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Use EnumWindows instead of FindWindow

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This commit is contained in:
Yaakov 2020-05-21 17:51:59 +10:00
parent e512889b17
commit 1a934be05f
2 changed files with 61 additions and 12 deletions
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9
Notepad.Extensions.Logging/NativeMethods.cs
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@ -1,5 +1,6 @@
using System; using System;
using System.Runtime.InteropServices; using System.Runtime.InteropServices;
using System.Text;
namespace Microsoft.Extensions.Logging namespace Microsoft.Extensions.Logging
{ {
@ -15,5 +16,13 @@ namespace Microsoft.Extensions.Logging
[DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)] [DllImport("User32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam); public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);
public delegate bool EnumWindowsDelegate(IntPtr hWnd, IntPtr lParam);
[DllImport("user32.dll")]
public static extern bool EnumWindows(EnumWindowsDelegate lpEnumFunc, IntPtr lParam);
[DllImport("User32.dll")]
public static extern int GetWindowText(IntPtr hWndParent, StringBuilder sb, int maxCount);
} }
} }

64
Notepad.Extensions.Logging/WindowFinder.cs
View file

@ -1,4 +1,6 @@
using System; using System;
using System.ComponentModel;
using System.Text;
namespace Microsoft.Extensions.Logging namespace Microsoft.Extensions.Logging
{ {
@ -6,28 +8,66 @@ namespace Microsoft.Extensions.Logging
{ {
public static IntPtr FindNotepadWindow() public static IntPtr FindNotepadWindow()
{ {
var hwnd = FindMainWindow(); sb ??= new StringBuilder(4096);
IntPtr edit = NativeMethods.FindWindowEx(hwnd, IntPtr.Zero, "EDIT", null);
try
{
FindMainWindow();
if (handle == IntPtr.Zero)
{
return handle;
}
IntPtr edit = NativeMethods.FindWindowEx(handle, IntPtr.Zero, "EDIT", null);
return edit; return edit;
} }
finally
{
handle = IntPtr.Zero;
sb.Clear();
}
}
static IntPtr FindMainWindow() static IntPtr FindMainWindow()
{ {
IntPtr hwnd; NativeMethods.EnumWindows(enumWindowsDelegate, IntPtr.Zero);
return handle;
hwnd = NativeMethods.FindWindow(null, "Untitled - Notepad");
if (hwnd != IntPtr.Zero)
{
return hwnd;
} }
hwnd = NativeMethods.FindWindow(null, "*Untitled - Notepad"); static NativeMethods.EnumWindowsDelegate enumWindowsDelegate = new NativeMethods.EnumWindowsDelegate(EnumWindowsCallback);
if (hwnd != IntPtr.Zero)
static bool EnumWindowsCallback(IntPtr hWnd, IntPtr lParam)
{ {
return hwnd; var result = NativeMethods.GetWindowText(hWnd, sb, sb.Capacity);
if (result < 0)
{
throw new Win32Exception(result);
} }
return IntPtr.Zero; if (IsKnownNotepadWindow(sb.ToString()))
{
WindowFinder.handle = hWnd;
return false;
}
return true;
}
[ThreadStatic]
static IntPtr handle;
[ThreadStatic]
static StringBuilder sb;
static bool IsKnownNotepadWindow(string titleText)
{
switch (titleText)
{
case "Untitled - Notepad":
case "*Untitled - Notepad":
return true;
}
return false;
} }
} }
} }