#Free pascal convert tdatetime to string windows

If you have RPi with memory size less then 4Gb, and you want to use FPCUPdeluxe, you need to adjust the swap file size before installing Lazarus: Installing and compiling Lazarus Correcting swap file size

2.6 PXL (Platform eXtended Library) for low level native access to GPIO, I☬, SPI, PWM, UART, V4L2, displays and sensors.

2.5 PiGpio Low-level native pascal unit (GPIO control instead of wiringPi c library).

2.4 rpi_hal-Hardware Abstraction Library (GPIO, I2C and SPI functions and procedures).

2.2 Hardware access via encapsulated shell calls.

2.1.1 Switching a device via the GPIO port.

1.4 Cross compiling for the Raspberry Pi from Linux.

#Free pascal convert tdatetime to string windows

1.3 Cross compiling for the Raspberry Pi from Windows.

Character and string types, a detailed reference covering internal memory layout and access options.

The term character is a bit fuzzy when it comes to Unicode. Note: I write 'character' where I mean the the visual glyph on the screen we normally interpret as being a character (and this probably only holds for Western language, not for e.g. But in the long run, you better go with the flow. You can fight the Lazarus system and declare your stings as being of a certain codepage and use RawByteString to prevent the compiler form doing unwanted codepage conversion. So 'i with accent', which consist of 2 bytes is treated as 2 separate chars, and how they look on the console is dependant on your codepage. It can only display 255 different characters, and it treats strings as being single byte encoded. When you write to the console, you have to understand that the console has a different codepage altogether.

UTF8Length(): it returns the length in 'UTF-8 characters', instead of the length in bytes (as Length() does): Utf8Length('Ä') is 1, whilst Length('Ä') is 2.ĭisplaying UTF-8 encoded strings will be displayed as expected in any visual component of Lazarus. The LazUTF8 unit from Lazarus has various functions to handle UTF8 encoded strings.Į.g. This makes iteration through a UTF-8 encoded string more complex than old style single byte encoding (ALIAS codepages). In UTF-8 all plain ASCII (so up to #127) are stored as a single byte.Īll other 'characters' are stored as 2, 3 or 4 byte sequences. So, the string contains more bytes than 'characters', since the 'lowercase i with accent' is made up of 2 bytes. The type String in Lazarus is by default also UTF-8.

The Lazarus IDE stores everything in UTF-8 encoding. In a COM context they are governed by the COM marshaling subsystem if available. Note that BWSTR types rely on COM marshaling or - when used alone - copy semantics instead of reference counting. UnicodeString is similar to WideString but UnicodeString is a managed type and has a reference count whereas widestring is a BWSTR compatible stringtype that is COM compatible and is not reference counted.It is a BWSTR compatible string type and has no reference count. WideString has a variable length like AnsiString but contains WideChar instead of Char.RawByteString is an alias for AnsiString.AnsiString has a variable length that is limited only by the value of High(SizeInt) (which is platfom dependant) and available memory.If a ShortString length is not explicitly given, then the length is implicitly set to 255. name : String ) but is limited to 255 characters. ShortString has a fixed maximum length that is decided by the programmer (e.g.The different string types - ShortString, AnsiString, WideString and UnicodeString - differ with respect to length and content:

Note that all types of longstring are managed types, whereas ShortStrings are not managed types: they have no reference count. If compiler directive // String is an alias for AnsiString var name : String // name is a ShortString variable since a length specification overrides the alias setting String is an alias for ShortString, AnsiString or Unicodestring (UTF16) depending on a compiler setting. Var s, str1, str2, str3, str4 : string c : char n : integer str1 := 'abc' // assignment str2 := '123' // string containing chars 1, 2 and 3 str3 := #10#13 // cr lf str4 := 'this is a '' quoted '' string' // use of quotes within a string s := str1 + str2 // concatenation c := s // use as index in array n := Length ( s ) // length of string s Alias