A multi-threaded asynchronous Socket packet receiver framework implemented by C# (1)
Reprinted from zhonghuafy //from http://www.cnblogs.com/wcfgroup/archive/2008/10/06/1304512.html I saw a C# Socket question in a blog a few days ago, and I thought of a provincial traffic flow receiving server project I made in 2004. The basic requirements at that time were as follows: Receive traffic data packets reported by automatic observation equipment through wireless network card, Internet and Socket The automatic observation equipment running 365*24 throughout the year reports the observation data every 5 minutes, and each record is about 2K in size It is planned that there will be about 100 automatic observation devices in the province (as of October 2008, there are only 30) At that time, VS2003 had only been released for more than a year, and the author also came into contact with C# not long ago. So Google searched domestic and foreign websites, hoping to find some ideas and codes for using C# to solve Socket communication problems. Finally, I found two most helpful articles: one is a Socket receiver framework written by a Chinese, which applies the concept of an independent client Socket session (Session), and provides the author with an overall framework idea for receiving a server; the other It was written by an…
Python original root generation algorithm, python snowflake algorithm to generate id
List of contents of this article: 1. What are the python algorithms 2. What are the simple algorithms in python? 3. PYTHON’s data structure and algorithm introduction 4. There are three steps in python algorithm design They are What are the python algorithms Python algorithm features 1. Finiteness: The finiteness of the algorithm means that the algorithm must be able to terminate after executing a finite number of steps; 2. Exactness: each step of the algorithm must have an exact Definition; 3. Input items: an algorithm has 0 or more inputs to describe the initial situation of the operation object. The so-called 0 input means that the algorithm itself has set the initial conditions; 4. Output item: An algorithm has one or more outputs to reflect the result of processing the input data. An algorithm without output is meaningless; 5. Feasibility: Algorithm Any calculation steps performed in can be decomposed into basic executable operation steps, that is, each calculation step can be completed within a limited time; 6. Efficiency: fast execution speed, resource-occupied Less; 7. Robustness: The data response is correct. Python algorithm classification: 1. Bubble sort: It is a simple and intuitive sorting algorithm. Repeatedly visited the array to…
Read CLRviaC# to talk about generics in detail
1，What is generic?Answer ：Generic is a template of type ，Type is a template of instance (object). C# provides 5 kinds of generics: class ， interface ， delegate ， structure and method. 2，What are the benefits of using generics?？Answer：Inheritance implements “code reuse”, while generics implement Another form of code reuse，is “algorithm reuse”. To sum up, there are the following advantages ： 1> Improve code reusability. 2> Type safety at compile time. When using an incompatible type ， will report an error at compile time， instead of waiting until runtime to report an error， improves type safety. 3> Better performance. When manipulating value type instances ，Using generics will reduce value type boxing，This will result in less memory allocation on the program’s managed heap，Garbage collection is less frequent， This can improve program performance. Using a generic class instance The following is an example of using generics to implement a stack ， Main method defines two variables ， stackInt and stackString. Instances (objects) of these two constructed types are created using int and string as type arguments. The code is as follows ： 1 namespace GenericDemo1 2 { 3 //Define a generic class 4 class MyStack 5 { 6 T[] StackArray;/ //declare array reference…
The win7 wifi server does not respond, win7 system turns on wifi and prompts you to lack a wireless network card 3 solutions
When the win7 system computer turns on the wifi, it prompts “You lack a wireless network card， Please choose the following method to open free WIFI”，as shown in the figure below： Solution 1： Make sure the computer is installed with wireless Network card 1. First, make sure that the computer has installed a wireless network card. ，View method，On the desktop，Click My Computer，Right click to pop up the menu， Select Management ； 2. After entering the management ， click on the device manager ， in the device manager ， find the network adapter ， check whether the wireless network card driver wireless exists ； 3. If already Installed & # xff0c; please select the wireless network card driver & # xff0c; and then right-click the pop-up menu & # xff0c; select uninstall & # xff0c; uninstall the driver & # xff0c; skip if the wireless network card is not installed. Solution 2. ： 1. On the toolbar in the lower right corner ， there will be a wireless connection icon ， if you cannot access the Internet ， what you need to do is fault diagnosis and fix ， left mouse click directly on the wireless icon. 2. Right-click on the…
Laravel Relationships and Pivot Tables
I’m developing my first laravel app and now I’m creating some relationships for my content types. In the app, I can create an appointment which in the process will also save the details and create a new client. But I want my users to be able to see their customer’s “history” and see all the appointments they have booked. So far, I’ve added a hasMany relationship to my client model, and a hasOne inverse to the appointment model. So, my thinking so far is that a customer can have multiple appointments, but an appointment can only have one customer. But… I’m really having a hard time connecting the two together because ideally I need to do the following:- For X customer id, get all appointments that match a customer id Where would you use a pivot table to manage in this case? If so, where do you put the logic to handle attaching/unattaching the IDs in the model? Or I’m missing something in my call because my appointment function in my client model has only this:- return $this->hasMany(‘ App\Appointment’); Is there anything else I need to pass? I’ve read the docs and am clueless, and coming from a WP background,…
Assembly Experiment 3 Debugging and Running of Assembly Language Program
One. Purpose of the experiment 1. Proficiency in the basic framework of writing assembly language original programs2. Familiar with the process of editing, assembling, linking, debugging and running assembly language programs on PC. Two. Experiment content The brief process of an assembly language program from writing to final execution is as follows: 1) EditingYou can use any text editor to edit the source program, as long as it is finally stored as Plain text files will do. Generally save as *.asm file. 2) Compilation In the computer process, we use Microsoft’s masm5.0 assembly compiler, and the file name is masm.exe. Our compiler is in the C:\masm5 directory, and the source program can be compiled according to the following process, taking C:\1.asm as an example: Enter the DOS mode, enter the C:\masm5 directory, and run masm.exe, first displays some version information, and then prompts for the name of the source program file to be compiled. When inputting the file name of the source program, the path must be specified. If the file is in the current path, just input the file name, otherwise, input the full path. Here, we enter C:\1.asm. After entering the source program file name, the program continues…
Is there something like python__dict__ in Julia?
Python has dict, doc, init, etc. Does Julia have something similar? How do I know the function names of a Julia package? Answer Use the names function to get a list of all the names exported by a module (since that’s what I assume you’re looking for). Note that the list will specifically include: functions, types, variables and other modules. Here’s an excerpt from its docstring that gives you more details: names(x::Module; all::Bool = false, imported::Bool = false) Get array of names exported by a Module, excluding deprecated names. If all is true, the list also includes non-exported, deprecated, and compiler-generated names defined in the module. If imported is true, names explicitly imported from other modules are also included. Due to Julia design, you should be aware of two issues: Some packages choose not to export names, but assume they should always be qualified ; this is e.g. the case of the CSV.jl package Objects other than functions can be called in Julia (types can be called as constructors, variables can be turned into functors) Answer except for function names for modules (e.g. names(Gadfly)). If you want to get all properties of an object, there are two functions: fieldnames –…
Connect to SQLServer2012 database in Eclipse
Download SQL Server driver Address: https://www.microsoft.com/zh-CN/download/details.aspx?id=57782 Run the exe file to put Go to a directory Open JAVA project Click Project–》 properties–》Libraries–》Add External JARs… Select the version according to the demand group I use 11.0, so I chose the 11.0 version Select Then click Apply and Close Driver imported successfully for connection test public static void main (string [] args) throws exception { String drivename = & # 8221; com.microsoft.sqlserver.jdbc.Sqlserverdriver & # 8221;; String dburl = & #8221;jdbc:sqlserver://localhost:1433;DatabaseName=ET_Lock;;integratedSecurity=true;”; String userName=”sa”; String userPwd=”123456″; try { Class.forName(driverName); Connection cOnn=DriverManager.getConnection(dbURL,userName,userPwd); System.out.println(“Connect to database successfully”); } catch(Exception e) { e.printStackTrace(); System.out.print(“Connection failed”); p> } } }
Resume: proficient and familiar with
Use proficient, proficient, familiar, and understanding in this article to indicate your mastery of a certain technology. Proficient：can master more than 85% of the technical points of this technology，use this technology for more than two years，and successfully implement it 5+ items. This technique can be used to optimize performance or code，to maximize possible reuse. Proficient：Able to master more than 60% of the technical points of this technology，Use this technology for more than one year，and successfully implement it 3+ items. Can use this technology to realize software requirements and accumulate experience. Before implementation, optimize design and realize module or code reuse as much as possible. Familiar with：can master more than 50% of the technical points of this technology，use this technology for more than half a year，and successfully implement it 1 or more items. Software requirements can be implemented using this technique. Understand： You can refer to technical documents or help files to meet your needs when you actually need it，Basically know the role of this technology in your use Function ， can call or use the calling method provided to you according to the regulations. or Definition of understanding, familiarity, mastery, mastery: “Understanding” ， is the knowledge that needs to be…
