Q:

InnoSetup: FileSize

I need to get size of File. I need to check if file more then 100b example:
If FileSize('C:\Program Files\MyProgramm\MyApp.exe') > 100 
   then
     msgbox ('File more then 100', mbinformation,mb_ok)
   else 
     msgbox ('File less then 100', mbinformation,mb_ok)

I look function FileSize(const Name: String; var Size: Integer): Boolean; , but it's work only if I need check -  size correct or not. But I cann't check on more or less

A:

The var keyword in the function prototype means that you need to declare a variable of the given type and pass it to the function. That variable then receives the value. Here is an example with the FileSize function:
var
  Size: Integer;
begin
  // the second parameter of the FileSize function is defined as 'var Size: Integer',
  // so we need to pass there a variable of type Integer, which is the Size variable
  // declared above
  if FileSize('C:\TheFile.any', Size) then
  begin
    if Size > 100 then
      MsgBox('The file is bigger than 100B in size.', mbInformation, MB_OK)
    else
      MsgBox('The file is smaller than 100B in size.', mbInformation, MB_OK);
  end
  else
    MsgBox('Reading the file size failed.', mbError, MB_OK);
end;

