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Excel “External table is not in the expected format.”
... an Excel (xlsx) file using the code shown below. I get an "External table is not in the expected format." error unless I have the file already open in Excel. In other words, I have to open the file in Excel first before I can read if from my C# program. The xlsx file is on a share on our network. H...
Difference between the 'controller', 'link' and 'compile' functions when defining a directive
...ular homepage uses controller for one and link for another directive. What is the difference between the two?
4 Answers
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Why catch and rethrow an exception in C#?
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First; the way that the code in the article does it is evil. throw ex will reset the call stack in the exception to the point where this throw statement is; losing the information about where the exception actually was created.
Second, if you just catch and re-throw like that...
Java Class.cast() vs. cast operator
...avoid warnings in "generics land". I often see methods doing things like this:
@SuppressWarnings("unchecked")
<T> T doSomething() {
Object o;
// snip
return (T) o;
}
It's often best to replace it by:
<T> T doSomething(Class<T> cls) {
Object o;
// snip
re...
Why does integer overflow on x86 with GCC cause an infinite loop?
...f happens".
Yes, on x86 CPUs, integers usually wrap the way you expect. This is one of those exceptions. The compiler assumes you won't cause undefined behavior, and optimizes away the loop test. If you really want wraparound, pass -fwrapv to g++ or gcc when compiling; this gives you well-defined (...
Why doesn't requests.get() return? What is the default timeout that requests.get() uses?
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What is the default timeout that get uses?
The default timeout is None, which means it'll wait (hang) until the connection is closed.
What happens when you pass in a timeout value?
r = requests.get(
'http://www.justdial.co...
Determine if running on a rooted device
... certain piece of functionality that will only work on a device where root is available. Rather than having this feature fail when it is used (and then show an appropriate error message to the user), I'd prefer an ability to silently check if root is available first, and if not,hide the respective o...
Is background-color:none valid CSS?
Can anyone tell me if the following CSS is valid?
7 Answers
7
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Why use multiple columns as primary keys (composite primary key)
This example is taken from w3schools .
9 Answers
9
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How many characters can UTF-8 encode?
If UTF-8 is 8 bits, does it not mean that there can be only maximum of 256 different characters?
10 Answers
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