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Swift - How to convert String to Double
...String {
func doubleValue() -> Double
{
let minusAscii: UInt8 = 45
let dotAscii: UInt8 = 46
let zeroAscii: UInt8 = 48
var res = 0.0
let ascii = self.utf8
var whole = [Double]()
var current = ascii.startIndex
let negative =...
C/C++ NaN constant (literal)?
...char-sequence)",0) counterparts and NAN for assignments.
// Sample C code
uint64_t u64;
double x;
x = nan("0x12345");
memcpy(&u64, &x, sizeof u64); printf("(%" PRIx64 ")\n", u64);
x = -strtod("NAN(6789A)",0);
memcpy(&u64, &x, sizeof u64); printf("(%" PRIx64 ")\n", u64);
x = NAN;
mem...
How do I create 7-Zip archives with .NET?
...;
Int32 litContextBits = 3; // for normal files
// UInt32 litContextBits = 0; // for 32-bit data
Int32 litPosBits = 0;
// UInt32 litPosBits = 2; // for 32-bit data
Int32 algorithm = 2;
Int32 numFastBytes = 128;
stri...
How to hide close button in WPF window?
...ort("user32.dll")]
private static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);
private const uint MF_BYCOMMAND = 0x00000000;
private const uint MF_GRAYED = 0x00000001;
private const uint SC_CLOSE = 0xF060;
private const int WM_SHOWWINDOW = 0x00000018;
private const ...
How do you bind an Enum to a DropDownList control in ASP.NET?
...hould be noted that this will not behave correctly of all enum types (like uint, ulong, long, etc.) Normally the most efficient field to search is the key. In this case the that would be the int since integers are a simple <,=,> comparison vs a string's < and > comparison for each char...
How to determine CPU and memory consumption from inside a process?
...struct 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 u...
Can I call memcpy() and memmove() with “number of bytes” set to zero?
...ssembly, and try to copy most of the bits using the native word size (e.g. uint32_t on x86), but that doesn't change the substance of the answer: it's a while loop that doesn't need great calculations before starting, so the check is already done.
– Matteo Italia
...
byte + byte = int… why?
...
C#
ECMA-334 states that addition is only defined as legal on int+int, uint+uint, long+long and ulong+ulong (ECMA-334 14.7.4). As such, these are the candidate operations to be considered with respect to 14.4.2. Because there are implicit casts from byte to int, uint, long and ulong, all the add...
MFC RadioButton用法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...数
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
DECLARE_MESSAGE_MAP()
public:
BOOL m_Radio1;
BOOL m_Radio3;
BOOL m_Radio7;
BOOL m_R...
VC 对话框背景颜色、控件颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
}
方法三 ：重载OnCtlColor (CDC* pDC, CWnd* pWnd, UINT nCtlColor)，即WM_CTLCOLOR消息。具体步骤如下（以上例工程为准）：
①在CExampleDlgDlg的头文件中，添加一个CBrush的成员变量：
class CExampleDlgDlg : public CDia...