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Looking to create a global hook to intercept WM_WINDOWPOSCHANGED messages. So far all attempts to create a hook always end up not functioning properly. I create the hook then filter out messages that aren't what I'm looking for, but it always seems to make all non-system processes that are running crash.
My Code:
Public Class WM_WINDOWPOSCHANGED
Shared Event WindowMoving(ByVal handle As IntPtr)
Shared hookhandle As Integer
Shared hookhandler As HookHandler
Private Sub New()
End Sub
Public Shared Sub CreateTheHook()
'If hookhandle = 0 Then
' hookhandle = User32Imports.SetWindowsHookEx(CInt(HookCodes.WH_CALLWNDPROC), hookhandler, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()(0)), CInt(0))
' MsgBox(hookhandle)
'End If
hookhandler = New HookHandler(AddressOf ChangeButtonHost)
hookhandle = User32Imports.CreateSystemHook(Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()(0)), hookhandler)
If hookhandle <> 0 Then MsgBox("hi")
End Sub
Shared Function ChangeButtonHost(ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr)
If nCode >= 0 Then
Dim cwps As CWPSTRUCT = DirectCast(System.Runtime.InteropServices.Marshal.PtrToStructure(lParam, GetType(CWPSTRUCT)), CWPSTRUCT)
Dim winfo As New WindowInfo(cwps.hwnd)
If cwps.message = &H46 And WindowInfo.IsValid(cwps.hwnd) And winfo.ShowInTaskbar = True Then
RaiseEvent WindowMoving(cwps.hwnd)
End If
End If
Return 0 'User32Imports.CallNextHookEx(hookhandle, nCode, wParam, lParam)
End Function
End Class
Friend Class User32Imports
<DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Friend Shared Function SetWindowsHookEx(ByVal idHook As Integer, ByVal lpfn As HookHandler, ByVal hInstance As IntPtr, ByVal ThreadId As Integer) As Integer
End Function
<DllImport("user32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Friend Shared Function CallNextHookEx(ByVal idHook As Integer, ByVal nCode As Integer, ByVal wParam As IntPtr, ByVal lparam As IntPtr) As Integer
End Function
End Class>
EDIT: CreateSystemHook was my attempt at doing the hook code in C++, that also failed.
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It's not going to work. You can't implement system-wide hooks inside managed code. You'll have to write a C++ "normal" .DLL to handle the hook, then expose an itnerface you can use to talk to managed code, like C# or VB.NET. .NET does not support the exports required of a .DLL to support a system-wide hook. It'll work for a "local" hook. That is, hooking your own application, but not system-wide. You can find Microsoft's documentation on it here[^].
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Thanks for the response. I've looked at the MSDN docs for hooks, and created a C++ version, but I'm getting the same results.
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Thats for the mouse and keyboard hooks right? Neither will work in this case.
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Hey guys i'm building an application with a multi tab interface, i have a textbox above and a tabstrip below.
What i want is for the textbox to remember the entry of the active tabpage even after switching back nd forth b/w tabs, for example i want to able to create a new tabpage with a texbox entry "hello", and a second tabpage with a different textbox entry like say "world" but still same textbox and wen i switch b/w tabs, i want the textbox to still hold the textbox entry for each tab... Just like tabs in firefox browser... I tried creating instances of the textbox any time a new tab was created, but it did not work, all tabs still had thesame texbox entry.... Im really hoping u guyz find a solution cuz i've been tryin to solve dis prob for the past three days...
Note, am not creating a browser application and am pretty noobish.
I hope u guys get me.
Thanks in advance
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The text box would presumably be outside of the tab control. In that case you can handle the event of the user switching tabs to update the text box.
sphlynx wrote: Im really hoping u guyz find a solution cuz i've been tryin to solve dis prob for the past three days...
...
I hope u guys get me.
It would be easier if you didn't use text-speak.
"Im" has an apostrophe "I'm".
"u" either means you've switched to Dutch or you are lazy. The word is "you".
"guyz" is incorrect. To form a plural in English you generally add an "s", never a "z".
"cuz" is just laziness. The word is "because".
"tryin" is again lazy. The word is "trying".
"dis" is more laziness. The word is "this".
"prob" is seriously lazy. The word is "problem".
Seriously, if I had a child that wrote like this I'd send them to a remedial class.
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Thnks for d reply, tab switching is not the main thing here, wat i want is for d textbox to remember the text input entered wen tab1 is active, then wen u create a new tab, it clears the textbox and if another text is entered wen tab2 is active, it should also store it, then if u go back to tab1, the textbox should display the text input entered wen tab1 was last active and vice versa...
I dont think the use of proper english should be an issue here am not writing an essay or term paper, if u hav an answer to the question, pls kindly state it, instead of deviating from the issue at hand.
Thanks...
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sphlynx wrote: I dont think the use of proper english should be an issue here am not writing an essay or term paper
But it does make it very difficult for me to read. The reason essays and term papers for school, college or universities require you to write in proper English is to prepare you for the real world.
For example, I recently had to scope out some work for a client. In that I had to seek some suppliers for data that was needed for the solution. One potenatial supplier was the Royal Mail. They communicated like you in emails. They lost the sale.
If I can't read what you are tying to say then I find it difficult to help you. You have to help me (understand your problem) to help you (find a solution).
sphlynx wrote: if u hav an answer to the question, pls kindly state it, instead of deviating from the issue at hand.
I'm not deviating. I am trying to help you. You will find that if you write properly more people are willing to help you. That benefits you. Therefore by pointing this out to you I am helping you. I can work around the odd typo or slight grammatical error if English is your second language, but showing an arrogant disregard to the language you are attempting to communicate in will not help you.
If you want the text box to remember what was in it when a particular tab was active then create some sort of tab state object (i.e. create your own class to put things in) with a property to hold the information in the text box. Add an object of this class to the Tag property of each tab. When the text is updated in the text box then also update the property in your object.
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Hi Everyone,
I am building an app where it will be necessary to delete files from a drive.
This I have noticed will need some administrator privileges. I don't want to adjust
the UAC settings of the project. I just need this privilege at run time. I have been using
the System.Security.AccessControl class but to change the rights has not just been possible.
Can someone help.
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If your app requires the use of the user's admin account, you'll have to add a manifest to your project. You can follow this[^] for the step-by-step.
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I have a menu item control. Which has four buttons.On clicking each button show the
window, except the one button, which shows the show dialog windows.
After opening all windows other then show dialog window, and finally opening the show dialog window, I changes the windows states for all(i.e minimizing all windows.)
Now I am opening a window other then the show dialog window, by clicking the mouse on it(because this is presently in minimized mode).
Now I am unable to perform any action in this window.
My Question is , How should i bring the opened show dialogbox window in front of this non show dialog box window? So as to alert the user, to first perform any action on th show dialog box.
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Your question is difficult to understand, but I'm going to take a stab and say that you might have to set the TopMost property of your dialog window to True before you show it.
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Dave,
At which point u find the problem in understanding the question?
Thanks
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Beginning to end. It's not your English that has the problem. Most of your description makes assumptions that the reader knows exactly what you're talking about at all times without you explaining or assigning concrete references to objects and concepts.
modified on Monday, March 9, 2009 3:11 PM
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Dave,
How are you? 
ok, No Problem.
Sorry for not coming back in time.
Now, I am explaining the whole process again.
I have a form. In this form, I have a menu control, this menu control has four buttons.
On clicking the first three buttons, open the window with Show() event.
and the fourth button open the screen with ShowDialog()
Now, One by one I am clicking the button , so finally i have now four windows of this application.(Three with Show() and one with ShowDialog())
Right?
Now I am minimizing all the windows with the help of Window + D Button.
After this, If I use the keyboard(Alt+ Tab) keys. This is opening the showDialog window on top because , As suggested by you , I changed the TopMost = True for this showDialog window.
Now I come back to my problem.
Again, All the windows are minimized. In the taskbar and Startmenu properties , I have selected the Group Similar Taskbar buttons
This resulted in the heap of my application windows, one on the other.
I hope you have understood this point. By doing this , same kind of windows lie one on the other.
Now i click on one of my application window , and If I click the window other then the Show Dialog opened Window, this is not bringing the show dialog window to topMost.
This is the problem.
Please let me know if you still face any problem in understanding the question.
Thanks and Regards
Pankaj
modified on Wednesday, March 11, 2009 1:58 AM
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Many mice have a back button. Many applications implement a goback kind of function, mostly browsers. I'd like to capture a mouse back button so I can offer a similar functionality. Any idea how to tell if the mouse "back" button has been pressed?
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Well, you'd have to override your Form's WndProc and check for two messages. m.Msg 523 is WM_XBUTTONDOWN and 524 is WM_XBUTTONUP. This is, hopefully obvious, the pressing and releasing of any of the extra buttons on the mouse. When receiving either of these messages, look at the high-order word in the m.WParam property of the message. This will tell you which mouse "extra" button was pressed/released.
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I had considered intercepting the xbutton messages but the value of a button is programmable on most mice isn't it? Doesn't that mean that some other message is being sent which means "Back". Coding a specific mouse button would not use a mouse's programmed setting.
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I've gotten a bit closer. It looks like what I want is a virtual key, VK_BROWSER_BACK. It is also recognized as a key modifier, Keys.BrowserBack. These don't seem to come through in the OnKeyDown override. I've seen code samples that implement IMessageFilter.
Public Class Form2
Implements IMessageFilter
Public Function PreFilterMessage(ByRef m As System.Windows.Forms.Message) As Boolean _
Implements System.Windows.Forms.IMessageFilter.PreFilterMessage
Dim keyCode As Keys = CType(m.WParam.ToInt32(), Keys) And Keys.KeyCode
If keyCode = Keys.BrowserBack Then
Console.WriteLine("I found it")
End If
End Function
End Class
Of course this doesn't work either. It never finds Keys.BrowserBack. I've seen m.WParam have values 65568(10020h) & 65536(10000h) when I press my browser back key (xButton on the mouse).
Any ideas?
modified on Monday, March 9, 2009 2:25 PM
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The only thing I can suggest would be the documentation on WM+_XBUTTONDOWN[^].
Since the values in the Params are the result of the combining of smaller fields into a 32-bit value, you have to do some math to figure out what each of these fields means.
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Hello Experts
i am working on a VB 6.0 Project
i am using Datacombo1 and a Text box,
what i want that when i am typing in text box datacombo1 must
Highlighted matched items.
How can i do that.
Your Help will be appreciated.
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It looks like a DataCombo can have only one item selected at a time. I'm guessing you would have to handle the TextChanged event in the TextBox and search through the DataCombo's data, one item at a time, and find the first item in the list that matches what was typed. Then you take that index number and set the DataCombo's SelectedItem property with it.
No, I don't have any examples, 'cause I haven't used VB6 in over 7 years.
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hello
iam working on old soluation vb.net 2003
i have problem
i have general dataset
that used n reports
so i add new element in that dataset
and i update my report to see new field to add in report
but it can't see new filed
i need help
thanks
md_refay
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