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Is there a way to detect if an image is blurry?
...e Central Moment (Shirvaikar2004)
if ~isinteger(Image), Image = im2uint8(Image);
end
FM = AcMomentum(Image);
case 'BREN' % Brenner's (Santos97)
[M N] = size(Image);
DH = Image;
DV = Image;
DH(1:M-2,:) = diff(Image,2,1);
DV(:,1:N-2)...
VC DDE（Dynamic Data Exchange）与EXCEL连接 - C/C++ - 清泛网 - 专注C/C++及内核技术
...include "ddeml.h"
#include "stdio.h"
HDDEDATA CALLBACK DdeCallback(
UINT uType, // Transaction type.
UINT uFmt, // Clipboard data format.
HCONV hconv, // Handle to the conversation.
HSZ hsz1, // Handle to a string.
HSZ hsz2, // Handle to a string.
...
Generate random string/characters in JavaScript
...rateId :: Integer -> String
function generateId (len) {
var arr = new Uint8Array((len || 40) / 2)
window.crypto.getRandomValues(arr)
return Array.from(arr, dec2hex).join('')
}
console.log(generateId())
// "82defcf324571e70b0521d79cce2bf3fffccd69"
console.log(generateId(20))
// "c1a050a4cd...
What is the difference between quiet NaN and signaling NaN?
..._limits
#pragma STDC FENV_ACCESS ON
void print_float(float f) {
std::uint32_t i;
std::memcpy(&i, &f, sizeof f);
std::cout << std::hex << i << std::endl;
}
int main() {
static_assert(std::numeric_limits<float>::has_quiet_NaN, "");
static_assert(s...
What is boxing and unboxing and what are the trade offs?
...
Javascript has so called typed arrays (new UInt32Array etc) which are arrays of unboxed ints and floats.
– nponeccop
Jun 30 '12 at 6:03
add a c...
Difference between objectForKey and valueForKey?
...@(10), @"Y":@(20)} valueForKey:@"Z"]); // prints "Value for Z:(null)"
uint32_t testItemsCount = 1000000;
// create huge dictionary of numbers
NSMutableDictionary *d = [NSMutableDictionary dictionaryWithCapacity:testItemsCount];
for (long i=0; i<testItemsCount; ++i) {
// m...
Practical use of `stackalloc` keyword
...ublic static unsafe extern HResult CfGetPlaceholderInfo(IntPtr fileHandle, uint infoClass, void* infoBuffer, uint infoBufferLength, out uint returnedLength);
You can make use of stackalloc.
byte* buffer = stackalloc byte[1024];
CfGetPlaceholderInfo(fileHandle, 0, buffer, 1024, out var returnedLen...
在ATL无窗口ActiveX 控件中如何使用定时器？ - C/C++ - 清泛网 - 专注C/C++及内核技术
... TimerProc(
HWND hwnd, // 定时器消息的窗口句柄
UINT message, // WM_TIMER 消息
INT_PTR idTimer, // 定时器标志
DWORD dwTime) // 当前系统启动计时
{
...
}
调用方法：
UINT nRet = SetTimer(NULL, // handle to main windo...
windows异常处理 __try __except - C/C++ - 清泛网 - 专注C/C++及内核技术
...ACK_OVERFLOW) ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
}
UINT WINAPI ThreadFunc(LPVOID param)
{
__try
{
// guarded code
}
__except (FilterFunc(GetExceptionCode()))
{
// 如果是栈溢出，进行处理。
}
return TRUEt;
}
except参数的...
Convert List into Comma-Separated String
...
Enjoy!
Console.WriteLine(String.Join(",", new List<uint> { 1, 2, 3, 4, 5 }));
First Parameter: ","
Second Parameter: new List<uint> { 1, 2, 3, 4, 5 })
String.Join will take a list as a the second parameter and join all of the elements using the string passed as th...