cordova-plugin-datecs-printer打印非拉丁字符异常问题求助

Hey there! Let’s fix that garbled non-Latin character issue in your Ionic app. Since you’ve confirmed the printer supports these characters (via other apps), the problem likely lies in how the plugin handles encoding or data transmission. Here are actionable steps to resolve it:

1. Try Printer-Native Encodings Instead of UTF-8 #

Many thermal printers don’t fully support UTF-8, even if they can render non-Latin characters. Swap out 'UTF-8' for an encoding that matches your target characters:

• For Chinese characters (大, 埔, 區): Try 'GB2312' or 'GBK' (common for Chinese thermal printers)
• For Romanian characters (ă, â, ț): Try 'ISO-8859-2' (Latin-2 encoding)

Modified code example:

public printText(){ 
  return new Promise((resolve, reject) => { 
    DatecsPrinter.printText('埔區埔區埔區', 'GB2312', success => { 
      resolve(success); 
    }, function (error) { 
      reject(error); 
    }); 
  }); 
}

2. Print Raw Byte Data Instead of Using printText #

The printText method might be doing internal encoding conversions that break non-Latin characters. Instead, convert your string to a byte array matching the printer’s supported encoding, then use printRawData:

Step 1: Convert string to Uint8Array #

• For Romanian characters: Use native TextEncoder with iso-8859-2
• For Chinese characters: Use a library like iconv-js (since native TextEncoder doesn’t support GBK/GB2312)

// For Romanian characters using ISO-8859-2
const encoder = new TextEncoder('iso-8859-2');
const byteArray = encoder.encode('ăâțăâț');

// For Chinese characters using GBK (requires iconv-js)
// import iconv from 'iconv-js';
// const byteArray = iconv.encode('埔區埔區埔區', 'GBK');

Step 2: Print the raw data #

public printRawText(){ 
  return new Promise((resolve, reject) => { 
    DatecsPrinter.printRawData(byteArray, success => { 
      resolve(success); 
    }, function (error) { 
      reject(error); 
    }); 
  }); 
}

3. Load the Correct Font to the Printer #

Some Datecs printers require you to load a font that supports non-Latin characters into their memory before printing. Check the plugin’s documentation for APIs like loadFont or selectFont to specify the right font profile. Example workflow:

// Example (verify exact method names in plugin docs)
DatecsPrinter.loadFont('chinese-support-font.bin', () => {
  // Print after font is loaded
  this.printText();
}, (err) => console.error('Font load error:', err));

4. Update the Plugin to the Latest Version #

Older versions of cordova-plugin-datecs-printer might have encoding bugs. Run these commands to update:

cordova plugin remove cordova-plugin-datecs-printer
cordova plugin add cordova-plugin-datecs-printer@latest

Start with swapping the encoding first—it’s the quickest fix for most cases. If that doesn’t work, try printing raw data or updating the plugin.

内容的提问来源于stack exchange，提问作者Alexandru Pufan