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oc的方法 - (instancetype)initWithBytes:(const void *)bytes length:(NSUInteger)length;
char* name[100]; // declaring char array
NSString* firstName; // declaring the NSString
firstName = [NSString stringWithCString:name encoding:NSASCIIStringEncoding];
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
NSData*d = [[NSData alloc] initWithBytes:"\xb3\xac\xbc\xb6\xb9\xdc\xc0\xed" length:8];
NSString *s = [[NSString alloc] initWithData:d encoding:enc];
NSLog(@"%@", s);