Aspose::Words::Saving::DocumentPartSavingArgs::get_DocumentPartStream method

DocumentPartSavingArgs::get_DocumentPartStream method

Allows to specify the stream where the document part will be saved to.

System::SharedPtr<System::IO::Stream> Aspose::Words::Saving::DocumentPartSavingArgs::get_DocumentPartStream() const

Remarks

This property allows you to save document parts to streams instead of files during HTML export.

The default value is null. When this property is null, the document part will be saved to a file specified in the DocumentPartFileName property.

When saving to a stream in HTML format is requested by Save() or Save() and first document part is about to be saved, Aspose.Words suggests here the main output stream initially passed by the caller.

When saving to EPUB format that is a container format based on HTML, DocumentPartStream cannot be specified because all subsidiary parts will be encapsulated into a single output package.

Examples

Shows how to split a document into parts and save them.

void DocumentPartsFileNames()
{
    auto doc = MakeObject<Document>(MyDir + u"Rendering.docx");
    String outFileName = u"SavingCallback.DocumentPartsFileNames.html";

    // Create an "HtmlFixedSaveOptions" object, which we can pass to the document's "Save" method
    // to modify how we convert the document to HTML.
    auto options = MakeObject<HtmlSaveOptions>();

    // If we save the document normally, there will be one output HTML
    // document with all the source document's contents.
    // Set the "DocumentSplitCriteria" property to "DocumentSplitCriteria.SectionBreak" to
    // save our document to multiple HTML files: one for each section.
    options->set_DocumentSplitCriteria(DocumentSplitCriteria::SectionBreak);

    // Assign a custom callback to the "DocumentPartSavingCallback" property to alter the document part saving logic.
    options->set_DocumentPartSavingCallback(MakeObject<ExSavingCallback::SavedDocumentPartRename>(outFileName, options->get_DocumentSplitCriteria()));

    // If we convert a document that contains images into html, we will end up with one html file which links to several images.
    // Each image will be in the form of a file in the local file system.
    // There is also a callback that can customize the name and file system location of each image.
    options->set_ImageSavingCallback(MakeObject<ExSavingCallback::SavedImageRename>(outFileName));

    doc->Save(ArtifactsDir + outFileName, options);
}

class SavedDocumentPartRename : public IDocumentPartSavingCallback
{
public:
    SavedDocumentPartRename(String outFileName, DocumentSplitCriteria documentSplitCriteria)
        : mCount(0), mDocumentSplitCriteria(((Aspose::Words::Saving::DocumentSplitCriteria)0))
    {
        mOutFileName = outFileName;
        mDocumentSplitCriteria = documentSplitCriteria;
    }

private:
    int mCount;
    String mOutFileName;
    DocumentSplitCriteria mDocumentSplitCriteria;

    void DocumentPartSaving(SharedPtr<DocumentPartSavingArgs> args) override
    {
        // We can access the entire source document via the "Document" property.
        ASSERT_TRUE(args->get_Document()->get_OriginalFileName().EndsWith(u"Rendering.docx"));

        String partType = String::Empty;

        switch (mDocumentSplitCriteria)
        {
        case DocumentSplitCriteria::PageBreak:
            partType = u"Page";
            break;

        case DocumentSplitCriteria::ColumnBreak:
            partType = u"Column";
            break;

        case DocumentSplitCriteria::SectionBreak:
            partType = u"Section";
            break;

        case DocumentSplitCriteria::HeadingParagraph:
            partType = u"Paragraph from heading";
            break;

        default:
            break;
        }

        String partFileName = String::Format(u"{0} part {1}, of type {2}{3}", mOutFileName, ++mCount, partType,
                                             System::IO::Path::GetExtension(args->get_DocumentPartFileName()));

        // Below are two ways of specifying where Aspose.Words will save each part of the document.
        // 1 -  Set a filename for the output part file:
        args->set_DocumentPartFileName(partFileName);

        // 2 -  Create a custom stream for the output part file:
        args->set_DocumentPartStream(MakeObject<System::IO::FileStream>(ArtifactsDir + partFileName, System::IO::FileMode::Create));

        ASSERT_TRUE(args->get_DocumentPartStream()->get_CanWrite());
        ASSERT_FALSE(args->get_KeepDocumentPartStreamOpen());
    }
};

class SavedImageRename : public IImageSavingCallback
{
public:
    SavedImageRename(String outFileName) : mCount(0)
    {
        mOutFileName = outFileName;
    }

private:
    int mCount;
    String mOutFileName;

    void ImageSaving(SharedPtr<ImageSavingArgs> args) override
    {
        String imageFileName = String::Format(u"{0} shape {1}, of type {2}{3}", mOutFileName, ++mCount, args->get_CurrentShape()->get_ShapeType(),
                                              System::IO::Path::GetExtension(args->get_ImageFileName()));

        // Below are two ways of specifying where Aspose.Words will save each part of the document.
        // 1 -  Set a filename for the output image file:
        args->set_ImageFileName(imageFileName);

        // 2 -  Create a custom stream for the output image file:
        args->set_ImageStream(MakeObject<System::IO::FileStream>(ArtifactsDir + imageFileName, System::IO::FileMode::Create));

        ASSERT_TRUE(args->get_ImageStream()->get_CanWrite());
        ASSERT_TRUE(args->get_IsImageAvailable());
        ASSERT_FALSE(args->get_KeepImageStreamOpen());
    }
};

See Also

Aspose::Words::Saving::DocumentPartSavingArgs::get_DocumentPartFileName method Aspose::Words::Saving::DocumentPartSavingArgs::get_KeepDocumentPartStreamOpen method