TuesPechkin unable to load DLL 'wkhtmltox.dll'

If you are getting this error -> Could not load file or assembly 'TuesPechkin.Wkhtmltox.Win64' or one of its dependencies. An attempt was made to load a program with an incorrect format.

In Visual Studio Go to -

Tools -> Options -> Projects and Solutions -> Web Projects -> Use the 64 bit version of IIS Express for web sites and projects.

I installed TuesPechkin.Wkhtmltox.Win64 Nuget package and used the following code in a singleton:

public class PechkinPDFConvertor : IPDFConvertor
{
    IConverter converter =
               new ThreadSafeConverter(
                  new RemotingToolset<PdfToolset>(
                       new Win64EmbeddedDeployment(
                           new TempFolderDeployment())));

    public byte[] Convert(string html)
    {
        //            return PechkinSync.Convert(new GlobalConfig(), html);
        return converter.Convert(new HtmlToPdfDocument(html));
    }
}

The web application then has to be run in x64 otherwise you will get an error about trying to load an x64 assembly in an x86 environment. Presumably you have to choose x64 or x86 at design time and use the corresponding nuget package, it would be nicer to choose this in the web.config.

EDIT: The above code failed on one server with the exact same message as yours - it was due to having not installed VC++ 2013. So the new code is running x86 as follows

try
{
    string path = Path.Combine(Path.GetTempPath(), "MyApp_PDF_32");
    Converter = new ThreadSafeConverter(
                  new RemotingToolset<PdfToolset>(
                       new Win32EmbeddedDeployment(
                           new StaticDeployment(path))));
}
catch (Exception e)
{
    if (e.Message.StartsWith("Unable to load DLL 'wkhtmltox.dll'"))
    {
        throw new InvalidOperationException(
        "Ensure the prerequisite C++ 2013 Redistributable is installed", e);
    }
    else
        throw;
}

In my case, I am deploying on a 64-bit VPS then I got this error. I have solved the problem by installing the wkhtmltopdf that I downloaded from http://wkhtmltopdf.org/downloads.html. I chose the 32-bit installer.

In my case, I have solved the problem by installing the Wkhtmltox for win32 at https://www.nuget.org/packages/TuesPechkin.Wkhtmltox.Win32/

If you do not want run the installer for wkhtmltox just to get the dll, you can do the following:

As @Timothy suggests, if you use the embedded version of wkhtmltox.dll from TuesPechkin, it will unzip it and place it in a temp directory. I copied this dll and referenced it with the StaticDeployment option without any issues.

To find the exact location, I just used Process Monitor (procmon.exe). For me it was C:\Windows\Temp\-169958574\8\0.12.2.1\wkhtmltox.dll

This error: Unable to load DLL 'wkhtmltox.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E) is returned in two situations:

1- Deploy dependency not installed:

For solve this, you can install nuget package "TuesPechkin.Wkhtmltox.Win64" and use this code (for WebApplications running in IIS):

IConverter converter =
    new ThreadSafeConverter(
        new RemotingToolset<PdfToolset>(
            new Win64EmbeddedDeployment(
                new TempFolderDeployment())));

// Keep the converter somewhere static, or as a singleton instance!
// Do NOT run the above code more than once in the application lifecycle!

byte[] result = converter.Convert(document);

In runtime this code will copy the dependency "wkhtmltox.dll" in a temporary directory like: "C:\Windows\Temp\1402166677\8\0.12.2.1". It's possible to get the destination of file using:

var deployment = new Win64EmbeddedDeployment(new TempFolderDeployment());
Console.WriteLine(deployment.Path);

2- Microsoft Visual C++ 2013 Redistributable not installed:

As described here: https://github.com/tuespetre/TuesPechkin/issues/65#issuecomment-71266114, the Visual C++ 2013 Runtime is required.

The solution from README is:

You must have Visual C++ 2013 runtime installed to use these packages. Otherwise, you will need to download the MingW build of wkhtmltopdf and its dependencies from their website and use that with the library. https://github.com/tuespetre/TuesPechkin#wkhtmltoxdll

or, you can install the Microsoft Visual C++ 2013 Redistributable:

choco install msvisualcplusplus2013-redist

Here is AnyCpu version, also support iis-base or winform application

using TuesPechkin.Wkhtmltox.AnyCPU;
...
var converter = PDFHelper.Factory.GetConverter();
var result = converter.Convert(This.Document);

Reference : https://github.com/tloy1966/TuesPechkin

Installing the Visual C++ Redistributable for Visual Studio 2013 resolved the error for me.

https://www.microsoft.com/en-us/download/details.aspx?id=40784