4D v14.3

SET ENVIRONMENT VARIABLE

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4D v14.3
SET ENVIRONMENT VARIABLE

SET ENVIRONMENT VARIABLE 


 

SET ENVIRONMENT VARIABLE ( varName ; varValue ) 
Parameter Type   Description
varName  String in Variable name to set
varValue  String in Value of the variable or "" to reset default value

The SET ENVIRONMENT VARIABLE command allows you to set the value of an environment variable under Mac OS X and Windows. It is meant to be used with the  LAUNCH EXTERNAL PROCESS command. It also works with the PHP Execute command.

Pass the name of the variable to define in varName and its value in varValue.

  • To get the general list of environment variables and possible values, please refer to the technical documentation of your operating system.
  • To see the list of environment variables available with the LAUNCH EXTERNAL PROCESS command, please refer to the documentation for this command. Note that three specific environment variables are available for use in this context:
    _4D_OPTION_CURRENT_DIRECTORY: Used to set the current directory of the external process to be launched. In varValue, you must pass the pathname of the directory (HFS type syntax on Mac OS and DOS on Windows).
    _4D_OPTION_HIDE_CONSOLE (Windows only): Used to hide the window of the DOS console. You must pass "true" in varValue to hide the console or "false" to display it.
    _4D_OPTION_BLOCKING_EXTERNAL_PROCESS: Used to execute the external process in asynchronous mode, in other words, non-blocking for other applications. You must pass "false" in varValue to set an asynchronous execution or "true" to set a synchronous execution (no default value can be set for this variable).
    These variables are valid in the current process for the next call to LAUNCH EXTERNAL PROCESS.

Example  

Refer to examples of the LAUNCH EXTERNAL PROCESS command.

 
PROPERTIES 

Product: 4D
Theme: Tools
Number: 812

 
HISTORY 

Modified: 4D v11 SQL

 
SEE ALSO 

_o_SET CGI EXECUTABLE
LAUNCH EXTERNAL PROCESS

 
ARTICLE USAGE

4D Language Reference ( 4D v14 R2)
4D Language Reference ( 4D v13.5)
4D Language Reference ( 4D v14 R3)
4D Language Reference ( 4D v14.3)
4D Language Reference ( 4D v14 R4)

Inherited from : SET ENVIRONMENT VARIABLE ( 4D v12.4)