Cocoa / Objective-C：解析XML文档的最佳实践？ [英] Cocoa/Objective-C : Best Practice to parse XML Document?

问题描述

我从来没有使用XML在Cocoa之前，所以我不知道从哪里开始。
现在我需要将一个XML文件（从硬盘）解析成一个对象或者甚至一个对象数组。

I never worked with XML in Cocoa before so I have no idea where to begin. Right now I need to parse a XML File (from Hard disc) into an object or even an Array of objects.

我的XML看起来像这样

My XML looks like this

<Person>
   <FirstName>
   <LastName>
   etc...
</Person>
<Person>
...

$ b $ p在我的项目中，我已经有一个Person类具有必需的属性。从这种XML文件创建对象的最佳做法是什么？

In my project I already have a Person class with a required properties. What is the best practice to create objects from such XML file?

推荐答案

希望这有助于。

请参阅：

http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/ XMLParsing / Articles / UsingParser.html＃// apple_ref / doc / uid / 20002264-BCIIJEEH

打开文件：

- (void)openXMLFile {
    NSArray *fileTypes = [NSArray arrayWithObject:@"xml"];
    NSOpenPanel *oPanel = [NSOpenPanel openPanel];

    NSString *startingDir = [[NSUserDefaults standardUserDefaults] objectForKey:@"StartingDirectory"];
    if (!startingDir)
        startingDir = NSHomeDirectory();

    [oPanel setAllowsMultipleSelection:NO];
    [oPanel beginSheetForDirectory:startingDir file:nil types:fileTypes
      modalForWindow:[self window] modalDelegate:self
      didEndSelector:@selector(openPanelDidEnd:returnCode:contextInfo:)
      contextInfo:nil];
}

- (void)openPanelDidEnd:(NSOpenPanel *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo {
    NSString *pathToFile = nil;
    if (returnCode == NSOKButton) {
        pathToFile = [[[sheet filenames] objectAtIndex:0] copy];
    }

    if (pathToFile) {
        NSString *startingDir = [pathToFile stringByDeletingLastPathComponent];
        [[NSUserDefaults standardUserDefaults] setObject:startingDir forKey:@"StartingDirectory"];

        [self parseXMLFile:pathToFile];
    }
}

解析：

- (void)parseXMLFile:(NSString *)pathToFile {
    BOOL success;

    NSURL *xmlURL = [NSURL fileURLWithPath:pathToFile];

    if (addressParser) // addressParser is an NSXMLParser instance variable
        [addressParser release];

    addressParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
    [addressParser setDelegate:self];
    [addressParser setShouldResolveExternalEntities:YES];

    success = [addressParser parse]; // return value not used
                // if not successful, delegate is informed of error
}

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