GB2312和UTF8编码的转化

//转成utf8Data
- (NSData *)UTF8WithGB2312Data:(NSData *)gb2312Data{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSString *str = [[NSString alloc] initWithData:gb2312Data encoding:enc];
    NSData *utf8Data = [str dataUsingEncoding:NSUTF8StringEncoding];
    return utf8Data;
            
}

//转成gb2312Data
-(NSData *)GB2312WithUTF8Data:(NSData *)UTF8Data{
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
    NSString *str = [[NSString alloc] initWithData:UTF8Data  encoding:NSUTF8StringEncoding];
    NSData *gb2312Data = [str dataUsingEncoding:enc ];
    return gb2312Data;

}