是否有可能使用iTextSharp的将PDF页面转换为图像？ [英] Is it possible to convert PDF page to Image using itextSharp?

问题描述

您好我一直在使用iTextSharp的在dot.net所有PDF相关的项目。
我碰到，我需要的PDF页面转换为图像的要求。
我找不到这样的事情任何样品。我发现，另一种工具的ghostscript能够做到这一点的问题，那就是我是一个共享的主机和功放;我不认为Ghostscript可在服务器上运行在我的本地机器我不得不手动复制鬼脚本DLL文件，这是不可能在一个共享的主机system32目录。

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.

推荐答案

好吧，我找遍了，发现有一个的NuGet包鬼脚本，所以对我来说问题通过将程序包管理器控制台，并添加鬼脚本新鲜项目解决了（我创建一个新的项目，因为旧的PM>安装封装Ghostscript.NET有各种参考到Win32 DLL文件的Ghostscript）。
所以，回答我的问题是：
1> iTextSharp的不能直接PDF页面转换为图像。
2>在Ghostscript.NET 1.2.0它很容易。下面是一个代码示例。

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();

    }

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