不太了解 NSMetadataQuery

发布于 2024-11-16 02:37:13 字数 509 浏览 4 评论 0原文

我正在寻找一个可以从 Cocoa API 中使用的类来对整个系统执行 Spotlight 搜索。我查看了 NSMetadataQuery 并相信这是这个类，但是我不明白如何做到这一点；主要是NSPredicate。例如，我想在系统中搜索名为“test123.html”的文件并获取其完整路径。非常感谢示例。我的代码：

NSMetadataQuery *q = [[NSMetadataQuery alloc] init];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"kMDItemSFName == %@", @"test123456.png"];  
[q setPredicate:predicate];

[q startQuery];
while ([q isGathering]) {
    NSLog(@"%lu", [q resultCount]);
}

[q stopQuery];

这返回 0 个结果。为什么？

原文

I am looking for a class to use from the Cocoa API to perform a Spotlight search on the entire system. I looked at NSMetadataQuery and believe this is the class for this, however I don't understanding how to do this; primarily NSPredicate. I would like to search the system for a file named "test123.html" for example and get its full path. Examples are greatly appreciated. My code:

NSMetadataQuery *q = [[NSMetadataQuery alloc] init];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"kMDItemSFName == %@", @"test123456.png"];  
[q setPredicate:predicate];

[q startQuery];
while ([q isGathering]) {
    NSLog(@"%lu", [q resultCount]);
}

[q stopQuery];

This returns 0 results. Why?

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