c# – WinForms相当于WPF WindowInteropHelper,HwndSource,HwndSourceHook

我有一块代码,如：

IntPtr hWnd = new WindowInteropHelper(this).Handle;
HwndSource source = HwndSource.FromHwnd(hWnd);
source.AddHook(new HwndSourceHook(WndProc));
NativeMethods.PostMessage((IntPtr)NativeMethods.HWND_BROADCAST, NativeMethods.WM_CALL, IntPtr.Zero, IntPtr.Zero);

这最初是在WPF应用程序中.但是,我需要在WinForms应用程序中复制功能.另外,NativeMethods.PostMessage只是映射到user32.dll PostMessage：

[DllImport("user32")]
public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);

我可以在WinForms应用程序中使用1到1当量的WindowInteropHelper / HwndSource / HwndSourceHook吗？

解决方法:

基本点是：除了源中的AddHook之外,您不需要任何其他内容.每个WinForm都有一个方法GetHandle(),它将为您提供Window / Form的句柄(并且您已经自己找到了PostMessage).

要翻译AddHook你要编写自己的类实现IMessageFilter(1),要么覆盖WndProc()(2).
(1)将在应用程序范围内接收消息,无论您发送哪种形式,(2)仅接收覆盖该方法的特定表单的消息.

我无法找到关于WM_CALL的任何内容,因为您必须将窗口消息指定为整数(通常为十六进制),因此这取决于您.

(1)：

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public partial class Form1 : Form
{
    [DllImport("user32")]
    public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);

    //private const int WM_xxx = 0x0;
    //you have to know for which event you wanna register

    public Form1()
    {
        InitializeComponent();

        IntPtr hWnd = this.Handle;
        Application.AddMessageFilter(new MyMessageFilter());
        PostMessage(hWnd, WM_xxx, IntPtr.Zero, IntPtr.Zero);
    }        
}

class MyMessageFilter : IMessageFilter
{
    //private const int WM_xxx = 0x0;

    public bool PreFilterMessage(ref Message m)
    {
        if (m.Msg == WM_xxx)
        {
            //code to handle the message
        }
        return false;
    }
}

(2)：

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public partial class Form 1 {
    [DllImport("user32")]
    public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);

    //private const int WM_xxx = 0x0;
    //you have to know for which event you wanna register

    public Form1()
    {
        InitializeComponent();

        IntPtr hWnd = this.Handle;
        PostMessage(hWnd, WM_xxx, IntPtr.Zero, IntPtr.Zero);
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WMK_xxx)
        {
            //code to handle the message
        }
    }
}

标签：c,net,winforms,native,user32
来源： https://codeday.me/bug/20190529/1175962.html