I thought I'd try to use the Cards.Dll that ships with Windows to draw a card on a C# WinF/orm.

The Object Explorer shows this method in Cards.DLL:

cards.cardsdll.drawcard(System.IntPtr, int, int, int, int, int)

So I wrote this:

public class DeckOfCards
{
    [DllImport("cards.dll")]
    private static extern bool drawcard(ref IntPtr handle, ref int top, ref int left, 
           ref int width, ref int height, ref int card);

    public DeckOfCards()
    {
    }

    public bool DrawACard(IntPtr canvas, int top, int left, int width, int height, int card)
    {
        return drawcard(ref canvas, ref top, ref left, ref height, ref width, ref card);
    }
}

Then I attempted to use it like this:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

            DrawCard();
    }

    private void DrawCard()
    {
        DeckOfCards Deck = new DeckOfCards();

        IntPtr hdc = this.Handle;

        Deck.DrawACard(hdc, 10, 10, 100, 50, (int)Ranks.Five * 4 + (int)Suits.Clubs);

    }
}

It dies in the DrawACard method of my class with "Unable to find an entry point named 'drawcard' in DLL "cards.dll'.

As I have little to no experience working with COM in .Net (yet) I'm hoping someone can see what's wrong.