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Better way to check variable for null or empty string?
... be reversed to test for success as such:
if ( !$question ) {
// Handle error here
}
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Open document with default OS application in Python, both in Windows and Mac OS
...y back to Python 2.4, you can use subprocess.call() and implement your own error checking:
try:
retcode = subprocess.call("open " + filename, shell=True)
if retcode < 0:
print >>sys.stderr, "Child was terminated by signal", -retcode
else:
print >>sys.stder...
Check if image exists on server using JavaScript?
... good, bad) {
var img = new Image();
img.onload = good;
img.onerror = bad;
img.src = imageSrc;
}
checkImage("foo.gif", function(){ alert("good"); }, function(){ alert("bad"); } );
JSFiddle
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Testing HTML email rendering [closed]
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answered Aug 24 '09 at 19:05
DanDan
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Hibernate - A collection with cascade=”all-delete-orphan” was no longer referenced by the owning ent
...erenced distinctly points out creating a new HashSet but you can have this error anytime you reassign the set. For example:
public void setChildren(Set<SonEntity> aSet)
{
this.sonEntities = aSet; //This will override the set that Hibernate is tracking.
}
Usually you want to only "new" ...
Why does UITableViewCell remain highlighted?
... |
edited Nov 19 '15 at 7:05
Mihir Oza
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Database Diagram Support Objects cannot be Installed … no valid owner
I tried to create a database diagramm with SQL Server 2008, but an error occurs:
14 Answers
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How do I find out which process is locking a file using .NET?
... to determine file locker.");
try
{
const int ERROR_MORE_DATA = 234;
uint pnProcInfoNeeded = 0,
pnProcInfo = 0,
lpdwRebootReasons = RmRebootReasonNone;
string[] resources = new string[] { path }; // Just checking...
commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
...alue>
</context-param>
and you are also not seeing any googlable errors and/or warnings in browser's JavaScript console (press F12 in Chrome/Firefox23+/IE9+ to open the web developer toolset and then open the Console tab), then work through below list of possible causes.
Possible causes
U...
Django: ImproperlyConfigured: The SECRET_KEY setting must not be empty
...ough. When I try to run ./manage.py runserver I am getting the following error:
25 Answers
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