out GLYPHMETRICS lpgm, uint cbBuffer, IntPtr lpvBuffer, ref MAT2 lpmat2);

   ByRef lpgm As GLYPHMETRICS, cbBuffer As UInteger, lpvBuffer As IntPtr, ByRef lpmat2 As MAT2) As Integer

    public struct GLYPHMETRICS

            GLYPHMETRICS metrics = new GLYPHMETRICS();            

[Out] Gdi.GLYPHMETRICSFLOAT[] lpgmf);

public struct GLYPHMETRICSFLOAT

        public Gdi.GLYPHMETRICSFLOAT[] gmf = null;

                gmf = new Gdi.GLYPHMETRICSFLOAT[256];

struct GLYPHMETRICS {

Structure GLYPHMETRICS