winax-dynamic-linking

Name

Windows C++ Node.JS addon, that implements COM IDispatch object wrapper, analog ActiveXObject on cscript.exe

Features

• Using ITypeInfo for conflict resolution between property and method (for example !rs.EOF not working without type information, becose need define EOF as an object)

• Using optional parameters on constructor call

var con = new ActiveXObject("ADODB.Connection", {
    activate: false, // Allow activate existance object instance, false by default
    async: true, // Allow asynchronius calls, true by default (for future usage)
    type: true	// Allow using type information, true by default
});

• Create COM object from JS object and may be send as argument (for example send to Excel procedure)

var com_obj = new ActiveXObject({
    text: test_value,
    obj: { params: test_value },
    arr: [ test_value, test_value, test_value ],
    func: function(v) { return v*2; }
});

• Additional dignostic propeties:
  • __id - dispatch identity, for exmplae: [e-mail]
  • __value - value of dispatch object, equiles valueOf()
  • __type - list member names with their properties

Usage example

Install package throw NPM (see below Building for details)

npm install winax

Create ADO Connection throw global function

require('winax');
var con = new ActiveXObject('ADODB.Connection');

Or using Object prototype

var winax = require('winax');
var con = new winax.Object('ADODB.Connection');

Open connection and create simple table

con.Open('Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\tmp;Extended Properties="DBASE IV;"', '', '');
con.Execute("Create Table persons.dbf (Name char(50), City char(50), Phone char(20), Zip decimal(5))");
con.Execute("Insert into persons.dbf Values('John', 'London','123-45-67','14589')");
con.Execute("Insert into persons.dbf Values('Andrew', 'Paris','333-44-55','38215')");
con.Execute("Insert into persons.dbf Values('Romeo', 'Rom','222-33-44','54323')");

Select query and return RecordSet object

var rs = con.Execute("Select * from persons.dbf"); 
var reccnt = rs.RecordCount;

Inspect RecordSet fields

var fields = rs.Fields;
var fldcnt = fields.Count;

Process records

rs.MoveFirst();
while (!rs.EOF) {
    var name = fields("Name").value;
    var town = fields("City").value;
    var phone = fields("Phone").value;
    var zip = fields("Zip").value;   
    console.log("> Person: " + name + " from " + town + " phone: " + phone + " zip: " + zip);    
    rs.MoveNext();
}

Or using fields by index

rs.MoveFirst();
while (rs.EOF != false) {
    var name = fields[0].value;
    var town = fields[1].value;
    var phone = fields[2].value;
    var zip = fields[3].value;   
    console.log("> Person: " + name + " from " + town + " phone: " + phone + " zip: " + zip);    
    rs.MoveNext();
}

Release COM objects (but other temporary objects may be keep references too)

winax.release(con, rs, fields)

Tutorial and Examples

• examples/ado.js

Building

This project uses Visual C++ 2013 (or later versions then support C++11 standard). Bulding also requires node-gyp and python 2.6 (or later) to be installed. You can do this with npm:

npm install -g node-gyp

To obtain and build use console commands:

git clone git://github.com/durs/node-axtivex.git
cd node-activex
node-gyp configure
node-gyp build

For Electron users, need rebuild with a different V8 version:

npm rebuild winax --runtime=electron --target=1.4.3 --disturl=https://atom.io/download/atom-shell --build-from-source

See also Electron Documentation: Using Native Node Modules

Tests

mocha is required to run unit tests.

npm install -g mocha
mocha test

Contributors

• durs