来自 Kernel32 的 WriteConsoleOutput() 不显示文本

Question

我目前正在编写一个小型实用程序库来帮助提高写入控制台时的性能，但我遇到了一个无法实际输出任何文本的问题。下面是我的代码：

public static class QuickDraw
{
    private static short Width => (short)Console.WindowWidth;
    private static short Height => (short)Console.WindowHeight;

    private static SafeFileHandle Handle =>
        Kernel32.CreateFile("$CONOUT", 0x40000000, 2, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero);

    private static Kernel32.Coord Cursor =>
        new Kernel32.Coord((short)Console.CursorLeft, (short)Console.CursorTop);

    private static Kernel32.SmallRect WriteRegion =>
        new Kernel32.SmallRect() { Left = 0, Top = 0, Right = Width, Bottom = Height };
    private static Kernel32.Coord BufferSize =>
        new Kernel32.Coord(Width, Height);
    private static Kernel32.Coord BufferCoord =>
        new Kernel32.Coord(0, 0);

    public static void Write(char[] text, ConsoleColor fg, ConsoleColor bg)
    {
        Kernel32.CharInfo[] buffer = new Kernel32.CharInfo[Width * Height];
        Kernel32.Coord cursor = Cursor;

        for (int i = 0; i < text.Length; i++)
        {
            if (text[i] == '\n')
            {
                cursor.X = 0;
                cursor.Y++;
            }
            else
            {
                int index = (cursor.Y * Width) + cursor.X;

                // Set character
                buffer[index].Char.AsciiChar = (byte)text[i];

                // Set color
                // (Crazy heckin bitwise crap, don't touch.)
                buffer[index].Attributes = (short)((int)fg | ((int)bg | (2 << 4)));

                // Increment cursor
                cursor.X++;
            }

            // Make sure that cursor does not exceed bounds of window
            if (cursor.X >= Width)
            {
                cursor.X = 0;
                cursor.Y++;
            }
            if (cursor.Y >= Height)
            {
                cursor.Y = 0;
            }
        }

        var writeRegion = WriteRegion;
        Kernel32.WriteConsoleOutput(Handle, buffer, BufferSize, BufferCoord, ref writeRegion);

        Console.SetCursorPosition(cursor.X, cursor.Y);
    }
}

// Taken from 
internal static class Kernel32
{
    [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern SafeFileHandle CreateFile(
        string fileName,
        [MarshalAs(UnmanagedType.U4)] uint fileAccess,
        [MarshalAs(UnmanagedType.U4)] uint fileShare,
        IntPtr securityAttributes,
        [MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
        [MarshalAs(UnmanagedType.U4)] int flags,
        IntPtr template);

    [DllImport("Kernel32.dll", SetLastError = true)]
    public static extern bool WriteConsoleOutput(
        SafeFileHandle hConsoleOutput,
        CharInfo[] lpBuffer,
        Coord dwBufferSize,
        Coord dwBufferCoord,
        ref SmallRect lpWriteRegion);

    [StructLayout(LayoutKind.Sequential)]
    public struct Coord
    {
        public short X;
        public short Y;

        public Coord(short x, short y)
        {
            X = x;
            Y = y;
        }
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct CharUnion
    {
        [FieldOffset(0)] public char UnicodeChar;
        [FieldOffset(0)] public byte AsciiChar;
    }

    [StructLayout(LayoutKind.Explicit)]
    public struct CharInfo
    {
        [FieldOffset(2)] public CharUnion Char;
        [FieldOffset(2)] public short Attributes;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct SmallRect
    {
        public short Left;
        public short Top;
        public short Right;
        public short Bottom;
    }
}

我主要采用了 this post 的实现，添加了一个新的 class 以简化其使用。我不完全确定我的问题出在哪里，因为我的调试器工作不正常，但我很确定它在我在 QuickDraw.

中的实现中

当我尝试使用 QuickDraw.Write() 时，光标移动到它试图打印的任何字符串的末尾，但实际上什么也没有显示。我做错了什么？

Answer 1

首先，你没有正确复制代码。有一些错误。

在 CharInfo 中更改

[FieldOffset(2)] public CharUnion Char;

到

[FieldOffset(0)] public CharUnion Char;
把$CONOUT改成这个CONOUT$
先设置Attribute再设置AsciiChar

当然，如果您想要正确的 foreground-/background 颜色表示，则必须删除 2 << 4。我什至不知道你为什么把它放在那里。

来自 Kernel32 的 WriteConsoleOutput() 不显示文本

WriteConsoleOutput() from Kernel32 not displaying text

c#

kernel32