vb.net - Weird behavior of powercfg.exe when I execute it programatically -

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to programtically set display brightness had 2 options :

  • use powerwriteacvalueindex , powerwritedcvalueindex api
  • use powercfg.exe

now, tried both, , both gave me same (weird) result. here's code i'm using :

                psiinfo                     .filename = "powercfg"                     .useshellexecute = true                     .windowstyle = processwindowstyle.hidden                     .arguments = "-setacvalueindex " & guidcurscheme.tostring() & " " & subgroup_guid.guid_video_subgroup & " " & setting_guid.guid_dispbrightness & " " & psvalue.valueac                 end                 pproc = process.start(psiinfo)

where :

public const guid_video_subgroup string = "7516b95f-f776-4464-8c53-06167f40cc99" public const guid_dispbrightness string = "aded5e82-b909-4619-9949-f5d71dac0bcb"  public structure powersetting     public valueac string     public valuedc string end structure  dim psvalue powersetting

and guidcurscheme guid of active power scheme, returned powergetactivescheme api function. samething dc part, "-setdcvalueindex".

now weird behavior follow :

  1. if call code in button click handler event, set these values, not "general" screen brightness slider (and matter, display brightness). (somebody edits pictures links inside post please)
  2. if user clicks button second time, apply setting.
  3. if put code in loop run twice when user click button, still behave in (1)
  4. if try run same command manually command-line, run work fine.

this totally unexpected, don't know i'm doing wrong. gives exact same result when use powerwriteacvalueindex , powerwritedcvalueindex functions windows api.

maybe double-check syntax of argument letting app copy string clipboard. tiny typo ruins me.

also i'd check if application gets called 1 syswow or system32 (that depends on how compile app) can check exitcode or @ error-output get. error-output can captured this:

dim system.io.streamreader         dim se system.io.streamreader         se = myproc.standarderror         = myproc.standardoutput         myproc.waitforexit()         msgbox(so.readtoend & vbcrlf & se.readtoend)

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