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What is the difference between lock and Mutex?
... than one instance of an application.
2nd example is say you are having a file and you don't want different process to access the same file , you can implement a Mutex but remember one thing Mutex is a operating system wide and cannot used between two remote process.
Lock is a simplest way to prot...
Run a JAR file from the command line and specify classpath
I've compiled a JAR file and specified the Main-Class in the manifest (I used the Eclipse Export function). My dependencies are all in a directory labeled lib . I can't seem to get a straight answer on how to execute my JAR file while specifying it should use the lib/* as the classpath.
...
How to install PyQt4 on Windows using pip?
...kages built by Chris Golke - Python Windows Binary packages - PyQt
In the filenames cp27 means C-python version 2.7, cp35 means python 3.5, etc.
Since Qt is a more complicated system with a compiled C++ codebase underlying the python interface it provides you, it can be more complex to build than ...
What is the actual use of Class.forName(“oracle.jdbc.driver.OracleDriver”) while connecting to a dat
...dbc.driver.OracleDriver. You do not need to register it if the driver jar file is in the "WEB-INF\lib" directory, if you are using Tomcat. Save this as test.jsp and put it in your web directory, and redeploy your web app folder in Tomcat manager:
<%@ page import="java.sql.*" %>
<HTML>...
Why doesn't Java allow overriding of static methods?
...Here is some code which illustrates the current state of affairs in Java:
File Base.java:
package sp.trial;
public class Base {
static void printValue() {
System.out.println(" Called static Base method.");
}
void nonStatPrintValue() {
System.out.println(" Called non-static Base met...
Storing WPF Image Resources
...yImageSource}" />
In my case, I found that I had to set the Image.png file to have a build action of Resource rather than just Content. This causes the image to be carried within your compiled assembly.
share
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Rails DB Migration - How To Drop a Table?
...te.
rails generate migration DropProductsTable
This will generate a .rb file in /db/migrate/ like 20111015185025_drop_products_table.rb
Now edit that file to look like this:
class DropProductsTable < ActiveRecord::Migration
def up
drop_table :products
end
def down
raise Active...
Do I need to disable NSLog before release Application?
...onfiguration and not for Beta or Release versions. Then in a common header file you can do something like:
#ifdef DEBUG_MODE
#define DLog( s, ... ) NSLog( @"<%p %@:(%d)> %@", self, [[NSString stringWithUTF8String:__FILE__] lastPathComponent], __LINE__, [NSString stringWithFormat:(s), ##__VA_A...
Android: how to draw a border to a LinearLayout
I have three files. The XML, the draw function and the main Activity.
I have some LinearLayout in my XML file.
2 Answers
...
One or more types required to compile a dynamic expression cannot be found. Are you missing referenc
...ged .Net version from 4.5 to 4.5.1.
To achieve this go to your web.config file and change the following lines
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
to this
<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime t...