C # .net PDF file preview

 

First reference O2S.Components.PDFRender4NET

(Cloud disk ready: link: https://pan.baidu.com/s/16l5ktVGdJeqdW1_ceydm4g    extraction code: xqmh)

Then the tag introduced

using O2S.Components.PDFRender4NET;

 

 

Core code

// picture sharpness, the larger the number the more clear 
public  enum Definition 
{ 
    One = . 1 , Two = 2 , Three = . 3 , Four = . 4 , Five = . 5 , Six = . 6 , Seven = . 7 , Eight = . 8 , Nine = . 9 , Ten = 10 
} 

// determines whether a file exists 
Private  BOOL FileIsExists ( String path) 
{ 
    iF (System.IO.File.Exists (path))
         return  to true ;
     the else 
        return  to false  ;
}


///  <the Summary> 
/// convert PDF documents to image method
 ///  </ the Summary> 
///  <param name = "pdfInputPath"> PDF File Path </ param> 
///  <param name = " imageOutputPath "> picture output path </ param> 
///  <param name =" imageName "> the name of generated image </ param> 
/// // <param name =" startPageNum "> starting from the first few pages of a PDF document conversion </ param> 
/// // <param name = "endPageNum"> from the first few pages of a PDF document conversion start stop </ param>        
/// // <param name = "definition"> set the picture sharpness the larger the number the more clear </param>
///// <param name="imageFormat">Setting the desired image format </ param>        
Private   String   ConvertPDF2Image ( String pdfInputPath, String imageOutputPath, String imageName) 
{ 
　　 // For testing purposes, the number of fixed parameters
     // format 
    ImageFormat imageFormat = ImageFormat.Jpeg;
     // definition 
    Definition = Definition Definition.Ten;
     // beginning and ending page 
    int startPageNum = 1 ;
     int endPageNum = 1 ;
     // generate the image name
     // String imageName = "the Test"; 

    pdfFile pdfFile = PDFFile.Open(pdfInputPath);
    if (!Directory.Exists(imageOutputPath))
    {
        Directory.CreateDirectory(imageOutputPath);
    }
    if (startPageNum <= 0)
    {
        startPageNum = 1;
    }
    if (endPageNum > pdfFile.PageCount)
    {
        endPageNum = pdfFile.PageCount;
    }
    if (startPageNum > endPageNum)
    {
        int tempPageNum = startPageNum;
        startPageNum = endPageNum;
        endPageNum= StartPageNum; 
    } 
    // Start to Convert each Page
　　// multi-page image generating sequential 
    String imageOutputRet = "" ;
     for ( int I = startPageNum; I <= endPageNum; I ++ ) 
    { 
        Bitmap pageImage = pdfFile.GetPageImage (I - . 1 , 56 is * ( int ) Definition); 
        imageOutputRet = imageOutputPath + imageName i.ToString + () + " . " + imageFormat.ToString ();
         /// / preventing duplicate image file temporarily with [] 
        // int. 1 = Sign;
         / /while(this.FileIsExists(imageOutputRet))//存在
        //{
        //    imageOutputRet = imageOutputPath + imageName + i.ToString() +"_"+sign.ToString() + "." + imageFormat.ToString();
        //    sign++;
        //}               
        pageImage.Save(imageOutputRet, imageFormat);
        pageImage.Dispose();
    }
    pdfFile.Dispose();
    return imageOutputRet;
}