How to get process name and title of the top window on Windows / C#
As in the topic... or better - how to get this in开发者_高级运维formation from events when the top window changes?
Thanks for hints. So I should use P/Invoke anyhow. Here is the complete code:
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
namespace CuckooCoach
{
class Monitor
{
[DllImport("user32.dll")]
private static extern IntPtr GetForegroundWindow();
[DllImport("user32.dll")]
static extern int GetWindowTextLength(IntPtr hWnd);
// int GetWindowText(
// __in HWND hWnd,
// __out LPTSTR lpString,
// __in int nMaxCount
// );
[DllImport("user32.dll")]
private static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount);
// DWORD GetWindowThreadProcessId(
// __in HWND hWnd,
// __out LPDWORD lpdwProcessId
// );
[DllImport("user32.dll")]
private static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
//HANDLE WINAPI OpenProcess(
// __in DWORD dwDesiredAccess,
// __in BOOL bInheritHandle,
// __in DWORD dwProcessId
//);
[DllImport("kernel32.dll")]
private static extern IntPtr OpenProcess(uint dwDesiredAccess, bool bInheritHandle, uint dwProcessId);
[DllImport("kernel32.dll")]
private static extern bool CloseHandle(IntPtr handle);
// DWORD WINAPI GetModuleBaseName(
// __in HANDLE hProcess,
// __in_opt HMODULE hModule,
// __out LPTSTR lpBaseName,
// __in DWORD nSize
// );
[DllImport("psapi.dll")]
private static extern uint GetModuleBaseName(IntPtr hWnd, IntPtr hModule, StringBuilder lpFileName, int nSize);
// DWORD WINAPI GetModuleFileNameEx(
// __in HANDLE hProcess,
// __in_opt HMODULE hModule,
// __out LPTSTR lpFilename,
// __in DWORD nSize
// );
[DllImport("psapi.dll")]
private static extern uint GetModuleFileNameEx(IntPtr hWnd, IntPtr hModule, StringBuilder lpFileName, int nSize);
public static string GetTopWindowText()
{
IntPtr hWnd = GetForegroundWindow();
int length = GetWindowTextLength(hWnd);
StringBuilder text = new StringBuilder(length + 1);
GetWindowText(hWnd, text, text.Capacity);
return text.ToString();
}
public static string GetTopWindowName()
{
IntPtr hWnd = GetForegroundWindow();
uint lpdwProcessId;
GetWindowThreadProcessId(hWnd, out lpdwProcessId);
IntPtr hProcess = OpenProcess(0x0410, false, lpdwProcessId);
StringBuilder text = new StringBuilder(1000);
//GetModuleBaseName(hProcess, IntPtr.Zero, text, text.Capacity);
GetModuleFileNameEx(hProcess, IntPtr.Zero, text, text.Capacity);
CloseHandle(hProcess);
return text.ToString();
}
}
}
You can find window handle by process name using this code:
Process[] processes = Process.GetProcessesByName(m.ProcessName);
if (processes != null && processes.Length > 0)
{
Process process = processes[0];
process.StartInfo.WindowStyle = ProcessWindowStyle.Normal;
process.Refresh();
if (process.MainWindowHandle != IntPtr.Zero)
{ // process.mainwindows handle is needed for you
and than you can find window text by handle title = GetWindowTitle(process.MainWindowHandle);
private String GetWindowTitle(IntPtr hWn)
{
object LParam = new object();
int WParam = 0;
StringBuilder title = new StringBuilder(1024);
SendMessage(hWn, WM_GETTEXT, WParam, LParam);
GetWindowText(hWn, title, title.Capacity);
return title.ToString();
}
You need following declarations to call winapi functions:
[DllImport("user32", CharSet = CharSet.Auto, SetLastError = true)]
internal static extern int GetWindowText(IntPtr hWnd, [Out, MarshalAs(UnmanagedType.LPTStr)] StringBuilder lpString, int nMaxCount);
[DllImport("User32.dll", EntryPoint = "SendMessage")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, object lParam);
I don't think there is a .Net way of doing this, so I think you will have use PInvoke.
Here's some sample code http://www.pinvoke.net/default.aspx/user32.getforegroundwindow
And as can be seen in that link there's a project (Managed Windows API) that wraps that up in managed code if you don't want to deal with the PInvoke code yourself.
For the window title, you'll have to do a P/Invoke of GetWindowText with the HWND returned from GetForegroundWindow().
As for the process info, I believe that P/Invoking GetWindowModuleFileName should work.
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