PDFOffice_Windows_exe/PDF Office/Model/Dialog/ToolsDialogs/CompressDialogModel/CompressDialogModel.cs

using ComPDFKit.PDFDocument;
using Microsoft.Office.Interop.Word;
using PDF_Master.CustomControl;
using PDF_Master.Helper;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Task = System.Threading.Tasks.Task;

namespace PDF_Master.Model.Dialog.ToolsDialogs
{
    public class CompressDialogModel
    {
        CPDFDocument tempDocument = null;
        IntPtr compressingIntpr = IntPtr.Zero;
        public enum EnumQualityLevel
        {
            StatusLarge = 100,
            StatusStandard = 80,
            StatusDefault = 40,
            StatusLittle = 40,
            StatusMicro = 10
        }

        public EnumQualityLevel CompressQuality { get; set; }

        public static string PageIndex { get; set; }

        public void CompressClear()
        {
            tempDocument.CompressFile_Cancel(compressingIntpr);
            App.mainWindowViewModel.IsProcessVisible = System.Windows.Visibility.Collapsed;
        }
        private int GetIndex(int pageindex)
        {
            App.mainWindowViewModel.Value = (pageindex + 1);

            if (App.mainWindowViewModel.Value == App.mainWindowViewModel.MaxValue) { App.mainWindowViewModel.IsProcessVisible = System.Windows.Visibility.Collapsed; }
            return 0;
        }

        public async void OnOpened(Prism.Services.Dialogs.DialogResult e)
        {
            string filepath = "";
            string password = "";
            try
            {
                if (e.Result == Prism.Services.Dialogs.ButtonResult.Cancel || e.Result == Prism.Services.Dialogs.ButtonResult.None) { return; }
                CPDFDocument doc = null;
                CPDFDocument.GetPageIndexDelegate indexDelegate = null;
                
                int compressquality = 45;
                doc = e.Parameters.GetValue<CPDFDocument>(ParameterNames.PDFDocument);
                filepath = e.Parameters.GetValue<string>(ParameterNames.FilePath);
                try { if (File.Exists(filepath)) File.Delete(filepath); }
                catch
                {
                    AlertsMessage alertsMessage = new AlertsMessage();
                    alertsMessage.ShowDialog("", App.MainPageLoader.GetString("FileNotExistWarning"), App.ServiceLoader.GetString("Text_ok"));
                    return;
                }
                password = e.Parameters.GetValue<string>(ParameterNames.PassWord);
                compressquality = e.Parameters.GetValue<int>("compressDialogModel.CompressQuality");
                if (doc != null)
                {
                    
                    App.mainWindowViewModel.Value = 0;
                    App.mainWindowViewModel.ProgressTitle = "Compressing";
                    App.mainWindowViewModel.IsProcessVisible = System.Windows.Visibility.Visible;
                    App.mainWindowViewModel.MaxValue = doc.PageCount;
                    CPDFDocument document = CPDFDocument.InitWithFilePath(doc.FilePath);
                    document.UnlockWithPassword(password);
                    indexDelegate += GetIndex;
                    compressingIntpr = document.CompressFile_Init(compressquality, indexDelegate);
                    GC.KeepAlive(indexDelegate);//关键  防止委托过早回收
                    tempDocument = document;
                    Trace.WriteLine("compressDialogModel.CompressQuality" + compressquality);
                    App.mainWindowViewModel.ProcessCloseAction = CompressClear;
                    if (await Task.Run<bool>(() => { return document.CompressFile_Start(compressingIntpr, filepath); })) {
                        CommonHelper.ShowFileBrowser(filepath); 
                    }

                    document.Release();
                }
            }
            catch {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("", "Compress file error", App.ServiceLoader.GetString("Text_ok"));
                tempDocument.CompressFile_Cancel(compressingIntpr);
                App.mainWindowViewModel.IsProcessVisible = System.Windows.Visibility.Collapsed;
            }
        }
    }

}