在热蓝牙打印机编程方式更改字体大小

Question

我有一个58毫米“MINI热敏打印机”，型号：ZJ-5805DD与我的POS应用POS打印机使用。

我已经成功地编程通过蓝牙连接我的应用程序的打印机，可以使用打印文本罚款

KitchenPrinter.writeValue(myStringData, for: A2orC2, type: .withoutResponse)

*注：A2或C2 [见-下文]特性产生相同的文本打印出来。

---

更改字体打印尺寸已经成为我一个死胡同。我知道这是可能的，因为打印机曼努埃尔让我下载打印测试“POS-打印机V1.0”从App Store可以改变字体大小

在服务/特征的发现，我们发现4个服务A，B，C，d（为简化讨论）

A：

CBService：0x1c0a6a5c0，值isPrimary = YES，UUID = 49535343-FE7D-4AE5-8FA9-9FAFD205E455

CBCharacteristic: 0x1c02adf80, UUID = 49535343-1E4D-4BD9-BA61-23C647249616, properties = 0x10, value = (null), notifying = NO

包含NOTIFY

CBCharacteristic: 0x1c02bba80, UUID = 49535343-8841-43F4-A8D4-ECBE34729BB3, properties = 0xC, value = (null), notifying = NO

包含WRITE WRITEWITHOUTRESPONSE

---

B：

CBService：0x1c0a6ce80，值isPrimary = YES，UUID = E7810A71-73AE-499D-8C15-FAA9AEF0C3F2

  CBCharacteristic: 0x1c02adfe0, UUID = BEF8D6C9-9C21-4C9E-B632-BD58C1009F9F, properties = 0x3E, value = (null), notifying = NO

都包含写WRITEWITHOUTRESPONSE通知读取INDICATE

---

C：

CBService：0x1c0a69100，值isPrimary = YES，UUID = 18F0

  CBCharacteristic: 0x1c02b8000, UUID = 2AF0, properties = 0x30, value = (null), notifying = NO

包含NOTIFY INDICATE

  CBCharacteristic: 0x1c02a5700, UUID = 2AF1, properties = 0xC, value = (null), notifying = NO

包含WRITE WRITEWITHOUTRESPONSE

---

d：

CBService：0x1c0a68300，​​值isPrimary = YES，UUID =设备信息

  CBCharacteristic: 0x1c02a5dc0, UUID = Serial Number String, properties = 0x2, value = (null), notifying = NO

包含READ

  CBCharacteristic: 0x1c02a77a0, UUID = Software Revision String, properties = 0x2, value = (null), notifying = NO

包含READ

  CBCharacteristic: 0x1c02a76e0, UUID = Hardware Revision String, properties = 0x2, value = (null), notifying = NO

包含READ

  CBCharacteristic: 0x1c02a6060, UUID = Manufacturer Name String, properties = 0x2, value = (null), notifying = NO

包含READ

---

我一直在网上淘了天为迅速解决。可以请别人帮忙吗？

Answer 1

解决的问题：寻找ESC/POS commands和this StackOverflow post后，我能够改变使用以下函数，它接受hexcodes的阵列称为M58-LL或ZJ-5805打印机上的打印尺寸，将它们转换成UnicodeScalar，然后Character和它们附加到这是发送到打印机相同的文本打印输出String。

let hexs = [0x1b,0x21,0x20] //doubleWide
var hexString = String() 
for all in hexs {
    if let scalar = UnicodeScalar(all) {
        hexString.append(Character(scalar))
    }
}
let theData = hexString.data(using: .utf8)!
myPrinter.writeValue(theData, for: printCharacteristic, type: .withoutResponse)

//printCharacteristic corresponds with Service/Characteristic B

[0x1b,0x21,0x00] //default
[0x1b,0x21,0x01] //small font
[0x1b,0x21,0x08] //bold
[0x1b,0x21,0x10] //doubleHeight
[0x1b,0x21,0x20] //doubleWidth
[0x1b,0x21,0x20] //doubleHeightAndWidth