kev/Drawer/FlexenabledLic/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace FlexenabledLic
{
    public partial class Form1 : Form
    {
        [STAThread]
        static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
        public Form1()
        {
            InitializeComponent();
            Form1.Initialize();
        }

        private void checkBoxF1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBoxF1.Checked)
            {
                // try to check out F1
                this.Cursor = Cursors.WaitCursor;

                StringBuilder str = new StringBuilder(200);

                int stat = Form1.CheckOut("GDFOcx", str);

                if (stat == 0)
                {
                    pictureBoxF1.BackColor = Color.Lime;
                    labelFlexMsgs.Text = str.ToString();
                }
                else
                {
                    pictureBoxF1.BackColor = Color.Red;
                    checkBoxF1.Checked = false;
                    labelFlexMsgs.Text = "GDFOcx not checked out.";
                }
                this.Cursor = Cursors.Default;
            }
            else
            {
                // check in F1
                Form1.CheckIn("polygel");
                pictureBoxF1.BackColor = Color.LightGray;
                labelFlexMsgs.Text = "polygel checked in.";
            }
        }

        /// prototypes from DLL
        [DllImport("FlexDll.dll", CharSet = CharSet.Ansi)]
        public static extern int Initialize();
        [DllImport("FlexDll.dll", CharSet = CharSet.Ansi)]
        //[DllImport("FlexDll.dll", EntryPoint = "CheckOut", ExactSpelling = false, CallingConvention = CallingConvention.Cdecl)]
        public static extern int CheckOut(String FeatureName, StringBuilder OutMsg);
        [DllImport("FlexDll.dll", CharSet = CharSet.Ansi)]
        public static extern int CheckIn(String FeatureName);
        [DllImport("FlexDll.dll", CharSet = CharSet.Ansi)]
        public static extern int CleanUp();
    }
}