我需要在热敏打印机(SAM4S ELLIX40)中打印此图像。
我一直在搜索和测试几个代码,但实际上没有任何效果,他们说“使用这个命令,你会看到一行”,我发送了它,但没有任何反应。
我尝试了手册中的命令:
- ESC * m nL nH d1…dk
- GS * x y d1…dk
我最常尝试的是ESC *,但我一直不明白如何设置nL和nH。
String text_to_print = "Hello world!";
DocPrintJob dpj = selected_printjob.createPrintJob();
InputStream stream = new ByteArrayInputStream((text_to_pring).getBytes());
DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
Doc doc = new SimpleDoc(stream, flavor, null);
dpj.print(doc, null);
Pedro 的问题(我不知道如何引用它):“有了这个库,我必须改变将数据发送到项目中打印机的方式,对吧?”
回答你的最后一条评论,我认为混合来自不同库的调用是完全不合适的,但是,偶尔,这种情况可能会发生......让我们走吧,在发送图像之前,我们需要对齐 hello world // I 的示例认为要向热敏打印机(ESC / POS)发送问候语,您可以这样编写代码。有了这个种子,您可以根据需要输入新的 ESC / POS 命令。如果您的遗留代码可以嵌入到此示例中,那么您的问题的答案是肯定的,escpos_coffee 库与 OutputStream 配合使用,并且可以静默嵌入,如以下示例所示。
这段代码使用escpos_咖啡 https://github.com/anastaciocintra/escpos-coffee
package pedrojoaquim;
import escpos.EscPos;
import escpos.image.BitonalThreshold;
import escpos.image.EscPosImage;
import escpos.image.RasterBitImageWrapper;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
public class PedroJoaquim {
public void printImage() throws PrintException, IOException{
String text_to_print = "Hello world!";
PrintService foundService = PrintServiceLookup.lookupDefaultPrintService();
DocPrintJob dpj = foundService.createPrintJob();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
/// your legacy commands ini
// initialize printer
outputStream.write(27); // ESC
outputStream.write('@');
// print text
outputStream.write(text_to_print.getBytes());
// feed 5 lines
outputStream.write(27); // ESC
outputStream.write('d');
outputStream.write(5);
// cut paper
outputStream.write(29); // GS
outputStream.write('V');
outputStream.write(48);
/// your legacy commands end
/// fitting lib calls on same outputStream
EscPos escpos = new EscPos(outputStream);
RasterBitImageWrapper imageWrapper = new RasterBitImageWrapper();
BufferedImage githubBufferedImage = ImageIO.read(new File("/Users/marco/Downloads/smile.jpg"));
EscPosImage escposImage = new EscPosImage(githubBufferedImage, new BitonalThreshold());
// print smile image...
escpos.write(imageWrapper, escposImage);
// lib end
/// legacy continues from this point
// print text
outputStream.write(" Joaquim's Smile image".getBytes());
// feed 5 lines
outputStream.write(27); // ESC
outputStream.write('d');
outputStream.write(5);
// cut
outputStream.write(29); // GS
outputStream.write('V');
outputStream.write(48);
// do not forguet to close outputstream
outputStream.close();
ByteArrayInputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray());
DocFlavor flavor = DocFlavor.INPUT_STREAM.AUTOSENSE;
Doc doc = new SimpleDoc(inputStream, flavor, null);
dpj.print(doc, null);
}
public static void main(String[] args) throws IOException {
PedroJoaquim obj = new PedroJoaquim();
try {
obj.printImage();
} catch (PrintException ex) {
Logger.getLogger(PedroJoaquim.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
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