Why can't you redirect in process.start? 1

[haddaway]

I am using these simple lines to start a defrag, but it fails if I add " > c:\test.txt". Why?

Dim ps As New ProcessStartInfo
ps.FileName = "C:\WINDOWS\system32\defrag.exe"
ps.Arguments = "-afv c: > c:\test.txt"

Process.Start(ps)

 

[earthandfire]

You need to use the startinfo structure, the properties are pretty self-explanatory and should lead you quickly to what you need.


Hope this helps.

 

[TipGiver]

I found this thread useful to me too and here is my try.
Hope you like it..

        Imports System.Diagnostics
        Imports System.IO

        Dim p As New Process
        Dim si As New ProcessStartInfo

        si.FileName = "cmd"
        si.CreateNoWindow = True
        si.RedirectStandardInput = True
        si.RedirectStandardOutput = True
        si.UseShellExecute = False

        p.StartInfo = si
        p.Start()

        Dim sr As StreamReader = p.StandardOutput
        Dim sw As StreamWriter = p.StandardInput

        sw.WriteLine("defrag.exe c: -a")
        sw.WriteLine("exit")

        Dim ofile As New StreamWriter("c:\t.txt")

        ofile.Write(sr.ReadToEnd)

        ofile.Close()
        sw.Close()
        sr.Close()

 

[haddaway]

thanks, I have no problem capturing the output, I just wonder why it breaks the process.start when using ">".

 

[TipGiver]

Well, it is NOT an argument. If i remember fine, the args are four. Using the '>' you redirect the "defrag c: -a" to the file "c:\t.txt". Typing it to the ms-prompt there is no problem.

 

[haddaway]

thanks for the information.

mvh Henrik