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How to check whether a file or directory exists?
...whether the given file or directory exists
func exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil { return true, nil }
if os.IsNotExist(err) { return false, nil }
return false, err
}
Edited to add error handling.
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Capistrano error tar: This does not look like a tar archive
...
Whenever I have hit this error it was because the branch specified in my deploy/environment.rb file wasn't checked into git. Do an add / commit / git push origin branch_name and that will likely make things work.
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Why doesn't Java allow generic subclasses of Throwable?
...:
class ParametricException<T> extends Exception { // compile-time error
private final T value;
public ParametricException(T value) { this.value = value; }
public T getValue() { return value; }
}
An attempt to compile the above reports an error:
% javac ParametricException.java
Para...
How do I add more members to my ENUM-type column in MySQL?
...------------------------------------------+
1 row in set (0.00 sec)
What error are you seeing?
FWIW this would also work:
ALTER TABLE carmake MODIFY COLUMN country ENUM('Sweden','Malaysia');
I would actually recommend a country table rather than enum column. You may have hundreds of countries w...
Twitter API returns error 215, Bad Authentication Data
...= false". We have traced down that it is cURL SSL certificate verification error, that makes Twitter library always return empty response.
– lubosdz
May 14 '15 at 15:20
add a ...
Detect when an image fails to load in Javascript
...) {
var tester=new Image();
tester.onload=imageFound;
tester.onerror=imageNotFound;
tester.src=URL;
}
function imageFound() {
alert('That image is found and loaded');
}
function imageNotFound() {
alert('That image was not found.');
}
testImage("http://foo.com/bar.jpg");
...
Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android
It seems like the most recent Android 4.2 has introduced this error condition on installation when one attempts to install an APK with a lower version. In prior versions of Android, one would be able to install older APK's simply via adb install -r <link to APK> . For debugging purposes, I f...
Mathematical functions in Swift
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In the Swift playground, I get the error: No such module 'Cocoa'
– David Poxon
Jun 11 '14 at 10:31
...
file_put_contents(meta/services.json): failed to open stream: Permission denied
... This should be sudo chmod -R 777 app/storage. to avoid permission error.
– Olaitan Mayowa
Oct 8 '14 at 10:10
5
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Why am I getting 'Assembly '*.dll' must be strong signed in order to be marked as a prerequisite.'?
...s is that you're not working with strongly named assemblies. I've had this error when two projects reference slightly different versions of the same assembly and a more dependent project references these projects. The resolution in my case was to remove the key and version information from the assem...