Hi Dave,

I believe it's related to the font created in .NET code doesn't correctly
fallback to other fonts properly.

I've created a win32 DLL to do the call and it seems working correctly:

// File FontUtil.cpp
// cl /LD /D "_UNICODE" /D "UNICODE" user32.lib kernel32.lib gdi32.lib
#define _WIN32_WINNT 0x0500
#include <windows.h>
#include <tchar.h>

#define FONTUTIL_EXPORTS

#ifdef FONTUTIL_EXPORTS
#define FONTUTIL_API __declspec(dllexport)
#else
#define FONTUTIL_API __declspec(dllimport)
#endif

extern "C" {
   FONTUTIL_API BOOL IsFontInstalled(LPCTSTR szFontName);
   FONTUTIL_API BOOL IsCharactersAvailableInFont(LPCTSTR szFontName,
LPCTSTR characters);
}

static int CALLBACK EnumFontFamProc(CONST ENUMLOGFONT *lpelf,
                            CONST NEWTEXTMETRIC *lpntm,
                            DWORD FontType,
                            LPARAM lParam
                            )
{
    *((BOOL*)lParam) = TRUE;
    return 0;
}

BOOL IsFontInstalled(LPCTSTR szFontName)
{
    BOOL bIsInstalled = FALSE;
    HDC hDC = GetDC(NULL);
    EnumFontFamilies(hDC, szFontName, (FONTENUMPROC) EnumFontFamProc, (LPARAM)
&bIsInstalled);
    ReleaseDC(NULL, hDC);
    return bIsInstalled;
}

BOOL IsCharactersAvailableInFont(LPCTSTR szFontName, LPCTSTR characters)
{
    HDC hdc;
    HFONT hFontOld;
    HFONT hFontNew;
    BOOL bResult = TRUE;

    hFontNew = CreateFont(0, 0, 0, 0, FW_DONTCARE, FALSE, FALSE, FALSE,
        DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
        DEFAULT_QUALITY, DEFAULT_PITCH | FF_DONTCARE,
        szFontName);
    if (hFontNew == NULL) return FALSE;

    hdc = GetDC(NULL);
    hFontOld = (HFONT) SelectObject(hdc, hFontNew);

   int count = _tcslen(characters);
   WORD* indices = new WORD[count];
   DWORD dwRet = GetGlyphIndices(hdc, characters, count, &indices[0],
GGI_MARK_NONEXISTING_GLYPHS);
   if (dwRet == GDI_ERROR) {
       bResult = FALSE;
   } else {
       for (int i = 0; i < count; i++) {
           if (indices[i] == 0xffff) {
               bResult = FALSE;
               break;
           }
       }
   }

    SelectObject(hdc, hFontOld);
    DeleteObject(hFontNew);
    ReleaseDC(NULL, hdc);

    return bResult;
}

Save above code as "FontUtil.cpp", open a VS2005 environment command
prompt, run command:

cl /LD /D "_UNICODE" /D "UNICODE" FontUtil.cpp user32.lib kernel32.lib
gdi32.lib

This will generate FontUtil.dll.

In your .NET, use following code to check if a CultureInfo.NativeName can
be displayed in Font "MS Shell Dlg", which is a virtual font name when you
use default font in WinForm:

[DllImport(@"FontUtil.dll", CharSet=CharSet.Unicode)]
static extern bool IsCharactersAvailableInFont(string fontName, string
text);

[DllImport(@"FontUtil.dll", CharSet = CharSet.Unicode)]
static extern bool IsFontInstalled(string fontName);

static void Main(string[] args)
{
   Console.WriteLine(IsFontInstalled("Berlin Sans FB Demi"));
   foreach (CultureInfo ci in
CultureInfo.GetCultures(CultureTypes.AllCultures))
   {
       if (!IsCharactersAvailableInFont("MS Shell Dlg", ci.NativeName))
       {
           Console.WriteLine(ci.Name);
       }
   }
}

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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