调用 wkhtmltopdf 从 HTML 生成 PDF [英] Calling wkhtmltopdf to generate PDF from HTML

问题描述

我正在尝试从 HTML 文件创建 PDF 文件.环顾四周后，我发现:wkhtmltopdf 是完美的.我需要从 ASP.NET 服务器调用这个 .exe.我已经尝试过:

I'm attempting to create a PDF file from an HTML file. After looking around a little I've found: wkhtmltopdf to be perfect. I need to call this .exe from the ASP.NET server. I've attempted:

    Process p = new Process();
    p.StartInfo.UseShellExecute = false;
    p.StartInfo.FileName = HttpContext.Current.Server.MapPath("wkhtmltopdf.exe");
    p.StartInfo.Arguments = "TestPDF.htm TestPDF.pdf";
    p.Start();
    p.WaitForExit();

在服务器上创建任何文件都没有成功.谁能给我一个正确方向的指针?我将 wkhtmltopdf.exe 文件放在站点的顶级目录中.还有其他地方应该举行吗?

With no success of any files being created on the server. Can anyone give me a pointer in the right direction? I put the wkhtmltopdf.exe file at the top level directory of the site. Is there anywhere else it should be held?

如果有人有更好的解决方案来从 html 动态创建 pdf 文件，请告诉我.

If anyone has better solutions to dynamically create pdf files from html, please let me know.

推荐答案

更新:
我在下面的回答是在磁盘上创建 pdf 文件.然后我将该文件作为下载流式传输到用户浏览器.考虑使用下面 Hath 的回答之类的方法来让 wkhtml2pdf 输出到流，然后将其直接发送给用户 - 这将绕过许多文件权限等问题.

Update:
My answer below, creates the pdf file on the disk. I then streamed that file to the users browser as a download. Consider using something like Hath's answer below to get wkhtml2pdf to output to a stream instead and then send that directly to the user - that will bypass lots of issues with file permissions etc.

我原来的回答:
确保您已为服务器上运行的 IIS 的 ASP.NET 进程(我认为通常是 NETWORK_SERVICE)指定了可写入的 PDF 输出路径.

My original answer:
Make sure you've specified an output path for the PDF that is writeable by the ASP.NET process of IIS running on your server (usually NETWORK_SERVICE I think).

我的看起来像这样(并且有效):

Mine looks like this (and it works):

/// <summary>
/// Convert Html page at a given URL to a PDF file using open-source tool wkhtml2pdf
/// </summary>
/// <param name="Url"></param>
/// <param name="outputFilename"></param>
/// <returns></returns>
public static bool HtmlToPdf(string Url, string outputFilename)
{
    // assemble destination PDF file name
    string filename = ConfigurationManager.AppSettings["ExportFilePath"] + "\" + outputFilename + ".pdf";

    // get proj no for header
    Project project = new Project(int.Parse(outputFilename));

    var p = new System.Diagnostics.Process();
    p.StartInfo.FileName = ConfigurationManager.AppSettings["HtmlToPdfExePath"];

    string switches = "--print-media-type ";
    switches += "--margin-top 4mm --margin-bottom 4mm --margin-right 0mm --margin-left 0mm ";
    switches += "--page-size A4 ";
    switches += "--no-background ";
    switches += "--redirect-delay 100";

    p.StartInfo.Arguments = switches + " " + Url + " " + filename;

    p.StartInfo.UseShellExecute = false; // needs to be false in order to redirect output
    p.StartInfo.RedirectStandardOutput = true;
    p.StartInfo.RedirectStandardError = true;
    p.StartInfo.RedirectStandardInput = true; // redirect all 3, as it should be all 3 or none
    p.StartInfo.WorkingDirectory = StripFilenameFromFullPath(p.StartInfo.FileName);

    p.Start();

    // read the output here...
    string output = p.StandardOutput.ReadToEnd(); 

    // ...then wait n milliseconds for exit (as after exit, it can't read the output)
    p.WaitForExit(60000); 

    // read the exit code, close process
    int returnCode = p.ExitCode;
    p.Close(); 

    // if 0 or 2, it worked (not sure about other values, I want a better way to confirm this)
    return (returnCode == 0 || returnCode == 2);
}

这篇关于调用 wkhtmltopdf 从 HTML 生成 PDF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！