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System.Diagnostics.ProcessStartInfo with string arguments

fantamen
fantamen asked
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Last Modified: 2012-03-12
I've to pass to  a cmd file 2 arguments: the first is a number and the second is a description string containing spaces.
My code looks like this ...
Dim psi As System.Diagnostics.ProcessStartInfo = New System.Diagnostics.ProcessStartInfo
        psi.FileName = "C:\Test.cmd"
        psi.Arguments = Par_Arguments
        psi.WindowStyle = ProcessWindowStyle.Normal
        System.Diagnostics.Process.Start(psi)

Par_Arguments is the variable that contain the 2 arguments.
My trouble is what I have to do to build the second string argument with spaces.
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Since you don't have specified the value of Par_Arguments value I think it is something like this:
Par_Arguments = "5     "

Use the following instead:
Par_Arguments = "5 \"     \""
What does the assignment statement of Par_Arguments look like?

Author

Commented:
The value of Par_Arguments can be for example "2 Messaggio di prova" where the first parameter is "2" and the second "Messaggio di prova".
In that case, petr_hlucin's answer is what you need. it would look like this:

Par_Arguments = "2 \"Messaggio di prova\""

The reason you need this is that Windows splits your argument string by spaces, so your raw text gets passed as 4 different arguments instead of two. That means you need to surround the second argument with quotes, and the only way to do that in VB is to use the escape sequence for quotes, which is \".

Buona Fortuna, mi amici.

Author

Commented:
If I write
Par_Arguments = "2 \"Messaggio di prova\""
the compiler returns end of statements expected...
Éric MoreauSenior .Net Consultant
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Top Expert 2016

Commented:
vb escape char is not \, it is "

try this:

Par_Arguments = "2 ""Messaggio di prova"""
I'm sorry, I was confused with C#. To escape quotes in VB, use two in a row like this:

Par_Arguments = "2 ""Messaggio di prova"""

Author

Commented:
Now code is compiled correct but I'm investigating for a bad response from .cmd file.
It run correctly only if second parameter don't contain spaces.
Éric MoreauSenior .Net Consultant
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Top Expert 2016

Commented:
I think I already had this problem. try doubling them once more:


        Par_Arguments = "2 """"Messaggio di prova"""""

Author

Commented:
Using your assignment the second parameter is evalueted partially, only until "Messaggio" and the substring " di prova" is discarded.
Éric MoreauSenior .Net Consultant
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Top Expert 2016

Commented:
can you try:


        Par_Arguments = "2 " + Chr(34) + "Messaggio di prova" + Chr(34)

Author

Commented:
I've tried before opening the thread in expert exchange but 2 parameter was discarded e not recognized.

Author

Commented:
Good. Now probably I've found the reason: in batch file there is this line:
if "x%1"=="x" goto Missing_Severity

I've replaced with

if [%1]==[] goto Missing_Severity

... and now all works correctly.

Can you confirm my change is correct?


Thanks
Senior .Net Consultant
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Top Expert 2016
Commented:
Sincerely, i can't really but since you tested it and it is working properly, you should consider it as good.

Author

Commented:
To solve was necessary not only batch modifcations but your indications too. So thank you very match!.