GDataXML更新xml数据 [英] GDataXML updating xml data

问题描述

我正在尝试更新xml文件.提出建议后，我最终选择了GdataXml. 因此，我正在尝试更新options.xml文件.

I am trying to update an xml file. After suggestion I ended up choosing GdataXml. So I am trying to update options.xml file.

原始文件

<Dat>
   <Name>Tom</Name>
   <Option>1</Option>
</Dat>

我需要将"Tom"更改为"Jim"并保存在同一文件中

I need to change "Tom" to "Jim" and save in the same file

这是我尝试的代码.

 -(void)saveToXML
{
NSString* path = [[NSBundle mainBundle] pathForResource:@"options" ofType:@"xml"];

NSData *xmlData = [[NSMutableData alloc] initWithContentsOfFile:path];
NSError *error;
GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData options:0   error:&error];

GDataXMLElement *rootElement = [GDataXMLElement elementWithName:@"Dat"];

NSArray *mySettings = [doc.rootElement elementsForName:@"Dat"];

for (GDataXMLElement *mySet in mySettings)
{
    NSString *name;
    NSArray *names = [mySet elementsForName:@"Name"];
    if (names.count > 0)
    {
        GDataXMLElement *childElement = (GDataXMLElement *) [names objectAtIndex:0];
        name = childElement.stringValue;
        NSLog(childElement.stringValue);
        [childElement setStringValue:@"Jim"];
    } 
}

[xmlData writeToFile:path atomically:YES];


}

但这不是更新options.xml文件.有人可以帮忙吗?

But this is not updating options.xml file. Can some one help on this ?

推荐答案

您正在寻找的缺少的代码行是

The missing line of code you are looking for is

NSData *xmlData = doc.XMLData;

来自 Anupdas答案，关于您的最后一个问题.您当前正在将文件读取到内存中，使用该内存初始化一个新对象，更新该新对象，然后将原始文件的内存写入新文件位置.因此，基本上，您正在读取文件，然后将同一文件写回到文件位置.

from Anupdas answer on your last question. You are currently reading a file into memory, initializing a new object using that memory, updating that new object and then writing the original file's memory into the new file location. So essentially you are reading a file and then writing the same file back to the file location.

这篇关于GDataXML更新xml数据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！