ios文字转为16进制

原文链接

NSString *str = @"0xff055008";//先以16为参数告诉strtoul字符串参数表示16进制数字，然后使用0x%X转为数字类型unsigned long red = strtoul([str UTF8String],0,16);//strtoul如果传入的字符开头是“0x”,那么第三个参数是0，也是会转为十六进制的,这样写也可以：unsigned long red = strtoul([@"0x6587" UTF8String],0,0);NSLog(@"转换完的数字为：%lx",red);

十六进制转换为普通字符串的。

+ (NSString *)stringFromHexString:(NSString *)hexString { //     char *myBuffer = (char *)malloc((int)[hexString length] / 2 + 1);     bzero(myBuffer, [hexString length] / 2 + 1);     for (int i = 0; i < [hexString length] - 1; i += 2) {         unsigned int anInt;         NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)];         NSScanner * scanner = [[[NSScanner alloc] initWithString:hexCharStr] autorelease];         [scanner scanHexInt:&anInt];         myBuffer[i / 2] = (char)anInt;     }     NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4];     NSLog(@"------字符串=======%@",unicodeString);     return unicodeString; } 

普通字符串转换为十六进制的。

+ (NSString *)hexStringFromString:(NSString *)string{     NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];     Byte *bytes = (Byte *)[myD bytes];     //下面是Byte 转换为16进制。     NSString *hexStr=@"";     for(int i=0;i<[myD length];i++)         {     NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数     if([newHexStr length]==1) {        hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];     } else {        hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];     }     return hexStr; }

int 转data

int i = 1; NSData *data = [NSData dataWithBytes: &i length: sizeof(i)]; 

data 转int

int i; [data getBytes: &i length: sizeof(i)];