Ergebnis der Suchanfrage

• Forum: Programmieren allgemein

  AW: Delphi 12 und SendMessage

   
    by Kas Ob., 20. Feb 2024
  Well, you are right if the target is the variable itself not what it does represent, like in case data serialization against passing data between threads in the same process using thread safe list.
  But for more accurate example :
  We all familiar with Windows API's that takes structures (records), and many of them do need special initialization with cbSize or the very popular...
• Forum: Programmieren allgemein

  AW: Delphi 12 und SendMessage

   
    by Kas Ob., 20. Feb 2024
  You are right, but for best practice i prefer never to use variable, to avoid situations like the following
  type
  PMyRecord = ^TMyRecord;
  
  TMyRecord = record
  Buffer: array of Byte;
  end;
  
  TMyClass = class
  public
• Forum: Programmieren allgemein

  AW: Delphi 12 und SendMessage

   
    by Kas Ob., 19. Feb 2024
  That can't be right.
  
  First i put SizeOf(TCopyDataStruct) not sizeof(aCopyData), why it is important because 8 and 4 are the size of single and simple pointer, not a record (struct), and 8 and 4 looks like a pointer something like PCopyDataStruct not TCopyDataStruct, or you just used @aCopyData by mistake.
  Second as rule of thumb, never ever use with SendMessage, PostMessage... parameters...
• Forum: Programmieren allgemein

  AW: Delphi 12 und SendMessage

   
    by Kas Ob., 19. Feb 2024
  Hi,
  
  Just an idea, i don't have Delphi 12, but form what i read there is change in default Integer and NativeInt...
  
  So please check the size of TCopyDataStruct in both Delphi 11 and 12, may be something broke there with dwData,
  It would be nice if you shared with us the SizeOf(TCopyDataStruct) in the 4 cases Delphi 11 and Delphi 12 for application with 32bit and 64bit.