EscPosBuilder class

ESC/POS command builder. Constructs a sequence of bytes representing commands to a thermal printer. Supports basic formatting, alignment, bold text, barcode, QR code, raster image and cut.

Constructors

EscPosBuilder()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

barcode(String data) → void

Adds a barcode using Code128 (type 73). The printer must support Code128. Data is encoded in Code Set B.

build() → List<int>

Returns the complete list of bytes representing the built receipt.

cut() → void

Cuts the paper. Uses full cut by default.

feed(int lines) → void

Feeds the paper by lines lines.

init() → void

Initializes printer (ESC @) to reset modes. Safe to call multiple times.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

qrCode(String data) → void

Adds a QR code. The data is encoded using the ESC/POS QR code commands (model 2, error correction M, module size 4). This generates a square QR code. See Epson ESC/POS manual for details.

raster(List<int> bitmap) → void

Adds a raster image to the buffer. The bitmap should contain pre‑encoded ESC/POS raster data. Generating image data is outside the scope of this builder; consider using a separate utility to convert an image to mono raster bytes.

setAlign(PosAlign align) → void

Sets the alignment for subsequent text. Sent immediately when called.

text(String text, {PosAlign align = PosAlign.left, bool bold = false}) → void

Adds plain text to the buffer with optional bold and align. The default alignment is PosAlign.left.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited