实例介绍
【实例简介】PDFThumbnailCSharp
【实例截图】
【核心代码】
using System; using System.IO; using System.Drawing; using System.Configuration; using System.Windows.Forms; using System.Runtime.InteropServices; class PDFThumbnailCsharp { [STAThread] static void Main(string[] args) { // Acrobat objects Acrobat.CAcroPDDoc pdfDoc; Acrobat.CAcroPDPage pdfPage; Acrobat.CAcroRect pdfRect; Acrobat.CAcroPoint pdfPoint; AppSettingsReader appSettings = new AppSettingsReader(); string pdfInputPath = appSettings.GetValue("pdfInputPath", typeof(string)).ToString(); string pngOutputPath = appSettings.GetValue("pngOutputPath", typeof(string)).ToString(); string templatePortraitFile = Application.StartupPath @"\pdftemplate_portrait.gif"; string templateLandscapeFile = Application.StartupPath @"\pdftemplate_portrait.gif";; try { // Get list of files to process from the input path // Could change to read list from database instead string[] files = Directory.GetFiles(pdfInputPath, "*.pdf"); for (int n=0; n < files.Length; n ) { string inputFile = files[n].ToString(); string outputFile = pngOutputPath files[n].Substring(files[n].LastIndexOf(@"\") 1).Replace(".pdf", ".png"); /* Could skip if thumbnail already exists in output path FileInfo fi = new FileInfo(inputFile); if (!fi.Exists) {} */ // Create the document (Can only create the AcroExch.PDDoc object using late-binding) // Note using VisualBasic helper functions, have to add reference to DLL in // C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\Microsoft.VisualBasic.dll // Will always be available as .NET framework ships with all pdfDoc = (Acrobat.CAcroPDDoc) Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.PDDoc", ""); int ret = pdfDoc.Open(inputFile); if (ret == 0) { throw new FileNotFoundException(); } // Get the number of pages (to be used later if you wanted to store that information) int pageCount = pdfDoc.GetNumPages(); // Get the first page pdfPage = (Acrobat.CAcroPDPage)pdfDoc.AcquirePage(0); pdfPoint = (Acrobat.CAcroPoint)pdfPage.GetSize(); pdfRect = (Acrobat.CAcroRect) Microsoft.VisualBasic.Interaction.CreateObject("AcroExch.Rect", ""); pdfRect.Left = 0; pdfRect.right = pdfPoint.x; pdfRect.Top = 0; pdfRect.bottom = pdfPoint.y; // 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 // see http://www.adobe.com/support/techdocs/1dd72.htm pdfPage.CopyToClipboard(pdfRect, 0, 0, 100); IDataObject clipboardData = Clipboard.GetDataObject(); if (clipboardData.GetDataPresent(DataFormats.Bitmap)) { Bitmap pdfBitmap = (Bitmap)clipboardData.GetData(DataFormats.Bitmap); // Size of generated thumbnail in pixels int thumbnailWidth = 45; int thumbnailHeight = 59; string templateFile; // Switch between portrait and landscape if (pdfPoint.x < pdfPoint.y) { templateFile = templatePortraitFile; } else { templateFile = templateLandscapeFile; // Swap width and height (little trick not using third temp variable) thumbnailWidth = thumbnailWidth ^ thumbnailHeight; thumbnailHeight = thumbnailWidth ^ thumbnailHeight; thumbnailWidth = thumbnailWidth ^ thumbnailHeight; } // Load the template graphic Bitmap templateBitmap = new Bitmap(templateFile); // Render to small image using the bitmap class Image pdfImage = pdfBitmap.GetThumbnailImage(thumbnailWidth, thumbnailHeight, null, IntPtr.Zero); // Create new blank bitmap ( 7 for template border) Bitmap thumbnailBitmap = new Bitmap(thumbnailWidth 7, thumbnailHeight 7, System.Drawing.Imaging.PixelFormat.Format32bppArgb); // To overlayout the template with the image, we need to set the transparency // http://www.sellsbrothers.com/writing/default.aspx?content=dotnetimagerecoloring.htm templateBitmap.MakeTransparent(); using (Graphics thumbnailGraphics = Graphics.FromImage(thumbnailBitmap)) { // Draw rendered pdf image to new blank bitmap thumbnailGraphics.DrawImage(pdfImage, 2, 2, thumbnailWidth, thumbnailHeight); // Draw template outline over the bitmap (pdf with show through the transparent area) thumbnailGraphics.DrawImage(templateBitmap, 0, 0); // Save as .png file thumbnailBitmap.Save(outputFile, System.Drawing.Imaging.ImageFormat.Png); Console.WriteLine("Generated thumbnail... {0}", outputFile); } pdfDoc.Close(); // Not sure how why it is to do this, but Acrobat is not the best behaved COM object // see http://blogs.msdn.com/yvesdolc/archive/2004/04/17/115379.aspx Marshal.ReleaseComObject(pdfPage); Marshal.ReleaseComObject(pdfRect); Marshal.ReleaseComObject(pdfDoc); } } } catch (System.Exception ex) { Console.Write(ex.ToString()); } } }
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