PDF转图片
1、Acrobat方式
安装并引用Acrobat.dll
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Drawing.Imaging; using System.IO; using System.Drawing; using System.Runtime.InteropServices; using System.Windows.Forms; namespace WebGPS.Contract { public class Class2 { /// <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 DLL pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", ""); // validate parameter if (!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 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); } /// <summary> /// 将PDF文档转换为图片的方法 /// </summary> /// <param name="pdfInputPath">PDF文件路径</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="resolution">设置图片的分辨率，数字越大越清晰，默认值为1</param> public static Byte[] ConvertPDF2Image(string pdfInputPath, int endPageNum, double resolution) { var stream = new MemoryStream(); Acrobat.CAcroPDDoc pdfDoc = null; Acrobat.CAcroPDPage pdfPage = null; Acrobat.CAcroRect pdfRect = null; Acrobat.CAcroPoint pdfPoint = null; pdfDoc = (Acrobat.CAcroPDDoc)Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", ""); if (!pdfDoc.Open(pdfInputPath)) { throw new FileNotFoundException(); } if (endPageNum > pdfDoc.GetNumPages() || endPageNum <= 0) { endPageNum = pdfDoc.GetNumPages(); } if (resolution <= 0) { resolution = 1; } for (int i = 1; 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; 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(stream, ImageFormat.Jpeg); pdfBitmap.Dispose(); } } pdfDoc.Close(); Marshal.ReleaseComObject(pdfPage); Marshal.ReleaseComObject(pdfRect); Marshal.ReleaseComObject(pdfDoc); Marshal.ReleaseComObject(pdfPoint); return stream2byte(stream); } public static byte[] stream2byte(Stream stream) { byte[] buffer = new byte[stream.Length]; stream.Read(buffer, 0, buffer.Length); return buffer; } } }
2、Spire.Pdf.dll有水印
/// <summary> /// Spire.Pdf.dll /// </summary> private List<Image> PDF2Image1(byte[] bytes) { PdfDocument doc = new PdfDocument(bytes); var images = new List<Image>(); for (var i = 0; i < doc.Pages.Count; i++) { var pageImage = doc.SaveAsImage(i); images.Add(pageImage); } return images; }
3、O2S.Components.PDFRender4NET
/// <summary> /// O2S.Components.PDFRender4NET /// 印章丢失 /// 测试jpg、png，gif、bmp、jpeg、tif /// </summary> private void PDF2Image(byte[] bytes) { PDFFile pdfFile = PDFFile.Open(new MemoryStream(bytes)); var imageOutputPath = "E:\\"; var imageFormat = "tif"; for (int i = 0; i < pdfFile.PageCount; i++) { Bitmap pageImage = pdfFile.GetPageImage(i, 56 * 5); pageImage.Save(imageOutputPath + "djm" + i.ToString() + "." + imageFormat.ToString()); pageImage.Dispose(); } }
