wm-paint | 易学教程

OpenGL4Net WM_PAINT does not exist?

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问题 I'm trying to get OpenGL4Net working with C# in Microsoft Visual Studio Comunity 2015. I've downloaded this file: https://sourceforge.net/projects/ogl4net/files/Rev.%2037/x64/ And followed these instructions: https://sourceforge.net/p/ogl4net/wiki/Tutorials/ At first with a console application but then starting again with a Windows Form application as it seems as if it was going to be using the window from that as opposed to making its own. So far the various refrances have been added, form1

Handling WM_PAINT in a Subclassed CStatic Control

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问题 I created a custom control whose class has CStatic as base class. Currently I handle the drawing using WM_PAINT event. But there is a strange behavior. When I re-enable the window after disabling it using CWnd::EnableWindow function, it refuses to draw what I written in OnPaint function. It draws the static control instead. I agree that there is this standard method of overriding DrawItem and using SS_OWNERDRAW style. But what's wrong with WM_PAINT ? void XXControl::OnPaint() { CPaintDC

why not to send WM_PAINT manually

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问题 I have read that I should never send WM_PAINT manually and should call InvalidateRect instead but didn't found anything about why not, however. So why not? update works with InvalidateRect but not with SendMessage(WM_PAINT) LRESULT CALLBACK window_proc(HWND wnd, UINT msg, WPARAM w_param, LPARAM l_param) { switch (msg) { case WM_PAINT: PAINTSTRUCT ps; HDC hdc = BeginPaint(wnd, &ps); Polyline(..); EndPaint(wnd, &ps); return 0; case WM_USER: // SendMessage(wnd, WM_PAINT, NULL, NULL); //

Winforms Flickering While Drawing Image on Taskbar

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问题 Right now I'm drawing a small 16x16 image on the title bar of my window. It works nicely, except for an obnoxious flicker that I cant figure out how to get rid of. I'm simply drawing the image like this: Protected Overrides Sub WndProc(ByRef m As Message) If m.Msg = WM_SIZE Then wnd_size = New Size(New Point(CInt(m.LParam))) End If If m.Msg = WM_ACTIVATE _ OrElse m.Msg = WM_SIZE _ OrElse m.Msg = WM_SYNCPAINT _ OrElse m.Msg = WM_NCACTIVATE _ OrElse m.Msg = WM_NCCREATE _ OrElse m.Msg = WM

How to control the painting of the player

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问题 I am trying to draw something on a live video. The best way to do that in my opinion is to handle the WM_PIANT event. My purpose is to make the player draw first and after that the application. That way I will be able to draw on the video. It means that I want to be notified each time before we need to paint a new frame on the window and then handle the event. I use DirectshowNet so I am programming in C# (I have all the interfaces the c++'s API has). I understand that the graph manager

TextBox drawn in WM_PAINT flickers on mouse enter/leave

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问题 I have a custom TextBox in which I draw some place holder text when it's empty. It works pretty well, but it flickers when the mouse enters and leaves the TextBox. It seems related to the border becoming blue when the mouse hovers the control (I'm on Windows 8.1). Any idea how I could fix this ? I've tried various SetStyles flags without success. class MyTextBox : TextBox { public string PlaceHolder { get; set; } static readonly Brush sPlaceHolderBrush = new SolidBrush(Color.FromArgb(70, 70,

SetWindowsHookEx in C#

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I'm trying to hook a 3rd party app so that I can draw to its screen. Drawing to the screen is easy, and I need no help with it, but I seem to be having issues with using SetWindowsHookEx to handle WH_GETMESSAGE . I can't figure out what to pass for the last two parameters. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowDrawer { public partial class Form1 : Form { private delegate int HookProc(int code, IntPtr wParam, IntPtr lParam); static

SetWindowsHookEx in C#

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问题 I\'m trying to hook a 3rd party app so that I can draw to its screen. Drawing to the screen is easy, and I need no help with it, but I seem to be having issues with using SetWindowsHookEx to handle WH_GETMESSAGE . I can\'t figure out what to pass for the last two parameters. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowDrawer { public