const int WM_COPYDATA = 0x004A;
[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(
int hWnd, // handle to destination window
int Msg, // message
int wParam, // first message parameter
ref COPYDATASTRUCT lParam // second message parameter
);
[DllImport("User32.dll", EntryPoint = "FindWindow")]
private static extern int FindWindow(string lpClassName, string
lpWindowName);
private void button1_Click(object sender, EventArgs e)
{
int WINDOW_HANDLER = FindWindow(null, "指南針優化軟件");
if (WINDOW_HANDLER == 0)
{
Process p = new Process();
p.StartInfo.FileName = Application.StartupPath + "\\..\\ZNZ.exe";
p.Start();
Application.Exit();
}
else
{
byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
int len = sarr.Length;
COPYDATASTRUCT cds;
cds.dwData = (IntPtr)100;
cds.lpData = this.textBox1.Text;
cds.cbData = len + 1;
SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);
}
}
public struct COPYDATASTRUCT
{
public IntPtr dwData;//用戶定義數據
public int cbData;//數據大小
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;//指向數據的指針
}