iOS BG2312码转字符串

-(NSString *) gb2312toutf8:(NSData *) data{

    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

    NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];

    return retStr;

}

- (NSString*)UTF8_To_GB2312:(NSString*)utf8string

{

    char *cstr = (char *)[encodeString UTF8String];

    char *cstr = "北京";

    NSString *astr = [[NSString alloc]initWithUTF8String:cstr];

    NSStringEncoding enc =CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);

    NSString *str1 = [astr stringByAddingPercentEscapesUsingEncoding:enc];

}