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Convert an image (selected by path) to base64 string
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109
Get the byte array (byte[]) representation of the image, then use Convert.ToBase64String(), st...
Print current call stack from a method in Python code
...():
print(line.strip())
f()
# Prints:
# File "so-stack.py", line 10, in <module>
# f()
# File "so-stack.py", line 4, in f
# g()
# File "so-stack.py", line 7, in g
# for line in traceback.format_stack():
If you really only want to print the stack to stderr, you can use:
...
How to write iOS app purely in C
...Float []) { 1, 0, 0, 1 });
CGContextAddRect(context, (struct CGRect) { 10, 10, 20, 20 });
CGContextFillPath(context);
}
// Once again we use the (constructor) attribute. generally speaking,
// having many of these is a very bad idea, but in a small application
// like this, it really shou...
ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type
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edited Apr 11 '17 at 23:10
Charlie
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answered Apr 22 '14 at 18...
关于 __VA_ARGS__ 宽字符版本的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
关于 __VA_ARGS__ 宽字符版本的问题在写一个可变参数的记录日志函数，考虑到宽字符（Unicode版本）时：#define WIDEN2(x) L ## x#define WIDEN(x) WIDEN2(x)#define __...在写一个可变参数的记录日志函数，考虑到宽字符（Unicode版本）时：
#defin...
How do I raise the same Exception with a custom message in Python?
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edited Feb 12 '19 at 10:58
dreftymac
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How to get last items of a list in Python?
... the python CLI interpreter:
>>> a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
>>> a[-9:]
[4, 5, 6, 7, 8, 9, 10, 11, 12]
the important line is a[-9:]
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Type-juggling and (strict) greater/lesser-than comparisons in PHP
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answered Apr 4 '13 at 14:10
NikiCNikiC
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How do I make a textbox that only accepts numbers?
... Bitterblue
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answered Jan 20 '09 at 22:04
Matt HamiltonMatt Hamilton
1...
What can , and be used for?
...available by #{id} in the view.
So when you open the page as foo.xhtml?id=10 then the parameter value 10 get set in the bean this way, right before the view is rendered.
As to validation, the following example sets the param to required="true" and allows only values between 10 and 20. Any validatio...