protected override void WndProc(ref Message m)
{
if (m.Msg == NativeMethods.WM_COPYDATA)
{
// Extract the file name
NativeMethods.COPYDATASTRUCT copyData =
(NativeMethods.COPYDATASTRUCT)Marshal.PtrToStructure
(m.LParam, typeof(NativeMethods.COPYDATASTRUCT));
int dataType = (int)copyData.dwData;
if (dataType == 2)
{
string argsString = Marshal.PtrToStringAnsi(copyData.lpData);
string[] args = JsonConvert.DeserializeObject <string[]>(argsString);
if (args.Length > 0)
{
ProcessArguments(args);
}
}
else
{
MessageBox.Show(String.Format("Unrecognized data type = {0}.",
dataType), "CmdQueue Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
else
{
base.WndProc(ref m);
}
}
static void Main(string[] args)
{
PassedArguments = args;
bool isNewInstance;
Mutex mutex = new Mutex(true, "com.gazchap.cmdqueue", out isNewInstance);
if (isNewInstance)
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new frmMain());
mutex.ReleaseMutex();
}
else
{
string windowTitle = "CmdQueue";
// Find the window with the name of the main form
IntPtr ptrWnd = NativeMethods.FindWindow(null, windowTitle);
if (ptrWnd == IntPtr.Zero)
{
MessageBox.Show(String.Format("No window found with the title {0}.", windowTitle),
"CmdQueue Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
IntPtr ptrCopyData = IntPtr.Zero;
try {
string argsString = JsonConvert.SerializeObject(args);
// Create the data structure and fill with data
NativeMethods.COPYDATASTRUCT copyData = new NativeMethods.COPYDATASTRUCT();
copyData.dwData = new IntPtr(2); // Just a number to identify the data type
copyData.cbData = argsString.Length + 1; // One extra byte for the \0 character
copyData.lpData = Marshal.StringToHGlobalAnsi(argsString);
// Allocate memory for the data and copy
ptrCopyData = Marshal.AllocCoTaskMem(Marshal.SizeOf(copyData));
Marshal.StructureToPtr(copyData, ptrCopyData, false);
// Send the message
NativeMethods.SendMessage(ptrWnd, NativeMethods.WM_COPYDATA, IntPtr.Zero, ptrCopyData);
} catch (Exception ex) {
MessageBox.Show(ex.ToString(), "CmdQueue Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
} finally {
// Free the allocated memory after the control has been returned
if (ptrCopyData != IntPtr.Zero)
{
Marshal.FreeCoTaskMem(ptrCopyData);
}
}
}
}
}
