/
qgsvectorfilewriter.cpp
1081 lines (952 loc) · 29.9 KB
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qgsvectorfilewriter.cpp
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/***************************************************************************
qgsvectorfilewriter.cpp
generic vector file writer
-------------------
begin : Sat Jun 16 2004
copyright : (C) 2004 by Tim Sutton
email : tim at linfiniti.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsapplication.h"
#include "qgsfield.h"
#include "qgsfeature.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectorfilewriter.h"
#include <QFile>
#include <QSettings>
#include <QFileInfo>
#include <QDir>
#include <QTextCodec>
#include <QTextStream>
#include <QSet>
#include <QMetaType>
#include <cassert>
#include <cstdlib> // size_t
#include <limits> // std::numeric_limits
#include <ogr_api.h>
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <cpl_conv.h>
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800
#define TO8(x) (x).toUtf8().constData()
#define TO8F(x) (x).toUtf8().constData()
#else
#define TO8(x) (x).toLocal8Bit().constData()
#define TO8F(x) QFile::encodeName( x ).constData()
#endif
QgsVectorFileWriter::QgsVectorFileWriter(
const QString &theVectorFileName,
const QString &theFileEncoding,
const QgsFieldMap& fields,
QGis::WkbType geometryType,
const QgsCoordinateReferenceSystem* srs,
const QString& driverName,
const QStringList &datasourceOptions,
const QStringList &layerOptions,
QString *newFilename
)
: mDS( NULL )
, mLayer( NULL )
, mGeom( NULL )
, mError( NoError )
{
QString vectorFileName = theVectorFileName;
QString fileEncoding = theFileEncoding;
QStringList dsOptions = datasourceOptions;
QString ogrDriverName;
if ( driverName == "MapInfo MIF" )
{
ogrDriverName = "MapInfo File";
}
else if ( driverName == "SpatiaLite" )
{
ogrDriverName = "SQLite";
if ( !dsOptions.contains( "SPATIALITE=YES" ) )
{
dsOptions.append( "SPATIALITE=YES" );
}
}
else
{
ogrDriverName = driverName;
}
// find driver in OGR
OGRSFDriverH poDriver;
QgsApplication::registerOgrDrivers();
poDriver = OGRGetDriverByName( ogrDriverName.toLocal8Bit().data() );
if ( poDriver == NULL )
{
mErrorMessage = QObject::tr( "OGR driver for '%1' not found (OGR error: %2)" )
.arg( driverName )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrDriverNotFound;
return;
}
if ( driverName == "ESRI Shapefile" )
{
if ( !vectorFileName.endsWith( ".shp", Qt::CaseInsensitive ) &&
!vectorFileName.endsWith( ".dbf", Qt::CaseInsensitive ) )
{
vectorFileName += ".shp";
}
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM < 1700
// check for unique fieldnames
QSet<QString> fieldNames;
QgsFieldMap::const_iterator fldIt;
for ( fldIt = fields.begin(); fldIt != fields.end(); ++fldIt )
{
QString name = fldIt.value().name().left( 10 );
if ( fieldNames.contains( name ) )
{
mErrorMessage = QObject::tr( "trimming attribute name '%1' to ten significant characters produces duplicate column name." )
.arg( fldIt.value().name() );
mError = ErrAttributeCreationFailed;
return;
}
fieldNames << name;
}
#endif
deleteShapeFile( vectorFileName );
}
else if ( driverName == "KML" )
{
if ( !vectorFileName.endsWith( ".kml", Qt::CaseInsensitive ) )
{
vectorFileName += ".kml";
}
if ( fileEncoding.compare( "UTF-8", Qt::CaseInsensitive ) != 0 )
{
QgsDebugMsg( "forced UTF-8 encoding for KML" );
fileEncoding = "UTF-8";
}
QFile::remove( vectorFileName );
}
else
{
QString longName;
QString trLongName;
QString glob;
QString exts;
if ( QgsVectorFileWriter::driverMetadata( driverName, longName, trLongName, glob, exts ) )
{
QStringList allExts = exts.split( " ", QString::SkipEmptyParts );
bool found = false;
foreach ( QString ext, allExts )
{
if ( vectorFileName.endsWith( "." + ext, Qt::CaseInsensitive ) )
{
found = true;
break;
}
}
if ( !found )
{
vectorFileName += "." + allExts[0];
}
}
QFile::remove( vectorFileName );
}
char **options = NULL;
if ( !dsOptions.isEmpty() )
{
options = new char *[ dsOptions.size()+1 ];
for ( int i = 0; i < dsOptions.size(); i++ )
{
options[i] = CPLStrdup( dsOptions[i].toLocal8Bit().data() );
}
options[ dsOptions.size()] = NULL;
}
// create the data source
mDS = OGR_Dr_CreateDataSource( poDriver, TO8( vectorFileName ), options );
if ( options )
{
for ( int i = 0; i < dsOptions.size(); i++ )
CPLFree( options[i] );
delete [] options;
options = NULL;
}
if ( mDS == NULL )
{
mError = ErrCreateDataSource;
mErrorMessage = QObject::tr( "creation of data source failed (OGR error:%1)" )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
return;
}
QgsDebugMsg( "Created data source" );
// use appropriate codec
mCodec = QTextCodec::codecForName( fileEncoding.toLocal8Bit().constData() );
if ( !mCodec )
{
QgsDebugMsg( "error finding QTextCodec for " + fileEncoding );
QSettings settings;
QString enc = settings.value( "/UI/encoding", "System" ).toString();
mCodec = QTextCodec::codecForName( enc.toLocal8Bit().constData() );
if ( !mCodec )
{
QgsDebugMsg( "error finding QTextCodec for " + enc );
mCodec = QTextCodec::codecForLocale();
Q_ASSERT( mCodec );
}
}
// consider spatial reference system of the layer
OGRSpatialReferenceH ogrRef = NULL;
if ( srs )
{
QString srsWkt = srs->toWkt();
QgsDebugMsg( "WKT to save as is " + srsWkt );
ogrRef = OSRNewSpatialReference( srsWkt.toLocal8Bit().data() );
}
// datasource created, now create the output layer
QString layerName = QFileInfo( vectorFileName ).baseName();
OGRwkbGeometryType wkbType = static_cast<OGRwkbGeometryType>( geometryType );
if ( !layerOptions.isEmpty() )
{
options = new char *[ layerOptions.size()+1 ];
for ( int i = 0; i < layerOptions.size(); i++ )
{
options[i] = CPLStrdup( layerOptions[i].toLocal8Bit().data() );
}
options[ layerOptions.size()] = NULL;
}
mLayer = OGR_DS_CreateLayer( mDS, TO8F( layerName ), ogrRef, wkbType, options );
if ( options )
{
for ( int i = 0; i < layerOptions.size(); i++ )
CPLFree( options[i] );
delete [] options;
options = NULL;
}
if ( srs )
{
if ( driverName == "ESRI Shapefile" )
{
QString layerName = vectorFileName.left( vectorFileName.indexOf( ".shp", Qt::CaseInsensitive ) );
QFile prjFile( layerName + ".qpj" );
if ( prjFile.open( QIODevice::WriteOnly ) )
{
QTextStream prjStream( &prjFile );
prjStream << srs->toWkt().toLocal8Bit().data() << endl;
prjFile.close();
}
else
{
QgsDebugMsg( "Couldn't open file " + layerName + ".qpj" );
}
}
OSRDestroySpatialReference( ogrRef );
}
if ( mLayer == NULL )
{
mErrorMessage = QObject::tr( "creation of layer failed (OGR error:%1)" )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrCreateLayer;
return;
}
OGRFeatureDefnH defn = OGR_L_GetLayerDefn( mLayer );
QgsDebugMsg( "created layer" );
// create the fields
QgsDebugMsg( "creating " + QString::number( fields.size() ) + " fields" );
mFields = fields;
mAttrIdxToOgrIdx.clear();
QgsFieldMap::const_iterator fldIt;
for ( fldIt = fields.begin(); fldIt != fields.end(); ++fldIt )
{
const QgsField& attrField = fldIt.value();
OGRFieldType ogrType = OFTString; //default to string
int ogrWidth = fldIt->length();
int ogrPrecision = fldIt->precision();
switch ( attrField.type() )
{
case QVariant::LongLong:
ogrType = OFTString;
ogrWidth = ogrWidth > 0 && ogrWidth <= 21 ? ogrWidth : 21;
ogrPrecision = -1;
break;
case QVariant::String:
ogrType = OFTString;
if ( ogrWidth <= 0 || ogrWidth > 255 )
ogrWidth = 255;
break;
case QVariant::Int:
ogrType = OFTInteger;
ogrWidth = ogrWidth > 0 && ogrWidth <= 10 ? ogrWidth : 10;
ogrPrecision = 0;
break;
case QVariant::Double:
ogrType = OFTReal;
break;
default:
//assert(0 && "invalid variant type!");
mErrorMessage = QObject::tr( "unsupported type for field %1" )
.arg( attrField.name() );
mError = ErrAttributeTypeUnsupported;
return;
}
// create field definition
OGRFieldDefnH fld = OGR_Fld_Create( mCodec->fromUnicode( attrField.name() ), ogrType );
if ( ogrWidth > 0 )
{
OGR_Fld_SetWidth( fld, ogrWidth );
}
if ( ogrPrecision >= 0 )
{
OGR_Fld_SetPrecision( fld, ogrPrecision );
}
// create the field
QgsDebugMsg( "creating field " + attrField.name() +
" type " + QString( QVariant::typeToName( attrField.type() ) ) +
" width " + QString::number( ogrWidth ) +
" precision " + QString::number( ogrPrecision ) );
if ( OGR_L_CreateField( mLayer, fld, true ) != OGRERR_NONE )
{
QgsDebugMsg( "error creating field " + attrField.name() );
mErrorMessage = QObject::tr( "creation of field %1 failed (OGR error: %2)" )
.arg( attrField.name() )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrAttributeCreationFailed;
return;
}
int ogrIdx = OGR_FD_GetFieldIndex( defn, mCodec->fromUnicode( attrField.name() ) );
if ( ogrIdx < 0 )
{
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM < 1700
// if we didn't find our new column, assume it's name was truncated and
// it was the last one added (like for shape files)
int fieldCount = OGR_FD_GetFieldCount( defn );
OGRFieldDefnH fdefn = OGR_FD_GetFieldDefn( defn, fieldCount - 1 );
if ( fdefn )
{
const char *fieldName = OGR_Fld_GetNameRef( fdefn );
if ( attrField.name().left( strlen( fieldName ) ) == fieldName )
{
ogrIdx = fieldCount - 1;
}
}
#else
// GDAL 1.7 not just truncates, but launders more aggressivly.
ogrIdx = OGR_FD_GetFieldCount( defn ) - 1;
#endif
if ( ogrIdx < 0 )
{
QgsDebugMsg( "error creating field " + attrField.name() );
mErrorMessage = QObject::tr( "created field %1 not found (OGR error: %2)" )
.arg( attrField.name() )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrAttributeCreationFailed;
return;
}
}
mAttrIdxToOgrIdx.insert( fldIt.key(), ogrIdx );
}
QgsDebugMsg( "Done creating fields" );
mWkbType = geometryType;
if ( mWkbType != QGis::WKBNoGeometry )
{
// create geometry which will be used for import
mGeom = createEmptyGeometry( mWkbType );
}
if ( newFilename )
*newFilename = vectorFileName;
}
OGRGeometryH QgsVectorFileWriter::createEmptyGeometry( QGis::WkbType wkbType )
{
return OGR_G_CreateGeometry(( OGRwkbGeometryType ) wkbType );
}
QgsVectorFileWriter::WriterError QgsVectorFileWriter::hasError()
{
return mError;
}
QString QgsVectorFileWriter::errorMessage()
{
return mErrorMessage;
}
bool QgsVectorFileWriter::addFeature( QgsFeature& feature )
{
// create the feature
OGRFeatureH poFeature = OGR_F_Create( OGR_L_GetLayerDefn( mLayer ) );
qint64 fid = FID_TO_NUMBER( feature.id() );
if ( fid > std::numeric_limits<int>::max() )
{
QgsDebugMsg( QString( "feature id %1 too large." ).arg( fid ) );
}
OGRErr err = OGR_F_SetFID( poFeature, static_cast<long>( fid ) );
if ( err != OGRERR_NONE )
{
QgsDebugMsg( QString( "Failed to set feature id to %1: %2 (OGR error: %3)" )
.arg( feature.id() )
.arg( err ).arg( CPLGetLastErrorMsg() )
);
}
// attribute handling
QgsFieldMap::const_iterator fldIt;
for ( fldIt = mFields.begin(); fldIt != mFields.end(); ++fldIt )
{
if ( !feature.attributeMap().contains( fldIt.key() ) )
{
QgsDebugMsg( QString( "no attribute for field %1" ).arg( fldIt.key() ) );
continue;
}
if ( !mAttrIdxToOgrIdx.contains( fldIt.key() ) )
{
QgsDebugMsg( QString( "no ogr field for field %1" ).arg( fldIt.key() ) );
continue;
}
const QVariant& attrValue = feature.attributeMap()[ fldIt.key()];
int ogrField = mAttrIdxToOgrIdx[ fldIt.key()];
if ( attrValue.isNull() )
continue;
switch ( attrValue.type() )
{
case QVariant::Int:
OGR_F_SetFieldInteger( poFeature, ogrField, attrValue.toInt() );
break;
case QVariant::Double:
OGR_F_SetFieldDouble( poFeature, ogrField, attrValue.toDouble() );
break;
case QVariant::LongLong:
case QVariant::String:
OGR_F_SetFieldString( poFeature, ogrField, mCodec->fromUnicode( attrValue.toString() ).data() );
break;
case QVariant::Invalid:
break;
default:
mErrorMessage = QObject::tr( "Invalid variant type for field %1[%2]: received %3 with type %4" )
.arg( fldIt.value().name() )
.arg( ogrField )
.arg( QMetaType::typeName( attrValue.type() ) )
.arg( attrValue.toString() );
QgsMessageLog::logMessage( mErrorMessage, QObject::tr( "OGR" ) );
mError = ErrFeatureWriteFailed;
return false;
}
}
if ( mWkbType != QGis::WKBNoGeometry )
{
// build geometry from WKB
QgsGeometry *geom = feature.geometry();
// turn single geoemetry to multi geometry if needed
if ( geom && geom->wkbType() != mWkbType && geom->wkbType() == QGis::flatType( mWkbType ) )
{
geom->convertToMultiType();
}
if ( geom && geom->wkbType() != mWkbType )
{
// there's a problem when layer type is set as wkbtype Polygon
// although there are also features of type MultiPolygon
// (at least in OGR provider)
// If the feature's wkbtype is different from the layer's wkbtype,
// try to export it too.
//
// Btw. OGRGeometry must be exactly of the type of the geometry which it will receive
// i.e. Polygons can't be imported to OGRMultiPolygon
OGRGeometryH mGeom2 = createEmptyGeometry( geom->wkbType() );
if ( !mGeom2 )
{
mErrorMessage = QObject::tr( "Feature geometry not imported (OGR error: %1)" )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrFeatureWriteFailed;
QgsMessageLog::logMessage( mErrorMessage, QObject::tr( "OGR" ) );
OGR_F_Destroy( poFeature );
return false;
}
OGRErr err = OGR_G_ImportFromWkb( mGeom2, geom->asWkb(), geom->wkbSize() );
if ( err != OGRERR_NONE )
{
mErrorMessage = QObject::tr( "Feature geometry not imported (OGR error: %1)" )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrFeatureWriteFailed;
QgsMessageLog::logMessage( mErrorMessage, QObject::tr( "OGR" ) );
OGR_F_Destroy( poFeature );
return false;
}
// pass ownership to geometry
OGR_F_SetGeometryDirectly( poFeature, mGeom2 );
}
else if ( geom )
{
OGRErr err = OGR_G_ImportFromWkb( mGeom, geom->asWkb(), geom->wkbSize() );
if ( err != OGRERR_NONE )
{
mErrorMessage = QObject::tr( "Feature geometry not imported (OGR error: %1)" )
.arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrFeatureWriteFailed;
QgsMessageLog::logMessage( mErrorMessage, QObject::tr( "OGR" ) );
OGR_F_Destroy( poFeature );
return false;
}
// set geometry (ownership is not passed to OGR)
OGR_F_SetGeometry( poFeature, mGeom );
}
}
// put the created feature to layer
if ( OGR_L_CreateFeature( mLayer, poFeature ) != OGRERR_NONE )
{
mErrorMessage = QObject::tr( "Feature creation error (OGR error: %1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) );
mError = ErrFeatureWriteFailed;
QgsMessageLog::logMessage( mErrorMessage, QObject::tr( "OGR" ) );
OGR_F_Destroy( poFeature );
return false;
}
OGR_F_Destroy( poFeature );
return true;
}
QgsVectorFileWriter::~QgsVectorFileWriter()
{
if ( mGeom )
{
OGR_G_DestroyGeometry( mGeom );
}
if ( mDS )
{
OGR_DS_Destroy( mDS );
}
}
QgsVectorFileWriter::WriterError
QgsVectorFileWriter::writeAsShapefile( QgsVectorLayer* layer,
const QString& shapefileName,
const QString& fileEncoding,
const QgsCoordinateReferenceSystem* destCRS,
bool onlySelected,
QString *errorMessage,
const QStringList &datasourceOptions,
const QStringList &layerOptions )
{
return writeAsVectorFormat( layer, shapefileName, fileEncoding, destCRS, "ESRI Shapefile", onlySelected, errorMessage, datasourceOptions, layerOptions );
}
QgsVectorFileWriter::WriterError
QgsVectorFileWriter::writeAsVectorFormat( QgsVectorLayer* layer,
const QString& fileName,
const QString& fileEncoding,
const QgsCoordinateReferenceSystem *destCRS,
const QString& driverName,
bool onlySelected,
QString *errorMessage,
const QStringList &datasourceOptions,
const QStringList &layerOptions,
bool skipAttributeCreation,
QString *newFilename )
{
QgsDebugMsg( "fileName = " + fileName );
const QgsCoordinateReferenceSystem* outputCRS;
QgsCoordinateTransform* ct = 0;
int shallTransform = false;
if ( layer == NULL )
{
return ErrInvalidLayer;
}
if ( destCRS && destCRS->isValid() )
{
// This means we should transform
outputCRS = destCRS;
shallTransform = true;
}
else
{
// This means we shouldn't transform, use source CRS as output (if defined)
outputCRS = &layer->crs();
}
QgsVectorFileWriter* writer =
new QgsVectorFileWriter( fileName, fileEncoding, skipAttributeCreation ? QgsFieldMap() : layer->pendingFields(), layer->wkbType(), outputCRS, driverName, datasourceOptions, layerOptions, newFilename );
QgsDebugMsg( "newFilename = " + *newFilename );
// check whether file creation was successful
WriterError err = writer->hasError();
if ( err != NoError )
{
if ( errorMessage )
*errorMessage = writer->errorMessage();
delete writer;
return err;
}
if ( errorMessage )
{
errorMessage->clear();
}
QgsAttributeList allAttr = skipAttributeCreation ? QgsAttributeList() : layer->pendingAllAttributesList();
QgsFeature fet;
layer->select( allAttr, QgsRectangle(), layer->wkbType() != QGis::WKBNoGeometry );
const QgsFeatureIds& ids = layer->selectedFeaturesIds();
// Create our transform
if ( destCRS )
{
ct = new QgsCoordinateTransform( layer->crs(), *destCRS );
}
// Check for failure
if ( ct == NULL )
{
shallTransform = false;
}
int n = 0, errors = 0;
// write all features
while ( layer->nextFeature( fet ) )
{
if ( onlySelected && !ids.contains( fet.id() ) )
continue;
if ( shallTransform )
{
try
{
if ( fet.geometry() )
{
fet.geometry()->transform( *ct );
}
}
catch ( QgsCsException &e )
{
delete ct;
delete writer;
QString msg = QObject::tr( "Failed to transform a point while drawing a feature of type '%1'. Writing stopped. (Exception: %2)" )
.arg( fet.typeName() ).arg( e.what() );
QgsLogger::warning( msg );
if ( errorMessage )
*errorMessage = msg;
return ErrProjection;
}
}
if ( skipAttributeCreation )
{
fet.clearAttributeMap();
}
if ( !writer->addFeature( fet ) )
{
WriterError err = writer->hasError();
if ( err != NoError && errorMessage )
{
if ( errorMessage->isEmpty() )
{
*errorMessage = QObject::tr( "Feature write errors:" );
}
*errorMessage += "\n" + writer->errorMessage();
}
errors++;
if ( errors > 1000 )
{
if ( errorMessage )
{
*errorMessage += QObject::tr( "Stopping after %1 errors" ).arg( errors );
}
n = -1;
break;
}
}
n++;
}
delete writer;
if ( shallTransform )
{
delete ct;
}
if ( errors > 0 && errorMessage && n > 0 )
{
*errorMessage += QObject::tr( "\nOnly %1 of %2 features written." ).arg( n - errors ).arg( n );
}
return errors == 0 ? NoError : ErrFeatureWriteFailed;
}
bool QgsVectorFileWriter::deleteShapeFile( QString theFileName )
{
QFileInfo fi( theFileName );
QDir dir = fi.dir();
QStringList filter;
const char *suffixes[] = { ".shp", ".shx", ".dbf", ".prj", ".qix", ".qpj" };
for ( std::size_t i = 0; i < sizeof( suffixes ) / sizeof( *suffixes ); i++ )
{
filter << fi.completeBaseName() + suffixes[i];
}
bool ok = true;
foreach ( QString file, dir.entryList( filter ) )
{
if ( !QFile::remove( dir.canonicalPath() + "/" + file ) )
{
QgsDebugMsg( "Removing file failed : " + file );
ok = false;
}
}
return ok;
}
QMap< QString, QString> QgsVectorFileWriter::supportedFiltersAndFormats()
{
QMap<QString, QString> resultMap;
QgsApplication::registerOgrDrivers();
int const drvCount = OGRGetDriverCount();
for ( int i = 0; i < drvCount; ++i )
{
OGRSFDriverH drv = OGRGetDriver( i );
if ( drv )
{
QString drvName = OGR_Dr_GetName( drv );
if ( OGR_Dr_TestCapability( drv, "CreateDataSource" ) != 0 )
{
QString filterString = filterForDriver( drvName );
if ( filterString.isEmpty() )
continue;
resultMap.insert( filterString, drvName );
}
}
}
return resultMap;
}
QMap<QString, QString> QgsVectorFileWriter::ogrDriverList()
{
QMap<QString, QString> resultMap;
QgsApplication::registerOgrDrivers();
int const drvCount = OGRGetDriverCount();
QStringList writableDrivers;
for ( int i = 0; i < drvCount; ++i )
{
OGRSFDriverH drv = OGRGetDriver( i );
if ( drv )
{
QString drvName = OGR_Dr_GetName( drv );
if ( OGR_Dr_TestCapability( drv, "CreateDataSource" ) != 0 )
{
// Add separate format for Mapinfo MIF (MITAB is OGR default)
if ( drvName == "MapInfo File" )
{
writableDrivers << "MapInfo MIF";
}
else if ( drvName == "SQLite" )
{
// Unfortunately it seems that there is no simple way to detect if
// OGR SQLite driver is compiled with SpatiaLite support.
// We have HAVE_SPATIALITE in QGIS, but that may differ from OGR
// http://lists.osgeo.org/pipermail/gdal-dev/2012-November/034580.html
// -> test if creation failes
QString option = "SPATIALITE=YES";
char **options = new char *[2];
options[0] = CPLStrdup( option.toLocal8Bit().data() );
options[1] = NULL;
OGRSFDriverH poDriver;
QgsApplication::registerOgrDrivers();
poDriver = OGRGetDriverByName( drvName.toLocal8Bit().data() );
if ( poDriver )
{
OGRDataSourceH ds = OGR_Dr_CreateDataSource( poDriver, TO8( QString( "/vsimem/spatialitetest.sqlite" ) ), options );
if ( ds )
{
writableDrivers << "SpatiaLite";
OGR_DS_Destroy( ds );
}
}
CPLFree( options[0] );
delete [] options;
}
writableDrivers << drvName;
}
}
}
foreach ( QString drvName, writableDrivers )
{
QString longName;
QString trLongName;
QString glob;
QString exts;
if ( QgsVectorFileWriter::driverMetadata( drvName, longName, trLongName, glob, exts ) && !trLongName.isEmpty() )
{
resultMap.insert( trLongName, drvName );
}
}
return resultMap;
}
QString QgsVectorFileWriter::fileFilterString()
{
QString filterString;
QMap< QString, QString> driverFormatMap = supportedFiltersAndFormats();
QMap< QString, QString>::const_iterator it = driverFormatMap.constBegin();
for ( ; it != driverFormatMap.constEnd(); ++it )
{
if ( filterString.isEmpty() )
filterString += ";;";
filterString += it.key();
}
return filterString;
}
QString QgsVectorFileWriter::filterForDriver( const QString& driverName )
{
QString longName;
QString trLongName;
QString glob;
QString exts;
if ( !driverMetadata( driverName, longName, trLongName, glob, exts ) || trLongName.isEmpty() || glob.isEmpty() )
return "";
return trLongName + " [OGR] (" + glob.toLower() + " " + glob.toUpper() + ")";
}
bool QgsVectorFileWriter::driverMetadata( QString driverName, QString &longName, QString &trLongName, QString &glob, QString &ext )
{
if ( driverName.startsWith( "AVCE00" ) )
{
longName = "Arc/Info ASCII Coverage";
trLongName = QObject::tr( "Arc/Info ASCII Coverage" );
glob = "*.e00";
ext = "e00";
}
else if ( driverName.startsWith( "BNA" ) )
{
longName = "Atlas BNA";
trLongName = QObject::tr( "Atlas BNA" );
glob = "*.bna";
ext = "bna";
}
else if ( driverName.startsWith( "CSV" ) )
{
longName = "Comma Separated Value";
trLongName = QObject::tr( "Comma Separated Value" );
glob = "*.csv";
ext = "csv";
}
else if ( driverName.startsWith( "ESRI" ) )
{
longName = "ESRI Shapefile";
trLongName = QObject::tr( "ESRI Shapefile" );
glob = "*.shp";
ext = "shp";
}
else if ( driverName.startsWith( "FMEObjects Gateway" ) )
{
longName = "FMEObjects Gateway";
trLongName = QObject::tr( "FMEObjects Gateway" );
glob = "*.fdd";
ext = "fdd";
}
else if ( driverName.startsWith( "GeoJSON" ) )
{
longName = "GeoJSON";
trLongName = QObject::tr( "GeoJSON" );
glob = "*.geojson";
ext = "geojson";
}
else if ( driverName.startsWith( "GeoRSS" ) )
{
longName = "GeoRSS";
trLongName = QObject::tr( "GeoRSS" );
glob = "*.xml";
ext = "xml";
}
else if ( driverName.startsWith( "GML" ) )
{
longName = "Geography Markup Language [GML]";
trLongName = QObject::tr( "Geography Markup Language [GML]" );
glob = "*.gml";
ext = "gml";
}
else if ( driverName.startsWith( "GMT" ) )
{
longName = "Generic Mapping Tools [GMT]";
trLongName = QObject::tr( "Generic Mapping Tools [GMT]" );
glob = "*.gmt";
ext = "gmt";
}
else if ( driverName.startsWith( "GPX" ) )
{
longName = "GPS eXchange Format [GPX]";
trLongName = QObject::tr( "GPS eXchange Format [GPX]" );
glob = "*.gpx";
ext = "gpx";
}
else if ( driverName.startsWith( "Interlis 1" ) )
{
longName = "INTERLIS 1";
trLongName = QObject::tr( "INTERLIS 1" );
glob = "*.itf *.xml *.ili";
ext = "ili";
}
else if ( driverName.startsWith( "Interlis 2" ) )
{
longName = "INTERLIS 2";
trLongName = QObject::tr( "INTERLIS 2" );
glob = "*.itf *.xml *.ili";
ext = "ili";
}
else if ( driverName.startsWith( "KML" ) )
{
longName = "Keyhole Markup Language [KML]";
trLongName = QObject::tr( "Keyhole Markup Language [KML]" );
glob = "*.kml" ;