Changing font in a Console window in C#

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There’s two problems with the way you’ve defined those API calls.

First, the documentation for SetCurrentConsoleFontEx says:

lpConsoleCurrentFontEx

A pointer to a CONSOLE_FONT_INFOEX structure that contains the font information.

So the third parameter needs to be passed by reference:

[DllImport("kernel32.dll", SetLastError = true)]
static extern bool SetCurrentConsoleFontEx(
    IntPtr consoleOutput,
    bool maximumWindow,
    ref CONSOLE_FONT_INFO_EX consoleCurrentFontEx);

and you need to call the method like this:

SetCurrentConsoleFontEx(hnd, false, ref newInfo);

Secondly, the FaceName field in the CONSOLE_FONT_INFO_EX structure is an array of Unicode characters. I had to specify the CharSet to get it to work:

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal unsafe struct CONSOLE_FONT_INFO_EX
{
    internal uint cbSize;
    internal uint nFont;
    internal COORD dwFontSize;
    internal int FontFamily;
    internal int FontWeight;
    internal fixed char FaceName[LF_FACESIZE];
}

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