Found a total of 10000 related content
How to evaluate the quality of XML conversion to images?
Article Introduction：The quality evaluation of XML to pictures involves many indicators: Visual fidelity: The picture accurately reflects XML data, manual or algorithm evaluation; Data integrity: The picture contains all necessary information, automated test verification; File size: The picture is reasonable, affecting loading speed and details; Rendering speed: The image is generated quickly, depending on the algorithm and hardware; Error handling: The program elegantly handles XML format errors and data missing.
2025-04-02
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434
What is fuzz testing in C?
Article Introduction：Fuzz testing is an effective automated testing technology in C for discovering errors and vulnerabilities in software. 1) By inputting random or semi-random data, observe the program response and detect the performance of unexpected input. 2) It is especially suitable for C, which can expose memory leaks and buffer overflows. 3) Use tools such as libFuzzer and AFL to automatically generate test cases and execute tests.
2025-04-28
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509
How to select a random row from a SQL table?
Article Introduction：To randomly select a row from a SQL table, it can be achieved through database built-in functions and query techniques. 1. Use ORDERBYRAND() LIMIT1 to be used for MySQL and SQLite. Random numbers are generated through RAND() and the first one is sorted, but the performance is poor when there are large data volumes; 2. PostgreSQL uses the RANDOM() function instead of RAND(); 3. Improve efficiency and random selection can be made based on the primary key range. First get the maximum primary key value, and then generate the first record that is greater than or equal to the random number to query the first record that is greater than or equal to the value to avoid the whole table sorting but may lead to uneven probability; 4. Notes include uneven primary key distribution affecting uniformity, suggesting regular statistical distribution, cache random values, or processing at the program level. According to database type and
2025-07-03
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753
This Week in Windows: Better File Search, Photos Updates, and More
Article Introduction：New features and improvements to Windows 11: voice summary, Copilot enhancement, picture editing, etc.
The latest update to Windows 11 brings several improvements, covering accessibility, Copilot integration, image editing, and file search. Let's take a look at these exciting new features together.
Voice summary function of Narrator
The built-in screen reader for Windows, the narrator, now has the new "voice summary" feature. This feature allows users to quickly access voice content through simple keyboard shortcuts, track real-time transcription, and copy what the narrator has said recently. Users can use the Narrator key Alt X to open voice extraction
2025-04-01
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1026
how to save an excel chart as an image
Article Introduction：Want to save Excel charts as pictures? The most direct method is to right-click the export, select the chart and right-click to select "Save As Picture", which supports PNG, JPEG and other formats. It is simple to operate and suitable for saving single pictures; secondly, you can copy the chart (Ctrl C) and paste (Ctrl V) into Word or PPT, and right-click to save as a picture in the target program for further editing; if you need to quickly capture some areas, you can use system screenshot tools such as Win Shift S for Windows or Cmd Shift 4 for Mac, but the clarity is limited, and it is suitable for temporary use. Choose the appropriate method according to your needs. It is recommended to give priority to using right-click export to ensure quality in formal scenarios.
2025-07-10
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442
How to use the Snipping Tool in Windows 10?
Article Introduction：To use the SnippingTool screenshots that come with Windows 10, you can first open the program through the Start menu search or run the command; secondly, click "New" to select four screenshot modes (rectangle, window, full screen, free) to take screenshots; after taking screenshots, you can use brush, highlight, eraser and other tools to mark them; finally save the picture through the file menu; in addition, you can also use the Alt PrintScreen shortcut key to screenshot the current window; if you need more functions, you can try the Snip&Sketch tool.
2025-07-15
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935
Go Web Scraping and Data Extraction
Article Introduction：To use Go to write web crawlers and data extraction programs, you need to pay attention to four core links: sending requests, parsing HTML, extracting data, and dealing with anti-crawling strategies. 1. It is recommended to use net/http packages or third-party libraries such as colly and goquery when initiating HTTP requests. Pay attention to setting User-Agent and random delays. 2. Parsing HTML commonly used goquery (similar to jQuery syntax) or golang.org/x/net/html (standard library parser). 3. When extracting data, it is recommended to locate elements through class name or ID, and dynamic content can be processed by chromedp. 4. Anti-crawl response strategies include using proxy IP pools, setting reasonable request intervals, simulated login and using Head
2025-07-16
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262
JVM Internals: Java JIT Compiler Optimizations
Article Introduction：JVM's JIT compiler improves program performance through a variety of optimization methods. 1. Method inline: Copy small methods frequently called directly to the calling point to reduce the calling overhead. 2. Escape analysis and scalar replacement: analyze the scope of the object, avoid heap memory allocation, and use stack allocation or disassembly into basic variables. 3. Loop optimization: including loop expansion, common subexpression extraction and dead code elimination to improve loop execution efficiency. 4. Type guessing and devirtualization: Optimize virtual method calls based on runtime type information to reduce dynamic binding overhead. These optimizations reduce redundant operations, memory overhead, and control flow complexity, making Java programs more efficient.
2025-07-17
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488
How to perform data analysis with Debian Strings
Article Introduction：This article discusses how to use string data in the Debian system for analysis. Although I have not found special tools or methods for "DebianStrings Data Analysis", we can use some common data analysis techniques and tools to process this type of data. Data Analysis Methods and Tools In the Debian system, string data may exist in various files, such as log files, configuration files, or program output. In order to perform effective analysis, we need to choose the appropriate tool and method: Data extraction: First, we need to extract string data from the relevant files. You can use command line tools such as grep, awk, sed, etc. for filtering and extracting. For example, grep-oE'[a
2025-04-12
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693
What is the declaration form of a c language function
Article Introduction：Function declaration defines the interface of the function, including the return value type, function name and parameter list, which is used by the compiler to check whether the function calls in the code are correct and avoid runtime errors and program crashes. Specifically, signatures include: return value type, such as int, which means returning an integer. Function names, such as add, should be meaningful and follow the naming rules. Parameter list, separated by commas, specifying type and quantity. Pointer parameters, such as const char *str, are used to accept constant pointers to character arrays. Multiple parameters, such as three double types, are used to calculate the average value. No parameters, used to generate random numbers, etc.
2025-04-03
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757
how to zoom in on Premiere Pro
Article Introduction：There are many ways to enlarge the picture in PremierePro. 1. Use the "Scaling Tool" (shortcut key Z) to enlarge the view of the timeline; 2. Press and hold the Alt (Windows) or Option (Mac) keys and scroll the mouse wheel, or adjust the preview screen scale through the zoom drop-down menu in the lower right corner of the "Program Monitor"; 3. Modify the "Scaling" value in the "Motion" option of the "Effect Control" panel to add keyframes to create animation effects; 4. nest the sequence and apply a unified zoom value to the entire sequence, which is suitable for overall zooming of multiple layers or complex synthesis. Each method is suitable for different scenarios, and reasonable choice can improve editing efficiency.
2025-07-10
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163
How to Plant Coins in Mario Kart World to Unlock Every Car
Article Introduction：To unlock all vehicles in Mario Kart, you will need to collect 3,000 coins in total. A new kart can be unlocked for every 100 coins you get—and only about 25 coins per game, and the process can be quite long. If you want to unlock all within an hour, there is actually a more efficient way to quickly swipe coins. In free roaming mode, there will be some random refresh vehicles, which will drop a large number of coins every few seconds. As long as you follow these "coin cars", you can continuously obtain coins. Although you must stay in driving and cannot hang up and swipe coins offline, this method can allow you to unlock all vehicles within half an hour. Open your favorite podcast program and listen to it while easily brushing coins.
2025-06-11
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253
how to fix mouse cursor changes on its own
Article Introduction：The random change of the mouse pointer is usually caused by driver exceptions, system settings errors or third-party software interference. 1. Incompatible or corruption of the mouse driver is a common cause. You can check whether the mouse device in the device manager has a yellow exclamation mark. After uninstalling, reinstall the official driver; 2. Third-party mouse drivers or configuration tools may cause conflicts, and it is recommended to temporarily close or uninstall relevant software; 3. The error of "changing pointer scheme" in the system settings will also lead to problems. You can switch the solution back to "Windows default (standard)" through the control panel; 4. Remote desktop or virtual machine software may cause style residues, so you can reset it manually; 5. Optimization tools, screen recording software and even viruses may also affect the behavior of the pointer. You need to check the background program one by one and perform anti-virus scanning.
2025-07-17
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289
