5. A macro instance -- verify the password
In this instance, a macro group containing conditions is created to verify the password. If the password is correct, close the identity check window and open another form; if the password is incorrect, a message box is displayed asking you to enter the password again.
Create a form, add a text box, and name it "administrator password" to receive the password en
In_of macro definition, contain_of macro
Container_of is a common macro in Linux kernel. It is used to obtain the pointer of the structure from the pointer contained in a structure, generally, the first address of a member in the struct variable is obtained to obtain the first address of the entire struct variable.
Implementation Method:
Container_of (ptr, type,
Let macro of Common LISP is defined as follows: (Defmacro our-left (binds Body) '(lambda, (mapcar #' (lambda (x) (if (consp X) (Car X )) binds), @ body), @ (mapcar # '(lambda (x) (if (consp X) (cadr x) Nil )) binds); (Our-left (x 1) (Y 2) (+ x y) after expansion, it becomes => (lambda (x y) (+ x y) 1 2) here we can easily see that let is actually a Lambda syntactic sugar :) The let macro of scheme
The Meaning of # # # in C++/C macro definition (define)# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # define.#是字符串化的意思, the # that appears in the macro definition is a string that is followed by a parameter;eg#define STRCPY__ (DST, SRC) strcpy (DST, #src)Strcpy__ (BUFF,ABC) equivalent to strcpy__ (buff, "abc")# #是连接符号, connect the parameters together#define FUN (ARG) my# #argThen Fu
Usage and explanation of CONTAINING_RECORD macro in C ++ Windows, and containing_record macro
Containing record is a very useful technique in C ++ programming, its function is to obtain the base address of a known struct or class, the address of the member in the object, and the struct name or class name. Because it is easy to write, it is used as a macro. #
In this instance, you will create a macro group that will contain the criteria to verify the password, and if the password is correct, close the Identity Check window first, and then open another form; If the password is incorrect, the message box will require the password to be entered again.
Create a form, add a text box, and name it "Admin password" to receive the password that the user entered. Then create a OK button and a Cancel button.
Turn the lens upside down.
You can buy a reverse link (reverse ring adapter), turn the lens upside down and plug in the camera. Generally speaking, we will use standard mirror as the benchmark, because usually in 50mm standard lens, out of the magnification will be 1:1, and shorter focal length of the lens (such as 35mm/28mm, etc.) will have greater magnification.
But this kind of shooting way has the same bad place, is because the lens design reverses the relation, therefore the ed
I feel like a macro. To put it bluntly, it is the flag of a global variable. The method it adds is as follows:
[emailprotected]7817:~/PROJECT/PROJECT_V5/32_kk_qhd_k25$ vim mediatek/config/common/ProjectConfig.mk.global
Projectconfig. mk. Global, as shown in the following figure.
####################################################################################################################################################################
Recently in the construction of new projects, in order to facilitate the development, often use a number of macro definitions, combing the previous project used, and check out the gaps selected some of the network is relatively good, summed up a share to everyone.
/*************************** System Version *****************************/
Get the version of your phone system
#define Hitosystemversion [[[Uidevice Currentdevice] systemversion] fl
A #else the //Compiling without ARC + #endif - //releasing an object $ #defineSafe_delete (P) if (p) {[P release], p = nil;} $ #defineSafe_release (x) [x Release];x=nil - //----------------------Memory-related---------------------------- - the //----------------------Pictures related to---------------------------- - //reading Local picturesWuyi #defineLoadImage (File,ext) [UIImage imagewithcontentsoffile:[[nsbundle mainbundle]pathforresource:file OfType:ext] the //Defining UIImage Objects - #
As shown below we open the EXCEL2007 worksheet and click the Circle in the upper-left corner as shown below
Then we click on "Excel Options" in the Open interface.
Okay, when we open it, we'll hit the "Trust Center" effect as shown below.
Click on the "Trust Center Settings" option to open the entry, the effect shown below
Click the "Macro Settings" option to open the entry details as shown below
Click "Enable
Today, I read chapter 1 "interrupt and interrupt handling procedures" and saw the spin_lock and spin_unlock, so I went into some in-depth research.
The spin_lock macro is defined as follows:
# Define spin_lock (LOCK) _ spin_lock (LOCK)
# DEFINE _ spin_lock (LOCK) _ Lock (Lock)
# DEFINE _ Lock (Lock )/
Do {preempt_disable (); _ acquire (Lock); (void) (Lock);} while (0)
# Define preempt_disable () do {} while (0)
# DEFINE _ acquire (x
Ios development-single-sample macro extraction, ios Development Macro Extraction
In daily development, we often use macros, which are essentially replacing the code during compilation.
Example 1:
// ## Variable names that can be used to splice macros
# Define demo (xxx) int # xxx"
Main (){
Int intA = 10;
Int intB = 20;
NSLog (@ "=======% d", demo (A) + demo (B ));
}
How to Use Singleton ios in development
When there is too much code in your code, it is especially inconvenient to read the code, and you need to use a newline character "\". Be aware of two points when using line breaks:
The 1.c compiler is based on ";" To determine if it is a statement, so as long as it's not wrapped in parentheses, it's OK.
2. Do not put the space in the middle.
line wrap problem when string constants are definedIf we place a backslash at the end of a line of code, the C language compiler ignores line breaks at t
lock APIs are:spin_lock_init (x)This macro is used to initialize the spin lock x. Spin locks must be initialized before they are actually used. The macro is used for dynamic initialization.define_spinlock (x)The macro declares a spin lock x and initializes it. The macro is defined for the first time in 2.6.11 and does
One.#define是C语言中提供的宏定义命令, the main purpose is to provide programmers with certain convenience in programming, and to a certain extent, improve the efficiency of the program, but students often do not understand the nature of the command in learning, always create some confusion here, in the programming of the misuse of the command, To make the program run inconsistent with the intended purpose, or to read the program written by others, the results of the operation to understand the error, which
Inline functions are executed in much the same ways as with parametric macro definitions, but the parameters are handled differently. Macro definitions with parameters do not perform an operation on the parameters, but instead directly replace the
The inline function is the function first, which means that many properties of the function are applicable to the inline function, that is, the inline function fi
Many C + + books have advised us that C-language macros are the root of all evils, but things are not as bad as we think, like Goto. Macros have a big role in automatically generating code for us. If the template can produce various types of code for us (type substitution), then the macro can actually generate new code for us on the symbol (that is, symbol substitution, increment).
Some of the syntax questions about macros can be found on Google. Bel
1 OverviewUsed preprocessing commands starting. For example, include the command # include and macro definition command # define. In the source program, these commands are placed outside the function, and are generally placed before the source file. They are called preprocessing.
Preprocessing refers to the work done before the first scanning (lexical scanning and syntax analysis) of compilation. Preprocessing is an important function of C language, w
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.