获取序列号前判断设备是否在线
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@ -3640,6 +3640,9 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
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}
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else if(code == IO_CTRL_CODE_GET_SERIAL)
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{
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if (!is_online())
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return SCANNER_ERR_DEVICE_NOT_FOUND;
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std::string ser = get_serial_num();
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if (*len < ser.size() + 1)
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{
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