将工作表转换为不同的图像格式

Aspose.Cells 允许您从工作簿导出工作表并将其转换为不同的图像格式。本文介绍如何将工作表转换为不同的图像格式。

将工作表转换为图像

工作表包含您要分析的数据。例如，工作表可以包含参数、总计、百分比、异常和计算。

作为开发人员，您可能需要将工作表显示为图像。例如，您可能需要在应用程序或网页中使用工作表的图像。您可能希望将图像插入到 Microsoft Word 文档、PDF 文件、PowerPoint 演示文稿或其他文档类型中。简而言之，您希望将工作表呈现为图像，以便您可以在其他地方使用它。

Aspose.Cells 支持将Excel工作表转换为图片。要使用此功能，您需要导入Aspose.Cells.Rendering命名空间到您的程序或项目。它有几个有价值的渲染和打印类，例如，表单渲染, IImageOrPrint选项和别的。

Aspose.Cells.Rendering.ISheetRender 类表示要呈现为图像的工作表。它有一个重载方法，印象，可以将工作表转换为具有不同属性或选项的图像文件。支持多种图像格式，例如 BMP、PNG、GIF、JPG、JPEG、TIFF、EMF。

以下代码片段显示了如何将 Excel 文件中的工作表转换为图像文件。

PNG 格式

请看下面的示例代码，其示例 Excel 文件 和输出 PNG 图片.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-C

// Source directory path.
StringPtr srcDir = new String("..\\Data\\01_SourceDirectory\\");

// Output directory path.
StringPtr outDir = new String("..\\Data\\02_OutputDirectory\\");

// Path of input Excel file.
StringPtr sampleConvertingWorksheetToDifferentImageFormats = srcDir->StringAppend(new String("sampleConvertingWorksheetToDifferentImageFormats.xlsx"));

// Create an empty workbook.
intrusive_ptr<Aspose::Cells::IWorkbook> workbook = Factory::CreateIWorkbook(sampleConvertingWorksheetToDifferentImageFormats);

// Access first worksheet.
intrusive_ptr<Aspose::Cells::IWorksheet> worksheet = workbook->GetIWorksheets()->GetObjectByIndex(0);

// Create image or print options object.
intrusive_ptr<Aspose::Cells::Rendering::IImageOrPrintOptions> imgOptions = Factory::CreateIImageOrPrintOptions();

// Specify the image format.
imgOptions->SetImageFormat(Aspose::Cells::Systems::Drawing::Imaging::ImageFormat::GetPng());

// Specify horizontal and vertical resolution
imgOptions->SetHorizontalResolution(200);
imgOptions->SetVerticalResolution(200);

// Render the sheet with respect to specified image or print options.
intrusive_ptr<Aspose::Cells::Rendering::ISheetRender> sr = Factory::CreateISheetRender(worksheet, imgOptions);

// Get page count.
Aspose::Cells::Systems::Int32 pageCount = sr->GetPageCount();

// Create string builder object for string concatenations.
intrusive_ptr<Aspose::Cells::Systems::Text::StringBuilder> sb = new Aspose::Cells::Systems::Text::StringBuilder();

// Render each page to png image one by one.
for (int i = 0; i < pageCount; i++)
{
	// Clear string builder and create output image path with string concatenations.
	sb->Clear();
	sb->Append(outDir);
	sb->Append((StringPtr)new String("outputConvertingWorksheetToImagePNG_"));
	sb->Append(i);
	sb->Append((StringPtr)new String(".png"));

	// Get the output image path.
	StringPtr outputPNG = sb->ToString();

	// Convert worksheet to png image.
	sr->ToImage(i, outputPNG);
}

TIFF 格式

请看下面的示例代码，其示例 Excel 文件 和输出 TIFF 图片.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-C

// Source directory path.
StringPtr srcDir = new String("..\\Data\\01_SourceDirectory\\");

// Output directory path.
StringPtr outDir = new String("..\\Data\\02_OutputDirectory\\");

// Path of input Excel file.
StringPtr sampleConvertingWorksheetToDifferentImageFormats = srcDir->StringAppend(new String("sampleConvertingWorksheetToDifferentImageFormats.xlsx"));

// Create an empty workbook.
intrusive_ptr<Aspose::Cells::IWorkbook> workbook = Factory::CreateIWorkbook(sampleConvertingWorksheetToDifferentImageFormats);

// Access first worksheet.
intrusive_ptr<Aspose::Cells::IWorksheet> worksheet = workbook->GetIWorksheets()->GetObjectByIndex(0);

// Create image or print options object.
intrusive_ptr<Aspose::Cells::Rendering::IImageOrPrintOptions> imgOptions = Factory::CreateIImageOrPrintOptions();

// Specify the image format.
imgOptions->SetImageFormat(Aspose::Cells::Systems::Drawing::Imaging::ImageFormat::GetTiff());

// Specify horizontal and vertical resolution
imgOptions->SetHorizontalResolution(200);
imgOptions->SetVerticalResolution(200);

// Render the sheet with respect to specified image or print options.
intrusive_ptr<Aspose::Cells::Rendering::ISheetRender> sr = Factory::CreateISheetRender(worksheet, imgOptions);

// Get the output image path.
StringPtr outputTiff = outDir->Append((StringPtr)new String("outputConvertingWorksheetToImageTiff.tiff"));

// Convert worksheet to tiff image.
sr->ToTiff(outputTiff);

将工作表转换为 SVG

SVG 代表可缩放矢量图形。 SVG是基于XML标准的二维矢量图形规范。它是一个开放标准，自 1999 年以来一直由万维网联盟 (W3C) 开发。

Aspose.Cells for C++ 从版本 18.5.0 开始可以将工作表转换为 SVG 图片。

要使用此功能，请将 Aspose.Cells.Rendering 命名空间导入您的程序或项目。它有几个用于渲染和打印的有价值的类，例如 ISheetRender、IImageOrPrintOptions 等。

Aspose.Cells.Rendering.IImageOrPrintOptions 类指定工作表将以 SVG 格式保存。以下代码片段显示如何将 Excel 文件中的工作表转换为 SVG 图像文件

请看下面的示例代码，其示例 Excel 文件 和输出 SVG 图片.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-C

// Source directory path.
StringPtr srcDir = new String("..\\Data\\01_SourceDirectory\\");

// Output directory path.
StringPtr outDir = new String("..\\Data\\02_OutputDirectory\\");

// Path of input Excel file.
StringPtr sampleConvertingWorksheetToDifferentImageFormats = srcDir->StringAppend(new String("sampleConvertingWorksheetToDifferentImageFormats.xlsx"));

// Create an empty workbook.
intrusive_ptr<Aspose::Cells::IWorkbook> workbook = Factory::CreateIWorkbook(sampleConvertingWorksheetToDifferentImageFormats);

// Access first worksheet.
intrusive_ptr<Aspose::Cells::IWorksheet> worksheet = workbook->GetIWorksheets()->GetObjectByIndex(0);

// Create image or print options object.
intrusive_ptr<Aspose::Cells::Rendering::IImageOrPrintOptions> imgOptions = Factory::CreateIImageOrPrintOptions();

// Specify horizontal and vertical resolution
imgOptions->SetHorizontalResolution(200);
imgOptions->SetVerticalResolution(200);

// Specify the save format.
imgOptions->SetSaveFormat(Aspose::Cells::SaveFormat::SaveFormat_SVG);

// Render the sheet with respect to specified image or print options.
intrusive_ptr<Aspose::Cells::Rendering::ISheetRender> sr = Factory::CreateISheetRender(worksheet, imgOptions);

// Get page count.
Aspose::Cells::Systems::Int32 pageCount = sr->GetPageCount();

// Create string builder object for string concatenations.
intrusive_ptr<Aspose::Cells::Systems::Text::StringBuilder> sb = new Aspose::Cells::Systems::Text::StringBuilder();

// Render each page to png image one by one.
for (int i = 0; i < pageCount; i++)
{
	// Clear string builder and create output image path with string concatenations.
	sb->Clear();
	sb->Append(outDir);
	sb->Append((StringPtr)new String("outputConvertingWorksheetToImageSVG_"));
	sb->Append(i);
	sb->Append((StringPtr)new String(".svg"));

	// Get the output image path.
	StringPtr outputSVG = sb->ToString();

	// Convert worksheet to tiff image.
	sr->ToImage(i, outputSVG);
}