I want to essentially absorb key presses.
I'm currently using key preview on my main form and have an event handler for a key press that checks if the windows key is pressed. Is there a way to prevent the key press for leaving the application and opening the start menu?
There is an option for specific controls to suppress a key press, is there a way to suppress a key press to Windows?
The only way to intercept keyboard events outside your application is with P/Invoke SetWindowsHookEx. This will set a global callback to keyboard events agnostic of the focused application.
Several places to start looking:
How to disable windows startmenu using vb.net?
Disable Windows Key [Resolved] - has a reference to SetWindowsHookEx
Disable CONTROL + ALT + DELETE and Windows(win) Key in Windows 7 using Win32 application
Related
I have a question about renaming soft keyboard keys in Windows Store Apps (C#).
Is it possible to rename soft keyboard key?
For example, I need to rename key "Enter" to "Send". Is it possible?
It is not possible to rename a soft keyboard key. Here is further information on the touch keyboard, which details how it is a system component (so changing it from an app isn't possible).
I have a bar code scanner that presents itself as a USB-HID keyboard.
How do I capture scanned bar codes in my c# WPF application, if the app currently does not have focus?
When a barcode is scanned, the scanner sends one or more configurable prefix keypress events, then the barcode itself, then some postfix keypresses.
If the application has focus, I can use the prefix hotkeys to focus a specific textbox; then the barcode is automatically entered into this textbox.
If the application does not have focus, how can I receive the barcode?
I could register a global hotkey via pInvoking RegisterHotkey from User32.dll, as outlined e.g. here:
How can I register a global hot key to say CTRL+SHIFT+(LETTER) using WPF and .NET 3.5?
Global hotkeys in WPF working from every window
But how do I capture the following keyboard events containing the bar code?
I am a little dubious about this approach as well, is there a simpler way to capture a string prefixed by a specific hotkey, without having focus?
I have been trying to capture the keys pressed outside of my winform, but obviously a KeyPress event won't work.
I haven't been able to get any closer than the KeyPress event, which only works on the form level, as specified
I suspect that I will have to do the
[DllImportAttribute("user32.dll")]
, but I have little to no experience with that.
Being able to capture key presses anywhere requires using Hooks.
There is a library on CodePlex which simplifies implementing Application and Global Mouse and Keyboard Hooks for C# users.
I want to know how can i detect which key pressed (for example on Desktop or my computer ).
when detect pressed key show it with MessageBox
how can i do this?
Detecting the key presses outside of your application requires installing a Low Level Keyboard Hook. Here is a CodeProject article demonstrating the process.
I created one desktop application in C# with installation version.
I installed this application onto the machine. Now I want to open this application by pressing the Ctrl key of keyboard.
That is when the user press the Ctrl key my installed application is open.
How can I open a particular search page of my application by pressing a particular key of the keyboard?
Like the Picasa software.
Well this is no programming but a Windows feature. You have to define a shortcut for that application by opening the property page of that shortcut. There under the shortcut tab you can define the shortcut keys.
For the search key you probably have to attach your main form to the KeyPress event.
Defining key in Shortcut (link) properties would work but not if want just the Control key to activate. To do this you need another application, running in background and auto-starting that listens to keyboard events (hooks).