Get 4D folder

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4D v19.8

Get 4D folder


Get 4D folder {( folder {; *} )} -> Function result

Parameter	Type	Description
folder	Longint	Folder type (if omitted = active 4D folder)
*	Operator	Return folder of host database
Function result	String	Pathname to 4D Folder

Description

The Get 4D folder command returns the pathname to the active 4D folder of the current application, or to the 4D environment folder specified by the folder parameter, if passed. This command allows you to get the actual pathname of the folders used by the 4D application. By using this command, you ensure that your code will work on any platform running any localized system.

In folder, you can pass one of the following constants, which are located in the "4D Environment" theme:

Constant	Type	Value
4D Client database folder	Longint	3
Active 4D Folder	Longint	0
Current resources folder	Longint	6
Data folder	Longint	9
Database folder	Longint	4
Database folder Unix syntax	Longint	5
HTML Root folder	Longint	8
Licenses folder	Longint	1
Logs folder	Longint	7
MobileApps folder	Longint	10

You will find below a description of each folder:

Preliminary notes about folder names:

{Disk} is the disk where the system is installed.
The word User represents the name of the user that opened the session.

Active 4D Folder

The 4D environment uses a specific folder to store the following information:

Preferences files used by the 4D environment applications
Shortcuts.xml file (custom keyboard shortcuts)
Macros v2 folder (macro commands of Method editor)
Favorites v1x folder, for example Favorites v13 (pathnames for local and remote databases that have been opened)
Logs folder for maintenance logs and when the data is read-only

The active 4D folder is created by default at the following location:

On Windows 7 and higher: {Disk}:\Users\<userName>\AppData\Roaming\
On macOS: {Disk}:Users:<userName>:Library:Application Support:

Licenses Folder

Folder containing the Licenses files of the machine.
The Licenses folder is placed at the following location:

On Windows 7 and higher: {Disk}:\ProgramData\4D\Licenses
On OS X: {Disk}:Library:Application Support:4D:Licenses

Notes:

In the case of an application merged with 4D Volume Desktop, the licenses folder is included in the package of the application.
If the licenses folder cannot be created in the system because of a lack of authorization, it is created at the following locations:
- On Windows 7 and higher: {Disk}:\Users\<userName>\AppData\Roaming\4D\Licenses
- On OS X: {Disk}:Users:<userName>:Library:Application Support:4D:Licenses

Data Folder

Path of the folder containing the current data file. The pathname is expressed using the standard syntax of the current platform.

4D Client Database Folder (Client machines)

4D database folder created on each 4D client machine for storing files and folders related to the database (resources, plug-ins, Resources folder, etc.).
The 4D Client Database Folder is placed at the following location on each client machine:

On Windows: {Disk}:\Users\<userName>\AppData\Local\4D\<databaseName_Address_Port_key>
On macOS: {Disk}:Users:<userName>:Library:Caches:4D:<databaseName_Address_Port_key>

Note: The key value is incremented (and the 4D database local folder duplicated) when another instance of the client application is launched simultaneously on the same machine.

Database Folder

Folder containing the database structure file. The pathname is expressed using the standard syntax of the current platform.
With the 4D Client application, this constant is strictly equivalent to the previous 4D Client database folder constant: the command returns the pathname of the folder created locally.

Database Folder Unix Syntax

Folder containing the database structure file. This constant designates the same folder as the previous one but the pathname returned is expressed using the Unix syntax (Posix), of the type /Users/... This syntax is mainly used when you use the LAUNCH EXTERNAL PROCESS command under OS X.

Current Resources folder

Resources folder of the database. This folder contains the additional items (pictures, texts) used for the database interface. A component can have its own Resources folder.

In client/server mode, this folder can be used to organize the transfer of custom data (pictures, files, subfolders, etc.) between the server machine and the client machines. The contents of this folder are automatically updated on each client machine when it connects. All referencing mechanisms associated with the Resources folder are supported in client/server mode (.lproj folder, XLIFF, pictures, and so on). In addition, 4D provides various tools that can be used to manage and update this folder dynamically, more particularly a resources explorer.

Notes:

If the Resources folder does not exist for the database, executing the Get 4D folder command with the Current resources folder constant will create it.
On Windows, in merged client projects, the location of this folder is modified if the ShareLocalResourcesOnWindowsClient BuildApp key is used.

Logs Folder

The Logs folder of the database, located at the same level as the data file. This folder centralizes the following log files of the current database:

database conversion,
Web server requests,
backup/restore activities journal,
command debugging,
4D Server requests (generated on client machines and on the server).

Notes:

An additional Logs folder, located in the system user preferences folder (Active 4D Folder), is used for maintenance log files (compact, verify, repair). It recommended to call Get 4D file(Compacting log file) for example when you want to access such log files. This Logs folder is also used in cases where regular Logs folder cannot be written.
If the Logs folder does not exist for the database, executing the Get 4D folder command with the Logs folder constant will create it in the appropriate location.

HTML Root Folder

Current HTML root folder of the database. The pathname returned is expressed with the standard syntax of the current platform. The HTML root folder is the folder in which the 4D Web server looks for the requested Web pages and files. By default, it is named WebFolder and is placed next to the structure file (or its local copy in the case of 4D in remote mode). Its location can be set on the Web/Configuration page of the Preferences or dynamically via the WEB SET ROOT FOLDER command.

If the Get 4D folder command is called from a remote 4D, the path returned is that of the remote machine, not that of 4D Server.

The optional * parameter is useful in the case of an architecture using components: it can be used to determine the database (host or component) for which you want to get the folder pathname. This parameter is only valid for Database folder, Database folder UNIX syntax and Current resources folder folders. It is ignored in all other cases.
When the command is called from a component:

If the * parameter is passed, the command returns the pathname of the host database folder,
If the * parameter is not passed, the command returns the pathname of the component folder.
The database folder (Database folder and Database folder UNIX syntax) returned differs according to the type of the component architecture:
- In the case of a .4dbase folder/package, the command returns the pathname of the .4dbase folder/package,
- In the case of a .4db or .4dc file, the command returns the pathname of the “Components” folder,
- In the case of an alias or shortcut, the command returns the pathname of the folder containing the original matrix database. The result differs according to the format of this database (.4dbase folder/package or .4db/.4dc file), as described above.
When the command is called from the host database, it always returns the pathname of the host database folder, regardless of whether or not the * parameter is passed.

MobileApps Folder

Folder containing all existing session files (.json) used by the 4D application to reference mobile app user sessions (i.e. sessions from 4D for iOS apps). Session files are grouped in application subfolders and are automatically created. For more information, please refer to the 4D for iOS documentation.

This folder is located at the same level as the current 4D data file.

Example 1

During the startup of a single-user database, you want to load (or create) your own settings in a file located in the 4D folder. To do so, in the On Startup database method, you can write code similar to this:

 $vsPrefDocName:=Get 4D folder+"MyPrefs.prf" //Build pathname to the Preferences file

  // Check if the file exists

 If(Test path name($vsPrefDocName)#Is a document)

    $vtPrefDocRef:=Create document($vsPrefDocName.prf) //If not, create it

 Else

    $vtPrefDocRef:=Open document($vsPrefDocName.prf) //If so, open it

 End if

 If(OK=1)

  //Process document contents

    CLOSE DOCUMENT($vtPrefDocRef)

 Else

  //Handle error

 End if

Example 2

This example illustrates the use of the Database folder UNIX syntax constant under Mac OS to list the contents of the database folder:

 $posixpath:="\""+Get 4D folder(Database folder Unix syntax)+"\""

 $myfolder:="ls -l "+$posixpath

 $in:=""

 $out:=""

 $err:=""

 LAUNCH EXTERNAL PROCESS($myfolder;$in;$out;$err)

Note: Under Mac OS, it is necessary to put pathnames in quotes when they contain the names of files or folders with spaces in them. The escape sequence "\" can be used to insert the quotation mark character into the string. You can also use the statement Char(Double quote).

System variables and sets

If the folder parameter is invalid or if the pathname returned is empty, the OK system variable is set to 0.