I'm trying to get the name of the executable of a window that is outside my C# 2.0 application. My app currently gets a window handle (hWnd) using the GetForegroundWindow() call from "user32.dll".
From the digging that I've been able to do, I think I want to use the GetModuleFileNameEx() function (from PSAPI) to obtain the name, but GetModuleFileNameEx() requires a handle to a Process, not a Window.
Is it possible to get a process handle from a window handle? (Do I need to get the thread handle of the window first?)
EDITED the first sentence to make it clearer what I'm trying to do.
UPDATE! Here's the C# code that I found worked for me. The only caveat is occasionally it returns a file/path where the drive letter is a "?" instead of the actual drive letter (like "C"). -- Haven't figured out why yet.
[DllImport("user32.dll")]
static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
[DllImport("kernel32.dll")]
static extern IntPtr OpenProcess(UInt32 dwDesiredAccess, Int32 bInheritHandle, UInt32 dwProcessId);
[DllImport("psapi.dll")]
static extern uint GetModuleFileNameEx(IntPtr hProcess, IntPtr hModule, [Out] StringBuilder lpBaseName, [In] [MarshalAs(UnmanagedType.U4)] int nSize);
[DllImport("kernel32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CloseHandle(IntPtr hObject);
private string GetWindowModuleFileName(IntPtr hWnd)
{
uint processId = 0;
const int nChars = 1024;
StringBuilder filename = new StringBuilder(nChars);
GetWindowThreadProcessId(hWnd, out processId);
IntPtr hProcess = OpenProcess(1040, 0, processId);
GetModuleFileNameEx(hProcess,IntPtr.Zero,filename,nChars);
CloseHandle(hProcess);
return (filename.ToString());
}
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