Convert pdf to jpg format

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There are a lot of software for converting pdf files into jpg files on the Internet, but this is a small feature, so open-source software is used. In. I use one of them, GhostScript, which is relatively simple ~

First, create a new class library, put the gsdll32.dll and consumer view. dll of the GhostScript we need to use in the bin directory, and then create a consumer convert. cs class,

View Code

1 // <summary> 2 // convert a single-page pdf file to an image 3 /// </summary> 4 /// <param name = "PDFPath"> PDF file path </param> 5 // <param name = "Page"> Page number to be converted </param> 6 /// <returns> </returns> 7 private byte [] GetImgData (string PDFPath, int Page) 8 {9 System. drawing. image img = lateral view. convertPDF. PDFConvert. getPageFromPDF (PDFPath, Page, 300, "", true); 10 return GetDataByImg (img); // read img data and return 11}

View Code

1 /// <summary> 2 /// convert the image into a byte stream 3 /// </summary> 4 /// <param name = "_ image"> </param> 5 // <returns> </returns> 6 private byte [] GetDataByImg (System. drawing. image _ image) 7 {8 System. IO. memoryStream MS = new MemoryStream (); 9 _ image. save (MS, System. drawing. imaging. imageFormat. jpeg); 10 byte [] imgdata = new byte [Ms. length]; 11 Ms. position = 0; 12 Ms. read (imgdata, 0, Convert. toInt32 (Ms. length); 13 Ms. close (); 14 return imgdata; 15}

View Code

1 // <summary> 2 // convert the corresponding PDF page to image 3 /// </summary> 4 /// <param name = "strPDFpath"> PDF path </param> 5 public string [] GetImage (string strPDFpath) 6 {7 FileStream fs = new FileStream (strPDFpath, FileMode. open, FileAccess. read); 8 StreamReader r = new StreamReader (fs); 9 string plain text = r. readToEnd (); 10 string filename = string. empty; // file suffix 11 string [] imgpath; 12 13 if (strPDFpath. contains ("\") 14 {15 string [] arr = strPDFpath. split ('\'); 16 filename = arr [arr. length-1]; 17} 18 else19 {20 string [] arr = strPDFpath. split ('/'); 21 filename = arr [arr. length-1]; 22} 23 filename = filename. remove (filename. length-System. IO. path. getExtension (filename ). length); 24 Regex rx1 = new Regex (@ "/Type \ s */Page [^ s]"); // determine the number of pages of a pdf. The regular expression 25 MatchCollection matches = rx1.Matches (plain text); 26 int PDFPageCount = Convert. toInt32 (matches. count); 27 try28 {29 if (PDFPageCount> 0) 30 {31 imgpath = new string [PDFPageCount]; 32 FileInfo file = new FileInfo (strPDFpath); 33 string strSavePath = file. directory. fullName; 34 for (int I = 1; I <= PDFPageCount; I ++) 35 {36 byte [] ImgData = GetImgData (strPDFpath, I ); 37 38 MemoryStream MS = new MemoryStream (ImgData, 0, ImgData. length); 39 Bitmap returnImage = (Bitmap) Bitmap. fromStream (MS); 40 41 string strImgPath = Path. combine (strSavePath, string. format (filename + "201702.16.jpg", I); 42 returnImage. save (strImgPath); 43 imgpath [I-1] = strImgPath; 44} 45 return imgpath; 46} 47 return null; 48} 49 catch (Exception ex) 50 {51 52 throw ex; 53} 54 55}

Click Generate solution. The dll file will be generated. In the new project, you can add this dll to reference the first two dll files!