Augmented reality technology(Augmented Reality, AR), is a real-time computing camera image position and angle and with the corresponding image, video, 3D model technology, the goal is to screen the virtual world in the real world and interact.
What does AR include:The techniques and steps required for a simplest AR scenario implementation are contained in the f
PHP development framework YiiFramework tutorial (27) database-example of association with ActiveRecord
We have learned how to use Active Record (AR) to obtain data from a single data table. This section describes how to use AR to connect multiple related data tables and retrieve the joined dataset.
To use relational AR, we recommend that you define the primary ke
TCPServer
1, the use of communication channels: socket
2, the use of the basic functions:
①bind,
②listen,
③beginaccept
④endaccept
⑤beginreceive
⑥endreceive
3, function parameter description
Socket listener = new socket (addressfamily.internetwork,
SocketType.Stream, protocoltype.tcp);
The parameters used for the new socket are the predefined amounts of the system and are selected for use directly.
Listener. Bind (Localendpoint);
Localendpoint represent
Article Title: analysis and use of static link libraries in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
At the C language level, code reuse is usually implemented through libraries. In the traditional sense, a library refers to a file ending with the suffix.. Strictly speaking, the function library should be divided into two types: static Link Libr
Release two tree arrays without recursion. create two tree arrays without recursion. create PHPcode/*** create parent node tree array * parameter * $ ar array, data organized in the list of Joins * $ the subscript or associated key name of the primary key in the id array * $ the subscript or associated key name of the parent key in the pid array * returns the multi-dimensional array and publishes two unused recursive tree array constructor
Release two
hardwareTips:The called sub-function can get the address of the array, but it does not know the number of elements in the array, two options: 1. The function code writes a fixed array size of 2. Pass a parameter representing the quantityDeclaring array parameters:int sum (int *ar,int n);int sum (int *,int);int sum (int ar[],int n);int sum (int [],int n);The name is not omitted when defined:int sum (int *
);Client. Close ();} Catch (Exception e ){Console. WriteLine (e. ToString ());}}Private static void ConnectCallback (IAsyncResult ar ){Try {// Retrieve the socket from the state object.Socket client = (Socket) ar. AsyncState;// Complete the connection.Client. EndConnect (ar );Console. WriteLine ("Socket connected to {0 }",Client. RemoteEndPoint. ToString ());//
display details.
[Preview]
The above is basically nonsense. The following list of things I encountered during development may not be worth mentioning for people I know, but for the people I did this for the first time, is the accumulation of experience.
Datasets, parameters, and filters
When designing a dataset, parameters, queries, filtering, and other actions are often required. Parameters and filters are provided in reportingservic, which is very useful for some simple filtering c
$keyword =strtr ($keyword, Array ('% ' => ' n% ', ' => ' n '));$command->where (' Like ', ' title ', '% '. $keyword. %'));
Add so much that you don't know what the synthesized SQL looks like, you can use->text to view (Magic method)If you feel the combination of SQL is not wrong, then execute him, add->queryall (); This gets all the matching result sets.Of course, if you are certain that only one row of the result set is executed, you can add->queryrow () to get it directly.If a Cdbcommand obje
I. ProblemsLet's look at one example:
$ar = Array (1, 2, 3);Var_dump ($ar);foreach ($ar as $v) {}foreach ($ar as $v) {}Var_dump ($ar);?>The output is:
Array (3) {[0]=>Int (1)[1]=>Int (2)[2]=>Int (3)}Array (3) {[0]=>Int (1)[1]=>Int (2)[2]=>int (2)}??? Why is the value of t
boost, the two libraries associated with serialization are the archive library and the serialization library.8.1.2 Implementation StepsFirst, a corresponding serialize (Archive AR, const unsigned int version) method is implemented for the serialized class;Second, constructs an object of the Boost::archive::text_oarchive class or other archive output class and associates it to an output stream, using the Finally, you construct an object of the Boost:
ffmpeg.exe-I f: \ hacker house \ hacker Song-AB 56-ar 22050-B 500-R 15-s 320x240 F: \ 11.flv FFMPEG-I f: \ 01.wmv-AB 56-ar 22050-B 500-R 15-s 320x240 F: \ test. FLV use the-SS parameter (time_off set the Start Time Offset) to start the conversion task from a specified time point. For example: capture the thumbnail while converting the file format: FFMPEG-I "test. avi "-y-F image2-SS 8-T 0.001-s 350x240
Knowing the editions selected in the browser of our visitors may be a very important data we may used to redirect the user to a specific page in the corresponding language, or to display specific information directed to the user (as for example the most suitable AD ).
The basic command we will use to know the specified ages selected in the browser is this one:
Request. servervariables ("http_accept_language ")
You may get the complete code here. The list of versions may be obtain
Php array recursive output this post is finally edited by ecshop528 from 2013-01-211:54:22 $ ar nbsp; array (0 gt; array (name gt; name1, age gt; age1), 1 gt; array (name gt; name2, age gt; php array recursive output
This post was last edited by ecshop528 at 12:54:22$ Ar = array ('0' => array ('name' => 'name1', 'age' => 'ag1 '), '1' => array ('name' => 'name2', 'age' => 'age2 '), '2' => array ('nam
zval instead of opening a separate zval for str2. By doing so, the memory can be saved to a certain extent. The correspondence between str, str2 and zval is as follows:
3. When unset is used, the corresponding zval refcount value is reduced.
$str = "test zval";$str3 = $str2 = $str;xdebug_debug_zval('str');unset($str2,$str3)xdebug_debug_zval('str');
Result:
str: (refcount=3, is_ref=0)='test zval'str: (refcount=1, is_ref=0)='test zval'
Since unset ($ str2, $ str3) deletes
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.