C# Signature:

[DllImport("comdlg32.dll", CharSet = CharSet.Auto, EntryPoint = "ChooseFont", SetLastError=true)]
public extern static bool ChooseFont(IntPtr lpcf);

VB Signature:

Declare Function ChooseFont Lib "comdlg32.dll" (TODO) As TODO

User-Defined Types:

LOGFONT

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct CHOOSEFONT
{
     public int lStructSize;
     public IntPtr hwndOwner;
     public IntPtr hDC;
     public IntPtr lpLogFont;
     public int iPointSize;
     public int Flags;
     public int rgbColors;
     public IntPtr lCustData;
     public IntPtr lpfnHook;
     public string lpTemplateName;
     public IntPtr hInstance;
     public string lpszStyle;
     public short nFontType;
     private short __MISSING_ALIGNMENT__;
     public int nSizeMin;
     public int nSizeMax;
}

[Flags]
public enum CHOOSEFONTFLAGS
{
     CF_SCREENFONTS = 0x00000001,
     CF_PRINTERFONTS = 0x00000002,
     CF_BOTH = (CF_SCREENFONTS | CF_PRINTERFONTS),
     CF_SHOWHELP = 0x00000004,
     CF_ENABLEHOOK = 0x00000008,
     CF_ENABLETEMPLATE = 0x00000010,
     CF_ENABLETEMPLATEHANDLE = 0x00000020,
     CF_INITTOLOGFONTSTRUCT = 0x00000040,
     CF_USESTYLE = 0x00000080,
     CF_EFFECTS = 0x00000100,
     CF_APPLY = 0x00000200,
     CF_ANSIONLY = 0x00000400,
     CF_SCRIPTSONLY = CF_ANSIONLY,
     CF_NOVECTORFONTS = 0x00000800,
     CF_NOOEMFONTS = CF_NOVECTORFONTS,
     CF_NOSIMULATIONS = 0x00001000,
     CF_LIMITSIZE = 0x00002000,
     CF_FIXEDPITCHONLY = 0x00004000,
     CF_WYSIWYG = 0x00008000,
     CF_FORCEFONTEXIST = 0x00010000,
     CF_SCALABLEONLY = 0x00020000,
     CF_TTONLY = 0x00040000,
     CF_NOFACESEL = 0x00080000,
     CF_NOSTYLESEL = 0x00100000,
     CF_NOSIZESEL = 0x00200000,
     CF_SELECTSCRIPT = 0x00400000,
     CF_NOSCRIPTSEL = 0x00800000,
     CF_NOVERTFONTS = 0x01000000,
     CF_INACTIVEFONTS = 0x02000000
}

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

LOGFONT logfont = new LOGFONT();

logfont.lfFaceName = "Segoe UI";

IntPtr pLogfont = Marshal.AllocHGlobal(Marshal.SizeOf(logfont));
Marshal.StructureToPtr(logfont, pLogfont, false);

CHOOSEFONT choosefont = new CHOOSEFONT();
choosefont.lStructSize = Marshal.SizeOf(choosefont);
choosefont.nSizeMin = 64;
choosefont.nSizeMax = 64;
choosefont.Flags = (int)CHOOSEFONTFLAGS.CF_SCREENFONTS
     | (int)CHOOSEFONTFLAGS.CF_FORCEFONTEXIST
     | (int)CHOOSEFONTFLAGS.CF_INACTIVEFONTS
     | (int)CHOOSEFONTFLAGS.CF_INITTOLOGFONTSTRUCT
     | (int)CHOOSEFONTFLAGS.CF_SCALABLEONLY
     | (int)CHOOSEFONTFLAGS.CF_USESTYLE;
choosefont.lpLogFont = pLogfont;

IntPtr pChoosefont = Marshal.AllocHGlobal(Marshal.SizeOf(choosefont));
Marshal.StructureToPtr(choosefont, pChoosefont, false);

bool result = ChooseFont(pChoosefont);

Marshal.FreeHGlobal(pChoosefont);
Marshal.FreeHGlobal(pLogfont);