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<h1 id="receipt-printer-driver-functions">Receipt Printer driver functions</h1>
<p>PostalPoint abstracts the receipt printer hardware commands, so the same functions are available on
all brands and languages of receipt printer, and printer media size and settings are also handled for you.</p>
<p>The drivers operate in line mode, where each successive command appends content to the bottom of the page.</p>
<p>These functions are available on the object supplied by the promise returned from
<code>global.apis.print.getReceiptPrinter()</code>.</p>
<h2 id="functions">Functions</h2>
<div class="language-javascript highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">//</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1">// Add one or more lines of text, with automatic wrapping.</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="c1">// If both firsttext and secondtext are provided, two columns of text are generated,</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="c1">// with the first left-justified and the second right-justified.</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="c1">// `firstjustify` can be &quot;L&quot; (left), &quot;C&quot; (center), or &quot;R&quot; (right).</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="c1">// Not all printers support all the formatting options, and may render them in different ways,</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="c1">// but the formatting intent is made clear regardless.</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="nx">addFieldBlock</span><span class="p">(</span><span class="nx">firsttext</span><span class="p">,</span><span class="w"> </span><span class="nx">firstjustify</span><span class="p">,</span><span class="w"> </span><span class="nx">secondtext</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;&quot;</span><span class="p">,</span><span class="w"> </span><span class="nx">secondjustify</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;R&quot;</span><span class="p">,</span><span class="w"> </span><span class="nx">bold</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="nx">doubleheight</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">false</span><span class="p">,</span><span class="w"> </span><span class="nx">underline</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">false</span><span class="p">);</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="c1">// Add a blank line to the label.</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="nx">newLine</span><span class="p">();</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="c1">// Draw a horizontal line across the page.</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="nx">drawLine</span><span class="p">();</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="c1">// Render a Code 128 barcode, centered horizontally, with a human-readable label beneath.</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="c1">// Important: this function is sometimes asynchronous depending on the printer driver.</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="nx">barcode128</span><span class="p">(</span><span class="nx">content</span><span class="p">);</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="c1">// Print an image. Width is in pixels.</span>
</span><span id="__span-0-21"><a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="c1">// pixelByteArray is a Uint8Array where each bit is a pixel (1=black, 0=white),</span>
</span><span id="__span-0-22"><a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="c1">// starting at the top-left of the image and going across and then down. Use `imageToBitmap` to</span>
</span><span id="__span-0-23"><a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="c1">// obtain this data from a Jimp image.</span>
</span><span id="__span-0-24"><a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="c1">// Use &quot;L&quot; as the position to print on the next line, centered horizontally.</span>
</span><span id="__span-0-25"><a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="c1">// Some printers also support position = &quot;C&quot;, which will</span>
</span><span id="__span-0-26"><a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="c1">// ignore other commands and print the image centered on the label,</span>
</span><span id="__span-0-27"><a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="c1">// but if you&#39;re doing that, just use `global.apis.print.printLabelImage()` instead.</span>
</span><span id="__span-0-28"><a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="nx">drawImage</span><span class="p">(</span><span class="nx">width</span><span class="p">,</span><span class="w"> </span><span class="nx">position</span><span class="p">,</span><span class="w"> </span><span class="nx">pixelByteArray</span><span class="p">);</span>
</span><span id="__span-0-29"><a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a>
</span><span id="__span-0-30"><a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a><span class="c1">// If supported by the printer, opens an attached cash drawer. Command is ignored if unavailable.</span>
</span><span id="__span-0-31"><a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="nx">openCashDrawer</span><span class="p">();</span>
</span><span id="__span-0-32"><a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a>
</span><span id="__span-0-33"><a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="c1">// The last command to run, when ready to print. Returns the raw data to send to the printer.</span>
</span><span id="__span-0-34"><a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="c1">// Important: this function is sometimes asynchronous depending on the printer driver.</span>
</span><span id="__span-0-35"><a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="nx">getData</span><span class="p">();</span>
</span></code></pre></div>
<h2 id="example">Example</h2>
<div class="language-javascript highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">var</span><span class="w"> </span><span class="nx">printer</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">await</span><span class="w"> </span><span class="nb">global</span><span class="p">.</span><span class="nx">apis</span><span class="p">.</span><span class="nx">print</span><span class="p">.</span><span class="nx">getReceiptPrinter</span><span class="p">();</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nx">printer</span><span class="p">.</span><span class="nx">addFieldBlock</span><span class="p">(</span><span class="s2">&quot;Hello Bold World!&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;C&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;&quot;</span><span class="p">,</span><span class="w"> </span><span class="s2">&quot;&quot;</span><span class="p">,</span><span class="w"> </span><span class="kc">true</span><span class="p">);</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="nx">printer</span><span class="p">.</span><span class="nx">drawLine</span><span class="p">();</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="k">await</span><span class="w"> </span><span class="nx">printer</span><span class="p">.</span><span class="nx">barcode128</span><span class="p">(</span><span class="s2">&quot;1234567890&quot;</span><span class="p">);</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="nx">printer</span><span class="p">.</span><span class="nx">newLine</span><span class="p">();</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="k">await</span><span class="w"> </span><span class="nb">global</span><span class="p">.</span><span class="nx">apis</span><span class="p">.</span><span class="nx">printer</span><span class="p">.</span><span class="nx">printReceiptData</span><span class="p">(</span><span class="k">await</span><span class="w"> </span><span class="nx">printer</span><span class="p">.</span><span class="nx">getData</span><span class="p">());</span>
</span></code></pre></div>
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