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【视频教程】App Inventor 2 基础组件使用 - App Inventor 2 中文网 - 清泛...

【视频教程】App Inventor 2 基础组件使用app_inventor_2_basic_component_usage<iframe allowfullscreen= \"true \" border= \"0 \" frameborder= \"no \" framespacing= \"0 \" scrolling= \"no \" src= \" player bilibili com player html?aid=652531626&bvid=BV1HY4y127rN&cid=1025709578&page=1&high_qu...
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浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术

浮点数在内存中的表示Float_Memory_Representation一般我们常见的字符型、整型在内存中采用标准的二进制存储,但是程序员往往容易忽略浮点数在内存中的储存方式,从而会导致一些误用,最常见的是浮点数等于零的判断。只有理解...
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ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注C++内核技术

ATL CComPtr和CComQIPtr详解ATL-CComPtr-CComQIPtrCComPtr和CComQIPtr的不同的地方:CComPtr只能创建固定的特定的接口指针实例。而CComQIPtr不但实现了CComPtr的所有的功能,而且当我们把一个不同类型的接口指针赋值给CComQIPtr的时候,CComQIPtr会自...
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MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe) ...

MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe)MFC-Telnet-Applicationmfc程序telnet ip:端口,代码原生实现、不调用telnet.exe。程序源码工程升级后,可能出现编译不过的情况,请将stdafx.h中0x0410全部改为0x0501即可。The artic...
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char类型移动跨平台踩过的坑 - C/C++ - 清泛网 - 专注C++内核技术

char类型移动跨平台踩过的坑CFLAG-fsigned-charchar强转int时,发现在x86平台下是按照有符号处理的,但是在ARM32下被当成了无符号导致问题,ARM64正常有符号。经调查,在PC上,char类型默认为signed-char,但是在一些嵌入式设备 char强转...
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Reference to \' \' is ambiguous:符号定义重复 - C/C++ - 清泛网 - 专注C++内核技术

Reference to ' ' is ambiguous:符号定义重复Reference-to-is-ambiguousReference to & 39; & 39; is ambiguous 编译错误:从字面上看就是引用某个符号(变量、类名、函数等)的定义不明确,重复。以下为可能的原因及解决方法:1、自定义的变量名 ...
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[解决]Missing Constraint: Bundle-RequiredExecutionEnvironment: J2SE-1....

[解决]Missing Constraint: Bundle-RequiredExecutionEnvironment: J2SE-1.5eclipse-Missing-Constraint原因:eclipse版本太老了,java版本太新了不匹配导致。解决:安装最新的eclipse,地址:https: www eclipse org downloads 参考:https: www eclipse org forums index php t 1...
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【解决】Missing FindPython3.cmake - C/C++ - 清泛网 - 专注C++内核技术

【解决】Missing FindPython3.cmakeMissing-FindPython3-cmake编译llvm时,报错:CMake Error at CMakeLists txt:729 (find_package): By not providing "FindPython3 cmake" in CMAKE_MODULE_PATH this project has asked 编译llvm时,报错: CMake Error at CMakeLists.txt:729 (find_package):...
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【解决】This is allowed only when policy CMP0079 is set to NEW. - C/C+...

【解决】This is allowed only when policy CMP0079 is set to NEW.This-is-allowed-only-when-policy-CMP0079-is-set-to-NEWcmake最低版本设置为3 13以上,可解决。cmake_minimum_required(VERSION 3 13) can fix the first problem 参考:https: gitlab kitware com cmake cmake - issues 19693cma...
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An operation on a socket could not be performed because the system lac...

An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足,或者因为队列已满,不能执行套接字上的操作)An-operation-on-a-socket-could-not-be-performed-because-the-system-lacked-sufficient-buffer-space服务...