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2024年12月11日,来源:中国青年报客户端

...的另类文学代表作品:《曼娜回忆录》和《少女的心》陈曼娜个人资料/图片/视频全集-陈曼娜的电影电视剧作品-搜...

2020年董明珠大举进军直播当年她亲自上前线直播带货共13场累计带货金额476亿元2021年持续推进格力电器渠道转型的董明珠在综艺节目上活跃了起来也正是在节目中孟羽童作为格力电器市场部实习生得到了董明珠的赏识

C++基础语法梳理:Windows 的动态链接库2021-11-01 17:46·C语言编程Windows 应用程序入口函数GUI(Graphical User Interface)应用,链接器选项:/SUBSYSTEM:WINDOWSCUI(Console User Interface)应用,链接器选项:/SUBSYSTEM:CONSOLE_tWinMain 与 _tmain 函数声明Int WINAPI _tWinMain( HINSTANCE hInstanceExe, HINSTANCE, PTSTR pszCmdLine, int nCmdShow);int _tmain( int argc, TCHAR *argv[], TCHAR *envp[]);Windows 的动态链接库(Dynamic-Link Library)部分知识点来自《Windows 核心编程(第五版)》用处(1)扩展了应用程序的特性(2)简化了项目管理(3)有助于节省内存(4)促进了资源的共享(5)促进了本地化(6)有助于解决平台间的差异(7)可以用于特殊目的注意(1)创建 DLL,事实上是在创建可供一个可执行模块调用的函数(2)当一个模块提供一个内存分配函数(malloc、new)的时候,它必须同时提供另一个内存释放函数(free、delete)(3)在使用 C 和 C++ 混编的时候,要使用 extern "C" 修饰符(4)一个 DLL 可以导出函数、变量(避免导出)、C++ 类(导出导入需要同编译器,否则避免导出)(5)DLL 模块:cpp 文件中的 __declspec(dllexport) 写在 include 头文件之前(6)调用 DLL 的可执行模块:cpp 文件的 __declspec(dllimport) 之前不应该定义 MYLIBAPI加载 Windows 程序的搜索顺序1、包含可执行文件的目录2、Windows 的系统目录,可以通过 GetSystemDirectory 得到3、16 位的系统目录,即 Windows 目录中的 System 子目录4、Windows 目录,可以通过 GetWindowsDirectory 得到5、进程的当前目录6、PATH 环境变量中所列出的目录DLL 入口函数DllMain 函数BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved){ switch(fdwReason) { case DLL_PROCESS_ATTACH: // 第一次将一个DLL映射到进程地址空间时调用 // The DLL is being mapped into the process' address space. break; case DLL_THREAD_ATTACH: // 当进程创建一个线程的时候,用于告诉DLL执行与线程相关的初始化(非主线程执行) // A thread is bing created. break; case DLL_THREAD_DETACH: // 系统调用 ExitThread 线程退出前,即将终止的线程通过告诉DLL执行与线程相关的清理 // A thread is exiting cleanly. break; case DLL_PROCESS_DETACH: // 将一个DLL从进程的地址空间时调用 // The DLL is being unmapped from the process' address space. break; } return (TRUE); // Used only for DLL_PROCESS_ATTACH}载入卸载库LoadLibrary、LoadLibraryExA、LoadPackagedLibrary、FreeLibrary、FreeLibraryAndExitThread 函数声明// 载入库HMODULE WINAPI LoadLibrary( _In_ LPCTSTR lpFileName);HMODULE LoadLibraryExA( LPCSTR lpLibFileName, HANDLE hFile, DWORD dwFlags);// 若要在通用 Windows 平台(UWP)应用中加载 Win32 DLL,需要调用 LoadPackagedLibrary,而不是 LoadLibrary 或 LoadLibraryExHMODULE LoadPackagedLibrary( LPCWSTR lpwLibFileName, DWORD Reserved);// 卸载库BOOL WINAPI FreeLibrary( _In_ HMODULE hModule);// 卸载库和退出线程VOID WINAPI FreeLibraryAndExitThread( _In_ HMODULE hModule, _In_ DWORD dwExitCode);显示地链接到导出符号GetProcAddress 函数声明FARPROC GetProcAddress( HMODULE hInstDll, PCSTR pszSymbolName // 只能接受 ANSI 字符串,不能是 Unicode);DumpBin.exe 查看 DLL 信息在 VS 的开发人员命令提示符 使用 DumpBin.exe 可查看 DLL 库的导出段(导出的变量、函数、类名的符号)、相对虚拟地址(RVA,relative virtual address)。如:LoadLibrary 与 FreeLibrary 流程图LoadLibrary 与 FreeLibrary 流程图LoadLibraryFreeLibraryDLL 库的编写(导出一个 DLL 模块)DLL 库的编写(导出一个 DLL 模块) DLL 头文件// MyLib.h#ifdef MYLIBAPI// MYLIBAPI 应该在全部 DLL 源文件的 include "Mylib.h" 之前被定义// 全部函数/变量正在被导出#else// 这个头文件被一个exe源代码模块包含,意味着全部函数/变量被导入#define MYLIBAPI extern "C" __declspec(dllimport)#endif// 这里定义任何的数据结构和符号// 定义导出的变量(避免导出变量)MYLIBAPI int g_nResult;// 定义导出函数原型MYLIBAPI int Add(int nLeft, int nRight);DLL 源文件// MyLibFile1.cpp// 包含标准Windows和C运行时头文件#include // DLL源码文件导出的函数和变量#define MYLIBAPI extern "C" __declspec(dllexport)// 包含导出的数据结构、符号、函数、变量#include "MyLib.h"// 将此DLL源代码文件的代码放在此处int g_nResult;int Add(int nLeft, int nRight){ g_nResult = nLeft + nRight; return g_nResult;}DLL 库的使用(运行时动态链接 DLL)DLL 库的使用(运行时动态链接 DLL)// A simple program that uses LoadLibrary and // GetProcAddress to access myPuts from Myputs.dll. #include #include typedef int (__cdecl *MYPROC)(LPWSTR); int main( void ) { HINSTANCE hinstLib; MYPROC ProcAdd; BOOL fFreeResult, fRunTimeLinkSuccess = FALSE; // Get a handle to the DLL module. hinstLib = LoadLibrary(TEXT("MyPuts.dll")); // If the handle is valid, try to get the function address. if (hinstLib != NULL) { ProcAdd = (MYPROC) GetProcAddress(hinstLib, "myPuts"); // If the function address is valid, call the function. if (NULL != ProcAdd) { fRunTimeLinkSuccess = TRUE; (ProcAdd) (L"Message sent to the DLL function\n"); } // Free the DLL module. fFreeResult = FreeLibrary(hinstLib); } // If unable to call the DLL function, use an alternative. if (! fRunTimeLinkSuccess) printf("Message printed from executable\n"); return 0;}运行库(Runtime Library)典型程序运行步骤(1)操作系统创建进程,把控制权交给程序的入口(往往是运行库中的某个入口函数)(2)入口函数对运行库和程序运行环境进行初始化(包括堆、I/O、线程、全局变量构造等等)。(3)入口函数初始化后,调用 main 函数,正式开始执行程序主体部分。(4)main 函数执行完毕后,返回到入口函数进行清理工作(包括全局变量析构、堆销毁、关闭I/O等),然后进行系统调用结束进程。一个程序的 I/O 指代程序与外界的交互,包括文件、管程、网络、命令行、信号等。更广义地讲,I/O 指代操作系统理解为 “文件” 的事物。glibc 入口_start -> __libc_start_main -> exit -> _exit其中 main(argc, argv, __environ) 函数在 __libc_start_main 里执行。MSVC CRT 入口int mainCRTStartup(void)执行如下操作:(1)初始化和 OS 版本有关的全局变量。(2)初始化堆。(3)初始化 I/O。(4)获取命令行参数和环境变量。(5)初始化 C 库的一些数据。(6)调用 main 并记录返回值。(7)检查错误并将 main 的返回值返回。C 语言运行库(CRT)大致包含如下功能:启动与退出:包括入口函数及入口函数所依赖的其他函数等。标准函数:有 C 语言标准规定的C语言标准库所拥有的函数实现。I/O:I/O 功能的封装和实现。堆:堆的封装和实现。语言实现:语言中一些特殊功能的实现。调试:实现调试功能的代码。C语言标准库(ANSI C)包含:标准输入输出(stdio.h)文件操作(stdio.h)字符操作(ctype.h)字符串操作(string.h)数学函数(math.h)资源管理(stdlib.h)格式转换(stdlib.h)时间/日期(time.h)断言(assert.h)各种类型上的常数(limits.h & float.h)变长参数(stdarg.h)非局部跳转(setjmp.h)今天的分享就到这里了,大家要好好学C++哟~写在最后:对于准备学习C/C++编程的小伙伴,如果你想更好的提升你的编程核心能力(内功)不妨从现在开始!编程学习书籍分享:编程学习视频分享:整理分享(多年学习的源码、项目实战视频、项目笔记,基础入门教程)欢迎转行和学习编程的伙伴,利用更多的资料学习成长比自己琢磨更快哦!对于C/C++感兴趣可以关注小编在后台私信我:【编程交流】一起来学习哦!可以领取一些C/C++的项目学习视频资料哦!已经设置好了关键词自动回复,自动领取就好了!暖风除雾需要提前对车窗进行干燥,所以不适合路上紧急情况除雾。但是北方的天气,只适合暖风除雾,0度以下只能这么干。

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2024年(Nian)7月(Yue)9日(Ri),中(Zhong)国(Guo)儿(Er)童(Tong)少(Shao)年(Nian)基(Ji)金(Jin)会(Hui)白(Bai)癜(Zuo)风(Feng)“告(Gao)白(Bai)行(Xing)动(Dong)”《美(Mei)丽(Li)心(Xin)灵(Ling) 健(Jian)康(Kang)成(Cheng)长(Chang)》快(Kuai)乐(Le)课(Ke)堂(Tang)开(Kai)课(Ke),课(Ke)堂(Tang)主(Zhu)题(Ti)以(Yi)“独(Du)特(Te)的(De)我(Wo):认(Ren)识(Shi)自(Zi)我(Wo),接(Jie)纳(Na)差(Cha)异(Yi)”,不(Bu)仅(Jin)是(Shi)对(Dui)孩(Hai)子(Zi)们(Men)内(Nei)心(Xin)的(De)探(Tan)索(Suo),更(Geng)是(Shi)对(Dui)他(Ta)们(Men)勇(Yong)敢(Gan)面(Mian)对(Dui)生(Sheng)活(Huo)、接(Jie)纳(Na)自(Zi)我(Wo)的(De)一(Yi)次(Ci)鼓(Gu)励(Li)。

本文关键词:群体心理、心理学笑闹了一会儿,已经很晚了,十一点多了,赵慧萍让他赶紧去休息,放假一天,可不能浪费一点儿时间。...的另类文学代表作品:《曼娜回忆录》和《少女的心》陈曼娜个人资料/图片/视频全集-陈曼娜的电影电视剧作品-搜...

投身车网互动与智慧能源的变革浪潮

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