解析十六进制雷达数据格式：解析雷达数据长度。

以Cat62格式雷达数据为例，十六进制雷达数据部分代码：

3e0120bf7da4ffee0085

雷达数据长度使用4个字符（2个字节）标识，在这里是“0120”，转换为十进制数为288。

雷达数据长度父类：

base_length_processor.h

//
// Created by qiaowei on 2024-02-02.
//

#ifndef RADARDATACONTROLLER_BASE_LENGTH_PROCESSOR_H
#define RADARDATACONTROLLER_BASE_LENGTH_PROCESSOR_H


#include 


namespace processor {

    class BaseLengthProcessor {

    public:
        virtual int processor(const QString& track_data,
                              int begin_position_index,
                              int& readed_data_end_position) = 0;
    };

} // processor

#endif //RADARDATACONTROLLER_BASE_LENGTH_PROCESSOR_H

cat_62_length_processor.h

//
// Created by qiaowei on 2024-02-02.
//

#ifndef RADARDATACONTROLLER_CAT_62_LENGTH_PROCESSOR_H
#define RADARDATACONTROLLER_CAT_62_LENGTH_PROCESSOR_H


#include 
#include 

#include "../baseprocess/base_length_processor.h"


namespace processor {

    class Cat62LengthProcessor : public QObject, public BaseLengthProcessor {

    public:
        explicit Cat62LengthProcessor(QObject* parent = nullptr);

        virtual ~Cat62LengthProcessor() override;

        /**
         * @author  qiao wei
         * @brief   获取Cat62格式雷达数据长度。返回值单位为字节（注意字符串中字节与字符索引区别）。
         * @param   track_data 雷达数据。
         * @param   begin_position 雷达数据中保存雷达长度的字符串首字符索引。
         * @param   readed_data_end_position 雷达数据中保存雷达长度的字符串末字符索引。
         * @return  返回该雷达数据的字节数量。雷达数据不完整时返回-1。
         * @history
         */
        virtual int processor(const QString& track_data,
                              int begin_position,
                              int& readed_data_end_position) override;
    };

} // processor

#endif //RADARDATACONTROLLER_CAT_62_LENGTH_PROCESSOR_H

cat_62_length_processor.cpp

//
// Created by qiaowei on 2024-02-02.
//


#include "cat_62_length_processor.h"


namespace processor {

    Cat62LengthProcessor::Cat62LengthProcessor(QObject* parent) : QObject(parent) {}

    Cat62LengthProcessor::~Cat62LengthProcessor() {}

    int Cat62LengthProcessor::processor(const QString& track_data,
                                        int begin_position,
                                        int& readed_data_end_position) {
        // 初始化索引。长度项初始位索引赋值给长度项末尾索引。
        readed_data_end_position = begin_position;

        // 读取雷达数据的字节长度。字节长度为字符长度的一半。保存雷达数据长度的字符有4个，2个字节。
        const int track_data_length{track_data.mid(begin_position, 4).toInt(nullptr, 16)};

        // 雷达数据中数据长度项最后一位字符的索引。
        readed_data_end_position = begin_position + 4 - 1;

        if (track_data_length == track_data.length() / 2) {
            return track_data_length;
        } else {
            // 雷达数据不完整返回-1。
            return -1;
        }
    }

} // processor

main.cpp

#include 

#include 
#include 
#include 
#include 

#include "./form/main_window.h"
#include "./cat62process/cat62_fspec_processor.h"
#include "./cat62process/cat_62_length_processor.h"
#include "./cat62process/cat_62_header_processor.h"


using std::string;

using form::MainWindow;
using processor::Cat62FspecProcessor;
using processor::Cat62HeaderProcessor;
using processor::Cat62LengthProcessor;


int main(int argc,
         char *argv[]) {
    QApplication a(argc, argv);

//    MainWindow* main_window{new MainWindow{nullptr}};
//    main_window->show();

    QString content = "3e0120bf7da4ffee0085988";

    int begin_position{0};
    int end_position = begin_position;
    Cat62HeaderProcessor* header_processor{new Cat62HeaderProcessor{}};
    qDebug()<< header_processor->processor(content, begin_position, end_position);

    begin_position = end_position + 1;
    Cat62LengthProcessor* lenght_processor{new Cat62LengthProcessor{}};
    qDebug()<< lenght_processor->processor(content, begin_position, end_position);

    begin_position = end_position + 1;
    Cat62FspecProcessor* fspec_processor{new Cat62FspecProcessor{}};
    QVector* vector = fspec_processor->processor(content, begin_position, end_position);

    for (int index = 0; index < vector->capacity(); ++index) {
        qDebug()<< index << ": " << vector->at(index) << ", ";
    }

    int i{20};

    return QApplication::exec();
}

运行结果：