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  • Sorting the memory area
  • Existence of memory area
  • Equivalence
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Stored procedures
Warning
From version 20, this feature is kept for backward compatibility. We recommend that you use Associative arrays.
Positions on the first element of a memory zone and returns the value of this first element.
Versions 15 and later
Android This function is now available for Android applications.
New in version 15
Android This function is now available for Android applications.
Android This function is now available for Android applications.
Versions 17 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
Versions 18 and later
Android Widget This function is now available in Android widget mode.
New in version 18
Android Widget This function is now available in Android widget 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.
Versions 26 and later
Apple Watch This function is now available for Apple Watch applications.
New in version 26
Apple Watch This function is now available for Apple Watch applications.
Apple Watch This function is now available for Apple Watch applications.
Example
// Positions on the first element found in "MyMemoryZone"
// and returns the value of this element
ResFirst = MemFirst("MyMemoryZone")
sChaîne is string = "A"
sChaîne = Complète(sChaîne, 10000, "B")
Trace(Length(sChaîne))
 
MemCreate("ZM")
MemAdd("ZM", "1", sChaîne)
sChaîne = MemFirst("ZM")
Trace(Length(sChaîne))
Syntax
<Result> = MemFirst(<Memory area>)
<Result>: Any type
  • If the memory area is not empty: return value of the first element, defined by MemAdd or MemModify.
  • If the memory area is empty: an empty string ("").
<Memory area>: Character string
Name of the memory area, defined by MemCreate.
Remarks

Sorting the memory area

The sorts performed by MemSort are taken into account during the call to MemFirst.
If no sort was requested, MemFirst returns the value of the first element added by MemAdd.

Existence of memory area

The existence of the memory zone is not checked.
If the specified memory area does not exist, a WLanguage error occurs when MemFirst is used.
To check the existence of a memory area, use MemExist.

Equivalence

The two following syntaxes are equivalent:
Res = MemFirst(<Memory area>)

Res = MemRetrieve(<Memory area>, 1)
Business / UI classification: Neutral code
Component: wd270std.dll
Minimum version required
  • Version 9
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