C# - Keyboard Messages Windows Flow - Catching The WM_KEYDOWN Message Through WndProc
Sep 16, 2009
I'm developing a program where I've had to add a keyboard shortcuts system. The problem is it uses a third party OCX for a part of its display, and it is catching some essential WM_KEYDOWN messages when in focus, like Ctrl+C, Ctrl+V, etc. I've tried catching the WM_KEYDOWN message through WndProc, but the message is not propagating, so I guess the keyboard messages go from the inner container to the outer one, don't they?
The WM_KEYUP messages can be caught tho, but I'd prefer to be able to catch some of those messages on the KeyDown event. I'm aware I could make some low-level hook, but I'd like to avoid this workaround. Well, if the WM_KEYDOWN message goes from the OCX to its top level container, I guess I'll have to treat those key combinations in the KeyUp event.
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Jan 23, 2009
Is it possible to catch windows messages when the application isnt in focus ?, its not for anything in particular, I have just been playing with wndproc and was just wondering
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Jul 11, 2011
I'm inheriting ComboBox and want to implement some special processing for Copy/Cut, I have the code below to handle it, but unfortunately the Copy/Cut message code is not sent to WndProc. The same code is working properly in inherited TextBox.[code]....
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Oct 8, 2009
I am capturing a few system command messages (namely minimize/maximize/restore). Inside the WndProc override I am trying to change the form's Me.ShowInTaskbar value but it is causing weird behavior in that minimization and restoration does not occur properly.Can anyone think of a reason why changing this property would interfere with this? The reason I don't really want to post code is because duplicating the effect takes a bit of code/setup. My initial thought was that changing the property's value is somehow sending another windows message and canceling the one I am currently manipulating. I realize this is a little vague but it's a shot in the dark.
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Oct 3, 2010
where Windows Message constants can be found in the framework?Example: msg=0x2 (WM_DESTROY) hwnd=0x24038c wparam=0x0 lparam=0x0 result=0x0
I captured that with ...
Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
MyBase.WndProc(m)
[code].....
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Jan 6, 2010
create a message box that stores my user name, message, and post datetime into the database as messages are sent. Soon came to realise, what if the user changed his name? So I decided to use the user id (icn) to identify the message poster instead. However, my chunk of codes keep giving me the same error. Says that there are no rows in the dataset.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim name As String
Dim icn As String
Dim message As String
[code]....
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Dec 10, 2011
I want to use spy++ or Winspector But from what i Read they Dont work on windows 7 64bit Correct ? Im trying to read WM_COMMAND Messages from a App.And whenever i Select 'Log Messages' And find the windows etc.Nothing show's up. Is there a alternative ?
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Jun 15, 2011
I'm currently trying to write a program that will clone input from one program and broadcast it to 4 other windows (Mouse and keyboard, with the exception of the enter key). This is for a World of Warcraft and it is legal. I thought that I would use setWindowsHookEx, but I can't figure out how to set it up that it only takes the input from one window and not globally.Can anyone recommend the best way of cloning keyboard and mouse messages ? or give me an example of how to set a windows hook for only one program ?
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Jul 21, 2009
where to find sample system with complete flow, database structure and data flow.. just for reference purpose.. system like inventory, payroll, accounting, billing and etc..
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Apr 21, 2009
I have a main form having a comobox with categories populated in it. for adding new categories I have a button1 on this main form. On button1 click I am creating and showing a new form2 for adding new category. I want this new added category in my main form combobox on closing this new form. I have checked mainform_activated even but it is not fired on close of form2.
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Jun 23, 2011
I am trying to play some WAVs within Media player and am confused at the order my code performs tasks in.
I need to use Windows Media player as my WAVs are 8 channel and just playing the WAV without using media player doesn't seem to support this.
I have a form with a button and a media player component on it
Her's my code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
AxWindowsMediaPlayer1.URL = ("C:ASOwl1.Wav")
[Code]....
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Mar 24, 2009
how to display the messages in several lines in the message box in vb.net
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May 24, 2010
I have the code below which works fine, however, if a mandatory field is not populated it prompts a message box, what I want to do is display ONLY one message box and show all the messages at one go, instead of one at a time. Also, I want the cursor to be prompting to the next mandatory field to be inserted according to the list.
[Code]...
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Aug 23, 2009
My application i am using on another computer (Windows Vista) has got a screenshot code inside a timer of 10 seconds. It works perfectly until the user Locks Windows.
When the user locks windows or switches user then the application throws a hissy fit and errors because it cannot take screenshot pictures.
Is there a way i can tell if the computer has been locked and the been unlocked
This way i can have a timer of 1 second and if the computer has been locked then the timer for the screenshots can been stopped , and then when the user logs back in the timer can restart.
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Jun 13, 2009
How can i show all my messages in a textbox,without deleting the previous message?
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Oct 13, 2010
I have created a virtual keyboard like the "Windows onscreen keyboard". So, I have used the method sendkeys.But if I click on the button, it doesn't write nothing.
I think I have a problem with the FOCUS.As you can see, the "Windows onscreen keyboard" is always on top.This doesn't happen to my form. How can I do?
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Nov 4, 2010
I've been whining for several months about the way Windows 7 prevents application exceptions from actually occurring, and arbitrarily assigns "compatibility settings" without actually detailing what those settings are, even during Visual Studio Debugging operations. Am I just completely ignorant to some setting I can toggle to turn all that garbage off and make Win7 act like an operating system that wasn't designed for a 2 year old? It never hurts to try. In a worst case scenario,
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Jul 23, 2009
I'm trying to send a key stroke to one application, through PostMessage. I am using too Spy++ to try to understand how to send the message, as I do not fully understand its inner workings. In this picture, the first item(selected item) was made with an actual key stroke made by myself. The one with a red elipse around it(below) was made with the following code:
[Code]...
I guess it must have something to do with the last PostMessage() parameter, but I can't figure out how it really works. I can see in the original key stroke the ScanCode = 48, and in mine its 0, and also fExtended is 1 and in mine is 0. How can I make it look the same? edit: Here is the msdn link. [URL].aspx I cannot understand the last parameter's working, if anyone does..
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Jan 4, 2010
oke On-Screen keyboard through my VB code. I am using windows 7 and below code to open the keyboard. Everytime when i run this code i am getting error "Could not start On-Screen keyboard".e to fix this error?
Dim proces As New Process
proces.StartInfo.UseShellExecute = False
proces.StartInfo.RedirectStandardOutput = True
[code].....
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Aug 31, 2010
how to process windows messages in vb.net , article, website or any.
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Sep 29, 2009
Where does VB .NET define common window messages like WM_SIZE, WM_Activate etc. so I can handle such messages?
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Oct 5, 2011
I'm Writing a program for my VET IT class at school, so other IT students dont ruin computers we have set up. the program is working great, with only one problem. the program carries out its task, even during debugging (Although it shows an error.) the problem is with windows. in order to stop users from pressing the windows key, the program turns of windows explorer when run, and turns it back off afterwards. before doing this, windows asks for permission. does anyone know how to use visual basic to automatically interact with this messagebox?i have uploaded a video showing my program in action and the problem. (Will Comment With the video when it is done oploading 108 minutes remaining...)here is my code
<REMOVED MALICIOUS CODE>
Below is an image of the error message i receive in visual studio, and when running the .EXE from the [attachment=25889:Untitled1.jpg
how do i automatically lcick continue on this error box, because my program runs fine when continue is clicked...
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Mar 16, 2012
I am trying to write some messages to a text file using debug.writeline("Message"). Here is the code.
Dim Tr As TextWriterTraceListener
Tr = New TextWriterTraceListener(System.IO.File.CreateText("Output1.txt"))
'Tr = New TextWriterTraceListener(System.Console.Out)
Debug.Listeners.Add(Tr)
Debug.WriteLine("Test Message")
I see the output1.txt file being created but nothing being written in the file.
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Sep 22, 2011
I have a .Net Console application which displays thousands of lines on the console each minute. I want to convert it to a Windows Service, however I still need a way of viewing these messages. There are far too many messages to write them to the event log or even a standard log file. I was wondering if there were a way to write a systray app that could simply intercept these messages from the service and display them in a console window. I have no need to save older messages, I only need to see current activity.
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Oct 27, 2009
I have a console application where I successfully have added custom menu item in the application's system menu using the Windows API calls. How do I hook into the events to capture the event raised when the user clicks on one of these menus? All my Google results talks about overriding the WndProc method, but this doesn't exist in a console application.
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Jun 5, 2009
This may seem complicated but it's a somewhat basic concept, just probably a complicated execution, I am trying to create a program that will allow you to basically "IM" between computers on a LAN network. That's the concept, I plan on doing this by generating .bat files, executing them and printing the last few messages sent in a label, the big problem I have is receiving messages, I have no idea whatsoever how to even go about finding out how to take the messages received from the messenger service and print them into the label, any ideas?EDIT: This is in VB.Net 2008
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Feb 24, 2009
we know that vb using windows messages for raising events etc.. so if we move mouse cursor windows sends mousemove message to our application (WM...) or something like that. my question is: can we send windows messages to an application? i know usage of sendmessage api but its not working. im simply wanna send wmkeydown message to notepad and notepad should get message and write it to the text area right? am i wrong? i tried several ways but didnt worked.
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May 21, 2011
i wanna add keys in my visual basic program and when i click ex:A it must write in textbox
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Oct 15, 2010
Visual basic 2008.I want to make an on screen keyboard exactly like the one in windows. I have made one which uses app activation, but that only works with the one you write in your codding or using a combobox to select one. How do you make one that works with everything like the one in windows.
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Sep 24, 2008
here I am again I have written a small class called 'Messages' that holds the user messages.The case is that I am not being able to import it. Here it is:
[Code]...
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