http://www.2cto.com/kf/201402/281501.html
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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);
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// 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;
} |
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//int 转dataint i = 1;
NSData *data = [NSData dataWithBytes: &i length: sizeof(i)]; //data 转intint i;
[data getBytes: &i length: sizeof(i)]; |