java通过jnative发送命令给标签打印机打印二维码，打印出来的是空白！！

Question

java通过jnative的sendcommand方法发送打印二维码的命令给打印机，但是打印机打印出的是空白，其他的命令都是可以打印的，只有二维码打印出来的是空白（打印机支持二维码打印，通过赠送的软件是可以打印的）。命令是官方给的，就是不知道为什么打印不了！

enter code here

public class BarcodeTest {

public static void main(String[] args) {
    System.out.println(System.getProperty("java.library.path"));
    try {
        BarcodeTest.barcode_print("xxxxxx");
    } catch (NativeException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }

}

public static void barcode_print(String barcode_str)throws NativeException, IllegalAccessException {
    System.load("C:/WINDOWS/system32/TSCLib.dll");
    JNative openport = new JNative("TSCLib.dll","openport");
    openport.setParameter(0,"Gprinter  GP-3120TL");
    openport.invoke();

    JNative size = new JNative("TSCLib","sendcommand");
    size.setParameter(0, "SIZE 40mm,30mm");
    size.invoke();

    JNative gap = new JNative("TSCLib","sendcommand");
    gap.setParameter(0, "GAP 0mm,0mm");
    gap.invoke();

    JNative cls = new JNative("TSCLib","sendcommand");
    cls.setParameter(0, "CLS");
    cls.invoke();       

    JNative sendcommand = new JNative("TSCLib.dll","sendcommand");
      sendcommand.setParameter(0,BarcodeTest.CMD_QRCODE_FROMT_GP3150TN(barcode_str));

sendcommand.invoke();
JNative print = new JNative("TSCLib.dll","sendcommand");
print.setParameter(0, Type.STRING,"PRINT 1,1");
print.invoke();

     //清除 
     JNative clearbuffer = new JNative("TSCLib","clearbuffer");
     clearbuffer.invoke();
     //关闭  
     JNative closeport = new JNative("TSCLib","closeport");
     closeport.invoke();
}

public static String CMD_QRCODE_FROMT_GP3150TN(String barCode){
     StringBuffer sb = new StringBuffer("QRCODE");
     sb.append(" ");
     sb.append("45,");
     sb.append("55,");
     sb.append("L,");
     sb.append("5,");
     sb.append("A,");
     sb.append("0,");
     sb.append("1,");
     sb.append("7,");
     sb.append("\"");
     sb.append(barCode);
     sb.append("\"");
     return sb.toString();
 }

}

Answer 1

试一下
public static String CMD_QRCODE_FROMT_GP3150TN(String barCode){
StringBuffer sb = new StringBuffer("QRCODE");
sb.append(" ");
sb.append("45,");
sb.append("55,");
sb.append("L,");
sb.append("5,");
sb.append("A,");
sb.append("0,");
sb.append("M1,");
sb.append("S7,");
sb.append("\"");
sb.append(barCode);
sb.append("\"");
return sb.toString();
}