PureBasic Forums - English

mk-soft wrote:Programmed on the fast one to quickly create very large strings.
Can also be reprogrammed to UTF8, for example to save the data directly as UTF8.

User_Russian wrote:I asked for the same thing about 6 years ago. viewtopic.php?f=3&t=58892
But it is foolish to expect that it will be done sometime. Because requests are rarely fulfilled!
The requests section needs to be closed, because it's useless. viewtopic.php?f=3&t=75576

kenmo wrote:However, it would be a major change to the string library, and could break 20 years of existing code (memory bugs)

mk-soft wrote:The current string management works and is sufficient for 99.99% of applications.

STARGÅTE wrote:I think some confuse a string with a memory buffer.

Rinzwind wrote:Also storing the length with the string makes it possible to use them for any binary storage (since null doesnt have to have special meaning anymore if you choose so). Can be quite convenient.

helpy wrote:-1

If internally storing string length with each PB string a new problem would arise
This problem would occour if you manipulate a PB string using pointers, memory functions and writing directly to the string memory using Poke or other *PointerToCharcter. Manipulating a string this way would not update the internal string length and PB functions would not work correctly ...

Define text$ = "Hello"
PokeS(@text$, "Hello world!") ; Overflow in a string memory block

NicTheQuick wrote:Isn't there a thing like MemorySize() for a strings buffer? How does this usually work together with AllocateMemory()?
If the operating system already knows how big the memory buffer to a given pointer is, this could be another idea.

mk-soft wrote:The string management of Purebasic is old and needs to be updated.

Here a sad result for comparison ...
Link: viewtopic.php?f=13&t=75750#p557919

So a big plus to the features request after all.

Sicro wrote: I edited my first post for a hint in the fixed string structure. With fixed strings we don't need to store the string length, because the memory buffer surely corresponds exactly to the size needed to store the string and the string length can therefore be easily calculated:

Code: Select all

stringLength = MemorySize(*fixedString) / SizeOf(Character)

s.s{128}

s="1234"
Debug Len(s)

kenmo wrote: Sat Jul 18, 2020 7:40 pmHowever it would be a major change to the string library, and could break 20 years of existing code (memory bugs)

kenmo wrote: Tue Oct 18, 2022 4:12 am- sometimes in PB, people allocate a string variable, and then poke a different string over it (or an API call writes over it)

result$ = Space(255)
WinAPI_Function(@result$)
result$ = PeekS(@result$)
Debug result$

result$ = Space(255)
WinAPI_Function(@result$)
; -1 = search for the null character
UpdateStringLength(result$, -1)
Debug result$

result$ = Space(255)
length = WinAPI_Function(@result$)
UpdateStringLength(result$, length)
Debug result$

kenmo wrote: Tue Oct 18, 2022 4:12 am- sometimes people poke a NUL char to truncate a string shorter

• The new string variable type is implemented as an addition to the existing string variable type. All PB string functions must then support two different string variable types.

  Code: Select all

  newString.z = "Hello"
  oldString.s = newString
  alterString + " World"
  newString = oldString
  Debug newString ; Outputs 'Hello World'
  Debug oldString ; Outputs 'Hello World'

  Code: Select all

  oldString.s{5} = "Hello World"
  newString.z{5} = "Hello World"
  Debug oldString ; Outputs 'Hello'
  Debug newString ; Outputs 'Hello'
  

  The new '.z' declares the new string variable type.

• Each string function gets an optional parameter that can be used to pass the already known string length to the function, so that the function does not have to calculate the string length again.

  Code: Select all

  oldString.s = "Hello World"
  length = Len(oldString)
  Debug Left(oldString, 5, length) ; Outputs 'Hello'
  Debug Right(oldString, 5, length) ; Outputs 'World'
  

Sicro wrote: Sun Nov 13, 2022 5:53 pm After this feature is implemented, the PB string functions Left(), Right() etc. no longer search for a null character

wilbert wrote: Mon Jul 20, 2020 6:11 am And some functions like Split and Join would be a welcome addition.