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/// <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>
public static void 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 DLLpdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", "");// validate parameterif (!pdfDoc.Open(pdfInputPath)) { throw new 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 pagefor (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 textpdfPage.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);
}