I have textbox with vbscript, user could type integers, then hit return key, KeyUp event for return would trigge theWriteFile()being called for com port to write string to the device, if Ihit return key slow, I would get 0bytewritten for WriteFile(), timeout happening basically,if I hit return keyquick,
View 1 RepliesI keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.
Dim url = "https://domain.com"
Dim req As WebRequest = WebRequest.Create(url)
req.Method = "POST"
req.ContentType = "application/xml"
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I am running a Windows Form application, in a button called subroutine is controlling a series of events in a with a timer with 500ms ticks. There is an IO port that will send information asynchronously about another set of events that need servicing from an external device. I want to deal with the event from the IO port and return to the original subroutine, but it appears the once I complete the delegate subroutine called by the IO event, the program does not return to the subroutine that was running. Do I need to resort to polling or is there another solution through threading?
View 2 RepliesI am sending a POST request to an API server and I have reused code where I have successfully done this before on other servers and for some reason, which I cannot figure out why, it's not working. I get the error:
"Cannot close stream until all bytes are written."[code]...
I am sending a POST request to an API server and I have reused code where I have successfully done this before on other servers and for some reason, which I cannot figure out why, it's not working. I get the error:
Cannot close stream until all bytes are written."}
even though I declared the content length correctly and I am not sure what I am missing here...
data = data + "</posts>"
Dim postBytes As [Byte]() = Encoding.UTF8.GetBytes(data)
Thread.Sleep(10000)
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I have a testing platform that allows data to be posted to a real time collection system. It uses the StreamWriter object to send both HTTP and XML formats, It works fine, but there is a new request to submit uploaded files. This again works fine, unless the files are over 70k (we need to test upto 3MB). If it is over 70k, the response is the content-length too big. I have changed it so that the content-length is now set dynamically, dependant on the size of the file uploaded. However, when the StreamWriter.Close() runs, the execption The request was aborted: The request was canceled. is generated, with the InnerException Cannot close stream until all bytes are written.
From what I have found on the web, the solution is use StreamWriter.Flush(), but this code is already in place.
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I have a problem that i cant solve i am trying to buffer 28 bytes from the com port into the array actual_packet_VPS1(30). It works with the counter set to 0 - 15 but doesnt work when we increase the counter size to 0 -28.
Private Sub MSComm5_OnComm(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles MSComm5.OnComm
Dim buffer As Object
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i have a program that sniffs for packets on a port going to a specific address on my lan and then sends an exact copy to the same address on another port, the problem is when i edit the port bytes in the TCP packet i have to regenerate the checksum, and thats where the problem comes in, everything i have researched on this just doesnt make sense to mei am looking for a function that will output the checksum and a little explanation on what i need to put in for it to come out right
View 1 RepliesI'm working with a device using the serial port and i am sending a command from the pc to the device like this:
1. I Change the parity to mark
2. then send a byte
3. then Change the parity to space (here is the problem)
4. Send a lot of bytes
but the device just ignores all the last bytes, im pretty sure its a timing problems, so a timeout occurred attempting to send a command, how can i change the parity without losing time?
I'm using 2008 Express and I'm trying to send 1 byte of data on the serial port.
Serialport1.write(123) Sends 3 bytes with the ascii codes representing 1 2 and 3.
I want to send 1 byte that contains 123.
In my serial port application, I have my code -
Private Sub SerialPort_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort.DataReceived
Dim cnt2 As Byte
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For some packets I sent, "Error Data Received" came up. I checked BytesReceived, it was 0. My question is: since SerialPort_DataReceived processes data received, data was supposed to be received. Why the number of bytes I read was zero? BTW, when is this event accessed? it is accessed when any number of bytes received or the whole packet received?
How to return value from javascript confirm box written in scriptmanager.registerclientscript in asp.net.?Actually I want to give confirm box on text changed event of textbox of gridview.If user click yes then I want to update changed value and if user click no then it should revert back to old value.My dummy code is like this:
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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"
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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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How can i return the value? using bytes?
I am building an application in which sends an outside server data, it then shoots back data which pertains to what I sent. The problem that I am having is that the maximum amount of bytes tha will come back is 8001. The program works fine as long as the return byte value is less then 8001. Something with the max value sounds familiar but I can not pin point it. What else could I do to receive the rest of the data? This code snippet is where im getting problem:[code].....
View 1 RepliesI'm making a Visual Basic GUI application to display whether a number of my ports are open for people to know whether things like my website and my Minecraft server are open.My problem is I have absolutely no idea how to do this in Visual Basic.Basically, I'm asking for something which sends a signal to an IP with a specific port, if it is open then return true, if it's closed, return false. Similar to: http:[url]....
View 1 RepliesI've got a C#.NET background and due to circumstances I'm trying to make a plugin written in VB.NET. I've created a new class project which gives me a DLL. This class implements a C# interface which all works.My only question is this... In my C# code I've got an implemented DLL (which loads at runtime) with the following declaration before the class...
[Plugin(PluginType.Storage)]
public class XmlPlugin<T> : IStoragePlugin<T>
{
[code]....
How do I write [Plugin(PluginType.Storage)] in VB syntax?
I am a beginner in vb.net. I have made a project in this. Now I want to make it online.Also how to use asp.net with vb.net?
View 7 RepliesAnyone else have an issue using read, It appears when I use read it gives me the correct buys but returns the wrong integer value So I use it and it fills the Array i make with &h10, &h6 but read reutnrs number of bytes returned to 1. if there a better way to go with Vb.net with RS232 I mean really my projet dosent have anything out of the Normal
Friend WithEvents CashValidator As System.IO.Ports.SerialPort = New System.IO.Ports.SerialPort("COM1", 9600, IO.Ports.Parity.Even, 8, IO.Ports.StopBits.One)
CashValidator.Read(MyResponce, MyResponceLen, 4)
i want to make a website builder which has the html code already written so all you have to do is check which boxes you want and click next or back to go through the process of making a website with specific code implemented in it.
P.s. im using VB 2008 express edition?
In VB read HID, we detect the device successfully. When sending a 8 bytes command to the device,
type Reg Value Index Length 40 48 00 00 00 00 01 00
With the OutputReportlength=2, how to set the send buffer in the WriteFile function?
Well this works and that how i got it now:
Module:
CODE:
Well what i wanted to do is ask how could i write those alle 7 Bytes with 1 Line of code cause i dont really understand it. Cause it boring to write Byte by byte isnt there a way like in C++ it was : byte offsets() = {byte1, byte2, byte3} and so on something like that then i could do it but in Visual Basic.Net i dont really understand it.
Or if i want to NOP
Module:
CODE:
How could i make it NOP all those Adresses at once and take at once 7 Bytes and not that i have to do it in more lines
I am using CreateFile, WriteFile and ReadFile API calls to write some data to a USB device. The code I have works perfectly on 32 bit systems. CreateFile gets a handle to the device, pass that handle and some data to WriteFile and read from that handle with ReadFile.My problem is, the same code does not work on a 64 bit system. The error returned from WriteFile is 6, The handle is invalid. I've checked the handle for validity on the CreateFile call and it is a valid handle. A call to LastDLLError() returns 0 after CreateFile.The "file" is being opened for overlapped communication and the overlapped init calls are also returning their proper values.is there some sort of different consideration I need to make because it's a 64 bit system? A different flag? A different call altogether?
View 6 RepliesI want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
View 1 RepliesOk i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
View 2 RepliesWhat 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.
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I'm currently using an unmanaged library written in C++ and imported via <DLLImport()> to access a dos virtual device driver, and that works fine. However, I'd like to be able to do this via my .NET application (without requiring an accompanying DLL). So, I'm trying to write to the virtual dos device using the kernel32 API and WriteFile, however I receive the error: "Attempted to read or write protected memory."
Mapping to the device with DefineDosDevice and CreateFile (also in the kernel32 API) works fine and returns a valid file handle, however when I attempt to write to the file it fails. I've even tried marshaling the data to an unmanaged block of memory using InteropServices (AllocHGlobal and StructureToPtr) and then writing it from there, however I still receive the same error.
I'm working on a site that I've inherited that's built with ASP.Net, which I'm only slightly familiar with. One of the pages allows for a link to a document (word or pdf) that, when clicked on, prompts the user to save or open the file, but does not reveal the true path of the file. This way it prevents users from pasting a url to a file - the link is to an aspx file that checks for a valid session, and then retrieves the file.
Anyway, because there's a lot of legacy code, I need to do this with a bunch of static htm files as well, however these files need to be displayed rather than prompting the user to save them, which is what happens now. I tried changing the content type to application/text, application/html, text/html, etc. and that didn't work, then tried adding a response header of content-disposition inline. When I do that, build, and try linking to the file, I get a couple of runtime exceptions:
[FormatException: Input string was not in a correct format.]
Microsoft.VisualBasic.CompilerServices.Conversions.ParseDecimal(String Value, NumberFormatInfo NumberFormat) +206
Microsoft.VisualBasic.CompilerServices.Conversions.ToLong(String Value) +110
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Do I have to do something with an htmlwriter object or something? Can't I just have it open a new browser window with the file displaying or does it have to prompt the user if used in this way??
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In VB read HID, we detect the device as above successfully. (STM32L)
When sending a 8 bytes command to the device,
type Reg Value Index Length
40 48 00 00 00 00 01 00
with the nNumberOfBytesToWrite=2 (3rd paramater declared below), how to set the Buffer (2nd pramater declared below ) in the WriteFile function? Size of Buffer is within the limitation of OutputReportByteLength(=nNumberOfBytesToWrite).
[code]...