visa32test

samo4 · Apr 24, 2015 · efe5212 · efe5212
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diff --git a/index.html b/index.html
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+<!DOCTYPE html>
+<html>
+ <head>
+  <meta charset="utf-8" />
+  <title>NODE.JS INTERACTIVE IO</title>
+ </head>
+ <body>
+            <h1>NODE.JS INTERACTIVE IO</h1>
+
+            <input type="text" id="visaaddress" value="GPIB0::22::INSTR" />
+            <input type="text" id="command" value="*IDN?" />
+            <button>SEND</button>
+            <h3>Receive Message</h3>
+            <script src="/socket.io/socket.io.js"></script>
+            <script src="http://code.jquery.com/jquery-1.11.1.js"></script>
+            <script>
+                var socket = io();
+                $('button').click(function(){
+                	var addr = $("#visaaddress").val();
+                	var cmd = $("#command").val();
+                	var msg = {
+					    addr : addr,  
+					    cmd : cmd  
+                		}
+                    socket.emit('sendmsg',msg);
+                });
+                socket.on('recvmsg',function(data){
+                    $('h3').text(data);
+                });
+
+            </script>
+ </body>
+</html>
diff --git a/index.js b/index.js
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+/************************************************************
+
+ NODE.JS INTERACTIVE IO
+ 
+This is WEB interface for visa32test.js.
+
+Author : 7M4MON
+Date : 2015/04/24
+Licence : MIT
+
+************************************************************/
+
+
+var app = require('express')();
+var http = require('http').Server(app);
+var io = require('socket.io')(http);
+
+var visa32test = require('./visa32test.js');
+
+//visa32test.Visa32TestQuery('GPIB0::22::INSTR','*IDN?');
+
+app.get('/',function(req,res){
+    res.sendfile('index.html');
+});
+var rcvMsg;
+io.on('connection',function(socket){
+    socket.on('sendmsg',function(msg){
+        rcvMsg = visa32test.Visa32TestQuery(msg.addr,msg.cmd);
+        io.emit('recvmsg', rcvMsg);
+    });
+});
+
+http.listen(3000,function(){
+    console.log('listen 3000 port');
+});
diff --git a/visa32test.js b/visa32test.js
@@ -0,0 +1,110 @@
+/************************************************************
+
+ VISA32TEST.JS
+ 
+visa32test.js is a prototype for using VISA ( Virtual Instrument Software Architechture) 
+library in node.js.
+
+This is a wrapper for visa32.dll ( in your system32 folder).
+
+I tested this code on Windows 7 (32bit), Keysight IO Library (17.1), node.js(0.10.26) .
+
+Please test on your insturment (e.g. GPIB, RS232, LAN etc...) and fork me, and
+develop complete VISA module. (like pyVISA)
+
+to use...
+
+> npm install ffi
+> npm install ref
+> npm install ref-array
+> node visa32test.js
+
+Author : 7M4MON
+Date : 2015/04/24
+Licence : MIT
+
+************************************************************/
+
+
+var ref = require('ref');
+var ffi = require('ffi');
+var ArrayType = require('ref-array')
+
+// typedef
+var ViError = ref.types.int;
+var ViSession = ref.types.int;
+
+//var ViRsrc = ref.types.CString;
+//var ViAccessMode = ref.types.int;
+//var ViUint32 = ref.types.int;
+
+// for viScanf
+var byte = ref.types.byte;
+var ByteArray = ArrayType(byte);
+
+// not used
+//var StrArray = ArrayType(stringAry);
+//var StrArrayPtr = ref.refType(StrArray);
+//var replyString = ref.types.CString;
+//var replyStringPtr = ref.refType(replyString);
+
+var visa32 = ffi.Library('visa32', {
+	'viOpenDefaultRM': [ViError, ['string'] ] ,							//viOpenDefaultRM(sesn)
+	'viOpen' : [ViError, ['int', 'string', 'int', 'int', 'string'] ],	//viOpen(sesn, rsrcName, accessMode, timeout, vi) 
+    'viPrintf' : ['int',['int', 'string']],
+    'viScanf' : ['int',['int', 'string', ByteArray]],
+	'viClose' : ['int', [ViSession] ]
+});
+
+
+exports.Visa32TestQuery = function (visaAddress, queryString){
+	return Visa32TestQuery(visaAddress, queryString);
+};
+
+function Visa32TestQuery(visaAddress, queryString){
+
+	var resourceManager = '0';
+	var viError = 0;
+	var session = 0;
+	var replyString = '';
+
+	// intialize Buffer
+	var replyBuff = new ByteArray(256);
+	var counter;
+	for  (counter = 0 ; counter < 256 ; counter++){
+		replyBuff [counter] = 0 ;
+	}
+
+
+	viError = visa32.viOpenDefaultRM('0');
+
+	//console.log(viError);
+
+	//var visaAddress;
+	//visaAddress = 'GPIB0::22::INSTR'
+
+	console.log("ADDR : " + visaAddress);
+	viError = visa32.viOpen('256', visaAddress, '0', '2000', '256');
+
+	//var queryString;
+	//queryString = "*IDN?";
+	viError = visa32.viPrintf('1', queryString + "\n");
+
+	console.log("SEND : " + queryString);
+
+	viError = visa32.viScanf('1', "%s", replyBuff);
+	visa32.viClose(resourceManager);
+
+	// make reply string
+	counter = 0;
+	while(replyBuff[counter] != 0){
+		replyString +=  String.fromCharCode( replyBuff [counter] );
+		counter ++;
+	}
+
+	console.log("RECV : " + replyString);
+	return replyString;
+}
+
+// if you use as module, please comment out below:
+//Visa32TestQuery('GPIB0::22::INSTR','*IDN?');