/// <summary>
/// Validate the header and CRC-32 of this structure.
/// </summary>
/// <returns>True if the structure is valid.</returns>
/// <remarks></remarks>
public bool Validate()
{
bool ValidateRet = default;
var mm = new MemPtr();
mm.FromStruct(this);
mm.UIntAt(4L) = 0U;
// validate the crc and the signature moniker
ValidateRet = HeaderCRC32 == mm.CalculateCrc32() && Signature == 0x5452415020494645;
mm.Free();
return(ValidateRet);
}
public static IntPtr DoRegisterDeviceClassNotification(IntPtr hWnd, Guid devclass)
{
var mm = new MemPtr();
var bh = new DEV_BROADCAST_HDR();
var di = new DEV_BROADCAST_DEVICEINTERFACE();
bh.dbch_size = Marshal.SizeOf <DEV_BROADCAST_HDR>();
di.dbcc_size = Marshal.SizeOf <DEV_BROADCAST_DEVICEINTERFACE>();
bh.dbch_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
di.dbcc_classguid = devclass;
mm.Alloc(bh.dbch_size + di.dbcc_size);
mm.FromStruct(bh);
mm.FromStructAt(bh.dbch_size, di);
var ret = RegisterDeviceNotification(hWnd, mm, DEVICE_NOTIFY_WINDOW_HANDLE);
mm.Free();
return(ret);
}
/// <summary>
/// Gets a collection of fonts based on the specified criteria.
/// </summary>
/// <param name="families">Bit Field representing which font families to retrieve.</param>
/// <param name="pitch">Specify the desired pitch.</param>
/// <param name="charset">Specify the desired character set.</param>
/// <param name="weight">Specify the desired weight.</param>
/// <param name="Script">Specify the desired script(s) (this can be a String or an array of Strings).</param>
/// <param name="Style">Specify the desired style(s) (this can be a String or an array of Strings).</param>
/// <returns></returns>
public static FontCollection GetFonts(FontFamilies families = FontFamilies.DontCare, FontPitch pitch = FontPitch.Default, FontCharSet charset = FontCharSet.Default, FontWeight weight = FontWeight.DontCare, object Script = null, object Style = null)
{
IntPtr hdc;
var fonts = new List <ENUMLOGFONTEX>();
var lf = new LOGFONT();
string s;
MemPtr mm = new MemPtr();
string[] wscript;
string[] wstyle;
if (Script is null)
{
wscript = new[] { "Western" };
}
else if (Script is string)
{
wscript = new[] { (string)(Script) };
}
else if (Script is string[])
{
wscript = (string[])Script;
}
else
{
throw new ArgumentException("Invalid parameter type for Script");
}
if (Style is null)
{
wstyle = new[] { "", "Normal", "Regular" };
}
else if (Style is string)
{
wstyle = new[] { (string)(Style) };
}
else if (Style is string[])
{
wstyle = (string[])Style;
}
else
{
throw new ArgumentException("Invalid parameter type for Style");
}
lf.lfCharSet = (byte)charset;
lf.lfFaceName = "";
mm.Alloc(Marshal.SizeOf(lf));
mm.FromStruct(lf);
hdc = User32.CreateDC("DISPLAY", null, IntPtr.Zero, IntPtr.Zero);
int e;
bool bo = false;
e = EnumFontFamiliesEx(hdc, mm, (ref ENUMLOGFONTEX lpelfe, IntPtr lpntme, uint FontType, IntPtr lParam) =>
{
int z;
if (fonts is null)
{
z = 0;
}
else
{
z = fonts.Count;
}
// make sure it's the normal, regular version
bo = false;
foreach (var y in wstyle)
{
if ((y.ToLower() ?? "") == (lpelfe.elfStyle.ToLower() ?? ""))
{
bo = true;
break;
}
}
if (bo == false)
{
return(1);
}
bo = false;
foreach (var y in wscript)
{
if ((y.ToLower() ?? "") == (lpelfe.elfScript.ToLower() ?? ""))
{
bo = true;
break;
}
}
if (bo == false)
{
return(1);
}
bo = false;
if (weight != FontWeight.DontCare && lpelfe.elfLogFont.lfWeight != (int)weight)
{
return(1);
}
// we don't really need two of the same font.
if (z > 0)
{
if ((lpelfe.elfFullName ?? "") == (fonts[z - 1].elfFullName ?? ""))
{
return(1);
}
}
// the @ indicates a vertical writing font which we definitely do not want.
if (lpelfe.elfFullName.Substring(0, 1) == "@")
{
return(1);
}
if (!CheckFamily(lpelfe.elfLogFont, families))
{
return(1);
}
// lpelfe.elfLogFont.lfCharSet = charset
// If (lpelfe.elfLogFont.lfCharSet <> charset) Then Return 1
if (pitch != FontPitch.Default && (lpelfe.elfLogFont.lfPitchAndFamily & 3) != (int)pitch)
{
return(1);
}
fonts.Add(lpelfe);
return(1);
}, IntPtr.Zero, 0U);
User32.DeleteDC(hdc);
mm.Free();
if (e == 0)
{
e = User32.GetLastError();
s = NativeError.Message;
}
FontInfo nf;
var ccol = new FontCollection();
foreach (var f in fonts)
{
nf = new FontInfo(f);
ccol.Add(nf);
}
ccol.Sort();
return(ccol);
}
/// <summary>
/// Copy the ENUMLOGFONTEX structure for this object into a memory buffer.
/// </summary>
/// <param name="lpElf">Pointer to a buffer to receive the ENUMLOGFONTEX structure. The memory must already be allocated and freed by the caller.</param>
public void GetElfEx(IntPtr lpElf)
{
var mm = new MemPtr(lpElf);
mm.FromStruct(elf);
}