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Thread: How to redirect output of command called from OS_Shell()?

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  1. #1

    How to redirect output of command called from OS_Shell()?

    I have a simple TB script which is a console mode script.

    In it, I us OS_Shell() to call another program. That other program outputs text to the console.

    Unfortunately, the output of the other program messes up the nice pretty output of my TB script in it's console.

    Is there a way to call another program from within TB such that the other program's console output does NOT get added to the TB console output?

    Thanks!

    *Brian

  2. #2
    thinBasic author ErosOlmi's Avatar
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    Try redirect your shell command to NUL

    uses "OS"
    uses "console"
    
    
    OS_Shell("CMD.EXE /C DIR > NUL")
    WaitKey
    
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  3. #3
    Unfortunately, that appeared to have no effect. :-(

    Still get the extra output in my TB console.

    *Brian

  4. #4
    thinBasic author ErosOlmi's Avatar
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    Redirecting into a file?

    If possible send me e little example showing what you are doing to better understand.

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  5. #5
    Super Moderator Petr Schreiber's Avatar
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    Hello,

    I think you have to redirect both stderr and stdout.
    This could do it:
    uses "OS", "Console"
      
    OS_Shell("CMD.EXE /C dir > NUL 2>&1")
    WaitKey
    
    The 2>&1 looks strange, but it basically redirects stderr to stdout and that stdout you already send to NUL

    Let us know!


    Petr
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  6. #6
    Hmm. That's a great suggestion, unfortunately it doesn't seem to work either.

    Without TB at all, if I just do this from the command line:

    C:\Users\bschmalz>C:\PEMicro\cyclone_stmicro\sap_launch port=USB1 IMAGE=1
    Success
    
    C:\Users\bschmalz>
    
    It's the "Success" that I don't want. That's the output of the sap_launch.exe program.

    If I do:

    C:\Users\bschmalz>C:\PEMicro\cyclone_stmicro\sap_launch port=USB1 IMAGE=1 > NULL 2>&1
    
    C:\Users\bschmalz>
    
    Then the result of the sap_launch program is not printed to the console. That worked, right?

    Not so fast. When I do this from within TB:

        OutputText("Cycle " + Using$("####",x) + " reprogramming = ")
        ' Send command to Cyclone to reprogram motherboard
        lProgResult = OS_Shell("C:\PEMicro\cyclone_stmicro\sap_launch port=USB1 IMAGE=1 > NULL 2>&1", %OS_WNDSTYLE_HIDE, %OS_SHELL_SYNC)
        OutputText(lProgResult + ", ")
        Delay(250)
        OutputText("power on, ")
    
    I get the following output:
    Cycle    1 reprogramming = Success
    0, power on,
    
    so there is something special about running within TB as compared to just running in a normal cmd window. I have tried different values for the 'WindowStyle' parameter in OS_Shell() as well, with no change in effect.

    This is on a Win 7 Pro machine.

    This is *not* a big deal to me at all. It's purely a cosmetic thing in the output of my program. Everything is actually working just fine, it's just not as pretty as it could be.

    *Brian

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