fTrackDirectory (Function)

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Functions for managing external files

Constants for the external files

Functions for managing external files

Handling the external files

Storing files in Android

Summary table: Managing the application directories according to the platform

fDetectRemovableStorage

fReadLineRegularExpression

fRemoveDir

fRename

fReportsAndQueriesDir

Special cases
WLanguage procedure

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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, fTrackDirectory_Callback, 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 fTrackDirectory_Callback(sDirectoryName, sFileName, nAction, sOldFileName)
ExecuteMainThread(AddTable,sDirectoryName, sFileName, nAction, sOldFileName)

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

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, sOldFileName)

Syntax

<Result> = fTrackDirectory(<Directory to track> , <WLanguage procedure> [, <Modifications to notify> [, <Subdirectory>]])

<Result>: Boolean

True if the directory is tracked,
False otherwise. To get the details of the error, use ErrorInfo.

<Directory to track>: Character string (with quotes)

Full name of the directory to track.

<WLanguage procedure>: Procedure name

Name of the WLanguage procedure ("callback" procedure) that will be called when a change is detected in the specified directory.
For more details on this procedure, see Parameters of the procedure used by fTrackDirectory.

<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 some windows must be handled in threads (rare case). 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