Chip,
The technique that Dave Batton used in Foundation (and released publicly in
a couple of free components) went like this:
Start most methods with a call to the INIT method:
Eg.
// ----------------------------------------------------
// Project Method: Log_Init
// Initializes both the process and interprocess variables used by
// the logging routines.
// Access: Private
// Parameters: None
// Returns: Nothing
// Created by Dave Batton on May 25, 2004
// ----------------------------------------------------
C_BOOLEAN(<>Log_Initialized_b; Log_Initialized_b)
If (Not(<>Log_Initialized_b)) // So we only do this once.
Compiler_Log
// Do Application wide initialisation here
End if
If (Not(Log_Initialized_b)) // So we only do this once.
Compiler_Log
// Do process wide initialisation here
End if
The Compiler method would look like this:
// ----------------------------------------------------
// Project Method: Compiler_Log
// Compiler variables related to the Foundation Log routines.
// Access: Private
// Parameters: None
// Returns: Nothing
// Created by Dave Batton on Jul 26, 2003
// ----------------------------------------------------
// Interprocess Variables
C_BOOLEAN(<>Log_Initialized_b)
If (Not(<>Log_Initialized_b)) // So we only do the IP variables once per
application launch
// Declare all IP vars here
C_TEXT(<>Log_Path_t;<>Log_RecordDelimiter_t)
C_LONGINT(<>Log_Platform_i)
End if
// Process Variables
C_BOOLEAN(Log_Initialized_b)
If (Not(Log_Initialized_b)) // So we only do the process variables once
per process
// Declare all process vars here
ARRAY TEXT(Log_Messages_at;0)
End if
// Parameters
If (False) // So we never run this as code.
C_TEXT(Log_AddEntry ;${1})
C_BOOLEAN(Log_Enable ;$0;$1)
C_TEXT(Log_FileName ;$0;$1)
C_TEXT(Log_Info ;$0;$1)
C_TEXT(Log_Path ;$0)
C_LONGINT(Log_PositionR ;$0)
C_TEXT(Log_PositionR ;$1;$2)
End if
Since then we now have a new database method: On Host Database Event
database method
This was introduced in v14 and you can initialise your component here, as
well as starting any methods/processes automatically.
http://doc.4d.com/4Dv14/4D/14.4/On-Host-Database-Event-database-method.301-2511007.en.html
The _Init method still works of course.
Regards,
Wayne
[image: --]
Wayne Stewart
[image: http://]about.me/waynestewart
<http://about.me/waynestewart>
On 29 April 2017 at 04:17, Chip Scheide via 4D_Tech <[email protected]>
wrote:
> do I need to initialize the component's IP, or process variables in
> every process or just once at startup of the host database?
>
> Thanks
> Chip
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