16进制字符串转化为数字：
+ (NSInteger)numberWithHexString:(NSString*)hexString{
const char *hexChar = [hexString cStringUsingEncoding:NSUTF8StringEncoding];
int hexNumber;
sscanf(hexChar,"%x", &hexNumber);
return (NSInteger)hexNumber;
}
十六进制字符串转换为二进制字符串：
+ (NSString*)getBinaryByHex:(NSString*)hex {
NSMutableDictionary *hexDic = [[NSMutableDictionary alloc] initWithCapacity:16];
[hexDicsetObject:@"0000"forKey:@"0"];
[hexDicsetObject:@"0001"forKey:@"1"];
[hexDicsetObject:@"0010"forKey:@"2"];
[hexDicsetObject:@"0011"forKey:@"3"];
[hexDicsetObject:@"0100"forKey:@"4"];
[hexDicsetObject:@"0101"forKey:@"5"];
[hexDicsetObject:@"0110"forKey:@"6"];
[hexDicsetObject:@"0111"forKey:@"7"];
[hexDicsetObject:@"1000"forKey:@"8"];
[hexDicsetObject:@"1001"forKey:@"9"];
[hexDicsetObject:@"1010"forKey:@"A"];
[hexDicsetObject:@"1011"forKey:@"B"];
[hexDicsetObject:@"1100"forKey:@"C"];
[hexDicsetObject:@"1101"forKey:@"D"];
[hexDicsetObject:@"1110"forKey:@"E"];
[hexDicsetObject:@"1111"forKey:@"F"];
NSString*binary =@"";
for(inti=0; i<[hexlength]; i++) {
NSString *key = [hex substringWithRange:NSMakeRange(i, 1)];
NSString*value = [hexDicobjectForKey:key.uppercaseString];
if(value) {
binary = [binarystringByAppendingString:value];
}
}
return binary;
}
16进制字符串转化为NSData：
-(NSData*) hexToBytes:(NSString*)str {
NSMutableData* data = [NSMutableData data];
intidx;
for(idx =0; idx+2<= str.length; idx+=2) {
NSRangerange =NSMakeRange(idx,2);
NSString* hexStr = [strsubstringWithRange:range];
NSScanner* scanner = [NSScannerscannerWithString:hexStr];
unsignedintintValue;
[scannerscanHexInt:&intValue];
[dataappendBytes:&intValuelength:1];
}
returndata;
}
