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pointer指向并读取记忆体位址问题

2013-12-07 06:30:18 177 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

bob76012 墨衍会员 · AI 创作全网分发关注 + 加入社区

Ubuntu22.04 上ROS1 Noetic的安装与常见问题解决本文详细介绍了在Ubuntu 22.04系统上安装ROS1 Noetic的两种主要方法：推荐使用社区维护的适配仓库进行便捷安装，并提供了从源码编译的备选方案。文章重点解决了安装后编译ROS包时极易遇到的“shared_mutex”等C++标准库冲突问题，并给出了其他常见错误的排查与解决指南，帮助开发者顺利搭建稳定的ROS开发环境。阅读详情

我在一个工程简单写了变数
a = 10
并输出记忆体位址
并编译执行
然后我再开另一个工程
把显示的记忆体位址填入
b
cout << b << endl;//显示记忆体位址正确
cout << *b << endl;//error读取失败了
为什么呢
应该是显示10才对不是吗?

...全文

WIFI信号状态信息 CSI 特征提取篇之活动片段提取（五）本环节是特征提取环节，起承上启下的作用：对上，应着数据处理完毕的信号，但是还不能直接进行分析，因为此时信号片段过长，对于活动识别而言，存在非许多目标片段（例如失败不规范的动作、休息间歇等）；对下，具体采取何种活动片段提取策略，需要配合后续采取的活动识别算法进行（深度学习/机器学习，CNN/RNN/LSTM等等），不同的算法适配不同的数据形式，例如CNN一般用于识图，不需要关注时间顺序，LSTM则要求保留时间关系等等，所以本博客后续仅介绍几种分类思路。阅读详情

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晓敬 2013-12-08

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#include <iostream>
int main(int argc,char** argv){
int a=1;
int *b=&a;
std::cout << "a:" << a << std::endl;
std::cout << "*b:" << *b << std::endl;
std::cout << "&a:" << &a << std::endl;
std::cout << "b:" << b << std::endl;
}

赵4老师 2013-12-07

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hProcess=OpenProcess(PROCESS_ALL_ACCESS,FALSE,dwProcessId); ReadProcessMemory The ReadProcessMemory function reads memory in a specified process. The entire area to be read must be accessible, or the operation fails. BOOL ReadProcessMemory( HANDLE hProcess, // handle to the process whose memory is read LPCVOID lpBaseAddress, // address to start reading LPVOID lpBuffer, // address of buffer to place read data DWORD nSize, // number of bytes to read LPDWORD lpNumberOfBytesRead // address of number of bytes read ); Parameters hProcess Handle to the process whose memory is being read. The handle must have PROCESS_VM_READ access to the process. lpBaseAddress Pointer to the base address in the specified process to be read. Before any data transfer occurs, the system verifies that all data in the base address and memory of the specified size is accessible for read access. If this is the case, the function proceeds; otherwise, the function fails. lpBuffer Pointer to a buffer that receives the contents from the address space of the specified process. nSize Specifies the requested number of bytes to read from the specified process. lpNumberOfBytesRead Pointer to the actual number of bytes transferred into the specified buffer. If lpNumberOfBytesRead is NULL, the parameter is ignored. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError. The function fails if the requested read operation crosses into an area of the process that is inaccessible. Remarks ReadProcessMemory copies the data in the specified address range from the address space of the specified process into the specified buffer of the current process. Any process that has a handle with PROCESS_VM_READ access can call the function. The process whose address space is read is typically, but not necessarily, being debugged. The entire area to be read must be accessible. If it is not, the function fails as noted previously. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Unsupported. Header: Declared in winbase.h. Import Library: Use kernel32.lib. See Also Debugging Overview, Debugging Functions, WriteProcessMemory, ReadProcessMemoryVlm

碼上道 2013-12-07

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两个工程，是两个不同的进程

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pointer指向并读取记忆体位址问题

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