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  • Sorting the memory zone
  • Existence of memory zone
  • Equivalence
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Stored procedures
Warning
From version 20, this feature is kept for backward compatibility. We recommend that you use the 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 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
WINDEVWINDEV Mobile 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
WINDEVWINDEV Mobile This function is now available in Windows Store apps mode.
Android Widget This function is now available in Android Widget mode.
WINDEVWINDEV Mobile 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 first element found in "MyMemoryZone"
// and returns the value of this element
ResFirst = MemFirst("MyMemoryZone")
sString is string = "A"
sString = Complete(sString, 10000, "B")
Trace(Length(sString))

MemCreate("MZ")
MemAdd("MZ", "1", sString)
sString = MemFirst("MZ")
Trace(Length(sString))
Syntax
<Result> = MemFirst(<Name of Memory Zone>)
<Result>: Any type
  • If the memory zone is not empty: return value of the first element, defined by MemAdd or MemModify.
  • If the memory zone is empty: an empty string ("").
<Name of Memory Zone>: Character string (with quotes)
Name of the memory zone, defined by MemCreate.
Remarks

Sorting the memory zone

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 zone

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

Equivalence

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

Res = MemRetrieve(<Name of Memory Zone>, 1)
Component : wd250std.dll
See also
Minimum version required
  • Version 9
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