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How to know if a html file has finished being written

I have a third party application, when it is executed (as a background process), it will write a html file.  User will open this html file, but how can I tell if this html file has finished being written (it takes about 5 minutes to write).  I guess I need "Please Wait .." page till it finish.

The third party application never close itself, I have to kill it after 10 minutes.  

Now I open this html file as a process, but I don't know how can I wait till it finish be written.

static void Main()
{
Process myProcess = new Process();
try
{
myProcess.StartInfo.WindowStyle= ProcessWindowStyle.Hidden;
myProcess.StartInfo.UseShellExecute = true;  
myProcess.StartInfo.FileName = "C:\\test.exe";
myProcess.Start();
Thread.Sleep(600000)  //wait 10 minutes and kill
myProcess.Kill();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}

Process p = new Process();
try
{
p.StartInfo.WindowStyle=ProcessWindowStyle.Maximized;
p.StartInfo.UseShellExecute=true;
p.StartInfo.FileName="C:\\download.html";
p.Start();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
0
ToneElec
Asked:
ToneElec
4 Solutions
 
Kent DyerIT Security Analyst SeniorCommented:
Simple: Put a Sleep for 300 seconds..

Complex: WMI (untested)
SELECT * FROM Win32_Process where Caption ='test.exe'

Open in new window


Now, some pseudocode..
If exist ProcessID, then Sleep 5 seconds

HTH,

Kent
0
 
ALaRivaCommented:
Could you check if the file exists?

Or does it reuse the same name over?
0
 
käµfm³d 👽Commented:
@ALaRiva

>>  Could you check if the file exists?

Depending on how the 3rd-party tool handles its files, that may or may not work. The tool could be flushing data to the file periodically, which cause it to exist, but it may not be finished actually writing the file.


@ToneElec

I would investigate why the 3rd party tool is not closing. Is this by design, or is it some flaw in the program. Also, there is Process.WaitForExit() rather than sleeping, but this won't have any effect if the process never terminates.
0
 
ALaRivaCommented:
@kaufmed,
Agreed. Flushing the Stream intermittently (from the 3rd party perspective) would be the appropriate method, IMO, so my solution wouldn't work. However, since they have a "flaw" of not closing the app or providing any feedback to the completion, maybe they didn't do it as such.

Either way, the OP has a few options, of which 1 should work.
0
 
wdosanjosCommented:
If the 3rd party application closes the file when it's done, then you should be able to identify that the file is complete by trying to get an exclusive lock on it.  

- If the file is not there then the process has not started;
- If the lock fails the file is still being written;
- If the lock succeeds the file is ready.

The code would be something like this:

bool isDone = false;
for (var i = 0; i < 120; i++)  // tries for 10 mins
{
    Thread.Sleep(5000); // 5 seconds
    try
    {
         var lock = File.Open("C:\\Download.html", FileMode.Open, FileAccess.Read, FileShare.None);
         isDone = true;
         lock.Close();
    }
    catch {}
}

if (isDone)
    Console.WriteLine("File is complete");
else
    Console.WriteLine("File generation failed");

Open in new window

0
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