Question

我在Winforms窗口中托管了一个win32控件。我想处理这个控件的消息，所以我可以选择忽略某些消息。 win32控件是一个ListView控件。

有办法做到这一点吗？

Answer 1

您可以在Form类

中覆盖方法WndProc

public class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    protected override void WndProc(ref Message m)
    {
         // use the 'm' struct
    }

}

详细示例可用here

using System;
using System.Drawing;
using System.Windows.Forms;

namespace csTempWindowsApplication1
{
    public class Form1 : System.Windows.Forms.Form
    {
        // Constant value was found in the "windows.h" header file.
        private const int WM_ACTIVATEAPP = 0x001C;
        private bool appActive = true;

        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        public Form1()
        {
            this.Size = new System.Drawing.Size(300,300);
            this.Text = "Form1";
            this.Font = new System.Drawing.Font("Microsoft Sans Serif", 18F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
        }

        protected override void OnPaint(PaintEventArgs e) 
        {
            // Paint a string in different styles depending on whether the 
            // application is active. 
            if (appActive) 
            {
                e.Graphics.FillRectangle(SystemBrushes.ActiveCaption,20,20,260,50);
                e.Graphics.DrawString("Application is active", this.Font, SystemBrushes.ActiveCaptionText, 20,20);
            }
            else 
            {
                e.Graphics.FillRectangle(SystemBrushes.InactiveCaption,20,20,260,50);
                e.Graphics.DrawString("Application is Inactive", this.Font, SystemBrushes.ActiveCaptionText, 20,20);
            }
        }

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name="FullTrust")]
        protected override void WndProc(ref Message m) 
        {
            // Listen for operating system messages. 
            switch (m.Msg)
            {
                // The WM_ACTIVATEAPP message occurs when the application 
                // becomes the active application or becomes inactive. 
                case WM_ACTIVATEAPP:

                    // The WParam value identifies what is occurring.
                    appActive = (((int)m.WParam != 0));

                    // Invalidate to get new text painted. 
                    this.Invalidate();

                    break;                
            }
            base.WndProc(ref m);
        }
    }
}

如何在Winforms中处理win32控件的消息？

1 个答案: