mes-client/UAS-出货标签管理/PublicMethod/GlobalEventsHandler.cs

using System.Data;
using System.Windows.Forms;
using UAS_LabelMachine;
using UAS_LabelMachine.Entity;
using UAS_LabelMachine.PublicMethod;

namespace UAS_Labeling.PublicMethod
{
    /// <summary>
    /// Author zhangz   2016/12/30
    /// 全局事件处理，通过句柄获取触发事件的控件
    /// 结合捕获的全局的键盘事件来验证用户进行的操作
    /// </summary>
    class GlobalEventsHandler : IMessageFilter
    {
        DataHelper dh;
        //鼠标左键点击
        public const int WM_LBUTTONDOWN = 0x0201;
        //键盘敲击事件
        public const int WM_KEYDOWN = 0x100;

        public bool PreFilterMessage(ref Message m)
        {
            //通过句柄去获取具体触发事件的控件
            Control c = Control.FromHandle(m.HWnd);
            //可进行数据操作的控件需要进行权限的判断,结合WM_LBUTTONDOWN对按钮进行判断
            if (c != null && m.Msg == WM_LBUTTONDOWN && c is Button)
            {
                LogManager.DoLog("点击【" + c.Text+"】");
                return CheckPower(c);
            }
            else
                return false;
        }

        /// <summary>
        /// 返回True表示消息已处理，不再往后传递
        /// 返回False表示消息未处理，后续程序处理此事件
        /// </summary>
        /// <param name="c"></param>
        /// <returns></returns>
        private bool CheckPower(Control c)
        {
            dh = new DataHelper();
            if (User.UserAccountType != "admin")
            {
                if (dh.getRowCount("labelprintpower") > 0)
                {
                    string sql = " select LPP_CLEANDETAIL,LPP_GENCODE,LPP_LABELMATAIN,LPP_SAVEDETAIL,LPP_COLLECTSTRATEGY,LPP_ALLCOLLECT from labelprintpower left join employee on em_code = lpp_emcode where lpp_emcode = '" + User.UserCode + "'";
                    DataTable dt = (DataTable)dh.ExecuteSql(sql, "select");
                    if (dt.Rows.Count > 0)
                    {
                        switch (c.Text)
                        {
                            case "采集策略设置":
                                if (dt.Rows[0]["LPP_COLLECTSTRATEGY"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            case "生成条码":
                                if (dt.Rows[0]["LPP_GENCODE"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            case "标签维护":
                                if (dt.Rows[0]["LPP_LABELMATAIN"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            case "保存明细":
                                if (dt.Rows[0]["LPP_SAVEDETAIL"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            case "清除明细":
                                if (dt.Rows[0]["LPP_CLEANDETAIL"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            case "全部已采":
                                if (dt.Rows[0]["LPP_ALLCOLLECT"].ToString() != "1")
                                {
                                    MessageBox.Show("没有" + c.Text + "的权限");
                                    return true;
                                }
                                break;
                            default:
                                break;
                        }
                    }
                    else {
                        MessageBox.Show("尚未配置权限，请与管理员联系");
                        return true;
                    }
                }
            }
            return false;
        }
    }
}