wndproc

问题 I want to create a form on a second thread that will receive messages in it's WndProc method. What is the recommended way to create an invisible form like this? Is setting "ShowInTaskbar=false" and "Visible=false" enough, or is there a "cleaner" way? 回答1: I'm not sure what you mean by "cleaner". The standard way to create a form that is invisible to the user is to set Visible and ShowInTaskbar to false. 回答2: As far as I know, what you're doing is against the rules (although, these things do

问题 I am writing a custom control in .NET Windows Forms. Consider the following code: protected override void WndProc(ref Message m) { base.WndProc(ref m); switch(m.Msg) { case WM_LBUTTONDOWN: // Yes, it's defined correctly. MessageBox.Show("Left Button Down"); break; } } It works when running, but I need it to work in the designer. How can I achieve this? NOTE: I guess someone might say that " You can't detect clicks in the designer because the design surface captures them and processes them as

问题 I am building a form in C# that uses the WM_NCHITEST event in the WndProc function. It works perfectly with no controls on the page, but when I added a panel to the page my WndProc function stopped receiving WM_NCHITEST events. Any idea what I can do to stop this? UPDATE : My window in normally borderless, but when I do run it in bordered mode the WM_NCHITTEST event is called when the cursor mouses over the window frame, leaving me to think that the form size control I have (Chromium Embedded

问题 I have a cancel button on my form. I want to determine inside the WndProc method that this Cancel button is clicked and write some code for it. This is absolutely necessary because otherwise I'm not able to cancel all other control validation events that are yet to be performed. Please help. .NET - 2.0, WinForms 回答1: This is how you could parse the WndProc message for a left-click on a child control: protected override void WndProc(ref Message m) { // http://msdn.microsoft.com/en-us/library

问题 If I have a console application with a handle to it set up like so; HWND hWnd = GetConsoleWindow(); Then how do I set up a new wndProc for the window? I tried using SetWindowLong(hWnd, GWL_WNDPROC, (LONG)conProc); With conProc being defined as LRESULT CALLBACK conProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_NCHITTEST: return HTCAPTION; } return DefWindowProc(hWnd, msg, wParam, lParam ); } But it doesn't work and says "Error code: 5 - Access is denied" on

问题 Form keydown and keyup messages aren't captured: public partial class Form1 : Form { const int WM_KEYDOWN = 0x100; const int WM_KEYUP = 0x101; protected override void WndProc(ref Message m) { if (m.Msg == WM_KEYDOWN) { log("down"); } if (m.Msg == WM_KEYUP) { log("up"); } base.WndProc(ref m); } } 回答1: You should override ProcessCmdKey instead This example is extracted from this article public partial class Form1 : Form, IMessageFilter { const int WM_KEYDOWN = 0x100; const int WM_KEYUP = 0x101;

问题 Please guide me how to use this WndProc in Windows Forms application: private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if (msg == NativeCalls.APIAttach && (uint)lParam == NativeCalls.SKYPECONTROLAPI_ATTACH_SUCCESS) { // Get the current handle to the Skype window NativeCalls.HWND_BROADCAST = wParam; handled = true; return new IntPtr(1); } // Skype sends our program messages using WM_COPYDATA. the data is in lParam if (msg == NativeCalls.WM_COPYDATA

问题 I am trying to write a class library that can catch the windows messages to notify me if a device has been attached or removed. Normally, in a windows forms app I would just override the WndProc method but there is not WndProc method in this case. Is there another way I can get the messages? 回答1: You'll need a window, there's no way around that. Here's a sample implementation. Implement an event handler for the DeviceChangeNotifier.DeviceNotify event to get notifications. Call the

问题 I am trying to write a class library that can catch the windows messages to notify me if a device has been attached or removed. Normally, in a windows forms app I would just override the WndProc method but there is not WndProc method in this case. Is there another way I can get the messages? 回答1: You'll need a window, there's no way around that. Here's a sample implementation. Implement an event handler for the DeviceChangeNotifier.DeviceNotify event to get notifications. Call the

问题 How can I override WndProc in WPF? When my window close, I try to check if the file i'm using was modified, if so, I have to promt the user for "Do you want to save changes?" message, then close the file being used and the window.However, I cannot handle the case when user restarts/shutdown/logoff when my window is still open.I cannot override WndProc since I am developing using WPF.I have also tried using this sample MSDN code.This is what I did private void loadedForm(object sender,