.NET (Core and Framework)

Re: Keypress Event,vb.net

2-Nov-13 22:23

In keypress event the character which i press should come after my input which i send using send keys.

here is the code

if asc(e.keychar)=102 then 'ascii value of "f"

system.windows.forms.sendkeys.send("A")

end if

"f" should come after "A",but it is displaying as "fA"

How to solve this guys....

Richard MacCutchan3-Nov-13 1:29

Richard MacCutchan

3-Nov-13 1:29

Your sendkeys message will not be handled unitl the original key message has been processed. You should do what was suggested in this response to your previous question[^].

Veni, vidi, abiit domum

Re: Keypress Event,vb.net

Shameel13-Nov-13 3:57

Shameel

13-Nov-13 3:57

You can set the SuppressKeyPress property of the KeyEventArgs supplied in your event handler to true and then pass on both A and F in the SendKeys.

custom ribbons toggle button do not unchecked (default state) after checking it on mail send button click

zakirhos2-Nov-13 20:36

zakirhos

2-Nov-13 20:36

Hi,

I have created a custom addIn for outlook 2007 using VS2010.

I have created a custom Ribbon using xml containing a single toggleButton control. This is for new message screen. After clicking the "New Mail Message" from outlook custom ribbon visible along with the toggle button. Once I pressed the toggle button and sent the mail the toggle button remains same (on press) for every new message later. Can anybody please help me how to make toggleButton getPressed status to unchecked for every new mail message click event.

Thanks.

Re: custom ribbons toggle button do not unchecked (default state) after checking it on mail send button click

Dave Kreskowiak3-Nov-13 4:06

Dave Kreskowiak

3-Nov-13 4:06

Why are you even using a toggle button? Why not a normal button??

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

not getting it

nissan12341-Nov-13 13:48

nissan1234

1-Nov-13 13:48

byte b1 = 4;
byte b2 = 2;

byte result = b1 - b2 //error here Cannot explicitly convert type 'int' to 'byte'. Are you missing a cast?

Question is : where does the compiler see the 'int' here, where all variables are byte?

Re: not getting it

TnTinMn1-Nov-13 15:03

TnTinMn

1-Nov-13 15:03

It is a feature of C#. The byte variables are widened to integers before performing the subtraction. Hence, the result is an integer. You can prove this to yourself with this:

object o = b1 - b2;
MessageBox.Show("o is a: " + o.GetType().FullName);

So to get rid of that nasty error:

byte result =(byte)(b1 - b2);

See: Why do operations on "byte" result in "int"?[^] for an explanation of why this was done.

Re: not getting it

Abhinav S2-Nov-13 19:50

Abhinav S

2-Nov-13 19:50

Go through http://msdn.microsoft.com/en-us/library/aa691376%28v=vs.71%29.aspx[^].
There is no operator on byte. Thus as already mentioned in an answer earlier, byte is converted to int and reverse conversion fails.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

text box,vb.net

srinivasankrishnaa1-Nov-13 0:14

1-Nov-13 0:14

Guys i am designing a editor,and in this editor i am using keypress event to block the pressed key and adding my input key to the text box.While adding the characters the scroll bar is automatically moving to the top of the page

i have used "textbox1.scrollcaret" also but it is always making the cursor line to be a last line.

Example
after few lines have been entered

if i add

if asc(e.keychar)=102 'For "f" ascii value of f is 102
e.handled =true
textbox1.text=textbox1.text + "c"

end if

How to solve this problem guys....

Re: text box,vb.net

TnTinMn1-Nov-13 17:33

TnTinMn

1-Nov-13 17:33

You are making it to complex.

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
   If e.KeyChar = "f"c Then
      e.KeyChar = "c"c
   End If
End Sub

This will work fine for the user using the keyboard, but have you thought about how you are going to handle the user pasting text? That will not get translated using this method.

Re: text box,vb.net

srinivasankrishnaa2-Nov-13 18:57

Replacing one character instead of other,vb.net

2-Nov-13 18:57

Thanks a lot "TnTinMn" this has solved my problem exactly.

srinivasankrishnaa31-Oct-13 4:41

Re: Replacing one character instead of other,vb.net

31-Oct-13 4:41

When I press any character in any editor the corresponding character should not be displayed on the screen and instead of the blocked character i would like to display my own characters in that editor.
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.

How to do this process?

Eddy Vluggen31-Oct-13 6:02

Re: Replacing one character instead of other,vb.net

31-Oct-13 6:02

You can't. Minimized forms do not receive input. Further, it'll never work for "all applications"; I doubt that Warcraft lets you modify the contents of the password-textbox.

Did you try the virtual keyboard I linked to in your previous post?

Bastard Programmer from Hell Suspicious | :suss:

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

srinivasankrishnaa31-Oct-13 23:59

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

31-Oct-13 23:59

ya i took those two lines of code but i dont know how to use it.
Can you give me any example how to use it......plzzzzzz.

steve_949661329-Oct-13 5:48

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

29-Oct-13 5:48

Hi everybody,
I have a simple project with a form and a class in another file to manage the COM port (from the article "Smart Device Print Engine for Compact Framework" by Orkun GEDiK).
I open the COM port and I start its thread for receiving data.
I want to write the received data in a textbox in the form.
To do this, every byte I receive, I assign the value of this byte to a byte variable of the form called byt and I call from inside the loop of the thread a function in the form that stores all the bytes in a string dati (in hexadecimal format):

Public Sub ScriviTesto2()
  Dim str As String

  If InvokeRequired Then
    Invoke(New Action(AddressOf ScriviTesto2))
    Return
  End If

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

This seems to work because if I run the code step by step I see that the string dati grows byte by byte and contains the correct values.
When there are no more bytes to receive, always from inside the loop of the thread, I call another function of the form that should write my string in a text box:

Public Sub ScriviTesto3()

  If InvokeRequired Then
    Invoke(New Action(AddressOf ScriviTesto3))
    Return
  End If

  TB1.Text &= dati & vbCrLf

End Sub

...this function write nothing in the text box... why?
The string data contains the right values, is not empty.

I tried another way: I don't call the last funcion (ScriviTesto3()) but, when there are no more bytes to receive, I click a button of the form that do the same:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  TB1.Text &= dati & vbCrLf
End Sub

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

I add the declaration of the involved variables:

Public Class Form1
  Public byt As Byte
  Protected dati As String
...

Can anyone help me?

Thanks in advance.

Eddy Vluggen29-Oct-13 8:35

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