大约有 8,000 项符合查询结果(耗时:0.0187秒) [XML]

https://www.fun123.cn/referenc... 

连接打印机 · App Inventor 2 中文网

...件将数据分享给网络打印机App,这种实现思路。 蓝牙及串口打印机,需要研究打印机数据协议(不同品牌协议有差别),暂时不在本文讨论范围。 信息分享器组件介绍 三种分享方式效果,以邮件App测试为...
https://www.fun123.cn/referenc... 

连接打印机 · App Inventor 2 中文网

...件将数据分享给网络打印机App,这种实现思路。 蓝牙及串口打印机,需要研究打印机数据协议(不同品牌协议有差别),暂时不在本文讨论范围。 信息分享器组件介绍 三种分享方式效果,以邮件App测试为...
https://bbs.tsingfun.com/thread-1729-1-1.html 

Run time error "Stack size 8188kb" 报错原理及解决方法 - App ...

App Inventor 2 编写蓝牙App,处理接收到数据时,发生运行时错误:Run time error "Stack size 8188kb",如下: 请问是什么原因?修改参数可不可以解决? ------ 这个8M 是计算机/手机 程序栈大小,8M还算大,没有必...
https://stackoverflow.com/ques... 

UIDevice uniqueIdentifier deprecated - What to do now?

... A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time. But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-ins...
https://stackoverflow.com/ques... 

UUID max character length

We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length. Does anyone know a suitable max char leng...
https://stackoverflow.com/ques... 

Generate a random alphanumeric string in Cocoa

...yourself to hex characters only, then the simplest option is to generate a UUID: NSString *uuid = [NSUUID UUID].UUIDString; Example output: 16E3DF0B-87B3-4162-A1A1-E03DB2F59654. If you want a smaller random string then you can grab just the first 8 characters. It's a version 4 UUID which means ...
https://www.tsingfun.com/it/cpp/2110.html 

C++ stl stack/queue 使用方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

...素类型,一个容器类型,但只有元素类型是必要,在不指定容器类型时,默认容器类型为deque。 定义stack 对象示例代码如下: stack<int> s1; stack<string> s2; stack 基本操作有: 入栈,如例:s.push(x); 出栈,如例:s.pop(); ...
https://www.tsingfun.com/it/tech/2260.html 

plsql 存储过程 事务 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...点,释放锁,丢弃所有未决数据改变。 7、回滚事务到指定保存点(ROLLBACK TO SAVEPOINT)回滚当前事务到指定保存点,丢弃该保存点创建后任何改变,释放锁。 8、当执行DDL、DCL语句,或退出SQL*PLUS时,会自动提交事务; ...
https://stackoverflow.com/ques... 

Likelihood of collision using most significant bits of a UUID in Java

If I'm using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right? ...
https://www.tsingfun.com/it/cpp/2161.html 

socket网络编程中read与recv区别 - C/C++ - 清泛网 - 专注C/C++及内核技术

...read与recv区别1、read 与 recv 区别read 原则:数据在不超过指定长度时候有多少读多少,没有数据则会一直等待。所以一般情况下:我们读取数据都...1、read 与 recv 区别 read 原则: 数据在不超过指定长度时候有多少读多...