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using System;
using System.ComponentModel;
using System.IO;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
namespace IPA.Logging
{
// https://stackoverflow.com/a/48864902/3117125
internal static class WinConsole
{
internal static TextWriter ConOut;
internal static TextReader ConIn;
private static SafeFileHandle outHandle;
private static SafeFileHandle inHandle;
public static bool UseVTEscapes { get; private set; } = true;
internal static IntPtr OutHandle => outHandle.DangerousGetHandle();
internal static IntPtr InHandle => inHandle.DangerousGetHandle();
internal static bool IsInitialized;
public static void Initialize(bool alwaysCreateNewConsole = true)
{
bool consoleAttached = true;
if (alwaysCreateNewConsole
|| (AttachConsole(AttachParent) == 0
&& Marshal.GetLastWin32Error() != ErrorAccessDenied))
{
consoleAttached = AllocConsole() != 0;
}
if (consoleAttached)
{
InitializeStreams();
IsInitialized = true;
}
}
public static void InitializeStreams()
{
InitializeOutStream();
InitializeInStream();
}
private static void InitializeOutStream()
{
var fs = CreateFileStream("CONOUT$", GenericWrite, FileShareWrite, FileAccess.Write, out outHandle);
if (fs != null)
{
var writer = new StreamWriter(fs) { AutoFlush = true };
ConOut = writer;
Console.SetOut(writer);
Console.SetError(writer);
var handle = GetStdHandle(-11); // get stdout handle (should be CONOUT$ at this point)
if (GetConsoleMode(handle, out var mode))
{
mode |= EnableVTProcessing;
if (!SetConsoleMode(handle, mode))
{
UseVTEscapes = false;
Console.Error.WriteLine("Could not enable VT100 escape code processing (maybe you're running an old Windows?): " +
new Win32Exception(Marshal.GetLastWin32Error()).Message);
}
}
else
{
UseVTEscapes = false;
Console.Error.WriteLine("Could not enable VT100 escape code processing (maybe you're running an old Windows?): " +
new Win32Exception(Marshal.GetLastWin32Error()).Message);
}
}
}
private static void InitializeInStream()
{
var fs = CreateFileStream("CONIN$", GenericRead, FileShareRead, FileAccess.Read, out inHandle);
if (fs != null)
{
Console.SetIn(ConIn = new StreamReader(fs));
}
}
private static FileStream CreateFileStream(string name, uint win32DesiredAccess, uint win32ShareMode,
FileAccess dotNetFileAccess, out SafeFileHandle handle)
{
var file = new SafeFileHandle(CreateFileW(name, win32DesiredAccess, win32ShareMode, IntPtr.Zero, OpenExisting, FileAttributeNormal, IntPtr.Zero), true);
if (!file.IsInvalid)
{
handle = file;
var fs = new FileStream(file, dotNetFileAccess);
return fs;
}
handle = null;
return null;
}
#region Win API Functions and Constants
[DllImport("kernel32.dll",
EntryPoint = "AllocConsole",
SetLastError = true,
CharSet = CharSet.Auto,
CallingConvention = CallingConvention.StdCall)]
private static extern int AllocConsole();
[DllImport("kernel32.dll",
EntryPoint = "AttachConsole",
SetLastError = true,
CharSet = CharSet.Auto,
CallingConvention = CallingConvention.StdCall)]
private static extern uint AttachConsole(uint dwProcessId);
[DllImport("kernel32.dll",
EntryPoint = "CreateFileW",
SetLastError = true,
CharSet = CharSet.Unicode,
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr CreateFileW(
string lpFileName,
uint dwDesiredAccess,
uint dwShareMode,
IntPtr lpSecurityAttributes,
uint dwCreationDisposition,
uint dwFlagsAndAttributes,
IntPtr hTemplateFile
);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool GetConsoleMode(IntPtr hConsoleHandle, out uint lpMode);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool SetConsoleMode(IntPtr hConsoleHandle, uint dwMode);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetStdHandle(int nStdHandle);
private const uint EnableVTProcessing = 0x0004;
private const uint GenericWrite = 0x40000000;
private const uint GenericRead = 0x80000000;
private const uint FileShareRead = 0x00000001;
private const uint FileShareWrite = 0x00000002;
private const uint OpenExisting = 0x00000003;
private const uint FileAttributeNormal = 0x80;
private const uint ErrorAccessDenied = 5;
private const uint AttachParent = 0xFFFFFFFF;
#endregion
}
}