C++ (Cpp) NWT_GRCDataset Examples

Example #1

File: grcdataset.cpp Project: actian-geospatial/ogr-ingres

GDALDataset *NWT_GRCDataset::Open( GDALOpenInfo * poOpenInfo )
{
/* -------------------------------------------------------------------- */
/*  Look for the header                                                 */
/* -------------------------------------------------------------------- */
    if( poOpenInfo->fp == NULL || poOpenInfo->nHeaderBytes < 50 )
        return NULL;

    if( poOpenInfo->pabyHeader[0] != 'H' ||
        poOpenInfo->pabyHeader[1] != 'G' ||
        poOpenInfo->pabyHeader[2] != 'P' ||
        poOpenInfo->pabyHeader[3] != 'C' ||
        poOpenInfo->pabyHeader[4] != '8' )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Create a corresponding GDALDataset.                             */
/* -------------------------------------------------------------------- */
    NWT_GRCDataset *poDS;

    poDS = new NWT_GRCDataset();

    poDS->fp = poOpenInfo->fp;
    poOpenInfo->fp = NULL;

/* -------------------------------------------------------------------- */
/*      Read the header.                                                */
/* -------------------------------------------------------------------- */
    VSIFSeek( poDS->fp, 0, SEEK_SET );
    VSIFRead( poDS->abyHeader, 1, 1024, poDS->fp );
    poDS->pGrd = (NWT_GRID *) malloc( sizeof (NWT_GRID) );

    poDS->pGrd->fp = poDS->fp;

    if (!nwt_ParseHeader( poDS->pGrd, (char *) poDS->abyHeader ) ||
        !GDALCheckDatasetDimensions(poDS->pGrd->nXSide, poDS->pGrd->nYSide) ||
        poDS->pGrd->stClassDict == NULL)
    {
        delete poDS;
        return NULL;
    }

    poDS->nRasterXSize = poDS->pGrd->nXSide;
    poDS->nRasterYSize = poDS->pGrd->nYSide;

/* -------------------------------------------------------------------- */
/*      Create band information objects.                                */
/* -------------------------------------------------------------------- */
    poDS->SetBand( 1, new NWT_GRCRasterBand( poDS, 1) );    //Class Indexes

/* -------------------------------------------------------------------- */
/*      Initialize any PAM information.                                 */
/* -------------------------------------------------------------------- */
    poDS->SetDescription( poOpenInfo->pszFilename );
    poDS->TryLoadXML();

    return (poDS);
}

Example #2

File: grcdataset.cpp Project: rashadkm/lib_gdal

GDALDataset *NWT_GRCDataset::Open( GDALOpenInfo * poOpenInfo )
{
    if( !Identify(poOpenInfo) )
        return NULL;

/* -------------------------------------------------------------------- */
/*      Create a corresponding GDALDataset.                             */
/* -------------------------------------------------------------------- */
    NWT_GRCDataset *poDS;

    poDS = new NWT_GRCDataset();

    poDS->fp = VSIFOpenL(poOpenInfo->pszFilename, "rb");
    if (poDS->fp == NULL)
    {
        delete poDS;
        return NULL;
    }

/* -------------------------------------------------------------------- */
/*      Read the header.                                                */
/* -------------------------------------------------------------------- */
    VSIFSeekL( poDS->fp, 0, SEEK_SET );
    VSIFReadL( poDS->abyHeader, 1, 1024, poDS->fp );
    poDS->pGrd = (NWT_GRID *) malloc( sizeof (NWT_GRID) );

    poDS->pGrd->fp = poDS->fp;

    if (!nwt_ParseHeader( poDS->pGrd, (char *) poDS->abyHeader ) ||
        !GDALCheckDatasetDimensions(poDS->pGrd->nXSide, poDS->pGrd->nYSide) ||
        poDS->pGrd->stClassDict == NULL)
    {
        delete poDS;
        return NULL;
    }

    poDS->nRasterXSize = poDS->pGrd->nXSide;
    poDS->nRasterYSize = poDS->pGrd->nYSide;

/* -------------------------------------------------------------------- */
/*      Create band information objects.                                */
/* -------------------------------------------------------------------- */
    poDS->SetBand( 1, new NWT_GRCRasterBand( poDS, 1) );    //Class Indexes

/* -------------------------------------------------------------------- */
/*      Initialize any PAM information.                                 */
/* -------------------------------------------------------------------- */
    poDS->SetDescription( poOpenInfo->pszFilename );
    poDS->TryLoadXML();

/* -------------------------------------------------------------------- */
/*      Check for external overviews.                                   */
/* -------------------------------------------------------------------- */
    poDS->oOvManager.Initialize( poDS, poOpenInfo->pszFilename, poOpenInfo->GetSiblingFiles() );

    return (poDS);
}