Question

I have starter new System.Diagnostics.Process and it launchs FireFox. How can I obtain the Handler of that window? Any ideas – C#, winAPI functions… anything (just not ASM 😉 )

Answer 1

Once you started the process, you can call process.Refresh() and the process.MainWindowHandle property will eventually contain the native windows handle of the application’s main window.

You might have to wait a little bit after you started the process for it to get populated.

Here is some code:

Process process = new Process();
// Fill process.StartInfo
process.Start();

do
{
    System.Threading.Sleep(100);
    process.Refresh();
}
while(process.MainWindowHandle == IntPtr.Zero && !process.HasExited);

if(!process.HasExited)
{
    IntPtr hwnd = process.MainWindowHandle;
    // Do whatever you need to do with hwnd
}