CTRL Commands Not Working with Winforms Web Browser

Lpatz-4663 20

Hello,

We have an application with a winforms web browser hosted on a WPF window and this browser is used to load HTML's within our application. These HTML files have fields that allow users to fill out. Letters and numbers work fine when put into the fields. The problem is when the user uses CTRL-C, CTRL-V, CTRL-X, etc. It seems like the CTRL commands aren't being sent to the web browser control and the user is unable to perform these actions when filling out the HTML.

Our application is accessing the winforms web browser through a DLL from a C++ application.

Any suggestions / advice is welcome. Thanks in advance!

Hui Liu-MSFT 40,266 Reputation points Microsoft Vendor

2024-04-23T02:30:42.87+00:00

Hello,Lpatz-4663. Welcome to Microsoft Q&A. Could you show a minimal, reproducible example without private information so I can reproduce the issue? And what are the steps to reproduce the problem?
Viorel 112.5K Reputation points

2024-04-23T04:32:06.4066667+00:00

Maybe it is caused by DLL or C++ application. Did you observe the issue in simpler circumstances, such as a Web Browser in a Forms application, or a Web Browser hosted in a WPF application? (The latter seems to work in case of simple HTML).

However, the Web Browser is obsolete and there is a modern alternative.
Lpatz-4663 20 Reputation points

2024-04-24T12:54:30.7766667+00:00
Thank you for the responses! What are the alternatives to the winforms web browser? @Hui Liu-MSFT

(Sorry I cannot tag you Viorel, but please feel free to respond!)

We tried the WPF Web browser and encountered a problem with the pasting of data. When a user could paste the data they copied or cut, it would paste multiple times. User would hit paste once and the data would appear more than once. We are hooking the Windows Message KEYDOWN and passing it to the WPF web browser using the TranslateAccelerator() function.

Any suggestions or advice is welcome. Thank you again!

Below is a code snippet of this:

private IntPtr KeyPressHookCallBack(int nCode, IntPtr wParam, IntPtr lParam) { try { if (nCode == HC_ACTION) { MSG msg = (MSG)Marshal.PtrToStructure(lParam, typeof(MSG)); if (msg.message == WM_KEYDOWN) { if (webBrowser.Visibility == Visibility.Visible) { // Pass the KeyDown to the WebBrowser ((IKeyboardInputSink)webBrowser).TranslateAccelerator(ref msg, ModifierKeys.None); return (IntPtr)1; } } } } catch { } return CallNextHookEx(m_keyPressHook, nCode, wParam, lParam); }

Hui Liu-MSFT 40,266 Microsoft Vendor

Hi,@Lpatz-4663. Not sure about your complete code. Could you handle keyboard events directly within your WPF application and then simulate the corresponding actions in the hosted WinForms WebBrowser control.

Handle keyboard events in your WPF application using the PreviewKeyDown event or other appropriate event handlers. Based on the keyboard input, simulate the corresponding actions in the WinForms WebBrowser control.

private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
 {
     if (e.Key == Key.C && Keyboard.Modifiers == ModifierKeys.Control)
     {

         webBrowser.Document.ExecCommand("Copy", false, null);
     }
     else if (e.Key == Key.V && Keyboard.Modifiers == ModifierKeys.Control)
     {
         webBrowser.Document.ExecCommand("Paste", false, null);
     }
     else if (e.Key == Key.X && Keyboard.Modifiers == ModifierKeys.Control)

     {
         webBrowser.Document.ExecCommand("Cut", false, null);
     }
 }

Lpatz-4663 20 Reputation points

2024-05-02T12:47:49.28+00:00

Thank you!
Hui Liu-MSFT 40,266 Reputation points Microsoft Vendor

2024-05-03T09:08:00.9366667+00:00

Hi,@Lpatz-4663. Thanks for reply. Did my solution solve your problem? If so, I can convert it into an answer and you could accept it as an answer. It's helpful for community members with related questions.
Lpatz-4663 20 Reputation points

2024-05-03T16:00:20.7533333+00:00

Hi, the solution you provided gave us an idea on how to fix it on our end. I will mark it as the answer, so feel free to convert it. Thank you for your time.