Question

NSFilenamesPboardType已于10.14弃用，建议使用NSPasteboardTypeFileURL。这给我的文件名是

file：///..file/id=6571367.12885025918

和NSWorkspace无法从其中获取UTI。

如何从NSPasteboardTypeFileURL获取UTI？

旧代码：

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    NSDragOperation sourceDragMask = [sender draggingSourceOperationMask];
    NSDragOperation resultingDragMask = NSDragOperationNone;
    NSPasteboard *pboard = [sender draggingPasteboard];

    if ([[pboard types] containsObject:NSFilenamesPboardType]) {
        NSArray <NSString *>*list = [pboard propertyListForType:NSFilenamesPboardType];
        NSString *firstItem = [list objectAtIndexedSubscript:0];
        NSError *error;
        NSString *UTI = [[NSWorkspace sharedWorkspace] typeOfFile:firstItem error:&error];
        if (!error) {
            if ([[NSImage imageTypes] containsObject:UTI]) {
                resultingDragMask = NSDragOperationCopy;
            }
        }

    } else if ([[pboard types] containsObject:NSPasteboardTypeTIFF]) {
        resultingDragMask = NSDragOperationCopy;
    }

    if (sourceDragMask & NSDragOperationCopy && resultingDragMask & NSDragOperationCopy) {
        return NSDragOperationCopy;
    }
    return NSDragOperationNone;
}

使用NSPasteboardTypeFileURL时出现错误，指出状态文件不存在。从粘贴板拖拽：

打印错误说明：错误域= NSCocoaErrorDomain代码= 260“文件“ id = 6571367.12885025918”无法打开，因为没有这样的文件文件。” UserInfo = {NSURL = file：/。file / id = 6571367.12885025918- 文件：///Users/xxx/Library/Containers/com.xxx.imageviewfix/Data/， NSFilePath = /用户/ xxx /库/容器/com.xxx.imageviewfix/数据/文件：/。file / id = 6571367.12885025918， NSUnderlyingError = 0x600000c70d80 {Error Domain = NSPOSIXErrorDomain 代码= 2“没有这样的文件或目录”}}

Answer 1

这个问题我来晚了，但是我发现这可行：

  NSArray<Class> *classes = @[[NSURL class]];
  NSDictionary *options = @{};
  NSArray<NSURL*> *files = [pboard readObjectsForClasses:classes options:options];

  for (NSURL *url in files)
  {
     NSString *str = [url path];

     // TODO: do something with str.
  }

与其他答案不同，使用此方法可以删除多个文件。

Answer 2

获取NSURL对象的路径将获取原始文件名。唯一缺少的是NSString *fileURL = [[NSURL URLFromPasteboard:pboard] path];曾经提供的文件路径数组。

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    NSDragOperation sourceDragMask = [sender draggingSourceOperationMask];
    NSDragOperation resultingDragMask = NSDragOperationNone;
    NSPasteboard *pboard = [sender draggingPasteboard];

    if ([[pboard types] containsObject:NSPasteboardTypeFileURL]) {
        NSString *fileURL = [[NSURL URLFromPasteboard:pboard] path];
        NSError *error;
        NSString *UTI = [[NSWorkspace sharedWorkspace] typeOfFile:fileURL error:&error];
        if (!error) {
            if ([[NSImage imageTypes] containsObject:UTI]) {
                resultingDragMask = NSDragOperationCopy;
            }
        }

    } else if ([[pboard types] containsObject:NSPasteboardTypeTIFF]) {
        resultingDragMask = NSDragOperationCopy;
    }

    if (sourceDragMask & NSDragOperationCopy && resultingDragMask & NSDragOperationCopy) {
        return NSDragOperationCopy;
    }
    return NSDragOperationNone;
}

更新的代码：

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获取NSPasteboardTypeFileURL

2 个答案: