WinForm中使用Win32API发送自定义消息

最新推荐文章于 2023-08-17 13:26:47 发布

原创最新推荐文章于 2023-08-17 13:26:47 发布 · 319 阅读

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#runtime

本文介绍了一个使用Windows消息机制实现的跨进程通信案例。通过注册窗口消息并在不同应用程序间发送消息来触发特定事件，实现了AppA与AppB之间的简单交互。

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I let AppA's Button1 to invoke the Button1_click event in AppB
In AppB I wrote:
private string msgstr = "interprocess communication";
private uint msg;
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern uint RegisterWindowMessage(string lpString);
private void Form1_Load(object sender, System.EventArgs e)
{
msg = RegisterWindowMessage(msgstr);
if (msg == 0)
{
MessageBox.Show(Marshal.GetLastWin32Error().ToString());
}
}
private void button1_Click(object sender, System.EventArgs e)
{
MessageBox.Show("AppB's button is clicked");
}
protected override void WndProc(ref Message m)
{
if (m.Msg == msg)
{
//MessageBox.Show(msgstr + " from wndproc");
button1.PerformClick();
}
base.WndProc(ref m);
}
And in AppA I wrote:
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool PostMessage(int hhwnd, uint msg, IntPtr wparam,
IntPtr lparam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
static extern uint RegisterWindowMessage(string lpString);

private string msgstr = "interprocess communication";
private uint msg;
private const int HWND_BROADCAST = 0xffff;
private void button1_Click(object sender, System.EventArgs e)
{
msg = RegisterWindowMessage(msgstr);
if (msg == 0)
{
MessageBox.Show(Marshal.GetLastWin32Error().ToString());
}
PostMessage(HWND_BROADCAST, msg, IntPtr.Zero, IntPtr.Zero);
}
PS. Both should using System.Runtime.InteropServices;if PostMessage doesn't work you can try SendMessage