Is it possible to convert PDF page to Image using itextSharp?

问题

Hi I have been using itextSharp for all pdf related projects in dot.net. I came across a requirement where I need to convert PDF pages to images. I could not find any sample of such a thing. I found that another tool ghostscript is able to do it the problem with that is I am on a shared hosting & I don't think ghostscript will run on server as in my local machine I had to manually copy ghost script dlls to system32 folder which is not possible in a shared hosting.

回答1:

Ok I searched all over and found out that there is a nuget package for Ghost Script, so problem for me was solved by going to package manager console and adding ghost script to fresh project (I created a fresh project since the old one had all kinds of reference to win32 ghostscript dlls) by "PM> Install-Package Ghostscript.NET". So the answer to my question is: 1.> itextSharp cannot directly convert PDF pages to image. 2.> The "Ghostscript.NET 1.2.0" does it quite easily. Following is a code example.

    public void LoadImage(string InputPDFFile,int PageNumber)
    {

        string outImageName = Path.GetFileNameWithoutExtension(InputPDFFile);
        outImageName = outImageName+"_"+PageNumber.ToString() + "_.png";


        GhostscriptPngDevice dev = new GhostscriptPngDevice(GhostscriptPngDeviceType.Png256);
        dev.GraphicsAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
        dev.TextAlphaBits = GhostscriptImageDeviceAlphaBits.V_4;
        dev.ResolutionXY = new GhostscriptImageDeviceResolution(290, 290);
        dev.InputFiles.Add(InputPDFFile);
        dev.Pdf.FirstPage = PageNumber;
        dev.Pdf.LastPage = PageNumber;
        dev.CustomSwitches.Add("-dDOINTERPOLATE");
        dev.OutputPath = Server.MapPath(@"~/tempImages/" + outImageName);
        dev.Process();

    }

来源：https://stackoverflow.com/questions/30456317/is-it-possible-to-convert-pdf-page-to-image-using-itextsharp

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