我正在开发一个翻译软件插件(C#,.NET 2.0),它在模拟设备显示器中显示翻译的文本。我必须检查是否所有翻译的文本都可以使用指定的字体显示(Windows TTF)。但我没有找到任何方法来检查不受支持的字形的字体。有人有想法吗?
谢谢
您是否仅限于 .NET 2.0?在 .NET 3.0 或更高版本中,有一个GlyphTypeface
类,它可以加载字体文件并公开CharacterToGlyphMap
属性,我相信它可以做你想做的事。
在 .NET 2.0 中,我认为您将不得不依赖 PInvoke。尝试类似:
using System.Drawing;
using System.Runtime.InteropServices;
[DllImport("gdi32.dll", EntryPoint = "GetGlyphIndicesW")]
private static extern uint GetGlyphIndices([In] IntPtr hdc, [In] [MarshalAs(UnmanagedType.LPTStr)] string lpsz, int c, [Out] ushort[] pgi, uint fl);
[DllImport("gdi32.dll")]
private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
private const uint GGI_MARK_NONEXISTING_GLYPHS = 0x01;
// Create a dummy Graphics object to establish a device context
private Graphics _graphics = Graphics.FromImage(new Bitmap(1, 1));
public bool DoesGlyphExist(char c, Font font)
{
// Get a device context from the dummy Graphics
IntPtr hdc = _graphics.GetHdc();
ushort[] glyphIndices;
try {
IntPtr hfont = font.ToHfont();
// Load the font into the device context
SelectObject(hdc, hfont);
string testString = new string(c, 1);
glyphIndices = new ushort[testString.Length];
GetGlyphIndices(hdc, testString, testString.Length, glyphIndices, GGI_MARK_NONEXISTING_GLYPHS);
} finally {
// Clean up our mess
_graphics.ReleaseHdc(hdc);
}
// 0xffff is the value returned for a missing glyph
return (glyphIndices[0] != 0xffff);
}
private void Test()
{
Font f = new Font("Courier New", 10);
// Glyph for A is found -- returns true
System.Diagnostics.Debug.WriteLine(DoesGlyphExist('A', f).ToString());
// Glyph for ಠ is not found -- returns false
System.Diagnostics.Debug.WriteLine(DoesGlyphExist((char) 0xca0, f).ToString());
}