目录正文Core Bluetooth框架蓝牙相关概念使用Core Blueto开发者_JS学习oth框架实现蓝牙功能扫描蓝牙设备连接蓝牙设备发现服务和特征读写数据总结正文
I have two printers installed, but I want my application to print from the billing printer not from the Deskjet.开发者_运维问答 How can I programmatically achieve that? Setting a default printer is no
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