Qt浅谈之五十二显示shape表格并自动搜索图片

蔚落 2023-05-31 10:08 31阅读 0赞

# 一、简介 #

Qt版本（Qt\_5\_9\_5\_MinGW\_32bit，Qt更高版本是64位需要编译第三方64位库）下，加载shape文件并显示，然后点击对应的图片字段弹出图片，使用于特殊环境下图片的筛选。同时也要处理显示的中文乱码问题。完整代码已上传csdn。

![20191024145233346.gif][]

# 二、详解 #

## 1、代码 ##

（1）dispalypic.h

#ifndef DISPALYPIC_H
    #define DISPALYPIC_H
    
    #include <QDialog>
    #include "ogrsf_frmts.h"
    
    namespace Ui {
    class dispalypic;
    }
    
    class dispalypic : public QDialog
    {
        Q_OBJECT
    
    public:
        explicit dispalypic(QWidget *parent = nullptr);
        ~dispalypic();
        bool setPath(QString shp_file, QString pic_path);
    
    private slots:
        void slotDoubleClicked(int row, int column);
    
    private:
        bool parse_shp_file();
        QString utf8_to_gbk(const char *source);
    
    private:
        Ui::dispalypic *ui;
        QString m_shp_path;
        QString m_pic_path;
    };
    
    #endif // DISPALYPIC_H

（2）dispalypic.cpp

#include <QDir>
    #include <QProcess>
    #include <QTextCodec>
    #include "dispalypic.h"
    #include "ui_dispalypic.h"
    
    dispalypic::dispalypic(QWidget *parent) :
        QDialog(parent),
        ui(new Ui::dispalypic)
    {
        ui->setupUi(this);
        this->setFixedSize(1600, 800);
        ui->tableWidget->setFixedSize(1600, 800);
        //ui->tableWidget->horizontalHeader()->setStretchLastSection(true);
        //ui->tableWidget->verticalHeader()->setStretchLastSection(true);
        ui->tableWidget->resizeColumnsToContents();
        ui->tableWidget->resizeRowsToContents();
    
        ui->tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
        ui->tableWidget->verticalHeader()->setSectionResizeMode(QHeaderView::Fixed);
        ui->tableWidget->horizontalHeader()->setMinimumSectionSize(100);
    
        ui->tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
        connect(ui->tableWidget,SIGNAL(cellDoubleClicked(int,int)),this,SLOT(slotDoubleClicked(int,int)));
    }
    
    dispalypic::~dispalypic()
    {
        delete ui;
    }
    
    bool dispalypic::setPath(QString shp_file, QString pic_path)
    {
        m_shp_path = shp_file;
        m_pic_path = pic_path;
        return parse_shp_file();
    }
    
    bool dispalypic::parse_shp_file()
    {
        const char *pszDriverName = "ESRI Shapefile"; 
        CPLSetConfigOption( "GDAL_FILENAME_IS_UTF8","NO" );
        CPLSetConfigOption( "SHAPE_ENCODING", "UTF-8");
    
        RegisterOGRShape();
    
        //OGRRegisterAll();
        OGRSFDriverRegistrar* pReg = OGRSFDriverRegistrar::GetRegistrar();
        OGRSFDriver* poDriver = pReg->GetDriverByName(pszDriverName);
        if (!poDriver)
        {
            return false;
        }
        OGRDataSource *poDS = poDriver->Open( m_shp_path.toLocal8Bit().data(), FALSE );
        if (!poDS)  return false;
        OGRLayer *poLayer = poDS->GetLayer(0);
        poLayer->ResetReading();
    
        OGRFeatureDefn *m_FDef = poLayer->GetLayerDefn();
        QStringList header;
        for(int index= 0; index < m_FDef->GetFieldCount(); index++ )
        {
            OGRFieldDefn *m_Field = m_FDef->GetFieldDefn( index );
            //printf( "--------%s", m_Field->GetNameRef() );
            //const char *data = m_Field->GetNameRef();
            QString v_data = utf8_to_gbk(m_Field->GetNameRef());
            header.append(v_data);
        }
        ui->tableWidget->setColumnCount(m_FDef->GetFieldCount());
        ui->tableWidget->setHorizontalHeaderLabels(header);
        //printf( "\n");
    
        poLayer->ResetReading();
    
        OGRFeature *poFeature = NULL;
        int m_record_lines = 0;
        ui->tableWidget->setRowCount(poLayer->GetFeatureCount());
        while( (poFeature = poLayer->GetNextFeature()) != NULL )
        {
            OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
            for(int iField = 0; iField < poFDefn->GetFieldCount(); iField++ )
            {
    //            OGRFieldDefn *poFieldDefn = poFDefn->GetFieldDefn( iField );
    //            printf( "--------%s\n", poFieldDefn->GetNameRef() );
               //根据字段值得类型，选择对应的输出
    //            if( poFieldDefn->GetType() == OFTInteger )
    //                printf( "%d,", poFeature->GetFieldAsInteger( iField ) );
    //            else if( poFieldDefn->GetType() == OFTReal )
    //                printf( "%.3f,", poFeature->GetFieldAsDouble(iField) );
    //            else if( poFieldDefn->GetType() == OFTString )
    //                printf( "%s,", poFeature->GetFieldAsString(iField) );
    //            else
    //                printf( "%s,", poFeature->GetFieldAsString(iField) );
                //QString v_data = QStringLiteral("%1").arg(poFeature->GetFieldAsString(iField));
                QString v_data = utf8_to_gbk(poFeature->GetFieldAsString(iField));
                ui->tableWidget->setItem(m_record_lines,iField,new QTableWidgetItem(v_data));
            }
            m_record_lines++;
            OGRFeature::DestroyFeature( poFeature );
        }
        OGRDataSource::DestroyDataSource( poDS );
        return true;
    }
    
    void dispalypic::slotDoubleClicked(int row, int column)
    {
        QString v_text = ui->tableWidget->item(row, column)->text().trimmed();
        if (v_text.contains("jpg", Qt::CaseInsensitive) || v_text.contains("png", Qt::CaseInsensitive))
        {
            QString v_file = QStringLiteral("%1\\%2").arg(m_pic_path).arg(v_text);
            if (QFile::exists(v_file))
            {
                QProcess::startDetached("C:\\Program Files (x86)\\HDPicViewer\\HDPicViewer.exe", QStringList(v_file));
            }
        }
    }
    
    QString dispalypic::utf8_to_gbk(const char *source)
    {
        QTextCodec::ConverterState state;
        QTextCodec *codec = QTextCodec::codecForName("UTF-8");
        QString text = codec->toUnicode( source, strlen(source), &state);
        if (state.invalidChars > 0)
        {
            text = QTextCodec::codecForName( "GBK" )->toUnicode(source);
        }
        else
        {
            text = source;
        }
        return text;
    }

## 2、编译运行 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RhaXlhbmcxOTg3OTEy_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RhaXlhbmcxOTg3OTEy_size_16_color_FFFFFF_t_70 1][]

# 三、总结 #

（1）上述代码只是为了解决工作中的问题，具体的业务代码需自己扩展。需要下载：HD图片查看器1.2.0.22.ex，图片浏览工具。

（2）完整的代码已上传到csdn上：[https://download.csdn.net/download/taiyang1987912/11914388][https_download.csdn.net_download_taiyang1987912_11914388]  
（3）若有问题或建议，请留言，在此感谢！

[20191024145233346.gif]: /images/20230531/9d712f95f26c4e7cbad600560b84ffe1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RhaXlhbmcxOTg3OTEy_size_16_color_FFFFFF_t_70]: /images/20230531/efbb082afa0f4bc6871427aa39dded89.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3RhaXlhbmcxOTg3OTEy_size_16_color_FFFFFF_t_70 1]: /images/20230531/c3eb8b4f3bcd47f5b5e1b7bdbf324147.png
[https_download.csdn.net_download_taiyang1987912_11914388]: https://download.csdn.net/download/taiyang1987912/11914388