C# Signature:

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern Int32 SetCurrentConsoleFontEx(
        IntPtr ConsoleOutput,
        bool MaximumWindow,
        ref CONSOLE_FONT_INFO_EX ConsoleCurrentFontEx);

VB Signature:

<DllImport("kernel32.dll")>
    Public Shared Function SetCurrentConsoleFontEx(ConsoleOutput As IntPtr, MaximumWindow As Boolean, ConsoleCurrentFontEx As CONSOLE_FONT_INFO_EX) As Boolean
    End Function

User-Defined Types:

C#:

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

        public COORD(short X, short Y)
        {
        this.X = X;
        this.Y = Y;
        }
    };

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct CONSOLE_FONT_INFO_EX
    {
        public uint cbSize;
        public uint nFont;
        public COORD dwFontSize;
        public int FontFamily;
        public int FontWeight;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] // Edit sizeconst if the font name is too big
        public string FaceName;
    }

You must set cbSize with Marshal.SizeOf using the instance of CONSOLE_FONT_INFO_EX.

Vb:

<StructLayout(LayoutKind.Sequential)>
    Public Structure COORD
    Public X As Short
    Public Y As Short

    Public Sub New(X As Short, Y As Short)
        Me.X = X
        Me.Y = Y
    End Sub
    End Structure

    <StructLayout(LayoutKind.Sequential)>
    Public Structure CONSOLE_FONT_INFO_EX
    Public cbSize As UInteger
    Public nFont As UInteger
    Public dwFontSize As COORD
    Public FontFamily As UShort
    Public FontWeight As UShort

    Public face0, face1, face2, face3, face4, face5, face6, face7 As UInt64
    End Structure

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

// Untested, added during 1-pass copy & paste of windows console fuctions

// Update: C# has been tested

When on Windows XP, kernel32 does NOT support SetCurrentConsoleFontEx and cannot be used. It will throw an error saying entry point not found because of this.

Minimum supported client: Windows Vista

Tips & Tricks:

Please add some!

Sample Code:

C#:

using System.Runtime.InteropServices;
using System;

namespace Win32test
{
    class ConsoleTest
    {

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern Int32 SetCurrentConsoleFontEx(
        IntPtr ConsoleOutput,
        bool MaximumWindow,
        ref CONSOLE_FONT_INFO_EX ConsoleCurrentFontEx);

    private enum StdHandle
    {
        OutputHandle = -11
    }

    [DllImport("kernel32")]
    private static extern IntPtr GetStdHandle(StdHandle index);

    private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);

    static void Main(string[] args)
    {
        // Setting the font and fontsize
        // Other values can be changed too

        Console.Write("Before. Press any key to continue");
        Console.ReadKey();

        // Instantiating CONSOLE_FONT_INFO_EX and setting its size (the function will fail otherwise)
        CONSOLE_FONT_INFO_EX ConsoleFontInfo = new CONSOLE_FONT_INFO_EX();
        ConsoleFontInfo.cbSize = (uint)Marshal.SizeOf(ConsoleFontInfo);

        // Optional, implementing this will keep the fontweight and fontsize from changing
        // Optional, implementing this will keep the fontweight fontsize from changing (unless manually assigned)
        // See notes
        // GetCurrentConsoleFontEx(GetStdHandle(StdHandle.OutputHandle), false, ref ConsoleFontInfo);

        ConsoleFontInfo.FaceName = "Lucida Console";
        ConsoleFontInfo.dwFontSize.X = 6;
        ConsoleFontInfo.dwFontSize.Y = 8;

        SetCurrentConsoleFontEx(GetStdHandle(StdHandle.OutputHandle), false, ref ConsoleFontInfo);

        Console.Clear();
        Console.Write("After. Notice how the font type and size changed?");
        Console.Write("After");
        Console.ReadKey();
    }

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

        public COORD(short X, short Y)
        {
        this.X = X;
        this.Y = Y;
        }
    };

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct CONSOLE_FONT_INFO_EX
    {
        public uint cbSize;
        public uint nFont;
        public COORD dwFontSize;
        public int FontFamily;
        public int FontWeight;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] // Edit sizeconst if the font name is too big
        public string FaceName;
    }
    }
}

Notes:

Check out GetCurrentConsoleFontEx

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