IntPtr _result = SendMessage(tailHandle, APMApiPublic.WM_COPYDATA, (IntPtr)index, sendData);

using System.Runtime.InteropServices;

class UAPDBMQ0010 : Form
{
IntPtr tailHandle = IntPtr.Zero;
System.Timers.Timer tm = new System.Timers.Timer();
string qryText = "";

[DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern IntPtr FindWindow(string strClassName, string strWindowName);
        [DllImport("user32.dll")]
        public static extern int SendMessage(int hWnd, uint Msg, int wParam, int lParam);

public UAPDBMQ0010(IntPtr prmHandle, string qryFileName)
{
tailHandle = prmHandle;

tm.Elapsed += new ElapsedEventHandler(____time_tick);
qryText = System.IO.File.ReadAllText(qryFileName);
}
void ____time_tick(object sender, ElapsedEventArgs e)
{
try
                {
                    byte[] dataByte = Encoding.UTF8.GetBytes(qryText);

                    COPYDATASTRUCT copyData = new COPYDATASTRUCT();
                    copyData.dwData = (IntPtr)0;
            copyData.cbData = dataByte.Length;
                    copyData.lpData = Marshal.AllocHGlobal(dataByte.Length);
                    Marshal.Copy(dataByte, 0, copyData.lpData, dataByte.Length);

                    IntPtr sendData = Marshal.AllocHGlobal(Marshal.SizeOf(copyData));
                    Marshal.StructureToPtr(copyData, sendData, true);

                    IntPtr _result = SendMessage(tailHandle, APMApiPublic.WM_COPYDATA, (IntPtr)index, sendData);

                    Marshal.FreeHGlobal(copyData.lpData);
                    Marshal.FreeHGlobal(sendData);
                }
                catch (Exception exp)
                {
                    Console.WriteLine(exp.Message);
                }
}
}

class APMCommManage : Form
{
IntPtr currentHandle = IntPtr.Zero;

public APMCommManage()
        {
            currentHandle = Handle;
        }
protected override void WndProc(ref Message m)
{
const int WM_PAINT=0x000f;

base.WndProc(ref m);

switch(m.Msg)
{
case WM_PAINT:
break;
default:
break;
}
}
protected override bool ProcessCmdKey(ref Message m, Keys keyData)
{
const int WM_KEYDOWN=0x0100;

if(m.Msg==WM_KEYDOWN)
{
switch(keyData.ToString())
{
case "Return":
Console.WriteLine("HANDLE:" + "[" + currentHandle.ToString() + "]");
break;
case "Right":
break;
case "Left":
break;
case "Space":
DBMS2022FRM dbms2022frm  = new DBMS2022FRM(currentHandle, "QUERY.567342.001");
dbms2022frm.Show();
break;
case "Escape":
Application.Exit();
break;
default:
break;
}
}
return base.ProcessCmdKey(ref m, keyData);
}
}