Write And Read Bytes From Usb Device?

May 31, 2011

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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How To Read / Write / View Bytes

Jan 9, 2009

Im currently making a program and I was really thinking about adding a simple hex editor into it (nothing really fancy). I know how to read/write/view bytes already but im stuck on how i will make the interface and stuff. Ive been searching google for hours and i cant find anything.

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VS 2008 What Does This Line Exactly Do - I = Stream.Read(bytes, 0, Bytes.Length)

Dec 28, 2010

What exactly does this line do?

i = stream.Read(bytes, 0, bytes.Length)

Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.

i = stream.Read(bytes, 0, bytes.Length)
While (i <> 0)
Try
' Translate data bytes to a ASCII string.

[code].....

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Sep 22, 2011

I created a text file contains 4 bytes of data

AABBCCDD

I just want to read the first 2 bytes (AABB) to execute it with my program.

Then I'll need to read the last 2 bytes (CCDD) for another computer routines

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Interpret Bytes Received From USB Device In .NET?

Nov 1, 2011

I'm successfully receiving bytes from an USB device using a HID USB .net library.Here is a sample of my code :

Dim ptr As IntPtr = USB.USB_Read()
Dim buff As Byte() = New Byte(USB.USB_ReadLength() - 1) {}

[code].....

My question is : how can I know wich button is pressed ? Meaning : I just want my program to store the button pressed and do an action when pressed.

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Nov 25, 2009

ust want to ask if its possible for me to measure how many bytes of data does a device sent to my computer using vb.net?

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Nov 8, 2011

I receive the irc messages like this [code]...

This show the empty space where it auto-scrolls to when writing the received string to the console.

This shows the actual received message (a bit edited with time, etc ...)

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Nov 2, 2010

im just wondering if you guys could help me do this for a USB device via VB

1> Check for the plugged in USB devices.

2> Find out for the available space(2GB) on each.

3> Prompting a message to user on which drive he would like to write that movie file.(As At a time i want to give only 1 disk write only.

4> after selecting the Drive, and pressing OK, i just want to copy the selected file from HDD to that Device.

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Jul 1, 2011

I am writing a CSV File from a Database. I am stuck in writing lines which become greater then 1024 bytes collectively. It write line terminator after 1024 bytes and thus adds the remaining string to new line which obviously results what I don't want. Is there any way so that I increase the line length limit to some reasonable amount of bytes?

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If I received part 3 how would I write those bytes in the 20,000-30,000 byte section of a file?

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I have an old fashion Database with several files.I need to import to a new Sql Server dababase the data.There are tables with 6 Bytes numbers fields and we have no Number data type with that length.

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Jan 28, 2011

I want to read 15 bytes of data starting at byte 40 and ending at byte 55. I then want the value of the 15 bytes of data to print to textbox5. I know this should be a simple task but I'm having a lot of trouble figuring this out.

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Feb 4, 2009

how to write a null bytes onto unused hard disk spaces? I understand that files deleted are still existed on hard disk, I am thinking of may be if I write the null bytes to every single unused bytes so that the unused hard disk space would be become all null bytes, and unused space would no longer contain of those deleted files.

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Mar 5, 2011

I have an old fashion Database with several random access files and I need to import the data to a new Sql Server dababase the data. There are tables with 6 Bytes floating numbers fields and we have no Number data type with that length in VB. I tried and tried and... and can't find. I found this code in the ERP folder, is AlphaBasic. It use an envoirement namend A-shell from Microsabio .

[Code]...

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Nov 19, 2009

I have seen countless examples of reading standard output from command line applications which print text to the screen and one can read that back into the application as a string. I want to read the binary data back that is written to standard output from something such as image magick's convert program. What is coming back is an image, not a text result or error code. Is this possible? I have been looking for ages but found nothing that makes sense.

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Oct 4, 2011

I need to do some operations that require converting array of bytes to string and the other way. After struggling with it for a few hours I found out the core of my problems. Look at this piece of [code]...

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Nov 3, 2010

I have a tcpclient connection setup capturing a continuous http stream. For some reason after the first few bytes are read, the stream does not get any data for a long time. Is there a problem with my code?

Dim tclient As TcpClient = New TcpClient(url, "80")
nstream = tclient.GetStream()
If nstream.CanRead Then[code].....

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VS 2008 : BinaryReader To Read Bytes?

Apr 11, 2010

Why does this programmer use a binary reader to read bytes, why not the client.getstream.read or streamreader?

Case RequestTags.Connect
'sent from server to client informing client that a successful
'connection negotiation has been made and the connection now exists.

[code]....

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Barcode Scanner - Write Own Firmware For A Scanning Device?

Aug 29, 2011

i was wondering if it was possible to write my own firmware that will run on a device im making. This device is very similar to the price portable price checkers you see in grocery stores. it scans the barcode which returns an id number. More information about my device and about the big project im working on can be found here: My Idea For A New Type Of WCP (Wireless Connection Protocol)

[Code]...

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I am trying to write a VB program to automatically detect and identify a particular device that will only communicate to my program when I have 2 or more devices plug into the USB port. One way of doing it that I can think of is to scan through the available port and do a write and read to identified the port. But that would take up a lot of time if I were to scan through say 5 available port.

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Dec 13, 2010

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 line.how can i read information recived and sended.

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Mar 24, 2010

I have successfully gotten the filestream function to read a text file and return bytes. I want it to return letters, not bytes, using random access.

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Read The Bytes Then Substring From 0 To First Occurrence Of 0x00 In .net?

Aug 14, 2011

i tried to get the string from binary file by using this code..

[Code]...

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Feb 26, 2009

I am using sockets and such for a while now, and want to go an step further in this. Now for example lets say an client would send [lenghtofstringinbytes]string[somethingelseinbytes]another thing.
How can I send/read/parse it?

Now I am doing this:
Private Sub onDataArrival(ByVal ar As IAsyncResult)
Try
Dim obj_SocketState As StateObject = CType(ar.AsyncState, StateObject)
Dim obj_Socket As Socket = obj_SocketState.WorkSocket
Dim sck_Data As String
[Code] .....

So using Getstring for it, but thats not the way for this as you get nothing else but an empty string back. So I have to parse it without converting it to an string.

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VS 2010 Http Write ContentLength Bytes To The Request Stream Before Calling [Begin]G?

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I have this code that was working in a proof of concept app I had - but now will not work.

For Each ddfile As String In ddfiles Dim MyThread As Thread ' simple new thread Dim newFS As FSObject = New FSObject() 'new FSObject which is a file object I made up' used because i needed to keep the name and index matched so the callback function had something to work with

[Code]...

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C# - Read Sms From Mobile Device With .net Application?

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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?

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Read XML From A Device Through A Serial Port?

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

I want to read in XML and populate my controls. I'm aware of delegate and Invoke but I'm having a hard time working them into my XML portion or the opposite "working my XML into my serial port class".

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Cannot Correctly Read Bytes From Serial Port Consistently

Jun 4, 2009

I have a timer control that sends data to a hardware every 3 seconds. I sent 6 bytes of data. In return I am expecting 8 bytes of data in DataReceived event. First time I send 6 bytes of date, in DataReceived event, I get the expected 8 bytes. Then in next 3 seconds, again the expected 8 bytes of data is received. But after that I find that DataReceived is fired 2 times: first time I get 6 bytes and then I get 2 bytes. After that I again get 8 bytes as expected. So in short, 2 times I get 8 bytes as expected and 6 bytes and 2 bytes and again 8 bytes. This pattern is repeating continuously. Why? Is there any reason why I cannot get all 8 bytes everytime? Note that the code is in vb.net 2008

Code in button btn_Start ()
'Set serial port parameters
x.PortName = "COM1"

[Code].....

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I'm working on a project involving reading RFID tags, I've written the code and it reads the tags ok by using the recieved data handler and displaying the result in a listbox, the only problem is that the data displayed has a couple of unreadable characters at the start (I'm using ReadLine() command.)If I read the buffer byte by byte the data is all readable.How can I read and display the whole 16 Bytes in one go??

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