- (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;
}
简洁版
- (NSString *)getHexStringForData:(NSData *)data{
NSUInteger len = [data length];
char *chars = (char *)[data bytes];
NSMutableString *hexString = [[NSMutableString alloc] init];
for (NSUInteger i = 0; i < len; i++) {
[hexString appendString:[NSString stringWithFormat:@"%0.2hhx", chars[i]]];
}
return hexString;
}
