C++ CPL_IGNORE_RET_VAL函数代码示例

/*!
  \brief Load data block definitions (&B)

  Call VFKReader::OpenFile() before this function.

  \return number of data blocks or -1 on error
*/
int VFKReaderSQLite::ReadDataBlocks()
{
    int  nDataBlocks = -1;
    CPLString osSQL;
    const char *pszName, *pszDefn;
    IVFKDataBlock *poNewDataBlock;

    sqlite3_stmt *hStmt;

    osSQL.Printf("SELECT table_name, table_defn FROM %s", VFK_DB_TABLE);
    hStmt = PrepareStatement(osSQL.c_str());
    while(ExecuteSQL(hStmt) == OGRERR_NONE) {
        pszName = (const char*) sqlite3_column_text(hStmt, 0);
        pszDefn = (const char*) sqlite3_column_text(hStmt, 1);
        poNewDataBlock = (IVFKDataBlock *) CreateDataBlock(pszName);
        poNewDataBlock->SetGeometryType();
        poNewDataBlock->SetProperties(pszDefn);
        VFKReader::AddDataBlock(poNewDataBlock, NULL);
    }

    if (m_nDataBlockCount == 0) {
        CPL_IGNORE_RET_VAL(sqlite3_exec(m_poDB, "BEGIN", NULL, NULL, NULL));
        /* CREATE TABLE ... */
        nDataBlocks = VFKReader::ReadDataBlocks();
        CPL_IGNORE_RET_VAL(sqlite3_exec(m_poDB, "COMMIT", NULL, NULL, NULL));

        StoreInfo2DB();
    }

    return nDataBlocks;
}

int main(int argc, char* argv[])
{
    CPLJoinableThread* hThread;

    printf("main thread %p\n", (void*)CPLGetPID());

    argc = GDALGeneralCmdLineProcessor( argc, &argv, 0 );

    CPLSetConfigOption("GDAL_CACHEMAX", "0");
    CPLSetConfigOption("GDAL_DEBUG_BLOCK_CACHE", "ON");

    MyDataset* poDS = new MyDataset();

    char buf1[] = { 1 } ;
    CPL_IGNORE_RET_VAL(GDALRasterIO(GDALGetRasterBand(poDS, 1), GF_Write, 0, 0, 1, 1, buf1, 1, 1, GDT_Byte, 0, 0));

    hThread = CPLCreateJoinableThread(thread_func, NULL);
    CPLSleep(0.3);
    CPL_IGNORE_RET_VAL(GDALRasterIO(GDALGetRasterBand(poDS, 1), GF_Write, 1, 0, 1, 1, buf1, 1, 1, GDT_Byte, 0, 0));
    GDALFlushCacheBlock();

    CPLJoinThread(hThread);

    delete poDS;
    GDALDestroyDriverManager();
    CSLDestroy( argv );

    return 0;
}

CPLErr CTable2Dataset::SetGeoTransform( double * padfTransform )

{
    if( eAccess == GA_ReadOnly )
    {
        CPLError( CE_Failure, CPLE_NoWriteAccess,
                  "Unable to update geotransform on readonly file." );
        return CE_Failure;
    }

    if( padfTransform[2] != 0.0 || padfTransform[4] != 0.0 )
    {
        CPLError(
            CE_Failure, CPLE_AppDefined,
            "Rotated and sheared geotransforms not supported for CTable2." );
        return CE_Failure;
    }

    memcpy( adfGeoTransform, padfTransform, sizeof(double)*6 );

/* -------------------------------------------------------------------- */
/*      Update grid header.                                             */
/* -------------------------------------------------------------------- */
    const double dfDegToRad = M_PI / 180.0;

    // read grid header
    CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET ));

    char achHeader[160] = { '\0' };
    CPL_IGNORE_RET_VAL(VSIFReadL( achHeader, 1, sizeof(achHeader), fpImage ));

    // lower left origin (longitude, center of pixel, radians)
    double dfValue = (adfGeoTransform[0] + adfGeoTransform[1]*0.5) * dfDegToRad;
    CPL_LSBPTR64( &dfValue );
    memcpy( achHeader + 96, &dfValue, 8 );

    // lower left origin (latitude, center of pixel, radians)
    dfValue = (adfGeoTransform[3] + adfGeoTransform[5] * (nRasterYSize-0.5))
        * dfDegToRad;
    CPL_LSBPTR64( &dfValue );
    memcpy( achHeader + 104, &dfValue, 8 );

    // pixel width (radians)
    dfValue = adfGeoTransform[1] * dfDegToRad;
    CPL_LSBPTR64( &dfValue );
    memcpy( achHeader + 112, &dfValue, 8 );

    // pixel height (radians)
    dfValue = adfGeoTransform[5] * -1 * dfDegToRad;
    CPL_LSBPTR64( &dfValue );
    memcpy( achHeader + 120, &dfValue, 8 );

    // write grid header.
    CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET ));
    CPL_IGNORE_RET_VAL(VSIFWriteL( achHeader, 11, 16, fpImage ));

    return CE_None;
}

void OGRBNALayer::WriteCoord(VSILFILE* fp, double dfX, double dfY)
{
    char szBuffer[64];
    OGRFormatDouble(szBuffer, sizeof(szBuffer), dfX, '.', poDS->GetCoordinatePrecision());
    CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "%s", szBuffer));
    CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "%s", poDS->GetCoordinateSeparator()));
    OGRFormatDouble(szBuffer, sizeof(szBuffer), dfY, '.', poDS->GetCoordinatePrecision());
    CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "%s", szBuffer));
}

FASTDataset::~FASTDataset()

{
    FlushCache();

    CPLFree( pszDirname );
    CPLFree( pszProjection );
    for ( int i = 0; i < nBands; i++ )
        if ( fpChannels[i] )
            CPL_IGNORE_RET_VAL(VSIFCloseL( fpChannels[i] ));
    if( fpHeader != NULL )
        CPL_IGNORE_RET_VAL(VSIFCloseL( fpHeader ));
}

void BTDataset::FlushCache()

{
    GDALDataset::FlushCache();

    if( !bHeaderModified )
        return;

    bHeaderModified = FALSE;

    CPL_IGNORE_RET_VAL(VSIFSeekL( fpImage, 0, SEEK_SET ));
    CPL_IGNORE_RET_VAL(VSIFWriteL( abyHeader, 256, 1, fpImage ));
}

JDEMDataset::~JDEMDataset()

{
    FlushCache();
    if( fp != NULL )
        CPL_IGNORE_RET_VAL(VSIFCloseL( fp ));
}

GSCDataset::~GSCDataset()

{
    FlushCache();
    if( fpImage != NULL )
        CPL_IGNORE_RET_VAL(VSIFCloseL( fpImage ));
}

static int ReadInt( VSILFILE *fp )
{
    char c;
    int nRead = 0;
    char szBuffer[12];
    bool bInProlog = true;

    while( true )
    {
        if (VSIFReadL(&c, 1, 1, fp) != 1)
        {
            return 0;
        }
        if( bInProlog )
        {
            if ( !isspace( static_cast<int>(c) ) )
            {
                bInProlog = false;
            }
        }
        if( !bInProlog )
        {
            if( c != '-' && c != '+' && !(c >= '0' && c <= '9') )
            {
                CPL_IGNORE_RET_VAL(VSIFSeekL(fp, VSIFTellL(fp) - 1, SEEK_SET));
                break;
            }
            if( nRead < 11 )
                szBuffer[nRead] = c;
            nRead ++;
        }
    }
    szBuffer[std::min(nRead, 11)] = 0;
    return atoi(szBuffer);
}

static CPLErr PAuxDelete( const char * pszBasename )

{
    VSILFILE *fp = VSIFOpenL( CPLResetExtension( pszBasename, "aux" ), "r" );
    if( fp == NULL )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "%s does not appear to be a PAux dataset, there is no .aux file.",
                  pszBasename );
        return CE_Failure;
    }

    const char *pszLine = CPLReadLineL( fp );
    CPL_IGNORE_RET_VAL(VSIFCloseL( fp ));

    if( pszLine == NULL || !STARTS_WITH_CI(pszLine, "AuxilaryTarget") )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "%s does not appear to be a PAux dataset,\n"
                  "the .aux file does not start with AuxilaryTarget",
                  pszBasename );
        return CE_Failure;
    }

    if( VSIUnlink( pszBasename ) != 0 )
    {
        CPLError( CE_Failure, CPLE_AppDefined,
                  "OS unlinking file %s.", pszBasename );
        return CE_Failure;
    }

    VSIUnlink( CPLResetExtension( pszBasename, "aux" ) );

    return CE_None;
}

CPLErr JDEMRasterBand::IReadBlock( CPL_UNUSED int nBlockXOff,
                                   int nBlockYOff,
                                   void * pImage )

{
    JDEMDataset *poGDS = static_cast<JDEMDataset *>(poDS);

    if (pszRecord == nullptr)
    {
        if (bBufferAllocFailed)
            return CE_Failure;

        pszRecord = static_cast<char *>(VSI_MALLOC_VERBOSE(nRecordSize));
        if (pszRecord == nullptr)
        {
            bBufferAllocFailed = true;
            return CE_Failure;
        }
    }

    CPL_IGNORE_RET_VAL(
        VSIFSeekL(poGDS->fp, 1011 + nRecordSize * nBlockYOff, SEEK_SET));

    CPL_IGNORE_RET_VAL(VSIFReadL(pszRecord, 1, nRecordSize, poGDS->fp));

    if( !EQUALN(reinterpret_cast<char *>(poGDS->abyHeader), pszRecord, 6) )
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "JDEM Scanline corrupt.  Perhaps file was not transferred "
                 "in binary mode?");
        return CE_Failure;
    }

    if( JDEMGetField(pszRecord + 6, 3) != nBlockYOff + 1 )
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "JDEM scanline out of order, JDEM driver does not "
                 "currently support partial datasets.");
        return CE_Failure;
    }

    for( int i = 0; i < nBlockXSize; i++ )
        static_cast<float *>(pImage)[i] =
            JDEMGetField(pszRecord + 9 + 5 * i, 5) * 0.1f;

    return CE_None;
}

DOQ1Dataset::~DOQ1Dataset()

{
    FlushCache();

    CPLFree( pszProjection );
    if( fpImage != NULL )
        CPL_IGNORE_RET_VAL(VSIFCloseL( fpImage ));
}

USGSDEMDataset::~USGSDEMDataset()

{
    FlushCache();

    CPLFree( pszProjection );
    if( fp != nullptr )
        CPL_IGNORE_RET_VAL(VSIFCloseL( fp ));
}

static void GDALWriteIMDMultiLine( VSILFILE *fp, const char *pszValue )

{
    char **papszItems = CSLTokenizeStringComplex( pszValue, "(,) ",
                                                  FALSE, FALSE );
    const int nItemCount = CSLCount(papszItems);

    CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "(\n" ));

    for( int i = 0; i < nItemCount; i++ )
    {
        if( i == nItemCount-1 )
            CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "\t%s );\n", papszItems[i] ));
        else
            CPL_IGNORE_RET_VAL(VSIFPrintfL( fp, "\t%s,\n", papszItems[i] ));
    }
    CSLDestroy( papszItems );
}

GDALDataset *JDEMDataset::Open( GDALOpenInfo *poOpenInfo )

{
    // Confirm that the header is compatible with a JDEM dataset.
    if (!Identify(poOpenInfo))
        return nullptr;

    // Confirm the requested access is supported.
    if( poOpenInfo->eAccess == GA_Update )
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "The JDEM driver does not support update access to existing "
                 "datasets.");
        return nullptr;
    }

    // Check that the file pointer from GDALOpenInfo* is available.
    if( poOpenInfo->fpL == nullptr )
    {
        return nullptr;
    }

    // Create a corresponding GDALDataset.
    JDEMDataset *poDS = new JDEMDataset();

    // Borrow the file pointer from GDALOpenInfo*.
    poDS->fp = poOpenInfo->fpL;
    poOpenInfo->fpL = nullptr;

    // Read the header.
    CPL_IGNORE_RET_VAL(VSIFReadL(poDS->abyHeader, 1, 1012, poDS->fp));

    const char *psHeader = reinterpret_cast<char *>(poDS->abyHeader);
    poDS->nRasterXSize = JDEMGetField(psHeader + 23, 3);
    poDS->nRasterYSize = JDEMGetField(psHeader + 26, 3);
    if( poDS->nRasterXSize <= 0 || poDS->nRasterYSize <= 0 )
    {
        CPLError(CE_Failure, CPLE_AppDefined,
                 "Invalid dimensions : %d x %d",
                 poDS->nRasterXSize, poDS->nRasterYSize);
        delete poDS;
        return nullptr;
    }

    // Create band information objects.
    poDS->SetBand(1, new JDEMRasterBand(poDS, 1));

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

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

    return poDS;
}