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How do I invert BooleanToVisibilityConverter?
I'm using a BooleanToVisibilityConverter in WPF to bind the Visibility property of a control to a Boolean . This works fine, but I'd like one of the controls to hide if the boolean is true , and show if it's false .
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How to close this ssh tunnel? [closed]
I opened a ssh tunnel as described in this post: Zend_Db: How to connect to a MySQL database over SSH tunnel?
3 Answers
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How to sort an array in Bash
...orted[@]}"
[3 5]
[a c]
[b]
[f]
Note: @sorontar has pointed out that care is required if elements contain wildcards such as * or ?:
The sorted=($(...)) part is using the "split and glob" operator. You should turn glob off: set -f or set -o noglob or shopt -op noglob or an element of the array l...
HTTP Error 503, the service is unavailable
I'm really new to setting up web servers in general. I've got IIS 8 on Windows 8, and I'm trying to set up a little site locally, while doing some development. In IIS I choose Add Site, give a name, points to a location where I have a index.html file (I've tried different locations, latest in a c:\...
What is the purpose of double curly braces in React's JSX syntax?
From the react.js tutorial we see this usage of double curly braces:
7 Answers
7
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How can I check whether an array is null / empty?
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There's a key difference between a null array and an empty array. This is a test for null.
int arr[] = null;
if (arr == null) {
System.out.println("array is null");
}
"Empty" here has no official meaning. I'm choosing to define empty as having 0 elements:
arr = new int[0];
if (arr.lengt...
How to fix “Incorrect string value” errors?
After noticing an application tended to discard random emails due to incorrect string value errors, I went though and switched many text columns to use the utf8 column charset and the default column collate ( utf8_general_ci ) so that it would accept them. This fixed most of the errors, and made ...
C++ Returning reference to local variable
Is the following code (func1()) correct if it has to return i? I remember reading somewhere that there is a problem when returning reference to a local variable. How is it different from func2()?
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Is there a way to get the source code from an APK file?
...for an app that I have been working on for the past two months.
All I have is the APK file that is stored in my email from when I sent it to a friend.
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