fTrackDirectory (Function)

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Functions for managing external files

See also

fTrackDirectory (Function)

In french: fSurveilleRépertoire

Detects the modifications performed on the content of a directory. Only the modifications performed on the files found in the directory are detected. In case of modification, a specific procedure is run in a thread.

Example

// Name of directory to track
sDirectoryName is string = "C:\Temp\MyDir"
// The ProcessDirModification procedure will be called
// whenever a file or directory found in the "C:\Temp\MyDir" directory is modified.
IF fTrackDirectory(sDirectoryName, ProcessDirModification, ftCreateFile ...
+ ftModifyFile + ftDeleteFile + ftRename) THEN
// Inform the user that the directory will be tracked
Info("The " + sDirectoryName + " directory will be tracked.")
ELSE
// Inform the user that the directory will not be tracked
Info("The " + sDirectoryName + " directory will not be tracked.")
END

// Code of the procedure
PROCEDURE ProcessDirModification(sDirectoryName, sFileName, nAction, sFormerFileName)
ExecuteMainThread(AddTable,sDirectoryName, sFileName, nAction, sFormerFileName)

// Procedure that acts on the main thread
PROCEDURE AddTable(sDirectoryName, sFileName, nAction, sFormerFileName)

sActionDesignation is string
// The designation of the action depends on nAction
SWITCH nAction
CASE ftCreateFile: sActionDesignation = "Creating files"
CASE ftDeleteFile: sActionDesignation = "Deleting files"
CASE ftModifyFile: sActionDesignation = "Modifying files"
CASE ftRename: sActionDesignation = "Renaming files"
END
// Add a line containing the information about the modification
// into the TABLE_MODIFICATIONS table
TableAddLine(TABLE_MODIFICATIONS, sDirectoryName, sFileName, , ...
sActionDesignation, sFormerFileName)

Syntax

<Result> = fTrackDirectory(<Directory name> , <Procedure name> [, <Modifications to notify> [, <Subdirectory>]])

<Result>: Boolean

True if the directory is tracked,
False otherwise. To find out the error details, use ErrorInfo.

<Directory name>: Character string (with quotes)

Full name of the directory to track.

<Procedure name>: Character string (with or without quotes)

Name of the WLanguage procedure ("callback" procedure) that will be called when a change is detected in the specified directory.
This procedure has the following format:

PROCEDURE <Procedure name>(<Name of tracked directory>
[, <Name of modified element>
[ <, <Action> [, <Former name>])

where:
<Name of tracked directory>: character string corresponding to the full name of the tracked directory.
<Name of modified element>: chaaracter string indicating the name of the modified file or directory.
<Action>: Integer constant that can take the following values:
ftCreateFile The <Name of modified element> file or directory was created in <Directory>.
ftModifyFile The <Name of modified element> file or directory was modified in <Directory>.
ftRename The <Name of modified element> file or directory was renamed in <Directory>.
ftDeleteFile The <Name of modified element> file or directory was deleted from <Directory>.
<Former name>: Former name of the modified file or directory if the action performed is a rename operation.
Versions 22 and later
Remark: This procedure can be an internal procedure.
New in version 22
Remark: This procedure can be an internal procedure.
Remark: This procedure can be an internal procedure.

<Modifications to notify>: Optional Integer constant (or combination of constants)

Modifications performed in the content of the directory to track and for which the procedure must be run:
ftCreateFile Creating a file or a directory.
ftModifyFile Modifying a file or a directory.
ftRename Renaming a file or a directory.
ftDeleteFile Deleting a file or a directory.
ftAll All the possible actions will be tracked. Corresponds to ftCreateFile + ftModifyFile + ftRename + ftDeleteFile.

<Subdirectory>: Boolean

True (default value) to process the sub-directories.
False otherwise.

Remarks

Special cases

fTrackDirectory tracks the directory content only. The changes of directory name or location are ignored.
To stop tracking the directory, use fTrackStop and fTrackStopAll.
To track the modifications performed in a file, use fTrackFile.
Limitation: Only 5 directories can be tracked at the same time.

WLanguage procedure

The WLanguage procedure is run in a WLanguage thread.
Caution: The following processes cannot be run in the threads:

opening windows with WLanguage functions such as Open, Use, Close, ... A specific management mode must be implemented if windows must be handled in the threads (very rare). See Managing the opening of a window in a secondary thread for more details.
managing events.
managing timers.

See Managing threads for more details.

Component : wd250std.dll