Hello!
I'm chensuchun.I'm a newbie in devloping filter.I implement a filter for
exporting and importing my own format file,whose format is based on odt.But I
get some problems about filter.
the code of function filter( const Sequence< PropertyValue >& rDescriptor ) is
following:
xDoc = uno::Reference< document::XStorageBasedDocument >( mxSrcDoc,
uno::UNO_QUERY ); ///mxSrcDoc is set by setSourceDocument()
////save to a tmp storage use filter writer8
xSourceStorage = uno::Reference< embed::XStorage >(
xStorageFactory->createInstance(),
uno::UNO_QUERY );
uno::Sequence< beans::PropertyValue > afArgs( 1 );
afArgs[0].Name = ::rtl::OUString::createFromAscii( "FilterName" );
afArgs[0].Value <<= ::rtl::OUString::createFromAscii( "writer8" );
xDoc->storeToStorage( xSourceStorage, afArgs );
////add a sub storage to the xSourceStorage
const ::rtl::OUString aSubStorageName ( RTL_CONSTASCII_USTRINGPARAM (
"SubStorage" ) );
uno::Reference< embed::XStorage > xSubStorage =
xSourceStorage->openStorageElement( aSubStorageName,
embed::ElementModes::WRITE );
uno::Reference< beans::XPropertySet > xSubStoagePro( xSubStorage,
uno::UNO_QUERY );
xSubStoagePro->setPropertyValue( OUString::createFromAscii("MediaType"),
makeAny(OUString::createFromAscii("SubMediaType")) );
......
///create the target storage
uno::Sequence< uno::Any > aArgs( 2 );
aArgs[0] <<= aURL; ////get from rDescriptor
aArgs[1] <<= embed::ElementModes::READWRITE;
uno::Reference< embed::XStorage > xTargetStorage(
xStorageFactory->createInstanceWithArguments( aArgs ),
uno::UNO_QUERY );
////copy to target storage and commit
xSourceStorage->copyToStorage( xTargetStorage );
bRet = sal_True;
uno::Reference< XTransactedObject > xTransaction =
uno::Reference< XTransactedObject >( xTargetStorage, UNO_QUERY );
if( xTransaction.is() )
xTransaction->commit();
/////dispose them
uno::Reference< lang::XComponent > xComponent1( xSourceStorage, uno::UNO_QUERY
);
OSL_ENSURE( !xSourceStorage.is() || xComponent1.is(), "Wrong storage
implementation!" );
if ( xComponent1.is() )
xComponent1->dispose();
uno::Reference< lang::XComponent > xComponent2( xTargetStorage,
uno::UNO_QUERY );
OSL_ENSURE( !xTargetStorage.is() || xComponent2.is(), "Wrong storage
implementation!" );
if ( xComponent2.is() )
xComponent2->dispose();
////End
After the execution of filter( const Sequence< PropertyValue >& rDescriptor ),
the target file is created and the size of the file is about 7KB.
But after executing the following code in sal_Bool SfxObjectShell::SaveTo_Impl:
// transfer data to its destinated location
// the medium commits the storage or the stream it is based on
RegisterTransfer( rMedium );
bOk = rMedium.Commit();
the size of target file becomes 0 KB.
Why?
Is some thing wrong in my filter( const Sequence< PropertyValue >& rDescriptor
) function?
what should I do with the XStorage ?
Any help and sugestion in identifying the missing pieces is appreciated.
Thanks
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