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What's the best way to check if a file exists in C?
...s (char *filename) {
struct stat buffer;
return (stat (filename, &buffer) == 0);
}
and call it like this:
#include <stdio.h> // printf
int main(int ac, char **av) {
if (ac != 2)
return 1;
if (file_exists(av[1]))
printf("%s exists\n", av[1]);
e...
No Swipe Back when hiding Navigation Bar in UINavigationController
....count > 1){
return true
}
return false
}
http://www.gampood.com/pop-viewcontroller-with-out-navigation-bar/
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Make an existing Git branch track a remote branch?
...l. It offers simple commands for creating, publishing, deleting, tracking & renaming remote branches. One nice feature is that you can ask a grb command to explain what git commands it would execute.
grb explain create my_branch github
# git_remote_branch version 0.3.0
# List of operations to ...
Create a pointer to two-dimensional array
...[][20] = l_matrix;
If you fix the error and add the address-of operator & like in the following snippet
uint8_t (*matrix_ptr)[][20] = &l_matrix;
Then that one creates a pointer to an incomplete array type of elements of type array of 20 uint8_t. Because the pointer is to an array of arr...
Random Gaussian Variables
Is there a class in the standard library of .NET that gives me the functionality to create random variables that follow Gaussian distribution?
...
How do I export UIImage array as a movie?
...input of type AVAssetWriterInput, which in turn has a method called appendSampleBuffer: that lets you add individual frames to a video stream. Essentially you’ll have to:
1) Wire the writer:
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURL...
Verifying that a string contains only letters in C#
... foreach (char c in s)
{
if (!Char.IsLetterOrDigit(c) && c != '_')
return false;
}
return true;
}
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How can I parse a YAML file from a Linux shell script?
...:// (for URLs)
s/$/"/g appends " to the end of each line
s/ *=/=/g removes all spaces before =
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Javascript - removing undefined fields from an object [duplicate]
...for the info!)
Object.keys(obj).forEach(key => obj[key] === undefined && delete obj[key])
jsbin
Same example using if expression:
Object.keys(obj).forEach(key => {
if (obj[key] === undefined) {
delete obj[key];
}
});
If you want to remove the items from nested objects as...
Regex for password must contain at least eight characters, at least one number and both lower and up
...e number and one special character:
"^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!%*#?&]{8,}$"
Minimum eight characters, at least one uppercase letter, one lowercase letter and one number:
"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$"
Minimum eight characters, at least one upp...