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IOS about decorating the agent with weak or assign

1. For strong: The object strongly references delegate, the outside world cannot destroy the delegate object, which causes the circular reference (Retain Cycles)Because our general agent is the current controller, such as Scrollview.delegate = self, this is a circular reference to the above circle. If delegate is a strong pointer, then the retaincount of Uiviewcontroller and ScrollView is always at least 1, so the object with the strong pointer is not destroyed, which results in a memory leak. S

Tomcat Boot error: critical: standardserver.await:create[8005] Java.net.BindException:Cannot Assign requested address

Tomcat Start errororg.apache.catalina.core.StandardServer await severe:standardserver.await:create[ 8005 ]: Java.net.BindException:Cannot Assign requested address Java.net.BindException:Cannot Assig N Requested address at Java.net.PlainSocketImpl.socketBind (Native Method) at Java.net.PlainSocketImpl.bind (P LainSoCketimpl.java:365) at Java.net.ServerSocket.bind (Serversocket.java:319) at Java.net.ServerSocket.) at org.apache.catalina.core.StandardSer

Mysql database Add users and assign permissions to implement _mysql

Create users and assign permissions; Copy Code code as follows: Insert into Mysql.user (Host,user,password) VALUES ("localhost", "Phplamp", Password ("1234"))//create User Grant all privileges in dbname.* to ' username ' @ '% ' identified by ' password ';//create user and assign all permissions Grant Select,update on phplampdb.* to phplamp@localhost identified by ' 1234 ';///create user and

A workaround for using AJAX to assign a global variable failure exception in jquery _jquery

We're using jquery ajax to extract the data from the background after we want to assign it to the global variable, but how can not be assigned, why? The reason is actually very simple, we use the AJAX is asynchronous operation, that is, in your assignment when the data has not been extracted, you certainly do not, so as long as the change to sync operation on the line ~ Method 1: Set up synchronization to perform AJAX operations first Set Ajax

TIME_WAIT caused cannot assign requested address error

1. Description of the problem Sometimes use Redis client (PHP or Java client) to connect Redis server, error: "Cannot assign requested address." ” The reason is that clients frequently connect to the server, because each connection in a very short time end, resulting in a lot of time_wait. So the new connection has no way to bind the port, that is, "Cannot assign requested address". We can go through Netst

Questions about using the Kvm-pci-assign Iommu

One kernel configuration According to the book on the configuration of the kernel, the BIOS also started the IOMMU, but no matter how to get all appear "qemu-system-x86_64 no IOMMU found. Unable to assign device "error. This is because the latest kernel, it is recommended to abolish the kvm_assign mechanism, only support Vfio, if you still use the old KVM assign, then you need to manually modify the. config

How to use PowerShell to bulk assign licenses to Office 365 users

Recently a customer asked, using ad synchronization, to create a batch of hundreds of users for Office 365, who need to manually assign licenses to them on the web side?----------------------------------------------------Assigning licenses to users one at a time in the Administrator Portal page is a method, but the workload of mechanical labor can be large when the user volume is large. This article recommends a method for bulk allocation of licenses

How to empty the contents of a JTextArea or assign a value with another string, how to set it to be non-editable

How to empty the contents of a JTextArea or assign a value with another string. And how to set it to be non-editable. 1. How to empty the contents of the JTextArea or assign values with other strings. And how to set it to be non-editable. There are no such methods in the class, only one Replacerange (String str, int start, int end), but that end seems ve

Assign, strong, copy

For example: Nsstring * houseofmm = [[nsstring alloc] initwithstring: 'Three-bedroom, two-bedroom with up to fans']; The above code executes the following two actions:1. Allocate a block of memory on the heap to store @ 'three-bedroom and two-bedroom with a fan id', for example: the memory address is 0x1111 and the content is 'three-bedroom and two-bedroom with up to fans ',2. Allocate a piece of memory on the stack to store houseforwife. For example, if the address is 0, the content of xaaaa is

How to assign a value to a custom variable when entering a URL in the browser and the returned data?

In the browser, enter a URL and the returned data. how do I assign a value to a variable defined by myself? In the browser, enter a URL and the returned data. how do I assign a value to a variable defined by myself? For example, I enter a Web site http://test.com/abc? Abc = 123 then the browser saw 123321. I entered a URL in the browser and returned data. how do I assig

Assign,copy,strong,weak,nonatomic's Specific understanding

NSString *HOUSEOFMM = [[NSString alloc] initwithstring: ' mm of three rooms and two halls '];The preceding section of code performs the following two actions:1 Allocate a piece of memory on the heap to store the @ ' mm of the three-room two halls ', for example: memory address of 0x1111 content is ' mm of the three-room two halls ',2 Allocate a piece of memory on the stack to store Houseforwife, for example: 0XAAAA content is naturally 0x1111See below (assig

Property Settings @property retain,assign,weak,strong,copy

1.assignAssign is simply assigned, does not change index count, applies to underlying data types (such as nsinteger,cgfloat) and C data types (int, float, double, char, etc.)2.copyCopy is used to create an object with an index count of 1, and then release the old object, common language nsstring, which refers to a copy of the passed-in value when the value is assigned.3.retainThe retain is used to release the old object, assign the value of the old ob

From a weak reference to the crash talk weak assign strong application Scenario "iOS development tutorial"

Method One of the definitions in. h:@property(nonatomic,assign)NSArray*dataSource;Define method Two@property(nonatomic,strong)NSArray*dataSource;How to implement in. m- (void)Viewdidload { [Super Viewdidload]; if (YES) { Nsarray *array = @[@ "1", @ "2", @ "3"]; Self.datasource = Array; } if (Self.dataSource.count > 2) { NSLog (@ "Self.datasource can I print?" Can print instructions can be defined as

How to assign cell data to an array by "VBA research"

IamlaosongThere are two general ways to assign data from a worksheet to an array or to assign data from an array to a worksheet. One is a cyclic method, one of which is commonly used in situations where each data is specially handled, and one is transmitted at a time with an assignment statement, and the other is much faster in terms of speed. Look at the following routines:sub tt () Dim arr1 (240000, 4)

The difference between Assign,copy,retain in iOS and the difference between weak and strong

@property (nonatomic, assign) NSString *title;What is the difference between assign,copy,retain?Assign: Simple assignment, without changing the index count (Reference counting).Copy: Create an object with an index count of 1 and then release the old objectRetain: Frees the old object, assigns the value of the old object to the input object, and then increases the

[InfoPath] uses jquery to assign a value to an Infopath form's field. How to set value to Infopath field by Jquery

The customer has a need to embed a piece of our own in an InfoPath form, and to update an InfoPath field after the calculation.1. How to get to that fieldBecause the HTML produced by InfoPath is very complex, nested too much, followed by a messy ID, and when editing and viewing the ID is different, but each field in the HTML has a property called ' Originalid ', this ID is relatively fixed. So you can use this property to get the appropriate control.For example: $ ("input[originalid= ' V1_i1_t9

The difference between Ios-strong and assign

OC in iOS is an object-oriented editing language, each object is an instance of the class, and in OC each object has a pointer to the object named Isa, which points to its class. All nsobject are a struct that contains the ISA pointer. (1) Assign and weak are a weak reference;(2) strong is strongly quoted;Weak references and strong references in the process of referencing the most important is caused by memory changes, and memory management, in the Se

iOS Memory Management Retain,assign,copy,strong,weak

set to nil after usemember variables and propertiesIt's not as simple as it is, you might need to call another function to assign a variable in one function.There are two choices: class member variables and usage properties@interface Testmem:nsobject {Testobject *m_testobject; Member variablesTestobject *testobject; Member variables}The member variables are consistent with the memory management above, but the balance of reference count plus and minus

Delegate assign weak should use which, avoid exc_bad_access

Label:Only consider the ARC environment: Write your own delegate, use weak, not assign.The difference between weak and assign is that the weak pointer is automatically set to nil when the object being pointed to is released. The Assign pointer points to an invalid address. In an asynchronous environment, you often encounter asynchronous callbacks when calling delegate's callback method, [Self.delegate Call

How to assign permissions to mysql in win System

How to assign permissions to mysql in win System How to assign permissions to mysql in win SystemCreate userCreate a user named mysqlusr and set a random password. The password length is the best.No less than 20 characters. 2. Set the user's identityAdd the mysqlusr user to the Guests group and remove any other group. 3. Set disk PermissionsAssume that MySQL is installed in the following directory:D: hostin

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