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What should my Objective-C singleton look like? [closed]
...ig Brautaset: No, it is not okay to leave out the @synchronized in this example. It is there to handle the possible race-condition of two threads executing this static function at the same time, both getting past the "if(!sharedSingleton)" test at the same time, and thus resulting in two [MySinglet...
Python matplotlib multiple bars
How to plot multiple bars in matplotlib, when I tried to call the bar function multiple times, they overlap and as seen the below figure the highest value red can be seen only.
How can I plot the multiple bars with dates on the x-axes?
...
How to get folder path from file path with CMD
...an use this one-liner:
cd "c:\directory\subdirectory\filename.exe\..\.." && dir /ad /b /s
This would return the following:
c:\directory\subdirectory
The .... drops back to the previous directory.
/ad shows only directories
/b is a bare format listing
/s includes all subdirectories. Thi...
The difference between fork(), vfork(), exec() and clone()
...int sys_fork(struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.esp, &regs, 0);
}
asmlinkage int sys_clone(struct pt_regs regs)
{
unsigned long clone_flags;
unsigned long newsp;
clone_flags = regs.ebx;
newsp = regs.ecx;
if (!newsp)
newsp = regs.esp;
return ...
Detect if Android device has Internet connection
...hen check the responsecode for 204
return (urlc.getResponseCode() == 204 && urlc.getContentLength() == 0);
then you don't have to fetch the entire google home page first.
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Good Hash Function for Strings
...tes.length * 2);
for(final byte b : bytes) {
sb.append(hex[(b & 0xF0) >> 4]);
sb.append(hex[b & 0x0F]);
}
return sb.toString();
}
public static String getStringFromSHA256(String stringToEncrypt) throws NoSuchAlgorithmException {
MessageDigest messageDig...
Error to install Nokogiri on OSX 10.9 Maverick?
...led ruby with rvm :
rvm remove ruby 2.0.0p451
rvm remove ruby-2.0.0-p451 && rvm install ruby-2.0.0-p451
I was then able to
gem install nokogiri --no-ri --no-rdoc
Problem solved.
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How to send an email with Gmail as provider using Python?
... want to use Port 465 you have to create an SMTP_SSL object:
# SMTP_SSL Example
server_ssl = smtplib.SMTP_SSL("smtp.gmail.com", 465)
server_ssl.ehlo() # optional, called by login()
server_ssl.login(gmail_user, gmail_pwd)
# ssl server doesn't support or need tls, so don't call server_ssl.starttls(...
How to put multiple statements in one line?
...pproximate what you want.
As for the try ... except thing: It would be totally useless without the except. try says "I want to run this code, but it might throw an exception". If you don't care about the exception, leave away the try. But as soon as you put it in, you're saying "I want to handle a ...
Reading an image file into bitmap from sdcard, why am I getting a NullPointerException?
How can I read an image file into bitmap from sdcard?
4 Answers
4
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