including dll referenc problem

i want include a dll which provide me some function to read and write data to parallel port. that dll is developed in unsing that dll functios i want to read and write data to parallel port through c#.
wht action i will perform to use that dll. i need any handler function for that wht should i do. plz help me and solve this problem


  • Hi.

    To import some external routine from dll you must use DllImport. For example, following code imports SendMessage function from user32.dll:

    public class MyClass {
    private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, int lParam);

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