编码URL的字符串参数

时间:2009-08-09 00:04:47

标签: objective-c cocoa

我创建了一种为我构建网址的方法。

- (NSString *)urlFor:(NSString *)path arguments:(NSDictionary *)args
{
    NSString *format = @"http://api.example.com/%@?version=2.0.1";
    NSMutableString *url = [NSMutableString stringWithFormat:format, path];

    if ([args isKindOfClass:[NSDictionary class]]) {
        for (NSString *key in args) {
            [url appendString:[NSString stringWithFormat:@"&%@=%@", key, [args objectForKey:key]]];
        }
    }

    return url;
}

当我尝试构建如下所示的内容时,URL当然不会被编码。

NSDictionary *args = [NSDictionary dictionaryWithObjectsAndKeys:
                            @"http://other.com", @"url",
                            @"ABCDEF", @"apiKey", nil];

NSLog(@"%@", [self urlFor:@"articles" arguments:args]);`

返回值 http://api.example.com/articles?version=2.0.1&url=http://other.com&apiKey=ABCDEF 时应为 http://api.example.com/articles?version=2.0.1&url=http%3A%2F%2Fother.com&apiKey=ABCDEF

我需要对键和值进行编码。我搜索了一些东西,发现了 CFURLCreateStringByAddingPercentEscapes stringByAddingPercentEscapesUsingEncoding ,但我没有做过任何测试。

我该怎么做?

3 个答案:

答案 0 :(得分:3)

IIRC,当它们位于URL的查询部分时,应正确解释斜杠。您是否测试过它是否仍然可以在没有编码减少的情况下工作?否则,请执行以下操作:

if ([args isKindOfClass:[NSDictionary class]]) {
        for (NSString *key in [args allKeys]) {
            NSString *value = [(NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)[args objectForKey:key], NULL, CFSTR("/?&:=#"), kCFStringEncodingUTF8) autorelease];
            [url appendString:[NSString stringWithFormat:@"&%@=%@", key, value]];
            [value release];
        }
}

return url;

注意CFURLCreateStringByAddingPercentEscapes的第四个参数的值。

答案 1 :(得分:1)

您应该考虑使用Google Toolbox for Mac's GTMNSString+URLArguments;它的设计正是为了这个目的。

答案 2 :(得分:0)

我推荐我们的KSFileUtilities课程。那么你的例子就是:

- (NSString *)urlFor:(NSString *)path arguments:(NSDictionary *)args
{
    NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithDictionary:args];
    [parameters setObject:@"2.0.1" forKey:@"version"];

    NSURL *result = [NSURL ks_URLWithScheme:@"http"
                                       host:@"api.example.com"
                                       path:path
                            queryParameters:parameters;

    return [result absoluteString];
}