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  • Syntaxes according to the values to convert
  • Using HConvertX (method kept for backward compatibility with WINDEV 5.5)
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Stored procedures
HConvertX (Function)
In french: HConvertX
HFSQLHFSQL Client/ServerAvailable only with these kinds of connection
Converts a numeric value into a binary string in order to perform a search on a numeric key. Used to build a composite key from one or more numeric items.
File description in the data model editor
HBuildKeyValue must be used to perform searches on the composite keys for data files that use "Mode 7" to manage spaces in text items. For more details, see Composite keys.
These functions are kept for backward compatibility to migrate the applications developed in WINDEV 5.5 and WEBDEV 1.5.
Remark: From version 19, HFSQL is the new name of HyperFileSQL.
// CompKey is made of PRODREF (text) and QTY (integer)
// EDT_Quantity and EDT_ProductRef are two edit controls
Srch is string
HConvertE(Search, EDT_Quantity)
Srch = Complete(EDT_ProductRef, 8) + Srch
HReadSeek(Orders, CompKey, Srch)
<Result> = HConvertX(<Text Variable> , <Numeric Value>)
<Result>: Boolean
  • True if no problem occurred,
  • False if an error occurred. HError is used to identify the error.
<Text Variable>: Ansi Character String variable
Variable to which the conversion result will be assigned. This variable must have a sufficient size and it will be filled with space characters.
<Numeric Value>: Numeric variable or numeric value
Value to convert.

Syntaxes according to the values to convert

HConvertC(<string>,<Short integer>)
HConvertD(<string>,<Double real>)
HConvertE(<string>,<Integer>)For backward compatibility with WEBDEV 1.5, this function handles integer_55 on 2 bytes.
HConvertL(<string>,<Long integer>)We recommend that you use HBuildKeyValue.
HConvertP(<string>,<Turbo real>)For backward compatibility with earlier versions, this function is identical to HConvertD.
HConvertR(<string>,<Simple real>)
HConvertU(<string>,<Unsigned integer>)For backward compatibility with earlier versions, this function handles integer_55 on 2 bytes.
HConvertV(<string>,<Signed 1-byte integer>)
Tip: It is recommended to use Convert instead of HConvertX since it is much easier to manipulate.

Using HConvertX (method kept for backward compatibility with WINDEV 5.5)

To build the value of a composite key without using HBuildKeyValue, you must:
  • entirely fill the text components with the hMinVal constant.
  • convert the numeric components with HConvert.
MyCompositeKey = Complete(Customer.LastName, Dimension(Customer.LastName), hMinVal) + ...
Complete(Customer.FirstName, Dimension(Customer.FirstName), hMinVal)
  • The hMinVal constant is equivalent to Charact(0).
  • The hMaxVal constant is equivalent to Charact(255).
For more details on how to use composite keys on filters, see Composite keys and filters.
Component: wd270hf.dll
Minimum version required
  • Version 9
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