hcm meaning

Assign: Simple assignment, not changing index count-(void) Setmyobject: (ID) newvalue{_myobject=NewValue;} Copy: Create an object with an index count of 1 and then release the old object-(void) Setmyobject: (ID) newvalue{if(_myobject! =newvalue) {[_myobject release]; _myobject=[newvalue Copy]; }retain: Frees the old object, assigns the value of the old object to the input object, and then increases the index count of the input object to 1-(void) Setmyobject: (ID) newvalue{if(_myobject! =

Values begin with a # sign.The first 2 digits represent the transparency of the color, 00~FF, 00 indicates that the color is completely transparent, and FF indicates that the color is completely opaque.The latter 6 digits represent the RGB value of the color. such as: 000000 for Black, ffffff for white, ff0000 for red, 00ff00 for Green, 0000ff for blue, ffff00 for yellow.The following is an example of the background color of the slide-by menu (set to yellow here), which describes transparency.1

android:drawable attribute in the color_selector.xml above, Know that Android should be based on the folder to determine, in the Color folder file has the Android:color property, the file under the Drawable folder has the Android:drawable propertyIt is also important to note that the files referenced by the TextColor and background properties cannot be referenced in a random way, such as textcolor references Drawable_selector.xml,background references Color_ Selector.xml will make an error. So

index count of the input object to 1Use assign: for underlying data types (nsinteger,cgfloat) and C data types (int, float, double, char, and so on)Using copy: On NSStringUse retain: For other nsobject and its subclassesNonatomic, non-atomic access, no synchronization, multi-threaded concurrent access improves performance. Note that if you do not add this property, the default is two access methods are atomic transaction access@property (nonatomic, retain) Uitextfield *username automatically ge

contribution of different factors to a phenomenon is the so-called detailed analysis model. A lot of things that we seem to be unchanged, in fact, the internal composition of the proportion of the great changes have taken place. And some seemingly changing things, the relative relationship in fact there is no change, but a simple number of fluctuations. 　　 The website says average daily IP/PV visit volume is about 600/2400 means, today visit first page number is 2,400 times, Access IP is 600. T

Class A, and another class B inherits Class A. The following code is available:A = new B (); This is called the parent class's reference A to the subclass object, new B ();If your A is an interface, or an abstract class, then it is not possible to create an object, so that writing can also be used to refer to his subclass or to the object that implements the class. It's not obvious that this sentence is written here. In fact, it is mainly used in the parameters of the method, that is, polymorphi

]= This. Embeddedvalueresolver.resolvestringvalue (Patterns[i]); } returnResolvedpatterns; } } The spring code is not very obscure, interested in child shoes research propertyplaceholderconfigurer (and if it does not find the XXX key defined in ${xxx}, it will also go to the JVM System Properties (System.getproperty () ) and Environment variables (system.getenv ()).Summarize:XML file, if ${} is used, the work of parsing depends on the third-party jar;

object visible content, excluding the scroll bar, excluding the border;10. ClientHeight: Gets the height of the object's visible content, excluding the scroll bar, not including the border;11. ClientLeft: Gets the border width of the object12. ClientTop: Gets the border height of the object13, OffsetParent: The parent Layer object of the current object.IE6.0, ff1.06+:clientwidth = width + paddingclientheight = height + paddingoffsetwidth = width + padding + borderoffsetheight = height + padding

Linux shell status test expression meaning file test-d directory-s file length is greater than 0, non-empty-f Regular file-w writable-L symbol connection-u file has s u I d bit set-r readable-x executable-nt to test whether file1 is updated than file2. The modification date will be used for this comparison with the next comparison. -Ot test whether file1 is older than file2. -Ef tests whether file1 is a hard link to file2. Numerical Test-the eq value

Meaning of linux folders (the most complete version)/bin: where binary programs live. /boot: the special programs that start the system when you turn the machine on. /dev: aaaaaalll the "device" listings for hardware of every concievable flavor, along with some "imaginary" devices, lile/dev/null and/dev/zero. when you get a random number it usually comes from/dev/random. /etc: configuration files. /home: the user's directories Live here. /lib: the lib

. Therefore, in order to overcome these shortcomings, the stateless (statelessness) architectural style attributes have received extensive attention. Stateless that each maintain their own state, such as session information in the client, the server does not save state information, then we can say that the server is stateless, the benefits are obvious, the stateless parts can be easily replaced (or clustered, scale-out) without state reconstruction (or synchronization), Greatly improved the sc

Meta name KeywordsMeta is an accessible tag in the head area of the HTML language. In almost all pages, we can see HTML code similar to the following:Maybe you think the code is dispensable. In fact, if you can use good meta tags, will bring you unexpected results, such as keywords will be automatically collected by large search sites automatically, you can set the page format and refresh and so on.I. Composition of META tagsMeta tags have a total of two properties, which are the Http-equiv prop

can perform complex operations, so I have the idea of learning Python.Then follow the steps on the rookie tutorial to learn how to build a python environment. This can refer to the blog Park this article http://www.cnblogs.com/windinsky/archive/2012/09/20/2695520.htmlAnd then the development of the platform, I try to install Python in the process, with the current more popular words, found there is a way to say.As for the code, I wrote a Hello world, something more complicated, and it's officia

The anonymous inner class (Anonymous Inner Class), when the instance is created, gives the definition of the class, all of which are done in an expression. Java Code ? 1 2 3 4 Runnable rn = new Runnable () { public void Run () { } }; equivalent to: Java Code ? 1 2 3 4 5 class Anomymous implements Runnable { public void Run () { } } Runnable rn = new anomymous (); you can see that the former is more concise. (Note t

, the responsibility of the client, such as the client's request for a non-existent resource, the client is not authorized, access is forbidden, etc. 5XX processing error, the responsibility on the server side, such as the server throws an exception, routing error, HTTP version is not supported and so on. Here are a few common status codes:OKWhat you would most like to see is the process of success!303 See otherI redirect you to other pages where the URL of the target tells you by the l

understood as the object's direct quantity (meaning 2), "object. xx indicates that the object member is obtained. Naturally, the vertex operator following the object can be executed normally. BracketsJavaScript Brackets have four Semantics Syntax 1: declare an array Var ary = []; // declare an empty arrayVar ary = [1, 3]; // declare an array and assign the Initial Value Semantics 2: retrieve array members Var ary = [1, 2, 3]; var item = ary [0]; Sema

index count of the input object to 1Use assign: for underlying data types (nsinteger,cgfloat) and C data types (int, float, double, char, and so on)Using copy: On NSStringUse retain: For other nsobject and its subclassesNonatomic, non-atomic access, no synchronization, multi-threaded concurrent access improves performance. Note that if you do not add this property, the default is two access methods are atomic transaction access@property (nonatomic, retain) Uitextfield *username automatically ge

): ... Print args # 1>>> one () >>> one (1, 2, 3) (1, 2, 3) >>> def (x, Y, *args): # 2 ... Print x, y, args>>> (' A ', ' B ', ' C ') a B (' C ') The first function one simply prints out any positional parameters that are passed to it (if any). As you see in the # # place, inside the function we just quoted the args variable--*args just to indicate that the positional parameter in the function definition should be stored in the variable args. Python also allows us to specify some variable

Resolve the differences between VC6X86 and VC9X86 in PHP and the meaning of NonThreadSafe. PHP version 5.3.0 is now available, but there are several different versions to download. That is, VC6X86 and VC9X86. First, let me answer: What is VC6? VC6 is the version of legacyVisualStudio6 PHP 5.3.0, but there are several different versions to download. That is, VC6 X86 and VC9 X86. First, let me answer: What is VC6?VC6 is compiled by the legacy Visual St

Call its init function without calling its internal methodIn the Golang, import is the role of importing other package, but today in the look at the Beego framework saw the import underline, do not know its meaning, so Baidu and solution.Import underline (For example: import _ Hello/imp) Effect:When importing a package, all init () functions are executed in the file under the package, however, sometimes we don't need to import the entire package, just