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【CSharp】实现PDF转图片

作者:dezai / 发布于2014/6/6/ 642

首先就是利用word本身自带的转为pdf格式的文件，再通过Adobe官方Acrobat提供的接口实现该功能。


	/// <summary>
	/// 将PDF文档转换为图片的方法，你可以像这样调用该方法：ConvertPDF2Image("F:\\A.pdf", "F:\\", "A", 0, 0, null, 0);
	/// 因为大多数的参数都有默认值，startPageNum默认值为1，endPageNum默认值为总页数，
	/// imageFormat默认值为ImageFormat.Jpeg，resolution默认值为1
	/// </summary>
	/// <param name="pdfInputPath">PDF文件路径</param>
	/// <param name="imageOutputPath">图片输出路径</param>
	/// <param name="imageName">图片的名字，不需要带扩展名</param>
	/// <param name="startPageNum">从PDF文档的第几页开始转换，默认值为1</param>
	/// <param name="endPageNum">从PDF文档的第几页开始停止转换，默认值为PDF总页数</param>
	/// <param name="imageFormat">设置所需图片格式</param>
	/// <param name="resolution">设置图片的分辨率，数字越大越清晰，默认值为1</param>
	publicstaticvoid ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
	string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, double resolution)
	{
	Acrobat.CAcroPDDoc pdfDoc = null;
	Acrobat.CAcroPDPage pdfPage = null;
	Acrobat.CAcroRect pdfRect = null;
	Acrobat.CAcroPoint pdfPoint = null;

	// Create the document (Can only create the AcroExch.PDDoc object using late-binding)
	// Note using VisualBasic helper functions, have to add reference to DLL
	pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");

	// validate parameter
	if (!pdfDoc.Open(pdfInputPath)) { thrownew FileNotFoundException(); }
	if (!Directory.Exists(imageOutputPath)) { Directory.CreateDirectory(imageOutputPath); }
	if (startPageNum <= 0) { startPageNum = 1; } if (endPageNum > pdfDoc.GetNumPages() || endPageNum <= 0) { endPageNum = pdfDoc.GetNumPages(); } if (startPageNum > endPageNum) { int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum; }
	if (imageFormat == null) { imageFormat = ImageFormat.Jpeg; }
	if (resolution <= 0) { resolution = 1; }

	// start to convert each page
	for (int i = startPageNum; i <= endPageNum; i++)
	{
	pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(i - 1);
	pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize();
	pdfRect = (Acrobat.CAcroRect)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", "");

	int imgWidth = (int)((double)pdfPoint.x * resolution);
	int imgHeight = (int)((double)pdfPoint.y * resolution);

	pdfRect.Left = 0;
	pdfRect.right = (short)imgWidth;
	pdfRect.Top = 0;
	pdfRect.bottom = (short)imgHeight;

	// Render to clipboard, scaled by 100 percent (ie. original size)
	// Even though we want a smaller image, better for us to scale in .NET
	// than Acrobat as it would greek out small text
	pdfPage.CopyToClipboard(pdfRect, 0, 0, (short)(100 * resolution));

	IDataObject clipboardData = Clipboard.GetDataObject();

	if (clipboardData.GetDataPresent(DataFormats.Bitmap))
	{
	Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap);
	pdfBitmap.Save(Path.Combine(imageOutputPath, imageName) + ".jpg", imageFormat);
	pdfBitmap.Dispose();
	}
	}

	pdfDoc.Close();
	Marshal.ReleaseComObject(pdfPage);
	Marshal.ReleaseComObject(pdfRect);
	Marshal.ReleaseComObject(pdfDoc);
	Marshal.ReleaseComObject(pdfPoint);
	}

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