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SeaEpoch Blog

website·Indexed 31 days ago

https://seaepoch.com

A technical blog featuring tutorials and articles on C++ programming, Win32 API, algorithm implementations like KMP and TOPSIS, and Hexo blog customization using the Matery theme. Content covers topics such as character set encoding, memory analysis, and software configuration.

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What's inside SeaEpoch

  1. Overview of the TOPSIS Method

    TOPSIS (Technique for Order Preference by Similarity to Ideal Solution), also known as the 'distance to the ideal solution' method, is a comprehensive evaluation method used to rank alternatives. It utilizes original data to precisely reflect the gaps between different evaluation schemes by calculating how close a solution is to the ideal best and furthest from the ideal worst.

  2. Overview of C++ Standard Template Library (STL) Components

    The C++ Standard Template Library (STL) is a powerful library of generic classes and functions. It is primarily composed of three core components:

    1. Containers: Template-based data structures such as arrays, linked lists, queues, heaps, stacks, and trees. They are designed to handle various data types via template parameters.
    2. Algorithms: System functions for common operations including adding, deleting, modifying, searching, and sorting.
    3. Iterators: Pointer-like objects that act as a bridge between containers and algorithms, allowing ordered movement through container elements. This is the foundation for all STL functionality.

    Additionally, the STL includes other utilities such as strings and input/output streams.

  3. Overview of the TOPSIS Method

    TOPSIS (Technique for Order Preference by Similarity to Ideal Solution), also known as the 'distance to ideal solution' method, is a comprehensive evaluation method used to rank multiple alternatives. It utilizes original data to precisely reflect the gaps between different evaluation schemes by calculating the distance of each alternative to the ideal best and worst solutions.

  4. Overview of the ConsoleMenu C++ Library

    The ConsoleMenu library is designed for beginners to implement keyboard-controlled console menus in C++, moving away from traditional standard input (std::cin) patterns to create a more game-like navigation experience in a command-line interface. This is particularly useful for academic course projects or simple console applications.

  5. Overview of C++ Standard Template Library (STL) Components

    The C++ Standard Template Library (STL) is a powerful library of generic classes and functions. It consists of three primary components:

    1. Containers: Implement common data structures such as arrays, linked lists, queues, heaps, stacks, and trees. These are templated to support various data types.
    2. Algorithms: Provide system functions for common operations like adding, deleting, modifying, searching, and sorting.
    3. Iterators: Act as a bridge between containers and algorithms. They function similarly to pointers, allowing algorithms to traverse and manipulate elements within a container regardless of the container's internal structure.

  6. Package a Qt QML application on Windows

    Packaging QML applications requires an additional flag to specify the QML source directory. Ensure the project is built in Release mode and the architecture matches the target environment.

    Steps:

    1. Build the project in Release mode.
    2. Copy the executable and dependencies into a new deployment directory.
    3. Open the Qt CMD tool as an Administrator.
    4. Navigate to the deployment directory using cd.
    5. Run windeployqt with the -qmldir flag.

    Critical Note: The YOUR_QML_SOURCES_DIR must be the path to the folder containing your entry QML file (or where qml.qrc is located), NOT the Qt installation directory.

    cd "YOUR_PATH"
windeployqt.exe YOUR_PROGRAM_NAME.exe -qmldir YOUR_QML_SOURCES_DIR

  7. Utilize standard C/C++ predefined identifiers and macros

    C/C++ provides built-in predefined macros and identifiers that provide information about the compilation environment, source file, and current function.
    // Common Predefined Identifiers/Macros:
// __func__      : Name of the current function (local static const char array)
// __FILE__      : Full path/name of the current source file (string)
// __LINE__      : Current line number (integer)
// __DATE__      : Compilation date in "Mmm dd yyyy" format
// __TIME__      : Compilation time in "hh:mm:ss" format
// __cplusplus   : Defined as an integer representing the C++ standard version

  8. Contact the SeaEpoch site administrator

    The site administrator can be reached via email or through the site's messaging system on the 'About' page or other relevant pages.
    Email: seaepoch@outlook.com

  9. Reference QProcess signals for process management

    QProcess uses a signal-based model to notify the parent application about the lifecycle and data output of a child process. The following signals are used to track process state, handle output streams, and capture system-level errors:
    | Signal | Purpose | Trigger Timing | Information Provided | Key Distinction |
| :--- | :--- | :--- | :--- | :--- |
| started() | Marks successful start | After start() successfully creates the child process | None | Indicates start success; does not imply output or completion |
| stateChanged() | Process state change notification | When state switches between NotRunning, Starting, or Running | Current state | Lowest-level state signal; observes full lifecycle |
| readyReadStandardOutput() | Receive standard output | When child process writes to stdout (may trigger multiple times) | stdout data | For normal output; data arrives in chunks |
| readyReadStandardError() | Receive error output | When child process writes to stderr (may trigger multiple times) | stderr data | Not necessarily a failure; just indicates stderr stream output |
| finished() | Process termination notice | When process exits (success or failure) | exitCode / exitStatus | Lifecycle endpoint; used for result convergence |
| errorOccurred() | Capture process-level exceptions | Start failure, crashes, IO errors, etc. | Error type | System-level errors only; does not include application logic errors |

  10. Reference QProcess signals for process management

    QProcess uses a signal-based model to notify the parent application about the lifecycle and data output of a managed sub-process. The following signals are used to track process state, read output, and handle errors:
    | Signal | Purpose | Trigger Timing | Information Provided | Key Distinction |
| :--- | :--- | :--- | :--- | :--- |
| started() | Marks successful start | After start() successfully creates the sub-process | None | Indicates start success; does not imply output or completion |
| stateChanged() | State change notification | When switching between NotRunning, Starting, or Running | Current state | Lowest-level state signal; observes full lifecycle |
| readyReadStandardOutput() | Receive standard output | When sub-process writes to stdout (may trigger multiple times) | stdout data | For normal output; data arrives in chunks |
| readyReadStandardError() | Receive error output | When sub-process writes to stderr (may trigger multiple times) | stderr data | Not necessarily a failure; only indicates stderr stream output |
| finished() | Process termination notice | When the process exits (success or failure) | exitCode / exitStatus | Lifecycle endpoint; used for result convergence |
| errorOccurred() | Capture process-level exceptions | Start failure, crashes, IO errors, etc. | Error type | System-level errors only; does not include application logic errors |

  12. Understand factors affecting C++ class memory size

    The memory size of a C++ class (determined via sizeof) is influenced by several factors:

    • Member Variables: Each non-static member adds to the size based on its type and memory alignment.
    • Static Member Variables: These are shared across all instances and are stored outside the object; they do not increase the size of individual class instances.
    • Member Functions: Regular and static member functions are shared and do not affect the object's memory size.
    • Virtual Functions: If a class contains virtual functions, the compiler adds a virtual function table pointer (vptr). This adds 4 bytes on 32-bit systems and 8 bytes on 64-bit systems.
    • Memory Alignment: The compiler adds padding to ensure data is accessed efficiently, which can increase the total size of the class.