fCreate (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

Help / WLanguage / WLanguage functions / Standard functions / External file functions

Handling errors
Operating mode in Windows Vista (and later)

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

fCreate (Function)

In french: fCrée

Creates an external file. This file is automatically opened in read/write.

Remarks:

To handle text external files, we recommend that you use fLoadText/fSaveText and fLoadBuffer/fSaveBuffer.
To handle binary external files, we recommend that you use fCreate or fOpen.

Example

See additional examples

// Create the external file
ResCreation = fCreate("C:\MyDirectories\File.txt")
IF ResCreation <> -1 THEN 
	...
END

// Create the external file
MyFile is DiskFile
ResOpen = fCreate("C:\MyDirectories\File.txt")
IF NOT ErrorOccurred THEN
	...
END

// Create the external file
ResOpening is boolean
MyExternalFile is DiskFile
ResOpen = fCreate(MyExternalFile, "C:\MyDirectories\File.txt")
IF NOT ErrorOccurred THEN
	...
END

Syntax

Creating an external file Hide the details

<Result> = fCreate(<File path> [, <Creation options>])

<Result>: Integer

an integer:
the identifier of the external file. This identifier will be used by all the functions for handling external files.
-1 if an error occurred. To get more details on the error, use ErrorInfo with the errMessage constant.
a variable of type DiskFile. If an error occurs, the ErrorOccurred variable is set to True. To get more details on the error, use ErrorInfo with the errMessage constant.

<File path>: Character string

Name and full or relative path of the file (up to 260 characters). The extension of the file can be specified. By default, if the file extension is not specified, the external file will have no extension. A UNC path can be used.
Note: If the external file already exists (same directory and same name), this file is deleted and recreated.. To avoid deleting an existing file, use fOpen associated with the foCreateIfNotFound constant.

<Creation options>: Combination of optional constants

Options for creating the file:
Blocking options: A block can be set when the external file is opened:
foAutomaticDeletion The file is locked when opened, and will be automatically deleted when closed (when fClose is called, or when the application is closed).
If multiple applications are using the file, it will be automatically deleted when the last application closes it (when fClose is called, or at the end of the application).
foReadLock The file will be created in read-only. The other applications that use this file will not be able to read it.
foWriteLock The file will be created in write-only. The other applications that use this file will not be able to modify it.

Type of external file to create. This type is used by fReadLine and fWriteLine to define the type of information to read and write in the external file:
foAnsi Ansi file. This constant is used to manage an Ansi file when the "Use Unicode strings at runtime" mode is enabled in the project configuration.
This mode is used by default in the WINDEV and WEBDEV projects.
foUnicode Unicode file. This constant is used to manage a Unicode file when the "Use Ansi strings at runtime" mode is enabled in the project configuration.
This mode is used by default in WINDEV Mobile projects.

By default, if no constant is specified:
the external file can be freely accessed by the other applications,
the type of the file corresponds to the default mode.

Remarks

Handling errors

fCreate throws an error in the following cases:

the file is locked by another computer or by another application,
the user has no write rights in the creation directory.
a Unicode string was used for <File path> in an operating system such as Windows 98 or Windows Me.

Operating mode in Windows Vista (and later)

If this function does not work 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).

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

Programming tip: If you need to manipulate / modify files or directories, without needing administrator privileges, it is advisable:

avoid writing to the Windows directory or to the "Program Files" directory,
use the system directory of the application (returned by SysDir with the srAppDataCommun constant, for example).

Remark: Under Windows Vista (and higher), the virtualization mechanism makes applications Vista-compatible.. If the file is created in a system directory without having sufficient rights, this file will actually be created in another directory (C:\Users\<LOGIN>AppData\Local\VirtualStore\Windows\). In this case, the file cannot be shared between several applications.

Related Examples:

Unit examples (WINDEV): Handling text files

[ + ] Handling "text" files with WINDEV:
- Create a text file
- Write into a text file
- Read in a text file

Unit examples (WEBDEV): Handling text files

[ + ] This example explains how to handle "non HFSQL" files with WEBDEV and it allows you to:
- Create a text file
- Write into a text file
- Read in a text file

Unit examples (WINDEV Mobile): Handling text files

[ + ] Handling external "text" files:
- Create a text file
- Write into a text file
- Read in a text file

Business / UI classification: Business Logic

Component: wd300std.dll