[QT]抄—影像显示实验

QtCreator新建一个Qt Application，命名为ImageView

在项目文件夹下添加gdal库，统一放在ImageView\gdal目录下。

右键单击项目，选择添加库命令，添加gdal_i.lib和头文件路径，完成后可以再ImageView.pro文件中查看:

win32: LIBS += -L$$PWD/gdal/lib/ -lgdal_i

INCLUDEPATH += $$PWD/gdal/include

DEPENDPATH += $$PWD/gdal/include

Main中的代码：

 #include "mainwindow.h"
 #include <QApplication>
 #include <QtGui/QLabel>
 #include <QtCore>

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

         QTextCodec *codec=QTextCodec::codecForName("GBK");
         if(codec==NULL)
             codec=QTextCodec::codecForLocale();

         QTextCodec::setCodecForLocale(codec);
         QTextCodec::setCodecForTr(codec);
         QTextCodec::setCodecForCStrings(codec);

         QTranslator translator(  );
         translator.load( "qt_zh_CN.qm", "." );
         app.installTranslator( &translator );

         QFont font;
         font.setFamily(QString::fromUtf8("\345\256\213\344\275\223"));
         font.setPointSize();
         app.setFont(font);

         CImageDisplayDlg MainWindow;
         app.setActiveWindow(&MainWindow);
         MainWindow.show();

         QString myStylesheet = "QDialog,QMainWindow,QSplitter\
                                {background-color: qlineargradient(x1:,y1:,x2:,y2:,stop: rgb(,,) stop: rgb(,,));}\
                                QMenuBar{background-color: rgb(,,);}";
         app.setStyleSheet(myStylesheet);

         return app.exec();
 }

main

窗体头文件

 /***************************************************************************
 *
 * Time: 2012-05-28
 * Project: 遥感图像显示Demo
 * Purpose: 遥感图像显示Demo
 * Author:  李民录
 * Copyright (c) 2011, liminlu0314@163.com
 * Describe:遥感图像显示Demo
 *
 ****************************************************************************/
 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include "ui_MainWindow.h"
 #include <string>
 using namespace std;

 class GDALDataset;

 QT_BEGIN_NAMESPACE
 class QCheckBox;
 class QComboBox;
 class QLabel;
 class QSpinBox;
 QT_END_NAMESPACE

 class CImageDisplayDlg :
     public QDialog,
     private Ui::ImageDisplayDlg
 {
     Q_OBJECT

 public:
     CImageDisplayDlg(QWidget* parent = );
     ~CImageDisplayDlg(void);

 private:
     bool CheckInputData(const char* pszRaster, const char* pszVector, QString& strMsg);

     private slots:
         void LoadInputRaster();
         void soltApply();
         void OnOK();

 private:
     bool ShowRasterFile();
     void ShowRaster();
 private:
     string m_strInputRaster;
     GDALDataset *m_pDataset;
     double m_dScale;
     int m_iMinx;
     int m_iMiny;
     int m_iMaxx;
     int m_iMaxy;
 };

 #endif /*MAINWINDOW_H*/

CImageDisplayDlg.h

窗体实现

 /***************************************************************************
 *
 * Time: 2012-05-28
 * Project: 遥感图像显示Demo
 * Purpose: 遥感图像显示Demo
 * Author:  李民录
 * Copyright (c) 2011, liminlu0314@163.com
 * Describe:遥感图像显示Demo
 *
 ****************************************************************************/
 #include "MainWindow.h"

 #include <QFileDialog>
 #include <QMessageBox>
 #include <QSettings>

 #include "gdal_priv.h"

 CImageDisplayDlg::CImageDisplayDlg(QWidget* parent)
 : QDialog( parent )
 {
     setupUi(this);

     QObject::connect(buttonBox, SIGNAL(accepted()), this, SLOT(OnOK()));
     QObject::connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
     QObject::connect(pushButtonInput, SIGNAL(clicked()), this, SLOT(LoadInputRaster()));
     QObject::connect(pushButtonApply, SIGNAL(clicked()), this, SLOT(soltApply()));

     labelView->clear();
     m_pDataset = NULL;
 }

 CImageDisplayDlg::~CImageDisplayDlg(void)
 {
     if(m_pDataset != NULL)
     {
         GDALClose((GDALDatasetH) m_pDataset);
         m_pDataset = NULL;
     }
 }

 bool CImageDisplayDlg::ShowRasterFile()
 {
     GDALAllRegister();
     m_pDataset = (GDALDataset*)GDALOpen(m_strInputRaster.c_str(), GA_ReadOnly);
     if (m_pDataset == NULL)
     {
         QMessageBox::information(this,tr("提示"),tr("指定的文件不能打开！"));
         return false;
     }
     //设置投影坐标范围
     int    dataWidth = m_pDataset->GetRasterXSize();
     int dataHeight = m_pDataset->GetRasterYSize();

     double padfTransform[] = {0.0};
     m_pDataset->GetGeoTransform(padfTransform);

     //设置行列号范围
     spinStartCol->setRange(, dataWidth-);
     spinStartRow->setRange(, dataHeight-);
     spinEndCol->setRange(, dataWidth-);
     spinEndRow->setRange(, dataHeight-);

     spinStartCol->setValue();
     spinStartRow->setValue();
     spinEndCol->setValue(dataWidth-);
     spinEndRow->setValue(dataHeight-);

     ShowRaster();
     return true;
 }

 void CImageDisplayDlg::LoadInputRaster()
 {
     QFileDialog::Options options;
     QString selectedFilter;
     QString fileName = QFileDialog::getOpenFileName(this,
         tr("打开原始图像"),
         ".",
         tr("所有文件(*.*);;Erdas Image (*.img);;PCIDSK (*.pix);;GTiff (*.tif *.tiff);;ENVI (*.*)"),
         &selectedFilter,
         options);

     if (!fileName.isEmpty())
     {
         if(m_pDataset != NULL)
         {
             GDALClose((GDALDatasetH) m_pDataset);
             m_pDataset = NULL;
         }

         lineInput->setText(fileName);
         m_strInputRaster = QFile::encodeName( fileName ).constData();

         if(!ShowRasterFile())
         {
             lineInput->setText("");
             m_strInputRaster = "";
         }
     }
 }

 void CImageDisplayDlg::ShowRaster()
 {
     int iStartCol = spinStartCol->value();
     int iStartRow = spinStartRow->value();

     int dataWidth = spinEndCol->value() - iStartCol;
     int dataHeight = spinEndRow->value() - iStartRow;
     int    dataBands =  m_pDataset->GetRasterCount();

     int    band_list[] = {,,};

     m_dScale = dataHeight > dataWidth ? dataHeight : dataWidth;
     int iViewHeight = ;
     m_dScale = iViewHeight/m_dScale;

     int iSize = GDALGetDataTypeSize(GDT_Byte) / ;
     int iScaleWidth = static_cast<int>(dataWidth*m_dScale+0.5);
     int iScaleHeight = static_cast<int>(dataHeight*m_dScale+0.5);

     iScaleWidth = (iScaleWidth*+)/*;

     unsigned char* pBuffer = new unsigned char[iScaleWidth*iScaleHeight*dataBands];
     CPLErr err = m_pDataset->RasterIO(GF_Read, , , dataWidth, dataHeight, pBuffer, iScaleWidth, iScaleHeight,
         GDT_Byte, dataBands, band_list, iSize*dataBands, iSize*iScaleWidth*dataBands, iSize);
     unsigned char* pDataBuffer = NULL;
     if (dataBands >= )
     {
         pDataBuffer = pBuffer;
     }
     else
     {
         pDataBuffer = new unsigned char[iScaleWidth*iScaleHeight*];
         for (int i=; i<iScaleWidth*iScaleHeight*; i++)
             pDataBuffer[i] = pBuffer[i/];

         delete []pBuffer;
     }

     QImage QImg(pDataBuffer, iScaleWidth, iScaleHeight, QImage::Format_RGB888);
     QPixmap pixmap = QPixmap::fromImage(QImg);
     delete []pDataBuffer;

     labelView->setPixmap(pixmap);
 }

 void CImageDisplayDlg::OnOK()
 {
     accept();
 }

 void CImageDisplayDlg::soltApply()
 {
     ShowRaster();
 }

实现文件

编译运行需要将GDAl所有的DLL拷贝到输出目录下。
结果如图：