在C#中更改控制台窗口中的字体

Question

我有一个用C#编写的程序,它使用Raster字体中不可用的字符.所以我想将字体更改为Lucida Console.

若要以编程方式更改Console字体,我使用此代码的SetCurrentConsoleFontEx()(源:MSDN控制台类)但我在调用SetCurrentConsoleFontEx()时遇到System.AccessViolationException.

谁能帮助我？

谢谢你的帮助.

using System;
using System.Linq;
using System.Runtime.InteropServices;


namespace ConsoleExtender 
{
  public static class ConsoleHelper
  {
      [StructLayout(LayoutKind.Sequential)]
      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];
      }

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

          internal COORD(short x, short y)
          {
              X = x;
              Y = y;
          }
      }
      [DllImport("kernel32.dll", SetLastError = true)]
      static extern IntPtr GetStdHandle(int nStdHandle);

      [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
      static extern bool GetCurrentConsoleFontEx(
             IntPtr consoleOutput,
             bool maximumWindow,
             ref CONSOLE_FONT_INFO_EX lpConsoleCurrentFontEx);

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

      private const int STD_OUTPUT_HANDLE = -11;
      private const int TMPF_TRUETYPE = 4;
      private const int LF_FACESIZE = 32;
      private static IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);

      public static void SetConsoleFont(string fontName = "Lucida Console") 
      {
          unsafe
          {
            IntPtr hnd = GetStdHandle(STD_OUTPUT_HANDLE);
            if (hnd != INVALID_HANDLE_VALUE)
            {
                CONSOLE_FONT_INFO_EX info = new CONSOLE_FONT_INFO_EX();
                info.cbSize = (uint)Marshal.SizeOf(info);

                // Set console font to Lucida Console.
                CONSOLE_FONT_INFO_EX newInfo = new CONSOLE_FONT_INFO_EX();
                newInfo.cbSize = (uint)Marshal.SizeOf(newInfo);
                newInfo.FontFamily = TMPF_TRUETYPE;
                IntPtr ptr = new IntPtr(newInfo.FaceName);
                Marshal.Copy(fontName.ToCharArray(), 0, ptr, fontName.Length);

                // Get some settings from current font.
                newInfo.dwFontSize = new COORD(info.dwFontSize.X, info.dwFontSize.Y);
                newInfo.FontWeight = info.FontWeight;
                SetCurrentConsoleFontEx(hnd, false, newInfo);
            }
          }
      }
  }
}

Answer 1

您定义这些API调用的方式存在两个问题.

首先,文档的SetCurrentConsoleFontEx说:

lpConsoleCurrentFontEx

指向CONSOLE_FONT_INFOEX包含字体信息的结构的指针.

所以第三个参数需要通过引用传递:

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

你需要调用这样的方法:

SetCurrentConsoleFontEx(hnd, false, ref newInfo);

其次,结构中的FaceName字段CONSOLE_FONT_INFO_EX是Unicode字符数组.我必须指定CharSet让它工作:

[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];
}

Answer 2

我不知道为什么会这样，但如果您转到“属性”->“构建”并禁用“首选 32 位”，您将不会再收到错误。