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The definitive guide to form-based website authentication [closed]
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PART I: How To Log In
We'll assume you already know how to build a login+password HTML form which POSTs the values to a script on the server side for authentication. The sections below will deal with patterns for sound practical auth, and how to avoid the most commo...
Android – Listen For Incoming SMS Messages
...coming SMS messages, and launch a program via incoming SMS, also it should read the content from the SMS.
9 Answers
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Why use prefixes on member variables in C++ classes
...esaving and bug-reducing approach.
I use:
m for members
c for constants/readonlys
p for pointer (and pp for pointer to pointer)
v for volatile
s for static
i for indexes and iterators
e for events
Where I wish to make the type clear, I use standard suffixes (e.g. List, ComboBox, etc).
This mak...
asynchronous vs non-blocking
.... Asynchronous Win32 sockets "marshal" their results onto a specific GUI thread by passing Window messages, whereas .NET asynchronous IO is free-threaded (you don't know what thread your callback will be called on).
So they don't always mean the same thing. To distil the socket example, we could sa...
How well is Unicode supported in C++11?
I've read and heard that C++11 supports Unicode. A few questions on that:
5 Answers
5
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In Bash, how do I add a string after each line in a file?
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Pure POSIX shell and sponge:
suffix=foobar
while read l ; do printf '%s\n' "$l" "${suffix}" ; done < file |
sponge file
xargs and printf:
suffix=foobar
xargs -L 1 printf "%s${suffix}\n" < file | sponge file
Using join:
suffix=foobar
join file file -e "${suffix}" ...
How can I trim leading and trailing white space?
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Probably the best way is to handle the trailing white spaces when you read your data file. If you use read.csv or read.table you can set the parameterstrip.white=TRUE.
If you want to clean strings afterwards you could use one of these functions:
# Returns string without leading white space
trim...
How to grep for two words existing on the same line? [duplicate]
... number of matches. Similarly, there is no reason to use -r. I suggest you read man grep.
To grep for 2 words existing on the same line, simply do:
grep "word1" FILE | grep "word2"
grep "word1" FILE will print all lines that have word1 in them from FILE, and then grep "word2" will print the line...
Why does C++ need a separate header file?
...having to include header files, but having to explicitly check if it has already been included.
13 Answers
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C# vs Java generics [duplicate]
...ks here and there (most notably in constraints). But basically if you can read one, you can likely read/use the other.
The biggest difference though is in the implementation.
Java uses the notion of type erasure to implement generics. In short the underlying compiled classes are not actually...