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十年磨一“饼” 一个70后连续创业者的心路历程 - 资讯 - 清泛网 - 专注C/C+...
...欣然以超千万的估值投资了“货元甲”。2个月后，另一位浙商，长江商学院七期、资深茶文化投资人及杭州丝里伯睡眠科技有限公司创始股东张烨飞先生跟投了“货元甲”。这是缘分也是信任，没有收条、没有合约，就是这么...
How can I get a precise time, for example in milliseconds in Objective-C?
...e is a weird conversion - last line of the first example is "return * (uint64_t *) &elapsedNano;" why not just "return (uint64_t)elapsedNano" ?
– Tyler
Dec 29 '10 at 23:00
8
...
Python Pandas: Get index of rows which column matches certain value
... index,
In [56]: idx = df.index[df['BoolCol']]
In [57]: idx
Out[57]: Int64Index([10, 40, 50], dtype='int64')
then you can select the rows using loc instead of iloc:
In [58]: df.loc[idx]
Out[58]:
BoolCol
10 True
40 True
50 True
[3 rows x 1 columns]
Note that loc can also accep...
How to determine CPU and memory consumption from inside a process?
...ct statfs stats;
if (0 == statfs("/", &stats))
{
myFreeSwap = (uint64_t)stats.f_bsize * stats.f_bfree;
}
Total Virtual Currently Used
Calling systcl with the "vm.swapusage" key provides interesting information about swap usage:
sysctl -n vm.swapusage
vm.swapusage: total = 3072.00M used ...
Unable to load DLL (Module could not be found HRESULT: 0x8007007E)
...
Current Directory
System folder, C:\windows\system32 or c:\windows\SysWOW64 (for 32-bit process on 64-bit box).
Reading from the Path environment variable
In addition I'd check the dependencies of the DLL, the dependency walker provided with Visual Studio can help you out here, it can also be do...
Setting Authorization Header of HttpClient
...
@Red fyi, the second parameter is the base64 encoded user:password (its not encrypted).
– n00b
Aug 1 '17 at 19:11
5
...
How to detect if app is being built for device or simulator in Swift
...ct iOS on a desktop architecture like follows
#if (arch(i386) || arch(x86_64)) && os(iOS)
...
#endif
After Swift 4.1 version
Latest use, now directly for all in one condition for all types of simulators need to apply only one condition -
#if targetEnvironment(simulator)
// y...
What is the difference between “int” and “uint” / “long” and “ulong”?
I know about int and long (32-bit and 64-bit numbers), but what are uint and ulong ?
5 Answers
...
Fastest way to determine if an integer's square root is an integer
...so answer yes for 0. (In reading the code below, note that my input is int64 x.)
if( x < 0 || (x&2) || ((x & 7) == 5) || ((x & 11) == 8) )
return false;
if( x == 0 )
return true;
Next, check if it's a square modulo 255 = 3 * 5 * 17. Because that's a product of three distin...
Simplest two-way encryption using PHP
...nary expected)
* @param boolean $encode - set to TRUE to return a base64-encoded
* @return string (raw binary)
*/
public static function encrypt($message, $key, $encode = false)
{
$nonceSize = openssl_cipher_iv_length(self::METHOD);
$nonce = openssl_random_pse...