,
    NSDragOperationCopy,
    NSPasteboardType,
    NSPasteboardTypeURL,
    NSPasteboardTypeFileURL,
    NSBezelStyleCircular,
    NSFilenamesPboardType,
)
from PyObjCTools import AppHelper
from objc import super

class DropView(NSView):
    def initWithFrame_(self, frame):
        self = super(DropView, self).initWithFrame_(frame)
        if self:
            self.registerForDraggedTypes_(
                [
                    "public.audio",
                    "public.mpeg-4-audio",
                    NSPasteboardTypeURL,
                    NSPasteboardTypeFileURL,
                ]
            )
        return self

    def draggingEntered_(self, sender):
        pboard = sender.draggingPasteboard()
        print("dragging entered.")
        print(pboard)
        return NSDragOperationCopy

    def performDragOperation_(self, sender):
        pboard = sender.draggingPasteboard()
        files = pboard.propertyListForType_(NSFilenamesPboardType)
        print(files.objectAtIndex_(0))
        return True


class AppDelegate(NSObject):
    def applicationDidFinishLaunching_(self, notification):
        self.window = NSWindow.alloc().initWithContentRect_styleMask_backing_defer_(
            ((100, 100), (400, 300)), 1 << 1 | 1 << 10, 2, False
        )
        self.window.setTitle_("Drag-and-Drop Example")
        drop_view = DropView.alloc().initWithFrame_(((0, 0), (400, 300)))
        self.window.contentView().addSubview_(drop_view)
        self.window.makeKeyAndOrderFront_(None)


def run_app():
    app = NSApplication.sharedApplication()
    delegate = AppDelegate.alloc().init()
    app.setDelegate_(delegate)

    AppHelper.runEventLoop()


if __name__ == "__main__":
    run_app()