如何先保存粘贴板内容，然后恢复？ [英] How to save off the pasteboard contents first and restore them afterward?

问题描述

我有一个匿名的Mac OS X应用程序，需要从其他应用程序复制选择。我通过模拟CMD + C键击实现这一点。它工作完美。
但是有一个，我觉得很关键，副作用。它会覆盖用户的粘贴板没有他们的权限。
所以我在想我之前复制选择我应该保存粘贴板内容，然后恢复。有人可以给我一些提示，也许示例代码？

I have a faceless Mac OS X app which needs to copy selection from other apps. I achieve this by simulating CMD+C keystrokes. It works perfectly. But there is a, I think it's critical, side effect. It'll override users' pasteboard without their permission. So I was thinking before I copying selection I should save pasteboard content and then restore it. Can someone give me some hint, maybe sample code?

推荐答案

这是一个类别 NSPasteboard

@implementation NSPasteboard (SaveAndRestore)

// save current contents as an array of pasteboard items
- (NSArray *)save
{
    NSMutableArray *archive=[NSMutableArray array];
    for (NSPasteboardItem *item in [self pasteboardItems]) 
    {
        NSPasteboardItem *archivedItem=[[NSPasteboardItem alloc] init];
        for (NSString *type in [item types])
        {
            /* The mutableCopy performs a deep copy of the data. This avoids
               memory leak issues (bug in Cocoa?), which you might run into if
               you don't copy the data. */
            NSData *data=[[item dataForType:type] mutableCopy];
            if (data) { // nil safety check
                [archivedItem setData:data forType:type];
            }
        }
        [archive addObject:archivedItem];
    }
    return archive;
}

// restore previously saved data
- (void)restore:(NSArray *)archive
{
    [self clearContents];
    [self writeObjects:archive];
}

@end

这篇关于如何先保存粘贴板内容，然后恢复？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！