Jarret Hardie(谢谢!)昨天发布此代码将NSinteget转换为二进制,并且工作正常,但我需要8位格式:
4 - > 00000100
修改此代码的任何想法?
// Original author Adam Rosenfield... SO Question 655792
NSInteger theNumber = 56;
NSMutableString *str = [NSMutableString string];
for(NSInteger numberCopy = theNumber; numberCopy > 0; numberCopy >>= 1)
{
// Prepend "0" or "1", depending on the bit
[str insertString:((numberCopy & 1) ? @"1" : @"0") atIndex:0];
}
NSLog(@"Binary version: %@", str);
谢谢!!!!!!
答案 0 :(得分:12)
这应该有效:
NSInteger theNumber = 56;
NSMutableString *str = [NSMutableString string];
NSInteger numberCopy = theNumber; // so you won't change your original value
for(NSInteger i = 0; i < 8 ; i++) {
// Prepend "0" or "1", depending on the bit
[str insertString:((numberCopy & 1) ? @"1" : @"0") atIndex:0];
numberCopy >>= 1;
}
NSLog(@"Binary version: %@", str);
答案 1 :(得分:5)
如果有人感兴趣,这是我的版本:
段:
NSString *NSStringWithBits(int64_t mask) {
NSMutableString *mutableStringWithBits = [NSMutableString new];
for (int8_t bitIndex = 0; bitIndex < sizeof(mask) * 8; bitIndex++) {
[mutableStringWithBits insertString:mask & 1 ? @"1" : @"0" atIndex:0];
mask >>= 1;
}
return [mutableStringWithBits copy];
}
答案 2 :(得分:3)
参考,并支持@vincent osinga的答案..这是代码,包含在一个C函数..从NSUInteger返回二进制“字符串”..完美的记录按位typedef's等< / p>
- (NSString*) bitString:(NSUInteger) mask{
NSString *str = @"";
for (NSUInteger i = 0; i < 8 ; i++) {
// Prepend "0" or "1", depending on the bit
str = [NSString stringWithFormat:@"%@%@",
mask & 1 ? @"1" : @"0", str];
mask >>= 1;
}
return str;
}
我没有认为 NSInteger numberCopy = theNumber;
是必要的,因为你没有使用指针,只是将原始值作为参数// so you won't change your original value
。这将使用as / yield结果,如...
NSEventType anEvent = NSLeftMouseUp|NSLeftMouseDown;
NSLog(@"%@, %u\n%@, %u\n%@, %u\n%@, %u",
bitString( NSScrollWheel), NSScrollWheel,
bitString( NSLeftMouseUp|NSLeftMouseDown),
NSLeftMouseUp|NSLeftMouseDown,
bitString( anEvent ), anEvent,
bitString( NSAnyEventMask ), NSAnyEventMask);
NSLOG➞
00010110, 22 /* NSScrollWheel */
00000011, 3 /* NSLeftMouseUp | NSLeftMouseDown */
00000011, 3 /* same results with typedef'ed variable */
11111111, 4294967295 /* NSAnyEventMask */