【发布时间】：2011-03-30 00:43:12
【问题描述】：
我的最终目标是列出 Windows 计算机上的所有活动字体。例如，如果您启动写字板或 Word，您将看到它们全部。其中一些字体来自 windows\fonts 文件夹，但不是全部。有些是使用 gdi32.dll 调用 AddFontResource(...) 动态注册的。现在，您会认为 C# 支持检索整个列表，如果是这样，请告诉我！
但是，在花费了很多时间之后，用于安装系统字体的常规 C# 调用仅检索实际处于活动状态的所有字体中的一部分。例如，InstalledFontCollection.Families 没有找到任何使用 AddFontResource 添加的字体（它找到了写字板中列出的大约 25% 的字体！）
虽然我想在 C# 中执行此操作，但似乎我必须使用更多 gdi32.dll 调用。我的 EnumFontFamiliesEx 问题就这样开始了。
我已经设法让以下代码正常工作，以至于我得到了一堆带有字体的回调。但是，结构 ENUMLOGFONTEX 似乎已损坏，例如 lpelfe.elfFullName 通常包含几个方形字符，而不是真实姓名。也许我在编组或结构定义中犯了一个错误，不太确定。我尝试了很多次迭代和无休止的谷歌搜索，但无济于事。
非常感谢任何帮助。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Windows.Media;
using System.Runtime.InteropServices;
using Microsoft.Win32;
namespace FontRetriever
{
public partial class TestForm : Form
{
[DllImport("gdi32.dll")]
static extern int EnumFontFamiliesEx(IntPtr hdc,
[In] IntPtr pLogfont,
EnumFontExDelegate lpEnumFontFamExProc,
IntPtr lParam,
uint dwFlags);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class LOGFONT
{
public int lfHeight;
public int lfWidth;
public int lfEscapement;
public int lfOrientation;
public FontWeight lfWeight;
[MarshalAs(UnmanagedType.U1)]
public bool lfItalic;
[MarshalAs(UnmanagedType.U1)]
public bool lfUnderline;
[MarshalAs(UnmanagedType.U1)]
public bool lfStrikeOut;
public FontCharSet lfCharSet;
public FontPrecision lfOutPrecision;
public FontClipPrecision lfClipPrecision;
public FontQuality lfQuality;
public FontPitchAndFamily lfPitchAndFamily;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string lfFaceName;
}
public enum FontWeight : int
{
FW_DONTCARE = 0,
FW_THIN = 100,
FW_EXTRALIGHT = 200,
FW_LIGHT = 300,
FW_NORMAL = 400,
FW_MEDIUM = 500,
FW_SEMIBOLD = 600,
FW_BOLD = 700,
FW_EXTRABOLD = 800,
FW_HEAVY = 900,
}
public enum FontCharSet : byte
{
ANSI_CHARSET = 0,
DEFAULT_CHARSET = 1,
SYMBOL_CHARSET = 2,
SHIFTJIS_CHARSET = 128,
HANGEUL_CHARSET = 129,
HANGUL_CHARSET = 129,
GB2312_CHARSET = 134,
CHINESEBIG5_CHARSET = 136,
OEM_CHARSET = 255,
JOHAB_CHARSET = 130,
HEBREW_CHARSET = 177,
ARABIC_CHARSET = 178,
GREEK_CHARSET = 161,
TURKISH_CHARSET = 162,
VIETNAMESE_CHARSET = 163,
THAI_CHARSET = 222,
EASTEUROPE_CHARSET = 238,
RUSSIAN_CHARSET = 204,
MAC_CHARSET = 77,
BALTIC_CHARSET = 186,
}
public enum FontPrecision : byte
{
OUT_DEFAULT_PRECIS = 0,
OUT_STRING_PRECIS = 1,
OUT_CHARACTER_PRECIS = 2,
OUT_STROKE_PRECIS = 3,
OUT_TT_PRECIS = 4,
OUT_DEVICE_PRECIS = 5,
OUT_RASTER_PRECIS = 6,
OUT_TT_ONLY_PRECIS = 7,
OUT_OUTLINE_PRECIS = 8,
OUT_SCREEN_OUTLINE_PRECIS = 9,
OUT_PS_ONLY_PRECIS = 10,
}
public enum FontClipPrecision : byte
{
CLIP_DEFAULT_PRECIS = 0,
CLIP_CHARACTER_PRECIS = 1,
CLIP_STROKE_PRECIS = 2,
CLIP_MASK = 0xf,
CLIP_LH_ANGLES = (1 << 4),
CLIP_TT_ALWAYS = (2 << 4),
CLIP_DFA_DISABLE = (4 << 4),
CLIP_EMBEDDED = (8 << 4),
}
public enum FontQuality : byte
{
DEFAULT_QUALITY = 0,
DRAFT_QUALITY = 1,
PROOF_QUALITY = 2,
NONANTIALIASED_QUALITY = 3,
ANTIALIASED_QUALITY = 4,
CLEARTYPE_QUALITY = 5,
CLEARTYPE_NATURAL_QUALITY = 6,
}
[Flags]
public enum FontPitchAndFamily : byte
{
DEFAULT_PITCH = 0,
FIXED_PITCH = 1,
VARIABLE_PITCH = 2,
FF_DONTCARE = (0 << 4),
FF_ROMAN = (1 << 4),
FF_SWISS = (2 << 4),
FF_MODERN = (3 << 4),
FF_SCRIPT = (4 << 4),
FF_DECORATIVE = (5 << 4),
}
[StructLayout(LayoutKind.Sequential)]
public class NEWTEXTMETRICEX
{
//public const int LF_FACESIZE = 32;
public int tmHeight;
public int tmAscent;
public int tmDescent;
public int tmInternalLeading;
public int tmExternalLeading;
public int tmAveCharWidth;
public int tmMaxCharWidth;
public int tmWeight;
public int tmOverhang;
public int tmDigitizedAspectX;
public int tmDigitizedAspectY;
public char tmFirstChar;
public char tmLastChar;
public char tmDefaultChar;
public char tmBreakChar;
public byte tmItalic;
public byte tmUnderlined;
public byte tmStruckOut;
public byte tmPitchAndFamily;
public byte tmCharSet;
}
private const byte DEFAULT_CHARSET = 1;
private const byte SHIFTJIS_CHARSET = 128;
private const byte JOHAB_CHARSET = 130;
private const byte EASTEUROPE_CHARSET = 238;
private const byte DEFAULT_PITCH = 0;
private const byte FIXED_PITCH = 1;
private const byte VARIABLE_PITCH = 2;
private const byte FF_DONTCARE = (0 << 4);
private const byte FF_ROMAN = (1 << 4);
private const byte FF_SWISS = (2 << 4);
private const byte FF_MODERN = (3 << 4);
private const byte FF_SCRIPT = (4 << 4);
private const byte FF_DECORATIVE = (5 << 4);
public TestForm()
{
InitializeComponent();
}
private int cnt = 0;
private void TestForm_Load(object sender, EventArgs e)
{
LOGFONT lf = CreateLogFont("");
IntPtr plogFont = Marshal.AllocHGlobal(Marshal.SizeOf(lf));
Marshal.StructureToPtr(lf, plogFont, true);
int ret = 0;
try
{
Graphics G = pictureBox1.CreateGraphics();
IntPtr P = G.GetHdc();
del1 = new EnumFontExDelegate(callback1);
ret = EnumFontFamiliesEx(P, plogFont, del1, IntPtr.Zero, 0);
System.Diagnostics.Trace.WriteLine("EnumFontFamiliesEx = " + ret.ToString());
}
catch
{
System.Diagnostics.Trace.WriteLine("Exception");
}
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct ENUMLOGFONTEX
{
public LOGFONT elfLogFont;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
public string elfFullName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string elfStyle;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string elfScript;
}
public delegate int EnumFontExDelegate(ref ENUMLOGFONTEX lpelfe, IntPtr lpntme, int FontType, int lParam);
public EnumFontExDelegate del1;
public int callback1(ref ENUMLOGFONTEX lpelfe, IntPtr lpntme, int FontType, int lParam)
{
try
{
++cnt;
Font F = Font.FromLogFont(lpelfe.elfLogFont);
Console.WriteLine(F.Name + " " + lpelfe.elfFullName);
}
catch
{
System.Diagnostics.Trace.WriteLine("What happened?");
}
return cnt;
}
public static LOGFONT CreateLogFont(string fontname)
{
LOGFONT lf = new LOGFONT();
lf.lfHeight = 0;
lf.lfWidth = 0;
lf.lfEscapement = 0;
lf.lfOrientation = 0;
lf.lfWeight = 0;
lf.lfItalic = false;
lf.lfUnderline = false;
lf.lfStrikeOut = false;
lf.lfCharSet = FontCharSet.DEFAULT_CHARSET;
lf.lfOutPrecision = 0;
lf.lfClipPrecision = 0;
lf.lfQuality = 0;
lf.lfPitchAndFamily = FontPitchAndFamily.FF_DONTCARE;
lf.lfFaceName = "";
return lf;
}
}
}
【问题讨论】：