SendKeys.Send instead SendKeys.SendWait

M Riaz Bashir

Hi, I am trying to send some text to notepad using SendKeys.Send("Hello World!") instead SendKeys.SendWait("Hello World!"). But I could not send and facing problem. Error is: "SendKeys cannot run inside this application because the application is not handling Windows messages. Either change the application to handle messages, or use the SendKeys.SendWait method." Thank you

namespace Send_Key
{
class Program
{
[DllImport("user32.dll", SetLastError = true, EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", SetLastError = true, EntryPoint = "SetForegroundWindow")]
static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll", SetLastError = true, EntryPoint = "ShowWindow")]
static extern bool ShowWindow(IntPtr hWnd, int cmCommand);
static IntPtr hwnd;

    static void Main(string\[\] args)
    {
        Process notePad = new Process();
        notePad.StartInfo.FileName = "notepad.exe";
        notePad.Start();

        System.Threading.Thread.Sleep(1000);

        SetForegroundWindow(hWnd);

        System.Threading.Thread.Sleep(1000);
        SendKeys.Send("Hello World!");
    }
}

}

BillWoodruff

You are not setting NotePad as the ForegroundWindow correctly. Try:

SetForegroundWindow(notePad.MainWindowHandle);

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Dave Kreskowiak

Your Thread.Sleep lines can be removed. You don't need them. Also, the numbers you have in there are just arbitrary and make certain assumptions about the performance if the system. A better way to wait for Notepad to launch is:

notePad.WaitForInputIdle();

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