插入 Checkboxes、文本输入或图像

合并引擎将文档作为输入，查找 MERGEFIELD 中的字段，并将其替换为从数据源获取的数据。 通常，纯文本和 HTML 被插入，但 Aspose.Words 用户还可以生成一个文档，用于处理更不寻常的情况 Mail Merge 菲尔兹。

强大 Aspose.Words 功能允许您扩展 Mail Merge 过程:

• 在文档中插入复选框和文本输入表单字段 mail merge
• 从任何自定义存储（文件）插入图像, BLOB 领域等。)

插入 Checkboxes和文本输入期间 Mail Merge

有时有必要执行一个 Mail Merge 操作，以便在合并字段中代替的不是文本，而是复选框或文本输入字段。 尽管这不是最常见的情况，但它对于某些任务来说非常方便。

Word文档的以下屏幕截图显示了具有合并字段的模板:

下面Word文档的此屏幕截图显示了已经生成的文档:

请注意，一些字段被替换为纯文本，一些字段被替换为复选框表单字段，以及 Subject 字段被替换为文本输入字段。

下面的代码示例演示如何在文档中插入复选框和输入文本字段 mail merge:

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
auto doc = MakeObject<Document>(MyDir + u"Mail merge destinations - Fax.docx");

// Setup mail merge event handler to do the custom work.
doc->get_MailMerge()->set_FieldMergingCallback(MakeObject<WorkingWithFields_::HandleMergeField>());
// Trim trailing and leading whitespaces mail merge values.
doc->get_MailMerge()->set_TrimWhitespaces(false);

ArrayPtr<String> fieldNames =
    MakeArray<String>({u"RecipientName", u"SenderName", u"FaxNumber", u"PhoneNumber", u"Subject", u"Body", u"Urgent", u"ForReview", u"PleaseComment"});

ArrayPtr<SharedPtr<System::Object>> fieldValues = MakeArray<SharedPtr<System::Object>>(
    {System::ObjectExt::Box<String>(u"Josh"), System::ObjectExt::Box<String>(u"Jenny"), System::ObjectExt::Box<String>(u"123456789"),
     System::ObjectExt::Box<String>(u""), System::ObjectExt::Box<String>(u"Hello"), System::ObjectExt::Box<String>(u"<b>HTML Body Test message 1</b>"),
     System::ObjectExt::Box<bool>(true), System::ObjectExt::Box<bool>(false), System::ObjectExt::Box<bool>(true)});

doc->get_MailMerge()->Execute(fieldNames, fieldValues);

doc->Save(ArtifactsDir + u"WorkingWithFields.MailMergeFormFields.docx");

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
class HandleMergeField : public IFieldMergingCallback
{
private:
    SharedPtr<DocumentBuilder> mBuilder;

    /// <summary>
    /// This handler is called for every mail merge field found in the document,
    /// for every record found in the data source.
    /// </summary>
    void FieldMerging(SharedPtr<FieldMergingArgs> e) override
    {
        if (mBuilder == nullptr)
        {
            mBuilder = MakeObject<DocumentBuilder>(e->get_Document());
        }

        // We decided that we want all boolean values to be output as check box form fields.
        if (System::ObjectExt::Is<bool>(e->get_FieldValue()))
        {
            // Move the "cursor" to the current merge field.
            mBuilder->MoveToMergeField(e->get_FieldName());

            String checkBoxName = String::Format(u"{0}{1}", e->get_FieldName(), e->get_RecordIndex());

            mBuilder->InsertCheckBox(checkBoxName, System::ObjectExt::Unbox<bool>(e->get_FieldValue()), 0);

            return;
        }

        if (e->get_FieldName() == u"Body")
        {
            mBuilder->MoveToMergeField(e->get_FieldName());
            mBuilder->InsertHtml(System::ObjectExt::Unbox<String>(e->get_FieldValue()));
        }
        else if (e->get_FieldName() == u"Subject")
        {
            mBuilder->MoveToMergeField(e->get_FieldName());
            String textInputName = String::Format(u"{0}{1}", e->get_FieldName(), e->get_RecordIndex());
            mBuilder->InsertTextInput(textInputName, TextFormFieldType::Regular, u"", System::ObjectExt::Unbox<String>(e->get_FieldValue()), 0);
        }
    }

    void ImageFieldMerging(SharedPtr<ImageFieldMergingArgs> args) override
    {
        args->set_ImageFileName(u"Image.png");
        args->get_ImageWidth()->set_Value(200);
        args->set_ImageHeight(MakeObject<MergeFieldImageDimension>(200, MergeFieldImageDimensionUnit::Percent));
    }
};

期间插入图像 Mail Merge

当执行 Mail Merge 操作，您可以使用特殊图像将数据库中的图像插入到文档中 Mail Merge 菲尔兹。 图像 Mail Merge field是一个名为Image的合并字段:MyFieldName.

从数据库中插入图像

在一个 mail merge，当图像 Mail Merge 字段在文档中遇到， FieldMergingCallback 事件被触发。 您可以响应此事件以将文件名、流或图像对象返回到 Mail Merge 引擎，以便它可以插入到文档中。

下面的代码示例演示如何插入存储在数据库中的图像 BLOB 字段到报告中:

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
auto doc = MakeObject<Document>();
auto builder = MakeObject<DocumentBuilder>(doc);

// MERGEFIELDs with "Image:" tags will receive an image during a mail merge.
// The string after the colon in the "Image:" tag corresponds to a column name
// in the data source whose cells contain URIs of image files.
builder->InsertField(u"MERGEFIELD  Image:logo_FromWeb ");
builder->InsertField(u"MERGEFIELD  Image:logo_FromFileSystem ");

// Create a data source that contains URIs of images that we will merge.
// A URI can be a web URL that points to an image, or a local file system filename of an image file.
ArrayPtr<String> columns = MakeArray<String>({u"logo_FromWeb", u"logo_FromFileSystem"});
ArrayPtr<SharedPtr<System::Object>> URIs =
    MakeArray<SharedPtr<System::Object>>({System::ObjectExt::Box<String>(ImageUrl), System::ObjectExt::Box<String>(ImageDir + u"Logo.jpg")});

// Execute a mail merge on a data source with one row.
doc->get_MailMerge()->Execute(columns, URIs);

doc->Save(ArtifactsDir + u"MailMergeEvent.ImageFromUrl.docx");

期间设置图像属性 Mail Merge

在合并图像合并字段时，有时可能需要控制各种图像属性，例如 WrapType.

目前，使用 ImageFieldMergingArgs 您只能分别设置图像宽度或高度属性。 为了克服这个问题, Aspose.Words 提供 Shape 属性，这便于获得对插入的图像或任何其他形状的完全控制。

下面的代码示例演示如何设置各种图像属性:

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
auto doc = MakeObject<Document>();
auto builder = MakeObject<DocumentBuilder>(doc);

builder->Writeln(u"{{#foreach example}}");
builder->Writeln(u"{{Image(126pt;126pt):stempel}}");
builder->Writeln(u"{{/foreach example}}");

doc->get_MailMerge()->set_UseNonMergeFields(true);
doc->get_MailMerge()->set_TrimWhitespaces(true);
doc->get_MailMerge()->set_UseWholeParagraphAsRegion(false);
doc->get_MailMerge()->set_CleanupOptions(MailMergeCleanupOptions::RemoveEmptyTableRows | MailMergeCleanupOptions::RemoveContainingFields |
                                         MailMergeCleanupOptions::RemoveUnusedRegions | MailMergeCleanupOptions::RemoveUnusedFields);

doc->get_MailMerge()->set_FieldMergingCallback(MakeObject<WorkingWithFields_::ImageFieldMergingHandler>());
doc->get_MailMerge()->ExecuteWithRegions(MakeObject<WorkingWithFields_::DataSourceRoot>());

doc->Save(ArtifactsDir + u"WorkingWithFields.MailMergeImageField.docx");

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
class ImageFieldMergingHandler : public IFieldMergingCallback
{
private:
    void FieldMerging(SharedPtr<FieldMergingArgs> args) override
    {
        ASPOSE_UNUSED(args);
        //  Implementation is not required.
    }

    void ImageFieldMerging(SharedPtr<ImageFieldMergingArgs> args) override
    {
        auto shape = MakeObject<Shape>(args->get_Document(), ShapeType::Image);
        shape->set_Width(126);
        shape->set_Height(126);
        shape->set_WrapType(WrapType::Square);

        shape->get_ImageData()->SetImage(MyDir + u"Mail merge image.png");

        args->set_Shape(shape);
    }
};

//For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-C
class DataSourceRoot : public IMailMergeDataSourceRoot
{
private:
    class DataSource : public IMailMergeDataSource
    {
    public:
        bool MoveNext() override
        {
            bool result = next;
            next = false;
            return result;
        }

        SharedPtr<IMailMergeDataSource> GetChildDataSource(String s) override
        {
            ASPOSE_UNUSED(s);
            return nullptr;
        }

        bool GetValue(String fieldName, SharedPtr<System::Object>& fieldValue) override
        {
            ASPOSE_UNUSED(fieldName);
            fieldValue.reset();
            return false;
        }

        DataSource() : next(true)
        {
        }

    private:
        bool next;

        String get_TableName() override
        {
            return TableName();
        }

        String TableName()
        {
            return u"example";
        }
    };

public:
    SharedPtr<IMailMergeDataSource> GetDataSource(String s) override
    {
        ASPOSE_UNUSED(s);
        return MakeObject<WorkingWithFields_::DataSourceRoot::DataSource>();
    }
};