如何在plist文件中定义统一类型标识符？ [英] How to define a Uniform Type Identifier in a plist file?

问题描述

我的应用程序使用以下 NSApplicationDelegate 函数。

My application uses the following NSApplicationDelegate function.

- (void)application:(NSApplication*)sender openFiles:(NSArray*)filenames;

我想使用此功能使用户能够拖放图像文件到码头上的应用程序图标。

I want to use this function to enable the user to drag and drop image files onto the application icon in the dock.

如何在我的 plist 文件中定义某些文件类型以限制他们成为图像？我发现结构看起来像这样。

How do I have to define certain file types in my plist file to restrict them to be images? I found out the structure has to look something like this.

// plist file contents taken from Preview.app
[...]
<key>CFBundleDocumentTypes</key>
<array>
    <dict>
        <key>CFBundleTypeIconFile</key>
        <string>jpeg.icns</string>
        <key>CFBundleTypeRole</key>
        <string>Viewer</string>
        <key>LSIsAppleDefaultForType</key>
        <true/>
        <key>LSItemContentTypes</key>
        <array>
            <string>public.jpeg</string>
        </array>
        <key>NSDocumentClass</key>
        <string>PVDocument</string>
    </dict>
</array>

我将它添加到 plist 文件中这是行不通的。弹出窗口显示以下错误消息。

I added it to the plist file but it does not work. A popup window shows the following error message.

无法打开文档test.jpg。 MyApp无法以JPEG图像格式打开文件
。

The document "test.jpg" could not be opened. MyApp cannot open files in the "JPEG image" format.

此外，我阅读 有 public.image 这将是我想要定义的。

Further, I read in the documentation that there is public.image which would be what I want to define.

同时，我发现 plist 文件只包含密钥 CFBundleDocumentTypes 如果我创建一个可可应用程序，选项创建文档 - 基于应用程序。你可以澄清选项存在什么依赖关系？

Meanwhile, I found out that the plist file only contains the key CFBundleDocumentTypes if I create a Cocoa Application with the option "Create document-based application.". Can you please clarify what dependencies exist for the option?

推荐答案

    <key>CFBundleDocumentTypes</key>
    <array>
        <dict>
            <key>CFBundleTypeExtensions</key>
            <array>
                <string>png</string>
                <string>jpg</string>
                            ... add as many types as you need
            </array>
                    ... other keys
        </dict>
    </array>

更新：Mac OS X v10.5中不推荐使用CFBundleDocumentTypes密钥。应该使用新的关键LSItemContentTypes。这些项目是UTI字符串：

Update: The CFBundleDocumentTypes key is deprecated in Mac OS X v10.5. The new key LSItemContentTypes should be used instead. The items are UTI strings:

<key>LSItemContentTypes</key>
<array>
    <string>public.png</string>
</array>

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