fCompress (Function)

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Operating mode in Windows Vista (and later)

Gauge

See also

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

Error codes
Operating mode in Windows Vista (and later)
Gauge

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WEBDEV

WINDEV Mobile

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See also

fCompress (Function)

In french: fCompacte

Compresses a file. This file can be decompressed by fUncompress.

Remark: The small-size files are not likely to be compressed.

Reminder: Archiving functions (zipXXX functions) allow to manage archives in ZIP, CAB, 7z, etc.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

See additional examples

// Compress a file
Res = fCompress("C:\Directories\File.txt", "C:\Directories\CompressedFile.txt")

Syntax

<Result> = fCompress(<Path of file to compress> , <Path of compressed file>)

<Result>: Integer

0 if the compression was performed,
an error code (value greater than 0) otherwise.

<Path of file to compress>: Character string (with quotes)

Name and full (or relative) path of the file to compress (up to 260 characters). A UNC path can be used.

<Path of compressed file>: Character string (with quotes)

Name and full (or relative) path of compressed file (up to 260 characters). A UNC path can be used.

Remarks

Error codes

The following error codes are returned:

1: The file to compress cannot be opened.
2: Unable to create the compressed file. This error occurs if <Path of compressed file> does not exist.
4: The file cannot be compressed: the file is copied (the size of the file to compress is too small for instance).
5: Insufficient memory to perform the compression.
6: The compression was canceled by the user: fStopCompress has been run.
7: Insufficient space to create the compressed file.

The message corresponding to the error code is returned by ErrorInfo with the errMessage constant.

Operating mode in Windows Vista (and later)

If this function does not operate properly in Windows Vista (and later), check whether the file or directory used is not in one of the system directories (Windows directory or "Program Files" directory).

Indeed, in Windows Vista (and later), with the UAC mechanism (User Account Control) enabled, you must have the administrator privileges to handle and/or modify the files or directories in the system directories (Windows directory or "Program Files" directory).

Programming tip: To handle and/or modify the files or directories without administrator privileges, you should:

avoid writing into the Windows directory or into the "Program Files" directory,
use the system directory corresponding to the application (returned by SysDir associated with the srCommonAppData constant).

Gauge

To view the progress of file compression, use Event to process the GaugeCompaction message (1174). When this message is received, the _EVE.wParam variable contains the percentage of file compression.

Component : wd250std.dll