[Iphone]urlEncoding, urlDecoding 함수

+ (NSString *)urlEncodeValue:(NSString *)str
{
NSString *result = (NSString *) CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
(CFStringRef)str,
NULL,
CFSTR(":/?#[]@!$&’()*+,;="),
kCFStringEncodingUTF8);
return [result autorelease];
}

+ (NSString *)urlDecodeString:(NSString *)str
{
NSString *result = (NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(kCFAllocatorDefault,
(CFStringRef)str,
CFSTR(""),
kCFStringEncodingUTF8);
return [result autorelease];
}