C# Signature:

[DllImport("gdi32.dll")]
static extern uint GetOutlineTextMetrics(IntPtr hdc, uint cbData, IntPtr ptrZero);

User-Defined Types:

OUTLINETEXTMETRIC

Notes:

Since otmpFamilyName, otmpFaceName, otmpStyleName, otmpFullName are actually offsets into the structure from the beginning of the structure you need double call GetOutlineTextMetrics.

First call returns needed buffer size the second fills buffer by actual data.

Sample Code:

private static void GetOutlineMetrics(IntPtr hdc)
{
    uint cbBuffer = GetOutlineTextMetrics(hdc, 0, IntPtr.Zero);
    if (cbBuffer == 0)
        return;
    IntPtr buffer = Marshal.AllocHGlobal((int)cbBuffer);
      try
    {
        if (GetOutlineTextMetrics(hdc, cbBuffer, buffer) != 0)
        {
            OUTLINETEXTMETRIC otm = new OUTLINETEXTMETRIC();
            otm = (OUTLINETEXTMETRIC)Marshal.PtrToStructure(buffer, typeof(OUTLINETEXTMETRIC));
            string otmpFamilyName = Marshal.PtrToStringAnsi(new IntPtr((int)buffer + otm.otmpFamilyName));
            string otmpFaceName = Marshal.PtrToStringAnsi(new IntPtr((int)buffer + otm.otmpFaceName));;
            string otmpStyleName = Marshal.PtrToStringAnsi(new IntPtr((int)buffer + otm.otmpStyleName));;
            string otmpFullName = Marshal.PtrToStringAnsi(new IntPtr((int)buffer + otm.otmpFullName));;
        }
    }
    finally
    {
        Marshal.FreeHGlobal(buffer);
    }
}

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