本文整理汇总了C++中OGRDataSource::Release方法的典型用法代码示例。如果您正苦于以下问题：C++ OGRDataSource::Release方法的具体用法？C++ OGRDataSource::Release怎么用？C++ OGRDataSource::Release使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类OGRDataSource的用法示例。
在下文中一共展示了OGRDataSource::Release方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: VectortoRaster
int Raster::VectortoRaster(const char * sVectorSourcePath,
const char * sRasterOutputPath,
double dCellWidth,
const char * psFieldName){
OGRRegisterAll();
OGRDataSource * pDSVectorInput;
pDSVectorInput = OGRSFDriverRegistrar::Open( sVectorSourcePath, FALSE );
if (pDSVectorInput == NULL)
return INPUT_FILE_ERROR;
// Get the extents of the file before passing it off to the function that actually burns
// the geometries
// -------------------------------------------------------
// Note: we're just grabbing the first layer here. If we get into needing multiple layers
// Then we'll need to re-think this.
OGRLayer * poLayer = pDSVectorInput->GetLayer(0);
if (poLayer == NULL)
return VECTOR_LAYER_NOT_FOUND;
OGREnvelope psExtent;
poLayer->GetExtent(&psExtent, TRUE);
double dMaxY, dMaxX, dMinY, dMinX;
double cellWidth = fabs(dCellWidth);
dMaxY = ceil(psExtent.MaxY / cellWidth) * cellWidth;
dMaxX = ceil(psExtent.MaxX / cellWidth) * cellWidth;
dMinY = floor(psExtent.MinY / cellWidth) * cellWidth;
dMinX = floor(psExtent.MinX / cellWidth) * cellWidth;
int nRows = (int)((dMaxY - dMinY) / cellWidth);
int nCols = (int)((dMaxX - dMinX) / cellWidth);
\
// We're going to create them without projections. The projections get set later.
double fNoDataValue = (double) -std::numeric_limits<float>::max();
GDALDataType nDType = GDT_Float32;
double dCellHeight = -dCellWidth;
RasterMeta TemplateRaster(psExtent.MaxY, psExtent.MinX, nRows, nCols, &dCellHeight, &dCellWidth, &fNoDataValue, "GTiff", &nDType, "");
pDSVectorInput->Release();
return VectortoRaster(sVectorSourcePath, sRasterOutputPath, psFieldName, &TemplateRaster);
}示例2: OGR2SQLITE_ogr_datasource_load_layers
static
void OGR2SQLITE_ogr_datasource_load_layers(sqlite3_context* pContext,
int argc, sqlite3_value** argv)
{
sqlite3* hDB = (sqlite3*) sqlite3_user_data(pContext);
if( (argc < 1 || argc > 3) || sqlite3_value_type (argv[0]) != SQLITE_TEXT )
{
sqlite3_result_int (pContext, 0);
return;
}
const char* pszDataSource = (const char*) sqlite3_value_text(argv[0]);
int bUpdate = FALSE;
if( argc >= 2 )
{
if( sqlite3_value_type(argv[1]) != SQLITE_INTEGER )
{
sqlite3_result_int (pContext, 0);
return;
}
bUpdate = sqlite3_value_int(argv[1]);
}
const char* pszPrefix = NULL;
if( argc >= 3 )
{
if( sqlite3_value_type(argv[2]) != SQLITE_TEXT )
{
sqlite3_result_int (pContext, 0);
return;
}
pszPrefix = (const char*) sqlite3_value_text(argv[2]);
}
OGRDataSource* poDS = (OGRDataSource*)OGROpenShared(pszDataSource, bUpdate, NULL);
if( poDS == NULL )
{
CPLError(CE_Failure, CPLE_AppDefined, "Cannot open %s", pszDataSource);
sqlite3_result_int (pContext, 0);
return;
}
CPLString osEscapedDataSource = OGRSQLiteEscape(pszDataSource);
for(int i=0; i<poDS->GetLayerCount(); i++)
{
const char* pszLayerName = poDS->GetLayer(i)->GetName();
CPLString osEscapedLayerName = OGRSQLiteEscape(pszLayerName);
CPLString osTableName;
if( pszPrefix != NULL )
{
osTableName = pszPrefix;
osTableName += "_";
osTableName += OGRSQLiteEscapeName(pszLayerName);
}
else
{
osTableName = OGRSQLiteEscapeName(pszLayerName);
}
char* pszErrMsg = NULL;
if( sqlite3_exec(hDB, CPLSPrintf(
"CREATE VIRTUAL TABLE \"%s\" USING VirtualOGR('%s', %d, '%s')",
osTableName.c_str(),
osEscapedDataSource.c_str(),
bUpdate,
osEscapedLayerName.c_str()),
NULL, NULL, &pszErrMsg) != SQLITE_OK )
{
CPLError(CE_Failure, CPLE_AppDefined,
"Cannot create table \"%s\" : %s",
osTableName.c_str(), pszErrMsg);
sqlite3_free(pszErrMsg);
}
}
poDS->Release();
sqlite3_result_int (pContext, 1);
}