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如何下载并保存文档中的xml，然后如何从文档中解析xml文件？

发布于 2024-09-08 03:38:44 字数 83 浏览 2 评论 0原文

在我的应用程序中，我必须解析从互联网下载的 xml 文件。如何下载此 xml 并保存在 iPhone 上的文档中？那么我如何开始解析文档中保存的XML？

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朮生 2024-09-15 03:38:44

你的意思是这样的

NSString *URLString = @"http://www.example.com/XML/note.xml";
NSURL *URL = [NSURL URLWithString:
              [URLString stringByAddingPercentEscapesUsingEncoding:
               NSASCIIStringEncoding]];


NSData *dataXML = [NSData dataWithContentsOfURL:URL];

NSString *applicationDocumentsDir = 
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *storePath = [applicationDocumentsDir stringByAppendingPathComponent:@"sample.xml"];
[dataXML writeToFile:storePath atomically:TRUE];
    NSData *contenuto = [NSData dataWithContentsOfFile:storePath];
    NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:contenuto]

You mean something like that

NSString *URLString = @"http://www.example.com/XML/note.xml";
NSURL *URL = [NSURL URLWithString:
              [URLString stringByAddingPercentEscapesUsingEncoding:
               NSASCIIStringEncoding]];


NSData *dataXML = [NSData dataWithContentsOfURL:URL];

NSString *applicationDocumentsDir = 
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *storePath = [applicationDocumentsDir stringByAppendingPathComponent:@"sample.xml"];
[dataXML writeToFile:storePath atomically:TRUE];
    NSData *contenuto = [NSData dataWithContentsOfFile:storePath];
    NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:contenuto]

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爱要勇敢去追 2024-09-15 03:38:44

第一次加载时将内容下载到 NSData 对象中。其中之一将其保存到磁盘

– writeToFile:atomically:
– writeToFile:options:error:

使用NSData 类参考中描述的： http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/ NSData_Class/Reference/Reference.html#//apple_ref/occ/instm/NSData/writeToFile:atomically：

当你想从磁盘加载时，使用[NSData dataWithContentsOfFile:]加载再次将其转换为 NSData 对象。

至于将 NSData 解析为 XML，请查看这个非常非常常见的问题的其他答案，例如 How do我在 Objective-C 中解析包含 XML 的 NSString？

Download the contents to an NSData object when it's loaded for the first time. Save it to disk using either one of

– writeToFile:atomically:
– writeToFile:options:error:

Which are described in the NSData class reference here: http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/Reference/Reference.html#//apple_ref/occ/instm/NSData/writeToFile:atomically:

When you want to load it from disk, use [NSData dataWithContentsOfFile:] to load it into an NSData object again.

As for parsing NSData into XML, look into other answers to this very, very common question, e.g. How do I parse an NSString containing XML in Objective-C?

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