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Resolved Set an environment variable

  1. How-to
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  1. Gimmy Susan
    Gimmy Susan
  2. PowerBuilder
  3. Monday, 11 July 2022 12:26 PM UTC

Good morning community
I need to set an environment variable and read it later.


I found: www://https://codeverge.com/sybase.powerbuilder.general/creating-setting-environment-vari/954332

 

I try to set it:

FUNCTION boolean SetEnvironmentVariableA (string szName, string szValue) LIBRARY "kernel32.dll" boolean lb_ret
lb_ret = SetEnvironmentVariableA ("Key", "Value")

 

If I try to read it:

ContextKeyword lcxk_base
string ls_Path
string ls_values ​​[]
GetContextService ("Keyword", lcxk_base)
GetContextService ("ContextKeyword", lcxk_base)
lcxk_base.GetContextKeywords ("Keyword", ls_values)
IF Upperbound (ls_values)> 0 THEN
ls_Path = ls_values ​​[1]
ELSE
ls_Path = "* UNDEFINED *"
END IF

 

The result is always "* UNDEFINED *"


Any suggestions ?

Thanks in advance for the help.

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Accepted Answer
René Ullrich
René Ullrich Accepted Answer Pending Moderation
  1. Monday, 11 July 2022 12:57 PM UTC
  2. PowerBuilder
  3. # Permalink

Seems that context keyword service can't read the environment variables your write with SetEnvironmentVariable.

In documentation for SetEnvironmentVariable you will find: "This function has no effect on the system environment variables or the environment variables of other processes." Maybe this is the reason? I don't know.

What will work:

 

FUNCTION boolean SetEnvironmentVariableW (string szName, string szValue) LIBRARY "kernel32.dll"
FUNCTION long GetEnvironmentVariableW (string szName, ref string szValue, long size) LIBRARY "kernel32.dll"

// set a value
SetEnvironmentVariableW ("Key", "Value")

// read a value
ls_value = Space (1000)
GetEnvironmentVariableW ("Key", ls_value, 1000)
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Responses (4)
Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Tuesday, 12 July 2022 09:34 AM UTC
  2. PowerBuilder
  3. # 1

If you want to set an environment variable that "sticks" on the system, not just for the session of your running app, then you might want to consider doing a 

Run("SETX ......).

regards,

MiguelL

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Roland Smith
Roland Smith Accepted Answer Pending Moderation
  1. Monday, 11 July 2022 16:23 PM UTC
  2. PowerBuilder
  3. # 2

Also of note, SetEnvironmentVariable only updates the process' copy of the environment. It does not update the system environment.

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René Ullrich
René Ullrich Accepted Answer Pending Moderation
  1. Monday, 11 July 2022 12:40 PM UTC
  2. PowerBuilder
  3. # 3

Hi Gimmy,

SetEnvironmentVariableA ist for Ascii, you should better user SetEnvironmentVariableW.

in your example you set the Variable "Key" but read the variable "Keyword"!

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