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Code: Alles auswählen

bool MdiChild::openImage(const QString &fileName)
{
	char character = ' ';;							 
	char fName[1024];

	GDALDataset  *poDataset = NULL;              // GDAL dataset which holds all rasterbands of one image + additional metadata

	GDALRasterBand  *poBand = NULL;           // GDAL raster band which contains all pixels + additional metadata of one band

	GDALRasterBand *ovBand = NULL;
	GDALDataType type;	                         //GDAL data type which describes the pixel storage format / data type
	char *block = NULL;	                          // buffer for storing read image data
	
        int        nXBlockSize = 0, nYBlockSize = 0, n = 0; 
        int        nXBlocks = 0, nYBlocks = 0; 
        int        iXBlock = 0, iYBlock = 0;
    	
	for (int i = 0; i < 1024; i++)						
		fName[i] = '\0';	

	for (int i = 0; i < fileName.size(); i++)	// conversion of selected image file path form QString into unsigned char
	{
		character = fileName.at(i).toAscii();
		fName[i] = character;
	}

	const char* pszFilename = fName; 

    GDALAllRegister();	                                   // register all GDAL image drivers

    poDataset = (GDALDataset *) GDALOpen( pszFilename, GA_ReadOnly );	                                                          // open dataset, modus: read only

    if( poDataset == NULL ) 
    {
		QMessageBox::warning(this, tr("I-MET"),
                                    tr("Reading of file %1 failed.")
                                    .arg(fileName));
		GDALDestroyDriverManager();
		return false;
    }
     
	poBand = poDataset->GetRasterBand(1);                    // retrieve one rasterband from the dataset				
    poBand->GetBlockSize( &nXBlockSize, &nYBlockSize );	   // calculation of tile / block size
	
    nXBlocks = (poBand->GetXSize() + nXBlockSize - 1) / nXBlockSize;
    nYBlocks = (poBand->GetYSize() + nYBlockSize - 1) / nYBlockSize;

	type = poBand->GetRasterDataType();	                   // determination of pixel data type  
	
	n = poBand->GetOverviewCount();	                           // retrieval of number of image pyramide levels
	ovBand = poBand->GetOverview(n-1);						// access of one pyramide level	

    int nXSize = poBand->GetXSize();	                              // retrieval of image width [pixel]
	int nYSize = poBand->GetYSize();	                      // retrieval of image height [pixel]

	block = (char *) CPLMalloc(sizeof(type) * nXBlockSize * BlockSize);

	
	for (int i = 0; i < 10; i++)
	{
		for ( int j = 0; j < 10; j++)
		{
			poBand->ReadBlock(i, j, block);
			imgArray.append(block);
		}
	}	

	ptrCh = (unsigned char*) imgArray.data();
	QImage img(ptrCh, nXBlockSize, nYBlockSize ,QImage::Format_RGB32);		                             // create QImage using read image data

	image = img;

	GDALClose(poDataset);	                              // close data set	

	setCurrentFile(fileName);	                       // set current file name as image window title
    
    return true;

}

Code: Alles auswählen

bool MdiChild::openImage(const QString &fileName)
{
	char character = ' ';;							 
	char fName[1024];
        ...
    	
	for (int i = 0; i < 1024; i++)						
		fName[i] = '\0';	

	for (int i = 0; i < fileName.size(); i++)	// conversion of selected image file path form QString into unsigned char
	{
		character = fileName.at(i).toAscii();
		fName[i] = character;
	}

	const char* pszFilename = fName; 
        ....