在 Objective C 中将 NSMutableString 转换为 NSUrl

发布于 2024-10-18 00:31:53 字数 1458 浏览 13 评论 0原文

实际上，我在从 Objective-C 中的动态 url 解析 xml 文件时遇到了一个问题。解析器对于整个项目来说工作得很好，但现在我必须设置一个动态 URL 来解析所需的 XML 文件。

我有两个变量：一个用于 BaseURL，一个用于 Params。这是我记录的代码：

    //The Baseurl
NSMutableString* baselink = [NSMutableString stringWithString:zimmertyp.typlink];   

//Adds the params to URL
[baselink appendString:aSlice.link];

//In Log it shows the right url to my XML-File with params
NSLog(@"Selected-URL: %@", url);

//I tried to convert the String to NSURL here
NSURL *url = [NSURL URLWithString: baselink];


NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
self.navigationItem.prompt = @" ";

//Initialize the delegate.
XMLParser *parser = [[XMLParser alloc] initXMLParser];

//Set delegate
[xmlParser setDelegate:parser];

//Start parsing the XML file.
BOOL success = [xmlParser parse];

if(success)
    NSLog(@"No Errors");
else
    NSLog(@"Error Error Error!!!");

每次解析器尝试遍历时，我都会得到：

2011-02-16 16:40:03.371 Project[15566:207] Selected-URL: http://xml.projectwebsite.de/price/doppelzimmer.xml
    ?Zimmertyp=Doppelzimmer+Classic
2011-02-16 16:40:03.373 Project[15566:207] Error Error Error!!!
2011-02-16 16:40:03.374 Project[15566:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString stringByAppendingString:]: nil argument'

NSUrl 似乎是空的，还是我错了？当解析器使用 url 初始化时，应用程序崩溃了。

谁能告诉我我有什么错吗？

问候语, 扎拉卡斯

原文

I actually stuck with a problem while parsing xml-file from a dynamic url in Objective-C.
The Parser works fine for the whole project, but now I have to set a dynamic URL to parse the needed XML-File.

I have two Variables: One for the BaseURL and one for the Params.
Here is my documented Code:

    //The Baseurl
NSMutableString* baselink = [NSMutableString stringWithString:zimmertyp.typlink];   

//Adds the params to URL
[baselink appendString:aSlice.link];

//In Log it shows the right url to my XML-File with params
NSLog(@"Selected-URL: %@", url);

//I tried to convert the String to NSURL here
NSURL *url = [NSURL URLWithString: baselink];


NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
self.navigationItem.prompt = @" ";

//Initialize the delegate.
XMLParser *parser = [[XMLParser alloc] initXMLParser];

//Set delegate
[xmlParser setDelegate:parser];

//Start parsing the XML file.
BOOL success = [xmlParser parse];

if(success)
    NSLog(@"No Errors");
else
    NSLog(@"Error Error Error!!!");

Everytime the Parser tries to walk through, I get:

2011-02-16 16:40:03.371 Project[15566:207] Selected-URL: http://xml.projectwebsite.de/price/doppelzimmer.xml
    ?Zimmertyp=Doppelzimmer+Classic
2011-02-16 16:40:03.373 Project[15566:207] Error Error Error!!!
2011-02-16 16:40:03.374 Project[15566:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString stringByAppendingString:]: nil argument'

It seems like the NSUrl is empty, or am I wrong?
The App crashes right at the point when the Parser initialized with the url.

Can anyone tell me what's my fault?

greeting,
Zarakas

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