NSData|NSData 与 NSString 进制格式转换 NSData与NSString进制格式转换

1.NSData与NSString常规转换

NSData *data =[str dataUsingEncoding:NSUTF8StringEncoding]; NSString * str=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

2.NSData 转成十六进制格式NSString 例如：NSData实例转换成字符串形式输出0000b5be

- (NSString *)convertDataToHexStr:(NSData *)data{ if (!data || [data length] == 0) { return @""; } NSMutableString *string = [[NSMutableString alloc] initWithCapacity:[data length]]; [data enumerateByteRangesUsingBlock:^(const void *bytes, NSRange byteRange, BOOL *stop) { unsigned char *dataBytes = (unsigned char*)bytes; for (NSInteger i = 0; i < byteRange.length; i++) { NSString *hexStr = [NSString stringWithFormat:@"%x", (dataBytes[i]) & 0xff]; if ([hexStr length] == 2) { [string appendString:hexStr]; } else { [string appendFormat:@"0%@", hexStr]; } } }]; return string; }

3.十六进制格式NSString 转NSData 【NSData|NSData 与 NSString 进制格式转换】与上面2刚好相反

-(NSData*) convertBytesStringToData { NSMutableData* data = https://www.it610.com/article/[NSMutableData data]; int idx; for (idx = 0; idx+2 <= self.length; idx+=2) { NSRange range = NSMakeRange(idx, 2); NSString* hexStr = [self substringWithRange:range]; NSScanner* scanner = [NSScanner scannerWithString:hexStr]; unsigned int intValue; [scanner scanHexInt:&intValue]; [data appendBytes:&intValue length:1]; } return data; }

4.十进制格式字符转十六进制格式字符

- (NSString *)decimalToHex { long long int tmpid = [self intValue]; NSString *nLetterValue; NSString *str = @""; long long int ttmpig; for (int i = 0; i < 9; i++) { ttmpig = tmpid % 16; tmpid = tmpid / 16; switch (ttmpig) { case 10: nLetterValue = https://www.it610.com/article/@"A"; break; case 11: nLetterValue = https://www.it610.com/article/@"B"; break; case 12: nLetterValue = https://www.it610.com/article/@"C"; break; case 13: nLetterValue = https://www.it610.com/article/@"D"; break; case 14: nLetterValue = https://www.it610.com/article/@"E"; break; case 15: nLetterValue = https://www.it610.com/article/@"F"; break; default: nLetterValue = https://www.it610.com/article/[[NSString alloc]initWithFormat:@"%lli", ttmpig]; } str = [nLetterValue stringByAppendingString:str]; if (tmpid == 0) { break; } } return str; }

5.十六进制字符转十进制字符