.NET (Core and Framework)

Re: [VB.NET 2008] How to write in a textbox from another thread

29-Oct-13 8:35

steve_9496613 wrote:
I call another function of the form that should write my string in a text box:

Pass the data to display there as a parameter.

steve_9496613 wrote:
In this case, when I click the button the string dati is empty... I don't know why.

Access to the form's field isn't thread-safe. You could lock it in a property, but that slow down things nicely. Hence, I'd suggest to create a list of bytes on your receiver-thread, and to pass this as a paramater to the form, say, once a second.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

steve_949661330-Oct-13 3:45

Re: [VB.NET 2008] How to write in a textbox from another thread

30-Oct-13 3:45

Thanks Eddy.
I have modified the first function as you suggested to do for the second one:

Public Sub ScriviTesto2(ByVal dato As Byte)
  Dim str As String

  If InvokeRequired Then
    Invoke(New Action(Of Byte)(AddressOf ScriviTesto2), dato)
    'Invoke(New Action(AddressOf ScriviTesto2))
    Return
  End If

  Try
    'str = Hex(byt)
    'dati &= str & " "
    str = Hex(dato)
    dati &= str & " "
    TB1.Text &= Hex(dato) & " "
    'TB1.Text = dati
  Catch ex As Exception
    MessageBox.Show(ex.ToString)
  End Try
End Sub

In the receiver thread I call this function every byte I receive, passing to it the byte just received.
As before the string dati grows byte by byte so I can say that I correctly pass the parameter dato to this function but nothing is written in the text box TB1.
Writing byte by byte in a textbox is not the fastest way but I just wanted to see if passing data as parameter to the function could be the solution.
Perhaps the text box is not the right objet to use or, more likely, I'm missing something important.

I did another try: as you suggested I created a byte array in the receiver thread, I fill it with the bytes received and at the end of data reception I call another function in form1 passing to it the byte array:

Public Sub ScriviTesto4(ByVal datiIn As Byte())
  Dim i As Int32

  If InvokeRequired Then
    Invoke(New Action(Of Byte())(AddressOf ScriviTesto4))
    Return
  End If

  For i = 0 To (datiIn.Count - 1)
    TB1.Text &= Hex(datiIn(i)) & " "
  Next
  TB1.Text &= vbCrLf

End Sub

Running step by step in debug I see that the array datiIn contains the right bytes and also the TB1.Text contains the right values but I see nothing in the text box in the form!

What I'm doing wrong?

Eddy Vluggen30-Oct-13 11:06

Re: [VB.NET 2008] How to write in a textbox from another thread

30-Oct-13 11:06

steve_9496613 wrote:
Perhaps the text box is not the right objet to use or, more likely, I'm missing something important.

It's not optimal, but it should display some text. That's what it's there for.

steve_9496613 wrote:
Running step by step in debug I see that the array datiIn contains the right bytes and also the TB1.Text contains the right values but I see nothing in the text box in the form!

Did you create the textbox on the mainthread?

For i = 0 To (datiIn.Count - 1)
      string x = Hex(datiIn(i)) & " "
      TB1.Text = TB1.Text + x
    Next

Can you write the string x to the debugger?

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

steve_949661330-Oct-13 22:13

Re: [VB.NET 2008] How to write in a textbox from another thread

30-Oct-13 22:13

Eddy Vluggen wrote:
Did you create the textbox on the mainthread?

I added the textbox to the form1 in the designer, it should be in the main thread.
In form1 I declared an instance of the class to manage the COM:

Dim NewCom As CommDev

In the Load event of the form I create the new object:

NewCom = New CommDev()

In the New function of the class some parameters are set, like baud rate, parity, etc.

When I open the COM port, I call an Init function that opens the COM port, sets buffer sizes, sets the device control block, sets timeouts, creates and starts the receiver thread.

Eddy Vluggen wrote:
Can you write the string x to the debugger?

I used your code instead of mine and I can see the value of the string x, I mean that I can "add an expression control" (I don't know if this is the right translation of the italian "Aggiungi espressione di controllo" that appear in the right click menu over a variable during debug) to the string x and see its right value in the bottom windows of Visual Studio.
Nothing appears in the textbox...

I made also another try:

Public Sub ScriviTesto4(ByVal datiIn As Byte())
   Dim i As Int32

   If InvokeRequired Then
     Invoke(New Action(Of Byte())(AddressOf ScriviTesto4))
     Return
   End If

   For i = 0 To (datiIn.Count - 1)
     TB1.Text &= Hex(datiIn(i)) & " "
   Next
   ScriviLabel(TB1.Text)  'write the textbox text to a label in the form
   TB1.Text &= vbCrLf

 End Sub

 Private Sub ScriviLabel(ByVal stringa As String)
   Label1.Text = stringa
 End Sub

What I can see in the debug is that TB1.Text, stringa and Label1.Text all contains the right values but nothing appear in the window of my application.

It seems to be a "visualization" problem, perhaps related to threads, but I'm not able to see the error.

Eddy Vluggen31-Oct-13 9:11

Re: [VB.NET 2008] How to write in a textbox from another thread

31-Oct-13 9:11

Can you add another label on the form?

Private Sub ScriviLabel(ByVal stringa As String)
   Label1.Text = "Hello world"
   Label2.Text = stringa
 End Sub

This is the point where I'd paranoidly check the colour of my font.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

steve_94966133-Nov-13 21:19

How to read a text file containing Arabic chars in VB.Net 2005?

3-Nov-13 21:19

Hi Eddy,
thanks for your efforts.

I add the second label but no label takes the right content in the form; in the debug the Text properties contain my string and the "Hello world" string.
I also call the Refresh method of labels and form but nothing changes.

Before I did another project where I used the SerialPort object of .NET, everything was in the form1 and I used the DataReceived event of the COM to write in the textbox the received data, always using the Invoke method, and everything was OK.
In this project I don't use the SerialPort object but the API in coredll.dll (CreateFileW, ReadFile, SetCommMask, etc.) because I need to catch different information from the COM port and all this is in a separate class/file.
This is the main difference between the two projecs, in addition to the fact that one works and the other not...

Sorry but I really don't know what is THE fundamental information I'm missing to solve this problem, if you have any questions, please feel free to ask.

dgthecodeproject29-Oct-13 1:51

dgthecodeproject

29-Oct-13 1:51

Greetings,

I have a text file that include english characters and arabic characters as well..These characters are mixed with each others..

I have to read this file chars by chars including even the spaces..Though I used the following code but it didn`t get me the write result:

Dim objReader As New System.IO.StreamReader(pfile)
Dim strAll As String
strAll = objReader.ReadToEnd

In this code I read all the content of the file; But unfortunately the length of the Varaible strALL was less than the number of chars in the file...

Please help me to read this file properly in order to store it in a database correctly...

Thanks in advance..

Re: How to read a text file containing Arabic chars in VB.Net 2005?

Eddy Vluggen29-Oct-13 8:29

Error with Assembly reference

29-Oct-13 8:29

dgthecodeproject wrote:
But unfortunately the length of the Varaible strALL was less than the number of chars in the file...

How did you determine the amount of chars in the file?

Download Notepad++ and check the encoding of your file. Assuming it's saved in Unicode, below should work;

Console.WriteLine(System.IO.File.ReadAllText(pfile, Encoding.Unicode))

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

indian14328-Oct-13 7:43

indian143

28-Oct-13 7:43

Hi All,

I have a web application called Web, that is referencing an assembly called Lab, lab is using cplustools.dll and Calinx.dll assemblies.

When we run the application both the dlls are going to be copied in to the web applications bin folder. Upto this its normal. But the Web application throws an error as below. And when we go to the web applications bin folder and remove the "cplustools.dll" dll file and refresh the browser the application runs normally. I am not sure why we need to use cplustools.dll and Calinx.dll
Libraries. But the most important thing here for me is, how can I avoid deleting the cplustools.dll from bin folder and run the application directly without deleting it. What is causing this problem I am unable to understand. I ran the cplustools.dll with assembly walker application to find the dependencies. There is one warning with delay loading of IRFrame.dll except that nothing seems wrong.

Could the delay loading of IEFrame.dll be a problem, please give your advice any kind of help a link, or an advice or snippet, anything would be helpful. Thank you very much in advance.

I am not understanding what could be the reason for this error. Please help me in resolving the error. Any kind of help any link is very helpful. Please help me I am in urgent need. Thanks in advance.

Server Error in '/BPN' Application.
--------------------------------------------------------------------------------
 
The specified module could not be found. (Exception from HRESULT: 0x8007007E) 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
 
Exception Details: System.IO.FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)
 
Source Error: 
 
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  
 
Stack Trace: 
 

[FileNotFoundException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)]
   System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0
   System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +43
   System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +127
   System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +142
   System.Reflection.Assembly.Load(String assemblyString) +28
   System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46
 
[ConfigurationErrorsException: The specified module could not be found. (Exception from HRESULT: 0x8007007E)]
   System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +613
   System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +203
   System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +105
   System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178
   System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +54
   System.Web.Compilation.CodeDirectoryCompiler.GetCodeDirectoryAssembly(VirtualPath virtualDir, CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories, Boolean isDirectoryAllowed) +600
   System.Web.Compilation.BuildManager.CompileCodeDirectory(VirtualPath virtualDir, CodeDirectoryType dirType, String assemblyName, StringSet excludedSubdirectories) +125
   System.Web.Compilation.BuildManager.CompileCodeDirectories() +265
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +320
 
[HttpException (0x80004005): The specified module could not be found. (Exception from HRESULT: 0x8007007E)]
   System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +58
   System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +512
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +729
 
[HttpException (0x80004005): The specified module could not be found. (Exception from HRESULT: 0x8007007E)]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +8986035
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +85
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +333

Thanks & Regards,

Abdul Aleem Mohammad
St Louis MO - USA

Eddy Vluggen29-Oct-13 8:23

29-Oct-13 8:23

indian143 wrote:
Could the delay loading of IEFrame.dll be a problem

Looks more of a side-effect than a cause.

indian143 wrote:
FileNotFoundException: The specified module could not be found.

That's what's causing the error.

indian143 wrote:
And when we go to the web applications bin folder and remove the "cplustools.dll" dll file and refresh the browser the application runs normally.

Sounds like it's copying an outdated version to the output-folder. And it runs normal if the assembly is deleted from that folder? Then there's probably a correct version on the system, probably in the GAC.

indian143 wrote:
I am not sure why we need to use cplustools.dll and Calinx.dll

Presumably the "Lab" assembly uses them. Pharmacy and laboratory stuff, according to Google.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

indian14329-Oct-13 13:21

indian143

29-Oct-13 13:21

I got kind of half understanding about the problem from the above answer, but you didn't confirm me about the reason of the problem. Can you please give me a little more hint for how to solve the problem.

Yes may be we are referencing the old version of the dll, and system may contain the newer version of the dll, but still if I reference the dll from the system32 directory the problem still persists.

I am trying my head braking to resolve this issue, not a lot of help over the internet too, may be because the this component is specific for this client only.

Please help me it would be really great.

Thanks & Regards,

Abdul Aleem Mohammad
St Louis MO - USA

Eddy Vluggen30-Oct-13 11:02

30-Oct-13 11:02

indian143 wrote:
Can you please give me a little more hint for how to solve the problem.

Not really; you'll need to find out what version of the DLL is being expected.

indian143 wrote:
Yes may be we are referencing the old version of the dll, and system may contain the newer version of the dll, but still if I reference the dll from the system32 directory the problem still persists.

Create a clean build-environment, and make sure there's only one version of the assembly.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

indian14331-Oct-13 6:48

indian143

31-Oct-13 6:48

Hi,

As it was a product of another company, I don't have much knowledge or documentation for the dll, it is difficult to find the which is the correct version.
And another thing I doubt is, the dll is created on different OS, like may be xp or 2003 server etc. So may be this dll is referencing to some OS files that are not available in current OS or may be different versions of OS dlls.

Can we fix it by using any other means other than the above you mentioned? Its making everybody painful.

Thanks for your help.

Thanks & Regards,

Abdul Aleem Mohammad
St Louis MO - USA

Eddy Vluggen31-Oct-13 9:34

[VB.NET 2008] How to use DeviceIoControl function?

31-Oct-13 9:34

Find "a" working verion, and test it for full compatibility with your product. Delete all other instances of it, anywhere on the network. It'll be quite some hunting-work, but the only alternative is to download random versions of the internet. That sounds like a worse idea.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

steve_949661328-Oct-13 3:06

Re: [VB.NET 2008] How to use DeviceIoControl function?

28-Oct-13 3:06

Hello everybody,
I need to use the function DeviceIoControl to monitor the status of a COM port (RS485) but I don't know how to do.
I have declared the functions:

<DllImport("CoreDll.dll")> _
Shared Function DeviceIoControl(ByVal hDevice As Integer, ByVal dwIoControlCode As Integer, _
                       ByVal lpInBuffer As String, ByVal nInBufferSize As Integer, _
                       ByVal lpOutBuffer() As Byte, ByVal nOutBufferSize As Integer, _
                       ByRef lpBytesReturned As Integer, ByVal lpOverlapped As Integer) As Integer
End Function

Private Declare Function CreateFile Lib "coredll.dll" _
                       (ByVal lpFileName As String, ByVal dwDesiredAccess As Int32, _
                        ByVal dwShareMode As Int32, ByVal lpSecurityAttributes As IntPtr, _
                        ByVal dwCreationDisposition As Int32, ByVal dwFlagsAndAttributes As Int32, _
                        ByVal hTemplateFile As IntPtr) As IntPtr

Declare Function CloseHandle Lib "coredll.dll" (ByVal hObject As IntPtr) As Boolean

I use CreateFile (it works) to get an handle to the COM port and I pass it to DeviceIoControl:

Const FILE_SHARE_READ As Integer = &H1
Const FILE_SHARE_WRITE As Integer = &H2
Const GENERIC_READ As Integer = &H80000000
Const GENERIC_WRITE As Integer = &H40000000

Dim portPtr As IntPtr
Dim ris As Boolean
Dim InBuffer As String
Dim OutBuffer(100) As Byte
Dim BytesReturned, Overlapped As Int32

portPtr = CreateFile(com.PortName & ":", GENERIC_READ Or GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0)

ris = DeviceIoControl(portPtr.ToInt32, IOCTL_SERIAL_GET_COMMSTATUS, InBuffer, InBuffer.Length, OutBuffer, OutBuffer.Count, BytesReturned, Overlapped)

CloseHandle(portPtr)

I don't know what must be the value of IOCTL_SERIAL_GET_COMMSTATUS and I'm not sure that I'm using DeviceIoControl in the right way.
I have found some information only in C++ like:

C++

#define IOCTL_SERIAL_GET_COMMSTATUS     CTL_CODE(FILE_DEVICE_SERIAL_PORT, 27, METHOD_BUFFERED, FILE_ANY_ACCESS)

but how can I use it in VB.NET?

And then, DeviceIoControl should fill a SERIAL_STATUS structure:

C++

typedef struct _SERIAL_STATUS {
  ULONG   Errors;
  ULONG   HoldReasons;
  ULONG   AmountInInQueue;
  ULONG   AmountInOutQueue;
  BOOLEAN EofReceived;
  BOOLEAN WaitForImmediate;
} SERIAL_STATUS, *PSERIAL_STATUS;

but a structure is not just a byte array as in my declaration of DeviceIoControl (that I have found googling around).

Can somebody help me?

Thanks in advance.

David Knechtges28-Oct-13 3:14

David Knechtges

28-Oct-13 3:14

Is there a reason why you cannot use the SerialPort class within .NET? I use that for working with RS-485 ports in my projects. I use C# so my examples wouldn't help you unless you wanted to translate.

In any case look here:

http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx[^]

Re: [VB.NET 2008] How to use DeviceIoControl function?

steve_949661328-Oct-13 3:47

Re: [VB.NET 2008] How to use DeviceIoControl function?

28-Oct-13 3:47

Thank you David,
the reason I need to use DeviceIoControl is to catch the UART framing error that happens when I receive a DMX512 data packet.
I use the SerialPort class in trasmission without problem because I can create a correct DMX data packet with the starting break (line low - zero - at least for 88 µs) but when I receive data I can't get the break that starts the packet, I just get one zero, it doesn't metter how long the break is, but this break causes a framing error, so, if I get the framing error I get the start of the data packet.

David Knechtges29-Oct-13 3:13

David Knechtges

29-Oct-13 3:13

The SerialPort class has an ErrorReceived event, which contains the framing error. So you could use that as a way to start reading the packet then.

http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.errorreceived.aspx[^]

Re: [VB.NET 2008] How to use DeviceIoControl function?

steve_949661329-Oct-13 4:55

29-Oct-13 4:55

Yes, I tried to use the ErrorReceived event but it doesn't seem to work.
I use the DataReceived event to receive data and it works but I get no error, on the other hand I read in the help that:

...
PinChanged, DataReceived, and ErrorReceived events may be called out of order, and there may be a slight delay between when the underlying stream reports the error and when code can when the event handler is executed. Only one event handler can execute at a time.
...

However, I found another way using API and p/invoke: I use the function WaitCommEvent() to get directly the break instaed of the framing error.
This solution was suggested by Bruce Eitman in the MSDN Windows Embedded Compact forum and I found a good example in the article "Smart Device Print Engine for Compact Framework" by Orkun GEDiK here in CodeProject.

Thanks anyway for your interest and for your time.

timer events, vb.net

srinivasankrishnaa24-Oct-13 6:08

srinivasankrishnaa

24-Oct-13 6:08

How to use keypress event inside timer?
i have to use
Asc(e.keypress)=102 '102-Ascii value of "f"
e.handled=true 'stop the key from processing

all these has to be done even when the application is minimized

Eddy Vluggen24-Oct-13 8:09

24-Oct-13 8:09

What you want is not possible.

First, the keypress event is raised on the UI-thread. Whatever timer is being used, it will not be raised during the timer-event. You'd need to buffer them keys somewhere.

If the application is minimized, then no keypress-events will be generated - since your app does not have input-focus. You'd need a keylogger for what you'd want - which brings us back to your previous question.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

srinivasankrishnaa27-Oct-13 3:06

srinivasankrishnaa

27-Oct-13 3:06

I have a keylogger and it is detecting the key pressed.
but i want that the pressed key should not be processed to display on the screen what ever be the current application.

And How to have input-focus to my application.

Help me to solve these problems.......

Dave Kreskowiak27-Oct-13 5:34

Dave Kreskowiak

27-Oct-13 5:34

You're NOT going to use the normal form events for this, nor a timer.

You have to use a (Google for this Smile | :)

"global keyboard hook".

Since you just admitted to making a keylogger, you're on your own from now on.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

srinivasankrishnaa29-Oct-13 7:05

srinivasankrishnaa

29-Oct-13 7:05

Guys my aim is not to make a keylogger,i have to detect the ascii key pressed and block that keys from displaying and send my own characters to display.

But This keylogger detects only the key not the character.
with my minimized form i have to detect the ascii characters.How to do this?

I will explain What the exact process is to be done...

When I press any character in any editor the corresponding character should not be displayed on the screen(in other words Input Blocker) and instead of the blocked character i would like to disply my own characters.
i have to do this with my minimized form i.e when my form is in background and when it is closed the inputs should be displayed on the screen as i type.

help me guys plzzzzzzzz...............

modified 29-Oct-13 13:23pm.