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1.NSString 转换成NSData 对象
NSData* xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];
2.NSData 转换成NSString对象
NSData * data;
NSString *result = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
3.NSData 转换成char*
NSData *data;
char *test=[data bytes];
4.char* 转换成NSData对象
byte* tempData = malloc(sizeof(byte)*16);
NSData *content=[NSData dataWithBytes:tempData length:16];
5.将JSON串转化为NSDictionary或NSArray
NSError *error = nil;
id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData
options:NSJSONReadingAllowFragments
error:&error];
6.将NSDictionary或NSArray转化为JSON串
NSError *error = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:theData
options:NSJSONWritingPrettyPrinted
error:&error];
附:如果类型出现错误:便会出现这种类型的错误:
iOS中NSString,NSData和char的相互转换,JSON串转化为NSDictionary或NSArray
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原文地址:http://www.cnblogs.com/moxuexiaotong/p/4883496.html