HChangeLocation (Function)

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Why include the data files in a library?

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Why include the data files in a library?

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Functions for HFSQL management

HChangeLocation (Function)

In french: HChangeLocalisation

Available only with these kinds of connection

Modifies the search mode of physical data files (.FIC, .NDX, ...). By default, the physical data files are sought in the application library then on disk.

Reminder: The physical data files can be found:

on disk (most common case).
in the WINDEV libraries (WDL files).
in the executable.
in a component.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Remark: From version 19, HFSQL is the new name of HyperFileSQL.

Versions 22 and later

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

New in version 22

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

Example

// Searching for data files in libraries 4, 6 and 9
HChangeLocation(CustomerFile, hWDL, 4, 6, 9)

Syntax

<Result> = HChangeLocation(<Data file> , <Search mode> [, <Parameters>])

<Result>: Boolean

True if the operation was performed,
False if a problem occurred. HError is used to identify the error.
If HChangeLocation is used, <Result> = True but the function has no effect: the data files used are always found on the server.

<Data file>: Character string (with or without quotes)

Name of data file (defined in the analysis).
If this parameter is equal to "*", the change in search mode will be applied for all known data files (described in the analysis).
Caution: the affected data files are automatically closed.
This parameter can also correspond to the name of a group of files (or custom-folder) defined in the analysis.

<Search mode>: Constant

Configures the search mode of data files:
hDisk The data files are sought on disk only. This is the most common case.
hWDL
(Default value) The data files are sought:
In the main WDL;
If <Parameter> is not specified: Searches for the data files in the WDLs according to the load order, then on disk.
If <Parameter> is specified: Searches for the data files in the specified WDLs, then on disk.
In the main WDL of the component.
In the secondary WDLs of the component according to the load order.

<Parameters>: Optional character string (with quotes)

Identifier of the WDLs where the search must be performed. These WDLs must be loaded by LoadWDL that returns the identifier of the WDL.

Remarks

Why include the data files in a library?

Including the data files in a library presents the following benefits:

protecting data: the data files are accessible in read-only.
grouping data: all the files required by the execution are grouped in a single file.

Component : wd250hf.dll