Using VC++ code in c# Application

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I have created one application in VC++ which creates bitmap data according to Text
and I have exported the function from VC++ dll.

In C#, i am accessing this function by using DllImport
I want to pass LOGFONT structure as a parameter to VC++ application through C#.

How can i pass this?

Please Refer to Code sample
VC++

Exported Function looks like this
void MyDllMethod(BYTE *pbByteArray,char* a_sMessage,int a_eHorizontalAllignment, bool a_bDrawVertical,LOGFONT m_winLogFont);

c#
LOGFONT structure is defined as

public struct LOGFONT
    {
        public int lfHeight;
        public int lfWidth;
        public int lfEscapement;
        public int lfOrientation;
        public int lfWeight;
        public byte lfItalic;
        public byte lfUnderline;
        public byte lfStrikeOut;
        public byte lfCharSet;
        public byte lfOutPrecision;
        public byte lfClipPrecision;
        public byte lfQuality;
        public byte lfPitchAndFamily;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string lfFaceName;

        public LOGFONT(bool test)
        {
            lfHeight = 0;
            lfWidth = 0;
            lfEscapement = 0;
            lfOrientation = 0;
            lfWeight = 0;
            lfItalic = 0;
            lfUnderline = 0;
            lfStrikeOut = 0;
            lfCharSet = 0;
            lfOutPrecision = 0;
            lfClipPrecision = 0;
            lfQuality = 0;
            lfPitchAndFamily = 0;
            lfFaceName = "Arial";
        }
    }

[DllImport("Bitmap Creation.dll", EntryPoint = "MyDllMethod", ExactSpelling = false,CallingConvention = CallingConvention.Cdecl)]

public static extern void MyDllMethod(IntPtrbyteArray,                                               [MarshalAs(UnmanagedType.LPStr)]string message,
           int a_eHorizontalAllignment, bool a_bDrawVertical,LOGFONT a_logFont);

But in VC++ application, I am getting some garbaouge values in LOGFONT structure.
Please Help..... waiting for your reply...