NSURL URLWithString:myString返回Nil吗?

问题描述

我有一个URL字符串.我想从该URL获取数据.为此，我需要创建NSURL的对象.问题是，当我尝试NSURL类的URLWithString方法时，它返回nil.但是，当我在Mac的Safari中打开此链接时，它将向我显示图像.

I have a string of my url.. I want to get data from that url. For that I needs to create object of NSURL. The problem is while I try URLWithString method of NSURL class it returns nil. But when I opens this link in Safari of My Mac it display me the Image.

我正在使用..

NSString *str = @"http://chart.apis.google.com/chart?chs=150x150&cht=qr&chld=L|0&chl=http://MyServer.com/shareMyCard.php?value=1304057103";
NSURL *url = [NSURL URLWithString:str];
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [UIImage imageWithData:data];

我不知道为什么URL为Nil.我认为是因为我的字符串中有查询字符串.

I don't know why the URL is Nil. I think because of query string in my string.

任何想法如何从此网址字符串获取数据.

Any Idea how to get data from this Url String.

谢谢

推荐答案

您的URL为零，因为它包含特殊字符，请使用以下函数对您的url参数进行编码，然后再在URL中使用它们-

Your URL is nil because it contains special chars, use this following function to encode your url parameters before using them in URL -

-(NSString *) URLEncodeString:(NSString *) str
{

    NSMutableString *tempStr = [NSMutableString stringWithString:str];
    [tempStr replaceOccurrencesOfString:@" " withString:@"+" options:NSCaseInsensitiveSearch range:NSMakeRange(0, [tempStr length])];


    return [[NSString stringWithFormat:@"%@",tempStr] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}

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