i tried to get exe file callback result when i doing shell execute like this:
var oShell = new ActiveXObject("WScript.Shell");
var args = folderName + "\\dir\\scan.exe scan " + params.join(" ");
var ret = oShell.Run(args ,0 ,true);
but ret gaves me 0 for fail and 1 for success.
when i run the file in the cmd like this:
scan.exe arg1 arg2 arg3
this is return the correct result that i wanted : "test/test" and not 1...
what can i do?
tnx a lot
I know I might be a bit late to answer this question but I hope it can still help someone.
The way I achieved it was with the oShell.Exec() function and not with the oShell.Run().
oShell.Exec() returns an object with a property called StdOut which acts like a text file, so you can perform ReadLine(), ReadAll(), etc.
The problem is that it does not wait for the command to end, so when you run your code, it is very likely that your StdOut object will be undefined. You have to add that waiting option on the command itself.
var wshShell = new ActiveXObject("WScript.Shell");
try {
// Excecute the 'cd' command.
wshShell.CurrentDirectory = "C:\\Users";
var execOut = wshShell.Exec('cmd /C start /wait /b cd');
}
catch (e) {
console.log(e);
}
// Get command execution output.
var cmdStdOut = execOut.StdOut;
var line = cmdStdOut.ReadLine();
console.log(line);
The code above will execute a cd command on the directory C:\Users and store the output on the line variable.
I hope this answers the question.
Using a shell to receive output from BATCH file:
script.js
var pathToFile = "your_path_here"
var shell= new ActiveXObject("WScript.shell");
var output = shell.Exec(pathToFile + 'example.bat');
var response = output.StdOut.ReadLine();
console.log(response)
example.bat
#ECHO OFF
echo Hello From Batch World
exit 0
Related
If I execute a certain shell command in node js, the output is on the console. Is there a way I can save it in a variable so it can be POST to Sqlite database.
const shell = require('shelljs');
shell.exec('arp -a');
In this scenario, I want to store the IP address of a specific MAC/Physical address into the database. How can this be done?
Any help would be much appreciated. Thank you
You need to get the output of the command you're passing to exec. To do that, just call stdout, like this:
const shell = require('shelljs');
const stdout = shell.exec('arp -a').stdout;
Then just parse that output to get your ipaddress:
const entries = stdout.split('\r\n');
// entries sample
[ '',
'Interface: 10.17.60.53 --- 0xd',
' Internet Address Physical Address Type',
' 10.11.10.52 6c-4b-90-1d-97-b8 dynamic ',
' 10.10.11.254 xx-yy-53-2e-98-44 dynamic ']
Then you can filter your wanted address with some more manipulation.
EDIT:
To get the ip address, you could do:
let ipAddr = null;
for (let i = 0; i < entries.length; i++) {
if (entries[i].indexOf('6c-4b-90-1d-97-b8') > -1) {
ipAddr = entries[i].match(/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/)[0];
break;
}
}
console.log(ipAddr); // '10.11.10.52'
I'm merely copy pasting from the docs. You should research more.
You need to add a listener to stdout
var child = exec('arp -a', {async:true});
child.stdout.on('data', function(data) {
/* ... do something with data ... */
});
Or adding the callback directly when calling exec
exec('some_long_running_process', function(code, stdout, stderr) {
console.log('Exit code:', code);
console.log('Program output:', stdout);
console.log('Program stderr:', stderr);
});
You can access the result of the command run using shell.exec with the .output property. Try the code below.
var shell = require('shelljs');
var result = shell.exec('arp -a').output;
If you don't want the result in the console, you can specify the silent option.
var result = shell.exec('arp -a', {silent: true}).output;
Now, you can use regular expressions to extract ip and mac address from the result.
I am getting the result of the command like below:
? (xxx.xxx.xxx.xxx) at xx:xx:xx:xx:xx:xx [ether] on eth0
? (yyy.yyy.yyy.yyy) at yy:yy:yy:yy:yy:yy [ether] on eth0
You can use the following code to extract ip and mac.
var res = result.split("\n").map(function(item){
return item.match(/\((\d+\.\d+\.\d+\.\d+)\) at (..:..:..:..:..:..)/);
});
console.log(res[0][1]); //IP of first interface
console.log(res[0][2]); //MAC of first interface
console.log(res[1][1]); //IP of second interface
console.log(res[1][2]); //MAC of second interface
NOTE
I was not able to find the .output property in the documentation but trying the shell.exec function in the node console revealed it.
The .stdout property or the exec function mentioned in other answers doesn't work for me. They are giving undefined errors.
I run a test.js with:
var power_meter = require('./power-meter');
var pm = new power_meter.PowerMeter();
function a() {
var power_instant = 123;
pm.broadcast(power_instant);
setTimeout(a, 249);
}
a();
The Output is
123
123
...
Now i want to import a value from a python script with python-shell with:
var PythonShell = require('python-shell');
var pyshell = new PythonShell('7powerx.py');
var power_meter = require('./power-meter');
var pm = new power_meter.PowerMeter();
pyshell.on('message', function (message) {
console.log(message);
var power_instant = message;
pm.broadcast (power_instant);
});
// end the input stream and allow the process to exit
// end the input stream and allow the process to exit
pyshell.end(function (err) {
if (err) throw err;
console.log('finished');
});
I have tried to set the "setTimeout(a, 249);"
a();
in any place but without any success.
The script started and do an output after circa 5 minutes, but then stops again and after a time it works again for a moment.
I need to place the "setTimeout" but no idea where.
Any idea?
Update.
I have in my pythonScript a time function, when i set this to 0.0 it works, but my Raspberry PI collapse. So is there a snych/timing problem.
The problem is solved:
For a looping process i need to start with:
var pyshell = new PythonShell('test.py',{scriptPath:"./", pythonOptions: ['-u']});
I hope this helps other, too!
When working in Python I always have this simple utility function which returns the file name and line number from where the function is called:
from inspect import getframeinfo, stack
def d():
""" d stands for Debug. It returns the file name and line number from where this function is called."""
caller = getframeinfo(stack()[1][0])
return "%s:%d -" % (caller.filename, caller.lineno)
So in my code I simply put a couple debug lines like this to see how far we get before some error occurs:
print d()
# Some buggy code here
print d()
# More buggy code here
print d(), 'here is the result of some var: ', someVar
This works really well for me because it really helps debugging quickly.
I'm now looking for the equivalent in a node backend script. I was searching around but I can't find anything useful (maybe I'm looking for the wrong words?).
Does anybody know how I can create a Javascript/nodejs function which outputs the file name and line number from where the function is called? All tips are welcome!
You can create an Error to get where the Error is, and its stack trace. Then you can put that into a function, to get the line where it is.
function thisLine() {
const e = new Error();
const regex = /\((.*):(\d+):(\d+)\)$/
const match = regex.exec(e.stack.split("\n")[2]);
return {
filepath: match[1],
line: match[2],
column: match[3]
};
}
console.log(thisLine());
This works for me in Google Chrome.
And also in node.
Note to #j08691's comment:
Both this and this seem to be using lineNumber, which is not present (as far as I could test) in NodeJS.
Printing line number with custom string
const moment = require('moment');
const log = console.log;
const path = require('path');
function getTime(time) { return moment().format('YYYY-MM-DD HH:mm:ss') };
function line(num = 2) {
const e = new Error();
const regex = /\((.*):(\d+):(\d+)\)$/
const match = regex.exec(e.stack.split("\n")[num]);
const filepath = match[1];
const fileName = path.basename(filepath);
const line = match[2];
const column = match[3];
return {
filepath,
fileName,
line,
column,
str: `${getTime()} - ${fileName}:${line}:${column}`
};
}
log(line().str, "mylog1");
log(line().str, "mylog2");
log(line().str, "mylog3");
OUTPUT
2021-11-22 13:07:15 - test.js:44:5 mylog1
2021-11-22 13:07:15 - test.js:45:5 mylog2
2021-11-22 13:07:15 - test.js:46:5 mylog3
You can use this gulp plugin gulp-log-line . It Logs file and line number without the extra cost of reading the stack.
you just have to install gulp and gulp-log-line using the
npm install gulp --save and npm install gulp-log-line command. after that you need to create and write the below code in gulpfile.js and run
gulp log-line to create a duplicate file in the build folder :-
var gulp = require('gulp');
var logLine = require('gulp-log-line');
gulp.task('line-log', function() {
return gulp.src("file.js", {buffer : true})
//Write here the loggers you use.
.pipe(logLine(['console.log', 'winston.info']))
.pipe(gulp.dest('./build'))
})
gulp.task('default', ['line-log'])
Example
file.js :-
console.log('First log')
var someVariable
console.log('Second log')
Becomes
console.log('file.js:1', 'First log')
var someVariable
console.log('file.js:3', 'Second log')
The only way I've found to get anything relating to line numbers is to trap the window.onerror function, and when there's an error that will get passed the error message, the file URL and the line number:
window.onerror = function(msg, url, line) {
alert(msg + "\n" + url + ":" + line);
};
This works for me on Chrome - I don't know about other browsers.
EDIT when this answer was given in Feb' 15 there was no mention of NodeJS in the question. That was only added in November '17.
I have a batch file that will launch a .js file which, via WinSCP, checks if a file exists and returns to the batch file if it does or not.
The problem IS: It always returns not found, and I cannot figure out why. I am unsure how to use a wildcard in this scenario.
The batch file looks like this:
cscript /nologo file.js
if errorlevel 1 goto notfound
exit
:notfound
(another script to copy a file over)
Only one file can exist on the server at once. So every ten min, this batch file will run, check if there is a file, if not, copy one over.
The file.js:
// Configuration
// Remote file search for
var FILEPATH = "../filepath/TSS*";
// Session to connect to
var SESSION = "mysession#someplace.come";
// Path to winscp.com
var WINSCP = "c:\\program files (x86)\\winscp\\winscp.com";
var filesys = WScript.CreateObject("Scripting.FileSystemObject");
var shell = WScript.CreateObject("WScript.Shell");
var logfilepath = filesys.GetSpecialFolder(2) + "\\" + filesys.GetTempName() + ".xml";
var p = FILEPATH.lastIndexOf('/');
var path = FILEPATH.substring(0, p);
var filename = FILEPATH.substring(p + 1);
var exec;
// run winscp to check for file existence
exec = shell.Exec("\"" + WINSCP + "\" /log=\"" + logfilepath + "\"");
exec.StdIn.Write(
"option batch abort\n" +
"open \"" + SESSION + "\"\n" +
"ls \"" + path + "\"\n" +
"exit\n");
// wait until the script finishes
while (exec.Status == 0)
{
WScript.Sleep(100);
WScript.Echo(exec.StdOut.ReadAll());
}
if (exec.ExitCode != 0)
{
WScript.Echo("Error checking for file existence");
WScript.Quit(1);
}
// look for log file
var logfile = filesys.GetFile(logfilepath);
if (logfile == null)
{
WScript.Echo("Cannot find log file");
WScript.Quit(1);
}
// parse XML log file
var doc = new ActiveXObject("MSXML2.DOMDocument");
doc.async = false;
doc.load(logfilepath);
doc.setProperty("SelectionNamespaces",
"xmlns:w='http://winscp.net/schema/session/1.0'");
var nodes = doc.selectNodes("//w:file/w:filename[#value='" + filename + "']");
if (nodes.length > 0)
{
WScript.Echo("File found");
// signalize file existence to calling process;
// you can also continue with processing (e.g. downloading the file)
// directly from the script here
WScript.Quit(0);
}
else
{
WScript.Echo("File not found");
WScript.Quit(1);
}
On line 4 it says:
var FILEPATH = "../filepath/TSS*";
That star is what is giving me issues, i think. I need to look for a file which STARTS WITH TSS, but will have a time stamp tacked on the end. So i need to just use a wildcard after TSS.
So what i need help with is: Making this process return true if any file exists with TSS*
Any help would be much appreciated.
EDIT:
var nodes = doc.selectNodes("//w:file/w:filename[starts-with(#value, 'TSS')]");
This code seems to not work. If this code worked, it seems like it would solve all my problems.
You need to correct xpath expression in var nodes... line.
Try something like this:
doc.setProperty("SelectionLanguage", "XPath"); //added in edit
var nodes = doc.selectNodes("//w:file/w:filename[starts-with(#value, '" + filename + "')]");
and delete asterisk from FILEPATH.
Note: first line is required in order to use XPath as the query language, not default (and old) XSLPattern which doesn't support methods such as starts-with or contains.
SelectionLanguage Property (MDSN).
You can use the stat command. You can even inline the WinSCP script into the batch file:
#echo off
set REMOTE_PATH=/home/user/test.txt
winscp.com /command ^
"option batch abort" ^
"open mysession" ^
"stat %REMOTE_PATH%" ^
"exit"
if errorlevel 1 goto error
echo File %REMOTE_PATH% exists
rem Do something
exit 0
:error
echo Error or file %REMOTE_PATH% not exists
exit 1
An alternative is using the Session.FileExists from WinSCP .NET assembly.
For further details, see the WinSCP article Checking file existence.
Here is the code I have so far...
// Run the external encryption process
var fileExe = Components.classes["#mozilla.org/file/local;1"]
.createInstance(Components.interfaces.nsILocalFile);
fileExe.initWithPath("~/tmp/Encrypt.jar");
var process = Components.classes["#mozilla.org/process/util;1"]
.createInstance(Components.interfaces.nsIProcess);
process.init(fileExe);
var args = ["java -jar Encrypt.jar -e toEncrypt"];
process.run(true, args, args.length);
document.getElementById('hello-world-status-bar-icon').label = "DONE";
This currently does not work. Any suggestions??
EDIT
I've also tried..
// Run the external encryption process
var fileExe = Components.classes["#mozilla.org/file/local;1"]
.createInstance(Components.interfaces.nsILocalFile);
fileExe.initWithPath("java");
var process = Components.classes["#mozilla.org/process/util;1"]
.createInstance(Components.interfaces.nsIProcess);
process.init(fileExe);
var args = new Array();
args[0] = " -jar";
args[1] = "~/tmp/Encrypt.jar";
args[2] = "-e";
args[3] = "toEncrypt";
process.run(true, args, args.length);
document.getElementById('hello-world-status-bar-icon').label = "DONE";
Thanks,
Pat
I think you need to init the process with a reference to the local file that is the "java" executable. That's what needs to be executed at the system level. The arguments need to be passed as an array of individual strings, not a single string.