C# execute on command prompt running geth
Question
I have a listener service where I can send a command to it, but with this service, it's unable to send a command to a command prompt running ethereuem's geth. Is there a way to forcibly get the keyboard strokes through?
I notice that I have other code that can find a command prompt by name or id and able to bring that window to the front, but when I attempt to do that with the command prompt that is running geth, it can't seem to bring that window to the front. I hope that bit of information may help.
namespace Listener
{
class Program
{
static void Main(string[] args)
{
using (var listener = new HttpListener())
{
listener.Prefixes.Add("http://localhost:8081/mytest/");
listener.Start();
string command = string.Empty;
for (; ; )
{
Console.WriteLine("Listening...");
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
// TODO: read and parse the JSON data from 'request.InputStream'
using (StreamReader reader = new StreamReader(request.InputStream))
{
// Would prefer string[] result = reader.ReadAllLines();
string[] result = reader.ReadToEnd().Split(Environment.NewLine.ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
foreach (var s in result)
{
command = s;
}
}
// send command to other geth window
sendKeystroke(command);
using (HttpListenerResponse response = context.Response)
{
// returning some test results
// TODO: return the results in JSON format
string responseString = "<HTML><BODY>Hello, world!</BODY></HTML>";
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseString);
response.ContentLength64 = buffer.Length;
using (var output = response.OutputStream)
{
output.Write(buffer, 0, buffer.Length);
}
}
}
}
}
[DllImport("user32.dll")]
static extern bool SetForegroundWindow(IntPtr hWnd);
private static void sendToOpenCmd(string command)
{
int processId = 13420;
//processId = int.Parse(13420);
System.Diagnostics.Process proc = (from n in System.Diagnostics.Process.GetProcesses()
where n.ProcessName == "geth"
//where n.Id == processId
select n).FirstOrDefault();
if (proc == null)
{
//MessageBox.Show("No such process.");
Console.WriteLine("No such process.");
}
else
{
SetForegroundWindow(proc.MainWindowHandle);
SendKeys.SendWait(command + "{enter}");
Console.WriteLine("Sent! " + command + " " + DateTime.Now.ToString());
}
}
[DllImport("user32.dll")]
public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern IntPtr PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
public static void sendKeystroke(string command)
{
const uint WM_KEYDOWN = 0x100;
const uint WM_SYSCOMMAND = 0x018;
const uint SC_CLOSE = 0x053;
IntPtr WindowToFind = FindWindow(null, "geth");
//ushort[] result = command.Where(i => ushort.TryParse(i, out short s)).Select(ushort.Parse);
//ushort[] result = command.Where(i => { ushort r = 0; return ushort.TryParse(i, out r); }).Select(ushort.Parse);
ushort result;
ushort.TryParse(command, out result);
IntPtr result3 = SendMessage(WindowToFind, WM_KEYDOWN, ((IntPtr)result), (IntPtr)0);
//IntPtr result3 = SendMessage(WindowToFind, WM_KEYUP, ((IntPtr)c), (IntPtr)0);
}
}
}
1 answers
solution1
0 2018-09-30 17:57:34
ohhh there seems to be three process id's that windows has on that command prompt running geth. i'm not sure why there's three. i tried all three, and one of them worked for me. so i can't call the process by name of "geth", that doesn't seem to be the correct window or process to send the keystrokes to. hopefully this helps someone else!
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