check process if null in c# ?

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2.00/5 (4 votes)

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hello all
please i try to use this code to run process in c# windows application

C#

Process p = Process.Start(@"C:\Program Files\TeamViewer\Version7\TeamViewer", "-i 10.57.171.132 --Password P@ssw0rd");
            Thread.Sleep(500); // Allow the process to open it's window
            SetParent(p.MainWindowHandle, this.Handle);

but if Process P doesnt find the program i need it to go another path ..
the problem is i cant check if p is null , the code stop running if not found the correct path
?
help please :)

Posted 28-Apr-14 6:49am

sam9787

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Sergey Alexandrovich Kryukov · Accepted Answer · 2014-04-28T07:17:00

If no process has started, by whatever reason, this call really returns null (what else would you expect? :-): http://msdn.microsoft.com/en-us/library/vstudio/h6ak8zt5[^].

So, what's the problem, to check "if (p == null) …"? Nothing "stops running".

(This post the answer, not a question; everything is clear.)

—SA

Vedat Ozan Oner · Accepted Answer · 2014-04-28T08:05:00

Solution 2

maybe you can first check the existence of executable, then continue with process.
see here File.Exists[^]

string fullPath = @"full_exe_path"; // fullPath may change according to your design. like a parameter for a method, or a property of a helper class, or a constant value coming from an external configuration file.
if(File.Exists(fullPath)) {
  var p = Process.Start(fullPath);
  // ...
}

Posted 28-Apr-14 8:05am

Vedat Ozan Oner

Updated 28-Apr-14 9:19am

v3

Comments

Sergey Alexandrovich Kryukov 28-Apr-14 14:26pm

Of course, a 5, but, in addition to that, the Start can still be unsuccessful (permission problems or whatever), hence comparison to null. I answered on that.
(But the file name should never be repeated, should not be an immediate constant, but a variable/member or explicit constant (also not very useful for path names))
—S

Vedat Ozan Oner 28-Apr-14 15:16pm

thank you. you're right about your comment. I just tried to show a solution with 'File.Exists'. But, I will update it as you indicated.