2023-0404

C#进程间通信

作者: momy 分类: 编程开发 0 Comment »
摘要：C#进程间通信实例

消息发送方

一、引入系统方法SendMessage

private const int WM_COPYDATA = 0x004A;//这个不要随意更改，否则可能造成读取数据报错
[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, ref COPYDATASTRUCT lParam);


二、声明数据传输结构体

public struct COPYDATASTRUCT
{
    public IntPtr dwData;
    public int cbData;
    [MarshalAs(UnmanagedType.LPStr)]
    public string lpData;
}


三、消息发送

Process? process = Process.GetProcessesByName("WinFormsApp2").FirstOrDefault();
if (process == null)
{
    MessageBox.Show("指定进程未找到");
    return;
}
string message = "0012001256";
COPYDATASTRUCT cds;
cds.dwData = (IntPtr)Convert.ToInt16(1);//可以是任意值
cds.cbData = bytes.Length + 1;//指定lpData内存区域的字节数
cds.lpData = message;//发送给目标窗口所在进程的数据
SendMessage(process.MainWindowHandle, WM_COPYDATA, 0, ref cds);


消息接收方，进程名称“WinFormsApp2”


public partial class Form1 : Form
{
    private const int WM_COPYDATA = 0x004A;//这个不要随意更改，否则可能造成读取数据报错
    public Form1()
    {
        InitializeComponent();
    }
    protected override void DefWndProc(ref Message m)
    {
        switch (m.Msg)
        {
            case WM_COPYDATA:
                COPYDATASTRUCT cds = new COPYDATASTRUCT();
                cds = (COPYDATASTRUCT)m.GetLParam(typeof(COPYDATASTRUCT));
                string result = cds.lpData;
                MessageBox.Show($"收到消息：{result}");
                break;
            default:
                base.DefWndProc(ref m);
                break;
        }
    }
}
public struct COPYDATASTRUCT
{
    public IntPtr dwData;
    public int cbData;
    [MarshalAs(UnmanagedType.LPStr)]
    public string lpData;
}


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