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  • Sorting the memory zone
  • Existence of memory zone
  • Performing a search in a memory zone
  • Equivalence
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WEBDEV
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WINDEV Mobile
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Others
Stored procedures
Warning
From version 20, this feature is kept for backward compatibility. We recommend that you use the Associative arrays.
Positions on the element found before the current element of a memory zone and returns the value of this element.
Versions 15 and later
Android This function is now available for the Android applications.
New in version 15
Android This function is now available for the Android applications.
Android This function is now available for the Android applications.
Versions 17 and later
iPhone/iPad This function is now available for the iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for the iPhone/iPad applications.
iPhone/iPad This function is now available for the iPhone/iPad applications.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
Android Widget This function is now available in Android Widget mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Android Widget This function is now available in Android Widget mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Android Widget This function is now available in Android Widget mode.
Versions 22 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 22
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Example
// Positions on the previous element found in "MyMemoryZone"
// and returns the value of this element
ResPrevious = MemPrevious("MyMemoryZone")
Syntax
<Result> = MemPrevious(<Name of Memory Zone>)
<Result>: Any type
  • If the previous element exists: return value of the previous element, defined by MemAdd or MemModify.
  • If the previous element does not exist: an empty string ("").
<Name of Memory Zone>: Character string (with quotes)
Name of memory zone, defined by MemCreate.
Remarks

Sorting the memory zone

The sorts performed by MemSort are taken into account during the call to MemPrevious.
If no sort was requested by MemSort, MemPrevious returns the value of the previous element according to the order of the elements added by MemAdd.

Existence of memory zone

The existence of the memory zone is not checked.
If <Name of Memory Zone> does not exist, a WLanguage error occurs when MemPrevious is run.
To check the existence of a memory zone, use MemExist.

Performing a search in a memory zone

If MemSeek is used before the call to MemPrevious, MemPrevious will be positioned on the previous element sought.

Equivalence

The two following syntaxes are equivalent:
Res = MemPrevious(<Name of Memory Zone>)

Res = MemRetrieve(<Name of Memory Zone>, MemCurrent(<Name of Memory Zone>)-1)
Components
WINDEVWEBDEV - Server codeReports and Queries wd230std.dll
Java wd230java.jar
Linux wd230std.so
Android wd230android.jar
Minimum required version
  • Version 9
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