Ghostscript.NET pdf图像无法在windows azure上工作

Question

我正在尝试使用Ghostscript.NET将pdf第一页转换为图像,它在本地IIS上正常工作但在Azure Web应用程序上失败并出现以下错误:

[GhostscriptException:无法为符号'gsapi_revision'创建导出函数的委托]
Ghostscript.NET.GhostscriptLibrary.Initialize()+ 865
Ghostscript.NET.GhostscriptLibrary..ctor(GhostscriptVersionInfo version,Boolean fromMemory)+178
Ghostscript.NET .Interpreter.GhostscriptInterpreter..ctor(GhostscriptVersionInfo version,Boolean fromMemory)+48
Ghostscript.NET.Viewer.GhostscriptViewer.Open(String path,GhostscriptVersionInfo versionInfo,Boolean dllFromMemory)+75
Ghostscript.NET.Viewer.GhostscriptViewer.Open(Stream stream, GhostscriptVersionInfo versionInfo,Boolean dllFromMemory)+59
Ghostscript.NET.Rasterizer.GhostscriptRasterizer.Open(Stream stream,GhostscriptVersionInfo versionInfo,Boolean dllFromMemory)+40
VirtualWindow.Dropzone.Pages.Home.btnUpload_Click(Object sender,EventArgs e)+270
System.Web.UI.WebControls.Button.OnClick (EventArgs e)+116
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)+108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)+12
System. Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,String eventArgument)+15
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)+31 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,Boolean includeStagesAfterAsyncPoint)+3582

我的代码如下

protected void btnUpload_Click(object sender, EventArgs e)
{
    if (fileUpload.HasFile)
    {
        string ghostDllPath = HttpContext.Current.Server.MapPath("~/bin/External");
        GhostscriptRasterizer rasterizer = null;
        GhostscriptVersionInfo vesion = null;
        if (Environment.Is64BitProcess)
            vesion = new Ghostscript.NET.GhostscriptVersionInfo(new Version(0, 0, 0), ghostDllPath + @"\gsdll64.dll", string.Empty, Ghostscript.NET.GhostscriptLicense.GPL);
        else
            vesion = new Ghostscript.NET.GhostscriptVersionInfo(new Version(0, 0, 0), ghostDllPath + @"\gsdll32.dll", string.Empty, Ghostscript.NET.GhostscriptLicense.GPL);
        using (rasterizer = new Ghostscript.NET.Rasterizer.GhostscriptRasterizer())
        {
            rasterizer.Open(fileUpload.PostedFile.InputStream, vesion, false);
            if (rasterizer.PageCount > 0)
            {
                  int dpi = 90;
                  System.Drawing.Image img = rasterizer.GetPage(dpi, dpi, 1);
                  using (MemoryStream ms = new MemoryStream())
                  {
                       string file = Guid.NewGuid().ToString() + ".png";
                       img.Save(ms, ImageFormat.Png);
                       Response.ContentType = "image/png";
                       byte[] data = ms.ToArray();
                       Response.OutputStream.Write(data, 0, data.Length);
                       Response.AddHeader("Content-Disposition", "attachment;filename=" + file);
                       Response.Flush();
                   }
            }
            rasterizer.Close();
        }   
    }
}

我做错了什么？

Answer 1

好的找到问题了。包括路径在内的所有内容均已正确设置。我的网站采用免费计划托管，因此配置为 32 位环境。我的本地环境是 64 位，可以正常工作。于是我重新下载了gsdll32.dll. 更新了 azure，它也开始在 azure 上运行。

问题是错误的gsdll32.dll。