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Objective-C parse hex string to integer
...cases that NSScanner gives you more control over.
– Quintin Willison
Mar 30 '17 at 14:15
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Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...ue representation of that particular size of integer.
and e.g. result of UINT_MAX + 1 is mathematically defined - by the rules of arithmetic modulo 2n
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What is the tilde (~) in the enum definition?
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So it's the equivalent of All = Int32.MaxValue? Or UInt32.MaxValue?
– Joel Mueller
Dec 23 '08 at 18:52
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Extracting text OpenCV
....RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)
mask = np.zeros(bw.shape, dtype=np.uint8)
for idx in range(len(contours)):
x, y, w, h = cv2.boundingRect(contours[idx])
mask[y:y+h, x:x+w] = 0
cv2.drawContours(mask, contours, idx, (255, 255, 255), -1)
r = float(cv2.countNonZero(mask[y:y+h, x:...
Saving a Numpy array as an image
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Using third axis of an array of uint8 to code RGB works with this method. Module PIL can be installed using "pip install pillow".
– bli
Aug 16 '17 at 8:16
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Show a Form without stealing focus?
... SW_SHOWNOACTIVATE = 4;
private const int HWND_TOPMOST = -1;
private const uint SWP_NOACTIVATE = 0x0010;
[DllImport("user32.dll", EntryPoint = "SetWindowPos")]
static extern bool SetWindowPos(
int hWnd, // Window handle
int hWndInsertAfter, // Placement-order handle
int ...
Better way to get type of a Javascript variable?
... The regex would also need to include numbers for things like Uint8Array. Instead, consider the more general match(/\s([^\]]+)/) which should handle anything.
– Lily Finley
Jan 19 '15 at 22:43
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Printing hexadecimal characters in C
...ng and 2 to set the width to 2. x or X for lower/uppercase hex characters.
uint8_t a = 0x0a;
printf("%02hhX", a); // Prints "0A"
printf("0x%02hhx", a); // Prints "0x0a"
Edit: If readers are concerned about 2501's assertion that this is somehow not the 'correct' format specifiers I suggest they rea...
When should I use malloc in C and when don't I?
...ory leaks when using malloc. Consider this code:
int do_something() {
uint8_t* someMemory = (uint8_t*)malloc(1024);
// Do some stuff
if ( /* some error occured */ ) return -1;
// Do some other stuff
free(someMemory);
return result;
}
Do you see what's wrong with this c...
How to convert a string of bytes into an int?
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"L" is actually uint32 (4 bytes). If as in my case you need 8 bytes, use "Q"-->uint64. Also note that "l"-->int32 and q-->int64
– ntg
May 31 '17 at 6:26
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