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How to pass macro definition from “make” command line arguments (-D) to C source code?
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Call make command this way:
make CFLAGS=-Dvar=42
And be sure to use $(CFLAGS) in your compile command in the Makefile. As @jørgensen mentioned , putting the variable assignment after the make command will override the CFL...
Fastest way to convert Image to Byte array
...use an object that has implemented IDisposable, then you should be sure to call Dispose() when you're done with it so that it'll clean up any resources that it has tied up. The using(){} statement just calls it for you when the object goes out of scope of that statement. So you can do myObject.Dispo...
Android OnClickListener - identify a button
...public class Mtest extends Activity {
Button b1;
Button b2;
public void onCreate(Bundle savedInstanceState) {
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b1 = (Button) findViewById(R.id.b1);
b2 = (Button) findViewById(R.id.b2);
b1.setOnClickListener(myhandler1);
b2.setOnClickListener(myhandler2);
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}
Vi...
Coarse-grained vs fine-grained
... a fine-grained service, although the terms are relative. The
former typically requires increased design complexity but can reduce
the number of calls required to complete a task.
A fine grained service interface is about the same like chatty interface.
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Put buttons at bottom of screen with LinearLayout?
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You need to ensure four things:
Your outside LinearLayout has layout_height="match_parent"
Your inside LinearLayout has layout_weight="1" and layout_height="0dp"
Your TextView has layout_weight="0"
You've set the gravity properly on your inner LinearLayout: android:...
How to express a NOT IN query with ActiveRecord/Rails?
...this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
15 Answers
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Check if string begins with something? [duplicate]
...ith something, and I tried using that for this, but it didn't work... Basically, I'm retrieving the url and I want to set a class for an element for pathnames that start in a certain way...
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How to find gaps in sequential numbering in mysql?
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Update
ConfexianMJS provided much better answer in terms of performance.
The (not as fast as possible) answer
Here's version that works on table of any size (not just on 100 rows):
SELECT (t1.id + 1) as gap_starts_at,
(SELECT MIN(t3.id) -...
AngularJS: Basic example to use authentication in Single Page Application
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I've created a github repo summing up this article basically: https://medium.com/opinionated-angularjs/techniques-for-authentication-in-angularjs-applications-7bbf0346acec
ng-login Github repo
Plunker
I'll try to explain as good as possible, hope I help some of you out there:
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Check if object value exists within a Javascript array of objects and if not add a new object to arr
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I've assumed that ids are meant to be unique here. some is a great function for checking the existence of things in arrays:
const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }];
function ad...