can i in some way change the power that the usb sends to a usb device?i want to connect a computer fan to the usb and control the speed is this posible??
View 1 RepliesI am in the process of designing a computer control program to control a HF communications receiver (radio), and have found a problem with the Serial port. I am using VB Express Edition 2008. This module of the program is supposed to take an input string from another part of the program, format it, break it into 4 bytes, and send it to the radio in hex form via COM port 1. The problem comes in when you try to enter a frequency with an 8 or a 9 in it. The 8 or 9 is usually replaced by 45, ex.-input 9900, receiver tune 4545. The exact same thing happens with 8's, input 8800 and receiver tune 4545. All other numbers other than 8 or 9 work fine. The strange part of it is that sometimes the 8's and 9's work, and work correctly. For instance, 900, 1900, 2900, 3900, 4900, 5900, 6900, and 7900 all work correctly. This led me to believe that is may only be when the 8 or 9 is in the first position, but that is not the case, it also shows up in other positions as well. All other frequencies that do not have 8 or 9 in them also work. I ran into this same problem with VB Express 2005, and worked on it for weeks before giving up and going back to VB6.0. This same module (with exception of the port open command) runs flawlessly under VB6. I have even tried importing the MSCOMM control from VB6, but it gives the same results. In de-bugging mode, all of the inputs, decimal and hex seem to be correct, so the problem must come in after you click the command button, but before it leaves the COM port.
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Currently, i am trying to connect the EPP (Encrypted Pin Pad ) device to my computer by using mscomm control. May i know what are the possibility problems may cause the DSRHolding does not return to "True"?
View 3 RepliesWhere to start for making a quick routine to check current download/upload speeds? I do have a web server I could download from but need some info on where to start?
View 1 RepliesI need to send data via serial and wait for and answer (VB.NET).Right now i'm doing it this way:SerialPort1.Write(sel & Chr(13))Thread.Sleep(50)aaa = SerialPort1.ReadExisting()If i do not thread.sleep, i get nothing, i supose it's because the machine is too fast.
View 1 Repliesmy code to read from serial port and store it in a variable?
Public Class Form1
'SerialPort object creation
WithEvents mySerialPort As New IO.Ports.SerialPort
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I have this code below for a client module, to allow the client to connect to multiple servers, though a IP list. The problem is that it is connecting ok to the servers, and it is sending messages to servers, but is not receiving messages FROM servers.
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I want to make a final project to the university there will be button when you clicked the computer will listen to you and print. what are you say in text box or in rich text box on the screen note: i'll start from zero i know nothing about this but i hope do this project or the project "save audio file in picture" but i like this one "computer listen to me". i'll use vb.net express 2008.
View 4 RepliesI'm trying to figure out, how I could access a webcam on another computer withing our network. It could be P2P as well.
View 1 RepliesI'm trying to develop a windows application where i can get connected to remote server and look for process state going in remote server.We have many remote servers where automatic installation of software going on. We have an xml file(installstatus.xml) where it tells us at what stage the installation is (Example : Inprogress , Completed, Failed.)
So our aim is to develop a windows application where i can get connected to that servers and look for their installation status(may be we can use installstatus.xml to look for installation status). Every time i connect to a server, the server information should get stored in XML file(i want to create a xml file where all the servers list i connect to should get stored)
The UI at left side should will have list of servers i can connect to. When i get connected to server, at right side of UI, i want to display the status of installation (In progress, failed , completed).
im trying to make a program that connects to several websites and parses some information out and then add the information to a listview list.The listview have 2 columns: Site and Nuts. So i load a bunch with urls in the site columns (that isnt a problem) but the problem is to take 5 websites at the same time and connect to them and then write "OK" in the Nuts columns.
In VB6 i could easily make 5 sockets, and then move down five items in the listview, save each of the listview text to a variable and connect to each variable with different socket, but how i add the information to the column "Nuts" is also a challenge in vb6. In the other hand, in vb.net i haven't yet got the skills to do so.
I have a simple chat program i have made, it works but with a few errors.
1st if it can't find the physical pc it is trying to connect to it crashes.
2nd if it finds the physical server but not the program (server) running it says "the computer actively refused the connection on IP/Port" and then crashes.
Code for connect button:
IP = txtboxip.Text
Port = txtboxport.Text
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I am trying to connect to copy some files to another computer on LAN, but the problem is it asks for user name and password, now how do i provide user name and password through my application
View 6 RepliesI have a webbased proj. What i need is to connect the vb.net app to an sql server via internet. My projects run fine in a standalone pc.
View 3 RepliesI'm using vb2008 with DB Msaccess 2003 in the first my language it's not very well so I'm sorry fro bad expression I have two computer ( Pc1,Pc2)I put the program(exe) with DB on the PC1 , then I put the program(exe) on the pc2 the pc1 connect to pc2 how do I deal(connect) with DB from Pc2 ?
View 13 RepliesHow can i connect a scanning device to a computer using .net? Code 128.
View 4 Replieshow to connect to a database of another computer in same local network using vb.net? We already enable remote connection in the sql server configuration and also sql browser and we already connected with one another using wireless network. Here is our connection in vb.net
"Data Source=NEWUSER0602akzSQLEXPRESS;Initial Catalog=sample;Integrated Security=True" is there something wrong with this? because when i input a data it always show me the error "An network-related or instance-specific error occurred while establishing to SQL Server"
how can connect to sql server 2005 or 2008 by vb.net from anther computer ? and this computer donot have sql server.i made search on internet and result was use sql client tools but i made search and try to download sql client tools but i did not get any result.so how can i connect to sql server 2005 or 2008 by vb.net on anther computer or on network LAN.
View 4 RepliesI created an executable file of an application done in VB Express 2010 which connects to a Access 2010 database. When installling the executable file at one of the user's computer, the file is installed correctly, but it fail's when trying to connect to the database. It says that Microsoft Dataengine cannot open the database. The user's computer doesn't have Access installed, does it need to be installed? or can I install a framework or application to avoid installing Access at the user's computer?
View 8 RepliesWhat happen if i want connect to a database server is not my computer local host, is another computer localhost in LAN network? how it works? [code] how about i wan connect the server is another computer localhost database?
View 1 RepliesI wrote a program in VB2005. It is a program that is supposed to run in a client computer accessing an MS Access .mdb file stored in the server. The program itself is stored and run in the clients computer. I am not good in networking at all. The way I do it now is:
1. Have a directory made in the server to hold the MS Access .mdb file, and have the directory to be shared.
2. Have the same directory accessed and mapped in the client computer (say to Z:)
3. Then have the program in the client computer simply access the database as if it is in the same computer (as the directory already mapped into the client computer). In the VB 2005, this is done when we set the connection string of the database connection.
However, my user is complaining that by doing so, the database is basically exposed to the operator of the client computer (through the mapped directory), hence more vunerable for any bad intentions from persons who may have access to the client computer but not the server. He insists that he used to have a program that does exactly the same thing like my program, but the database is shielded in the server, where it cannot be seen in the client computer (I have other people who confirm that this can be done, though they can't tell me how, since they are not programmers themselves). Now, I have no idea on how to connect a database that way, and I don't even know where to start looking.
Is it possible to control the download speed in vb.net
For example if the client downloading speed is 45kb per sec can i change to 40kb per sec.
i want this to only effect my application and not the web browser or any other applications.
Can We control Speed of Gif Images layers / Frams using VB
View 11 RepliesHow do I register the control?
View 4 RepliesI am using VB2008 SerialPort to communicate with a device. My problem is, using RTS handshake I am missing the first 50 or 60 chars, after that everything is intact. I tried to change the buffer size - Has no effect, used standard, bigger, smaller and no change.
The device timing says when it sends CTS signal, it will start listening 100ms after that. I have no clue how to delay the write to test this. Should I first write to the buffer then write to the port after a a 100ms timer event?
How do i exactly check internet connection speed.I have searched around google and found out a method w/c will Download a file like 1mb size, then it will calculate the speed.
View 1 RepliesI have a USB device that is "seen" as a COM Port. It has eight channels, each require a single character to turn ON/OFF. It's a DLP-IO8 for reference.
1-8 turns ON each channel
Q-I turns OFF each channel
Sending a "124" will turn on channels 1, 2 and 4.
I want to randomize ON/OFF with "on-the-fly" speed control.
cmbSPRan.Value is my NumericUpDown starting at 1 and ending with 10
RandomNumber = RandomClass.Next(1, 87654321)
SerialPort1.Write(RandomNumber)
Timer1.Interval = (cmbSPRan.Value) * 250
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I need a loop that I can still use the functions of the form (change speed or Stop loop).a way to utilize Q-I to turn the channels OFF randomly. I've tried Do Until, Do While loops and a few others.
how do i check the bandwidth (download speed and possible upload speed) of a user in vb.net or php that uses my app or visits my site resp?
View 1 RepliesI have a codes that calculates DownLoad speed and UpLoad speed kb/s. I would like to implement this kind. I also want to put such kind of graph. Any article or links where can I start building my own like that.
View 2 RepliesI am using VB10 Pro. I am trying to add an MSComm to a project. I have tried to follow this example: [URL] which utilizes VB6 but cannot. Instead I right clicked the mailbox, selected Choose Items, but could not find Microsoft Comm Control 6.0 in any of the tabs. After doing a search I found another example.
From that one you go Project | Add Reference | COM.
But again Microsoft Comm Control 6.0 does not show up in the list. Where is MSCOMM? Doing some further research, I do not have mscomm32.ocx in my C:WindowsSystem directory.