C# Win32 API ウィンドウの関数の使用

宣言

//API
#region API
 
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll")]
private static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int length);
[DllImport("user32.dll")]
public static extern bool OpenIcon(IntPtr hWnd);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
private static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
 
private const int WM_LBUTTONDOWN = 0x0201;
private const int WM_LBUTTONUP = 0x0202;
private const int MK_LBUTTON = 0x0001;
 
////EnumChildWindows
#region EnumChildWindows
 
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private extern static bool EnumChildWindows(IntPtr hWnd, EnumWindowsDelegate lpEnumFunc, IntPtr lparam);
 
private delegate bool EnumWindowsDelegate(IntPtr hWnd, IntPtr lparam);
 
static List<IntPtr> childList;
 
static private List<IntPtr> GetChildWindows(IntPtr hwnd)
{
    childList = new List<IntPtr>();
    EnumChildWindows(hwnd, new EnumWindowsDelegate(EnumWindowCallBack), IntPtr.Zero);
    return childList;
}
 
private static bool EnumWindowCallBack(IntPtr hWnd, IntPtr lparam)
{
    childList.Add(hWnd);
    return true;
}
#endregion EnumChildWindows ----- END ----
 
#endregion API ----- END -----

子ウィンドウのハンドルリストの取得する

List<IntPtr> list = GetChildWindows((IntPtr)tmpInt);

プログラム名からハンドルを取得する

IntPtr hWnd = FindWindow(null, "Google - Mozilla Firefox");
if (hWnd == IntPtr.Zero) throw new Exception("Error");