暂停我的应用程序，直到可以读取文件 [英] Pause my application until a file can be read

问题描述

嗨！

我的应用程序打开另一个应用程序(红色TITIAN)将.pcl文件转换为.pdf文件，我必须等待一个文件，即转换完成后可以打开的日志文件.直到我想冻结，睡觉，暂停我的应用程序，我才尝试这样做:

Hi!

My application opens another application(RED TITIAN) to convert .pcl files into .pdf files and I must wait for a file, a log file that can be open when the conversion is complete. Until the I want to freez, sleep, pause my application , I tried this :

public void OprireProces(string fis)
       {
           FileInfo Size = new FileInfo(fis);
           if (Size.Length > 629145600)
           {
               Thread.Sleep(180000);
           }
           //daca fisierul pcl este mai mare de 100 MB pune pauza de 2 min

           else if (Size.Length > 104857600)
                {
                    Thread.Sleep(120000);
                }
           fis = fis.Replace(".pcl", ".csv");
           Process[] processlist = Process.GetProcessesByName("escapee");
           bool p = false;
           //se verifica daca fisierul csv poate fi citit
              p = VerificareCSV(fis);
           //daca p = false, adica fisierul csv nu poate fi citit, se reia functia de oprire a procesului
              if (!p)
                   OprireProces(fis);
           //daca p == true se opreste procesul escapee
              else
                   processlist[0].Kill();
       }

函数VerificareCSV，仅检查相应文件是否可读，并返回false或true:

the function VerificareCSV, just checks if the respective file can be read or not, and returns false or true:

public bool VerificareCSV(string fis)
       {

           fis = fis.Replace(".pcl", ".csv");
           FileStream stream = null;
           try
           {
               stream = File.Open(fis, FileMode.Open, FileAccess.ReadWrite, FileShare.None);
           }
           catch (IOException)
           {
               //daca se intalneste o excetie de Input/Output
               //adica nu se poate deschide
               //sau este inca procesat de un thread
               return false;
           }
           finally
           {
               if (stream != null)
                   stream.Close();
           }
           return true;
       }

当我的应用程序必须等待RED TITAN转换大文件时(大约10或15分钟)，就会出现问题，我认为是Thred.Sleep的原因，但是我可以想到另一种方法来暂停我的应用程序.崩溃是("MyApplication已停止工作" ...)


有人可以告诉我是我做错了吗?

谢谢！

the problem occoures when my application has to wait for RED TITAN to convert big files, around 10 or 15 min., I think that Thred.Sleep is the cause, but I can think of another way to pause my application. The crash is ("MyApplication has stop working"...)


Can some one tell me were did I made a mistake ?

Thanks!

推荐答案

我注意到的第一件事是，您的最长暂停时间为3分钟，因此，对于写入时间超过3分钟的文件，您将获得IO例外.

我这样做的方法是检查文件的大小，然后在1/2秒后再次检查文件的大小.
如果在此期间文件大小没有更改，我会认为文件写入已完成.

您可以增加此1/2秒的检查时间，但是作为信封估计的基础，我想说，如果可以读取文件，则每1/2秒检查一次文件大小应该可以使您有所了解...

First thing I noticed is that your longest pause is for 3 minutes so for a file that takes over 3 minutes to write you are going to get an IO Exception.

The way I would do this is to inspect the file''s size, then 1/2 seconds later inspect the size again.
If the file size had not changed in that period I would consider the file writing as complete.

You could increase this 1/2 second inspection time, but as a back of envelope estimate I would say that inspecting the file size every 1/2 second should give you a good idea if it is ready to read...

在启动TITAN程序之后，您可以弹出一个模式对话框(假定为winform)，并等待该文件出现在Verificare()中.

启动Titan之后，我将启动一个计时器，该计时器每#n秒调用一次Verificare(在tick方法中停止时间)，每次返回false时更新UI直到成功，然后告诉用户它已完成.

我个人从不使用睡眠.

You could pop a modal dialog (assuming winforms) after you launch the TITAN thing and wait until the file appears in Verificare().

I would start a timer after you launch Titan that calls Verificare every #n seconds (stopping the time in the tick method) and each time it returns false update the UI until success and then tell the user it has completed.

Personally I NEVER use sleep.

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