拖放 - 是否可以获取URL？ [英] Drag and Drop - Is it possible to get the URL?

问题描述

我实现了一个简单的拖放。主要目的是让用户从浏览器中拖放图像。我可以得到这个图像被拖动的URL吗？

I implemented a simple drag and drop. The main purpose is for users to drag and drop images from a browser. Is it possible for me get the URL that this image was dragged from?

所以说，我在SO和我拖放标志。有没有办法让我知道这是从 http://stackoverflow.com ？
感谢

So lets say, I am on SO and I drag and drop the logo. Is there a way for me to know that this was from http://stackoverflow.com ? Thanks

推荐答案

对于不是链接的图片，以下代码会记录一个拖动的图片从。这适用于我在Safari&火狐。

For images which aren't also links, the following code will log the URL a dragged image came from. This works for me in Safari & Firefox.

@implementation DragView

- (void)awakeFromNib {
    [self registerForDraggedTypes:[NSArray arrayWithObject:NSURLPboardType]];
}

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
    return NSDragOperationCopy;
}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender {
    NSPasteboard *pboard;    
    pboard = [sender draggingPasteboard];

    NSLog(@"types: %@", [pboard types]);
    NSLog(@"url: %@", [NSURL URLFromPasteboard:pboard]);

    return YES;
}

@end

如果图像也是链接，则记录的URL是该链接的href。还可以使用扩展属性的kMDItemWhereFroms键从文件中获取从哪里来的URL（如Finder的获取信息面板中所示）。

If the image is also a link, the logged URL is a href of that link. It's also possible to get the "where from" URL from a file (as seen in the Finder's Get Info panel) using the kMDItemWhereFroms key of the extended attributes.

这篇关于拖放 - 是否可以获取URL？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！