dll could not be initialized in module.js about cap HOT 10 CLOSED

To be more explicit with the error message, it is:
Uncaught error: A dynamic link library (DLL) initialization routine failed module.js :640

from cap.

Sorry, didn't mean to close this!!

from cap.

Sorry, I don't really have any experience with compiling addons for use with nw.js.

from cap.

Thanks for the quick reply - I will see if I can initialize cap under Windows just from node.js. I didn't think that nw.js would be the problem. I used nw.js with cap on the Mac and it worked fine.

from cap.

IIRC nw.js has its own special method of compiling addons (using nw-gyp) in order to properly integrate with its bundled chrome/chromium (V8 really).

Using cap directly with node on Windows should definitely work fine though.

from cap.

This all makes sense. I will try node and cap tomorrow. Thanks for the help!

from cap.

Using cap directly with node on Windows does indeed take me beyond the 'require' statement where my error occurred. I do need the nw capabilities, and have posted the following on the nw.js site:

I have been successfully using the module cap in an osx node/nw program to receive and transmit Ethernet packets. I am porting the program to Windows, and have an issue with the cap module.

I am using node.js v6.11.0 and nw.js v0.23.5. Windows 8.1.

A problem arises at the statement:
var Cap = require('cap').Cap;
Where I get the following output:

module.js:640 Uncaught Error: A dynamic link library (DLL) initialization routine failed.
\?\D:\AVBFlexSDK\node_modules\cap\build\Release\cap.node
at Object.Module._extensions..node (module.js:640:18)
at Module.load (module.js:527:32)
at tryModuleLoad (module.js:490:12)
at Function.Module._load (module.js:482:3)
at Module.require (module.js:537:17)
at require (internal/module.js:11:18)
at Object. (D:\AVBFlexSDK\node_modules\cap\lib\Cap.js:3:13)
at Module._compile (module.js:593:30)
at Object.Module._extensions..js (module.js:610:10)
at Module.load (module.js:527:32)

The statement is not a problem within a node.js program, and the cap module installs fine (Python 2.7 and Visual C++ installed). I have done the following to resolve the issue:

1. Given that I am using an LTS release, I first replaced the win_delay_load_hook.cc file with the one given on the nw.js documentation page. The require statement resulted in the same error message.
2. I then followed the procedure for the non-LTS releases:
   set PYTHON=C:\Python27\python.exe
   set npm_config_target=0.23.5
   set npm_config_arch=x64
   set npm_config_runtime=node-webkit
   set npm_config_build_from_source=true
   set npm_config_node_gyp=C:\Users<my info>\AppData\Roaming\npm\node_modules
   Still the same result - an error at the require statement.

Possibly someone in this group has had a similar experience and resolved it - which would be wonderful!

from cap.

@RichardFoss Its just about "prebuild" the target package "cap" (https://www.npmjs.com/package/prebuild).
I use Electron, so "prebuild" provide a way to compile the package to the target OS/arch. You need to find some similar tool on NW.JS.

So, that issue has nothing to do with "cap", but the way packages are compiled to the target OS.

from cap.

Thanks robsontenorio! I managed to resolve my issue and have meant to post my solution to the group in case anyone else has a similar dilemma. The steps I took are given below. Step d is the "similar tool" that you are referring to.

For native node modules (for example cap), you will:
a. First need to install all the required tools and configurations. To do this, you could use Microsoft's windows-build-tools using:
npm install --global --production windows-build-tools
from an elevated PowerShell or CMD.exe (run as Administrator). This will install Visual Studio and also Python 2.7.
b. On Windows, you need to replace the file
\node_modules\node-gyp\src\win_delay_load_hook.cc
with the one at
https://github.com/nwjs/nw.js/blob/nw18/tools/win_delay_load_hook.cc
before installing modules with node-gyp or npm.
c. Run the following command in your terminal to install nw-gyp globally:
npm install -g nw-gyp
d. If for example, cap is the native module, then in the node_modules/cap folder, run
nw-gyp rebuild --target=0.23.5(or whatever your version of nw.js is)
e. In your native module documentation, look for any programming guidelines that are unique to Windows. For example in cap:
setMinBytes(< integer >nBytes) - (void) - (Windows ONLY) This sets the minimum number of packet bytes that must be captured before the full packet data is made available.

from cap.

Thanks for the information @robsontenorio and @RichardFoss

from cap.