C++ Cannot Install Font in Windows 10 - c++

Question

I have two fonts which are used by my Windows C++ app (Ubuntu, Roboto Regular and Roboto Thin) and I have tried to install them with AddFontResource and AddFontResourceEx but it does not work in the latest Anniversary Edition of Windows 10 and also in Windows Server 2008 and 2012.
The font does not get installed. So I have created my Font Installation C++ class.
In my C++ / VSNET2015 function I do the following:
Copy the .TTF font files in C:\Windows\Fonts
Add the .TTF font files to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Fonts FontName (TrueType) - FontFile.ttf
Call AddFontResource(FontFileName)
Send WM_FONTCHANGE message.
The fonts get installed and works every time, but is working until I restart Windows then it doesn't. The font files are there and the registry entries are ok also the fonts show in the Windows Fonts Explorer, but it cannot be used in my application and the fonts cannot be deleted from Windows Fonts Explorer because the fonts are in use (with the app closed).
/**********************************************************************/
BOOL CInstallFont::InstallFont(CString strFontName, CString strFontFileName, BOOL bRegular)
{
m_strFontName = strFontName;
m_strFontFileName = strFontFileName;
if (IsFontInstalled() == TRUE)
if (CanCreateFont(strFontName)) // try to create the font and if successful, then don't install it again
return TRUE;
/*****************************************************/
/* Copy Font to Windows\Fonts folder */
/*****************************************************/
CPathW pwSrc;
CPathW pwDest;
CString strTmp, strTmp2;
FolderUtils f;
CString strFontsFolder = _T("");
f.GetSpecialFolder(CSIDL_FONTS, strFontsFolder);
strTmp2 = theApp.m_strAppFolder;
pwSrc.Combine(strTmp2, strFontFileName);
pwDest.Combine(strFontsFolder, strFontFileName);
BOOL bRet=CopyFile(pwSrc, pwDest, TRUE);
if (bRet == FALSE)
{
strTmp = _T("Error: Cannot copy font file ");
strTmp += strFontFileName;
AfxMessageBox(strTmp, MB_ICONEXCLAMATION);
}
/*****************************************************/
/* Add Font to Registry */
/*****************************************************/
CRegKey reg;
LONG lRet=0;
lRet = reg.Open(HKEY_LOCAL_MACHINE, _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts"), KEY_READ | KEY_WRITE);
if (lRet == ERROR_SUCCESS)
{
CString strFullFontName = strFontName;
strFullFontName += _T(" (TrueType)");
reg.SetStringValue(strFullFontName, strFontFileName); // For OpenType fonts you need to change the value here
}
reg.Close();
/*****************************************************/
//AddFontResource(strFontFileName);
SendMessage(HWND_BROADCAST, WM_FONTCHANGE, 0, 0);
return TRUE;
}
/**********************************************************************/
int CALLBACK CInstallFont::EnumFontFamExProc(ENUMLOGFONTEX* /*lpelfe*/, NEWTEXTMETRICEX* /*lpntme*/, int /*FontType*/, LPARAM lParam)
{
LPARAM* l = (LPARAM*)lParam;
*l = TRUE;
return TRUE;
}
/**********************************************************************/
/* Test to see if the font can be created */
BOOL CInstallFont::CanCreateFont(CString strFontName)
{
CFont font;
BOOL bRet=font.CreateFont(
16, // nHeight
0, // nWidth
0, // nEscapement
0, // nOrientation
FW_NORMAL, // nWeight
FALSE, // bItalic
FALSE, // bUnderline
0, // cStrikeOut
DEFAULT_CHARSET, // nCharSet
OUT_DEFAULT_PRECIS, // nOutPrecision
CLIP_DEFAULT_PRECIS, // nClipPrecision
ANTIALIASED_QUALITY, // nQuality
DEFAULT_PITCH | FF_SWISS, // nPitchAndFamily
strFontName); // lpszFacename
font.DeleteObject();
return bRet;
}
/**********************************************************************/
BOOL CInstallFont::IsFontInstalled()
{
// Get the screen DC
CDC dc;
if (!dc.CreateCompatibleDC(NULL))
{
return false;
}
LOGFONT lf = { 0 };
// Any character set will do
lf.lfCharSet = DEFAULT_CHARSET;
// Set the facename to check for
wcscpy_s(lf.lfFaceName, m_strFontName.GetLength()*2, (LPCTSTR)m_strFontName);
LPARAM lParam = 0;
// Enumerate fonts
::EnumFontFamiliesEx(dc.GetSafeHdc(), &lf, (FONTENUMPROC)EnumFontFamExProc, (LPARAM)&lParam, 0);
return lParam ? TRUE : FALSE;
}
I call the function with the following parameters
CInstallFont instFont;
instFont.InstallFont(_T("Roboto Light"), _T("Roboto-Light.ttf"));
instFont.InstallFont(_T("Roboto Thin"), _T("Roboto-Thin.ttf"));
instFont.InstallFont(_T("Roboto Regular"), _T("Roboto-Regular.ttf"));