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  • Left function and UNICODE
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Stored procedures
Extracts the left part (which means the first characters) from a character string or from a buffer.
WEBDEV - Browser code In this version, the left part of a buffer cannot be extracted.
Example
Left("The cuckoo", 6)   // Returns "The cu"
Left("ABC", 50)        // Returns "ABC"
Left("AZELMA ")        // Returns "AZELMA"

MyString is string = "Developing is child's play"
Left(MyString, 10)   // Returns "Developing"
WEBDEV - Server codePHPAjax
// Extract the bytes
MyBuffer is Buffer = "Developing is child's play"
Left(MyBuffer, 10)   // Returns "Developing"
Syntax

Extracting the left part of a character string Hide the details

<Result> = Left(<Source string> [, <Length>])
<Result>: Character string
  • Left part of <Source String>. Corresponds to <Source String> if <Length> is greater than the length of <Source String>.
  • EOT if <Length> is negative. A WLanguage error occurs (non-fatal error). To find out the error details, use ErrorInfo.
<Source string>: Character string (with quotes)
Character string whose left part will be extracted. This string is not modified.
<Length>: Optional integer
Number of characters to extract. If this parameter is not specified, <Result> corresponds to <Source String> without the space characters on the right.
WEBDEV - Server codePHPAjax

Extracting the left part of a buffer Hide the details

<Result> = Left(<Source buffer> [, <Size>])
<Result>: Character string
  • Left part of <Source Buffer>. Corresponds to <Source Buffer> if <Size> is greater than the size of <Source Buffer>.
  • EOT if <Size> is negative. A WLanguage error occurs (non-fatal error). To find out the error details, use ErrorInfo.
  • Invalid buffer if <Source Buffer> contains a character string in UNICODE format.
<Source buffer>: Buffer
Buffer whose left part will be extracted. This buffer is not modified.
<Size>: Optional integer
Number of bytes to extract. If this parameter is not specified, <Result> corresponds to <Source Buffer> without the space characters on the right.
Remarks

Left function and UNICODE

If the string passed in parameter is in ANSI format, the result will be in ANSI format.
If the string passed in parameter is in UNICODE format, the result will be in UNICODE format.
Reminder: In UNICODE, each character occupies two memory bytes. Therefore, the memory footprint of a UNICODE string is twice the number of characters actually found in the string.
The subscript of the first character in the string is set to 1.
Note: If the result on an ANSI string is assigned to a UNICODE string (and conversely), the conversion will be implicitly performed.
See Managing the UNICODE for more details.
Component : wd240vm.dll
Minimum version required
  • Version 9
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