"Gabriel Lozano-Morán" <gl*****@no-spam.org> wrote in message
news:eC****************@TK2MSFTNGP09.phx.gbl...
This is what I have tried and the focus is set correctly to the calculator
1 using System;
2 using System.Runtime.InteropServices;
3
4 namespace ConsoleApplication3
5 {
6 class Class1
7 {
8 [STAThread]
9 static void Main(string[] args)
10 {
11 System.Diagnostics.Process myProcess = new
System.Diagnostics.Process();
12 myProcess.StartInfo.FileName = "calc";
13 myProcess.Start();
14 IntPtr hWnd = myProcess.Handle;
15 SetFocus(new HandleRef(null, hWnd));
16 }
17
18 [DllImport("user32.dll", CharSet=CharSet.Auto,
ExactSpelling=true)]
19 public static extern IntPtr SetFocus(HandleRef hWnd);
20 }
21 }
Gabriel
Sorry, but this won't work for tree reasons:
1. The process Handle is not a Windows Handle (HWND), what you need is the
MainWindowHandle .
2. You have to wait for the process to start before you can get at it's main
window handle.
3. You can't set the focus using SetFocus() if the HWND is not attached to
calling thread's message queue.
Check the return value of your Win32 API call (using MainWindowHandle as
Handle), you'll see that it fails (PS you should always check API return
values!).
Anyway, you need to call SetForegroundWindow API to set the focus to the
receiving HWND and activate it's thread.
Here is your modified sample...
using System;
using System.Runtime.InteropServices;
namespace ConsoleApplication3
{
class Class1
{
[STAThread]
static void Main(string[] args)
{
System.Diagnostics.Process myProcess = new
System.Diagnostics.Process();
myProcess.StartInfo.FileName = "calc";
myProcess.Start();
myProcess.WaitForInputIdle(2000);
IntPtr hWnd = myProcess.MainWindowHandle;
Console.WriteLine(hWnd);
bool p = SetForegroundWindow(hWnd);
if(!p)
Console.WriteLine("Could not set focus");
}
[DllImport("user32.dll", CharSet=CharSet.Auto,SetLastError=true)]
public static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll", CharSet=CharSet.Auto,SetLastError=true)]
public static extern IntPtr SetFocus(IntPtr hWnd);
}
}
Willy.
