Read Data From An External Device Using MSComm Control ?

Nov 30, 2010

I am trying to read data from an external device using MSComm control but the problem is I am getting wrong data. I am recieving 1 byte data but the first three bits are wrong so anything greater than 31 sent from the external devices is recieved wrongly. eg. if I am sending 63(111111) from the device then the input from MSComm control gives me 159(10011111).Due to this reason I tried SerialPort from .Net framework and was surprised to see that it is working properly.


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I have developed a simple software using, now i want to receive some data from an external device,How to read a hardware transmitted data using, where hardware is attached to a USB port?"

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And when it has been added, is it like in VB6 - just clicking twice on the control opens a private sub OnComEvent?

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Option Explicit
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Private Sub cmdOpen_Click()


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I am developing an application which is pretty much a replacement of a hyperterminal.  I am trying to send commands to the serial port using MSComm in VB6.0 When I type in on the hyperterminal h003128 I get a response OK.  Or when I type in i003 it displays back some values.

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Dec 18, 2010

The drive is connected via USB and the problem I'm having is that, periodically, while my code is executing, the usb drive seems to disconnect and reconnect. (Nothing to do with the program, but the drive itself).I want to find a way to prevent these temporary drive reconnects from interrupting my code. IE, i want to insure that whatever read or write that is requested is actually executed even in the case of a temporary drive interruption.

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im from iran.your site very fine. i have a question . in my country have vary device that send it information by phone line(example:fax,POS...) if me connect it to my computer modem and my computer modem connect to phone can i read information recived and sended.

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How can I read SMS from mobile with my .net application? i have a Nokia 5310 mobile phone. Can you tell me from where i can download Nokia SDK or source code or Nokia API etc?

I want to make a custom application which reads SMS and at the same time sends a response to the sender's mobile number.

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May 13, 2011

My current program can read in a continuous stream of data when initialized and I can send a command to retrieve the devices stored data, I also have within the same program code that will read an XML file and populate from controls.

I have two separate idea's right now that I'm trying to merge into one

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I am trying to write and read bytes from usb device.I have an array dout(8) of boolean say f,t,t,f,t,t,f,t representing switch states.I need to convert that to a variable DataOut as byte. 01101101 Later I read the usb device.This gives me a variable Data as byte 10110100 I need to convert that to an array DIn(10) of boolean t,f,t,t,f,t,f,f All my code attempts have failed.

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Sep 9, 2009

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I'm trying to read information from a device through COM Port.. Sometimes I receive information like:


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Mar 22, 2010

I'm having difficulty figuring out how to run different programs with my VB program. Using Excel and other MS office programs is easy enough since I just add in the relevant COMs, but I can't for the life of me find out how to run other programs. I promise I spent many hours searching before bothering you kind folks here! I'd think this is a common issue so maybe I haven't been searching for the right to write code that will control and read data from applications.I know you can do "Process.Start" to open any application, and it looks like there are ways to determine the controls available on an open application, but I can't figure out how to do it. Is this possible? Or do I have to import a .dll file for every program I want to control? Or are both possible?

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I like to read text from another application's buttons, labels and textboxes with the help of "SendMessage". I've tried so many different code examples, but nothing worked. Maybe somebody of you has a small VB.Net-Example on your harddrive and explain it a bit to me.

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I have a chart control (stacked chart to be more precise) and a datatable that contains 3 columns. I want to bind them into a stacked bar chart. below is what the datatable looks like:


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I have a situation where I have a program that uses two connection strings. This program will be used on multiple web servers on multiple domains and the only difference for any of them is the two connection strings.What would be the best solution to read in these connection strings from a file separate from my actual .vb code?

Ideally I want to be able to drop the .vb and the connection string file into its own folder on any number of websites and not update anything else (for example add any connections to the web.config or anything) than the external file containing the connection strings, I assume something like xml would suffice?

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I am trying to extend some features of a external programm that is not able to use plugins or something. So I have to write my own app that reads the text from a textbox from this external application and trigger some own actions.

By using the FindWindow API in user32.dll I allready catched up the handle for the external application. But now I am kind of stuck. By using Spy++ from the Visual Studio Tools I got the information that the class name from the control I would like to read from is "", but there are several of them. Additionally every time the external app starts it creates a new control id for the textbox I want to read.

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with the hwnd = FindWindow(Nothing, "MsgBox Title")put in a Timer_Elapsed event i can get the Hwnd of a MessageBox launched from an external application. starting from the Hwnd there is way to get the text ot this message box?

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I'm currently working on a project where I am transmitting data from a comm device via the serial port and resorting the raw data (in binary) to its respective ascii values. The problem I'm facing is determining the most efficient method to accomplish my goal. Essentially, I have 68 bytes coming in, the first and second bytes represent the page and packet number and the data itself ranges from 3 to 64, the remaining for my checksum.

What I am needing to do is, grab 50 consecutive bytes per variable in my array, and that is where I'm confused. I have easily pulled my 3-64 bytes and stored that data to a string. I just don't know the most efficient method to accomplish my goal. Should I write directly to file all my data, as there are like 8 pages, of 128 packet data. [Code] I can capture the the first 50 by using a for-loop easily, but what would be the preferred method to track what data chunk I've taken? The more I think about it, I think I may just want to write to file, all my data, and then just take them back to back in 50 byte chunks. Is that the most efficient method?

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I have a modbus TCP device that I have managed to connected to through my VB source code.

I want to poll (continueously read) data from certain registers of the device, and store the polled data in a file (text,csv, excel).

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Apr 25, 2012

i wrote some code to control an ip device, i made in windows forms application , silverlight and, they all work on the local network , but won't work from internet web server, i have the router forwarding to local device ip and port,

i get this error:
A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 226.45.306.158:4999

here's the code used

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How would i create a remote control device so i could access any pc with this software and view there screens, share files, etc.

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I want to select either "Wave" or "What U Hear" or "Microphone" or "Analog Mix" (LineIn) in the Windows Recording Control applet, i.e. as if I clicked the applicable "Select" checkbox.

I got this VB6 code on the Net (not sure where) and tried to convert it to VB2008. It is very near to correct I think, but the last part does not work.

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Dec 2, 2009

I am using Visual Basic 2008 Express Edition. Some of the programs I am writing make extensive use of External files (saved games,  data, item lists, etc.) I could use an easy way to get these files to ride allong during deployment (cd mostly). adding them to the resources works for some static pictures, but custom structures into lists of info to read and write from are beond that features abilities, same with the settings feature. I have found in other help referance to "MageUI.exe" so is downloading a .net SDK my solution or is there a better trick I can use?

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Mar 30, 2010

We are trying to modify a program to control a usb relay device. Essentially what the program originally does is give you a series of check boxes that you check to make the relay fire. We tried to modify the code so that the box is checked after 5 seconds using a counter and an if statement. It works, but only partially, what happens is the check box shows a check, but the even that is normally triggered does not happen. [code]

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Apr 22, 2010

Example On my pc I have one application and on a tablet, running on 7, I have the other app. I want to control buttons in the app on my pc from the tablet device app. How to do this?


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A Problem in accessing a device from VB Windows cannot load the device driver for this hardware because there is a duplicate device already running in the system. (Code 42) This error is because i am using 2 devices of the same company which has the mass usb storage on it and when i install one of the device the other hides. So one is detected the Other is not. It also give a error called designed dragnonacally something...

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I am using VB 2005. I am trying to open an external program, make it invisible, and then control it. It is fine if the external program shows up in the Windows Task Manager, but I don't want anything showing up in the Windows taskbar. I already know how to open the program I want to use. For that I am using:

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I have a usb instrument and a driver who's printed output dumps a data string to the computer I need to be able to read this string into vba The driver manual provides the content of the string but no info on how to access the data.

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I've created a custom USB device using a PIC18F4550 and I'm having trouble with reading information from the device. The device sends reports without a request from the application as 64 bytes. I'm relatively new to VB and this is my first foray into USB as well... It's not going good. I've set the Vendor ID to Hex 1234 and the Hardware ID to Hex 0001. I've used different libraries and the timer to check for incoming reports, but I can't seem to figure it out. I've waded through pages of USB Complete and all kinds of code for mice and barcode scanners, but nothing so far that will do anything for my device.. how I can register the device and get the raw report from the device and display it in a text box

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i have an external program, i got his and w.e else is needed.... i want to know how do i tick a checkbox from my program. to this external software. to tick this checkbox and then the checkbox will do what it supposed to do, and not just change the gui to ticked without doing a thing,

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I have a sim card reader, that is a usb-to serial device. It has a sim card inserted. what i need to do is access that sim card to get the data, phonebook and sms for example. I CAN connect to the reader but i cannot send any commands or recieve any data.

What are the commands i could use to access data held on the device. The chipset is pl-2303

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