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Version: 2025

NULL values in HFSQL
WINDEV, WEBDEV and WINDEV Mobile allow you to manage the NULL value in the items of the HFSQL data files and for all the other types of accesses (Native, OLE DB, ...
Max (Function)
Returns the greatest value passed as parameter.
<ANSI string>.ToNum (Function)
Returns the numeric value of a character string. This feature enables you to perform numeric calculations on strings.
<Source>.BuildKeyValue (Function)
Builds the value of a composite key to implement a filter (HFilter) or to perform a search (HReadSeekFirst, HReadSeekLast, etc.).
HBuildKeyValueANSI (Function)
Whatever the platform used, the data stored in HFSQL data files is in ANSI format.
StringToNum (Function)
Returns the numeric value of a character string. This feature enables you to perform numeric calculations on strings.
HBuildKeyValue (Function)
Builds the value of a composite key to implement a filter (HFilter) or to perform a search (HReadSeekFirst, HReadSeekLast, etc.).
ChronoValue (Function)
Indicates the time elapsed (in milliseconds) since the call to ChronoStart.
LocalStorageGet (Function)
Retrieves a value from the local storage.
Val (Function)
Returns the numeric value of a character string.
Operations in a Select query
The query editor allows you to perform operations on the values of an item...
<Array>.Min (Function)
Returns the lowest value in the array.
Min (Function)
Returns the lowest value.
Data persistence
The data persistence is used to store the value typed by the user...
<Array>.Max (Function)
Returns the greatest value in the array.
Chart control properties
A Chart control can be used......
Native MySQL Connector: Specific features and remarks
Remarks and specific features of the Native MySQL Connector...
HFilter (Function)
Defines and enables a filter on a data file, view or query.
Error 112: An array can only have a maximum of X dimensions
SensorDetectChangeAcceleration (Function)
Notifies when acceleration forces are applied to the device along any of the three axes.
SystemIntegerToInteger (Function)
Converts a system integer to a 4-byte integer.
Container column in a Table control
A cell found in a Table control can contain a set of controls......
4. Conditional statements
WINDEV Tutorial - WLanguage basics Lesson 4 - Conditional statements - 20 min
Error 507: The '++' operator is not allowed
iInitInternalReport (Function)
Initializes the parameters of an internal report used by a report.
WLanguage procedure called by DialogAsynchronous
Procedure ("Callback") called by DialogAsynchronous when the user clicks one of the buttons...
SysErrorMode (Function)
Modifies the display mode of errors.
FinPaymentNb (Example)
Usage example of the FinPaymentNb function
Errors while managing data files
When an HFSQL function fails (returns False for example), the corresponding error number...
The TreeView Table control
The Treeview Table control is a cross between the Table control and the TreeView control......
Chart control: "Details" tab
Regardless of the editor (window, page or report), the "Details" tab found in the description...
docParagraph (Type of variable)
The docParagraph type is used to handle the characteristics of a paragraph in a DOCX document.
Error 123: The constant already exists
Error 531: The negative or null subscripts are not allowed
FinInterestRate (Example)
Usage example of the FinInterestRate function
grZoom (Function)
Defines the zoom of a chart.
Spacing out a selection of controls
To create modern interfaces, you need to increase spacing between the controls in your windows......
Assignment operators
Three assignment operators are available......
Creating a Pivot Table control
To create a Pivot Table control......
Content (Property)
The Content property is used to read or write the whole content of a control: List Box...