##这里包含一些编程过程中的记录,遇到的问题
....
```cpp
服务器端安全可靠的后台运行工具:
nohup ./ser > serLog.out 2>&1 &
nohup ./FTS > FTSLog.out 2>&1 &
服务器端输出重定向到:serLog.out 和 FTSLog.out
使用 jobs 查看任务
使用 fg %n 关闭
//查找用户‘qqq’的文件列表
select user_id,filename,size,type from user,files where user.user_id='qqq' and user.file_id=files.id;
//查找用户‘qqq’的好友列表
select friends.user_id from user,friends where user.user_id='qqq' and user.friends_id=friends.id;
//注册用户
insert into user(user_id,password) select '用户名','密码' from dual where not exists(select *from user where user.user_id='用户名');
//编译mysql需要加上
-L/usr/lib/mysql -lmysqlclient
//编译mysql连接池时,使用的时libmysqlcppconn接口,需要加上
-L/usr/lib/mysql -lmysqlcppconn
//用于 用户登录 查询,存在返回记录条数,不存在返回0
select exists(select *from user where user_id='用户名' and password='密码');
//mysql编译
g++ -o MyDB MyDB.cpp MyDB.h public.h -L/usr/lib/mysql -lmysqlclient
//问题1:undefined reference to `conCli::do_work()'
//需将引用到的.cpp文件生成.a库文件
g++ -c conCli.cpp //.o
ar -rc conCli.a conCli.o
//编译时加上生成的.a库文件
//客户端生成可执行文件
g++ -o Cli testcli.cpp conCli.a
//服务器端生成可执行文件
g++ -c conSer.cpp
ar -rc conCli.a conCli.o
g++ -o Ser testser.cpp conSer.a
//问题2: multiple definition of `msg'
在所以全局变量前加static关键字或在public.h头文件声明extern关键字
//问题3:错误:no match 为‘operator<’在‘std::bind(_Functor, _ArgTypes ...) [with _Functor = int, _ArgTypes = sockaddr*, unsigned int](((sockaddr*)(&((conSer*)this)->conSer::seraddr)), 16u) < 0’中
由于memcached的调用涉及到C++11标准(即在编译时需要加上--std=gnu++0x),所以Socket下的bind()函数和STL下的bind()函数发生冲突
解决方法:
1.在使用socket下的bind()函数所在的类中禁止使用using namespace std;由于调试需要,这种办法不可取
2.在使用socket下的bind()函数时,在bind()前加“::”运算符
memcached启动:
/usr/local/bin/memcached -m 10 -u root -l 127.0.0.1 -p 11211 -c 256 -vv
```
```cpp
"Segmentation Fault"
段错误是指访问的内存超出了系统给这个程序所设定的内存:
1、访问不存在的内存地址
2、访问系统保护的内存地址
3、访问只读的内存地址
4、栈溢出
查看详细的段错误信息:
1、dmesg: 通过dmesg命令可以查看发送段错误的程序名称、引起段错误发生的内存地址、指令指针地址、堆栈指针地址、错误代码、错误原因等
2、gcc/g++编译程序源码加上-g参数,用于gdb调试,显示错误信息(但是多进程下gdb调试比较困难,我一般用cout在关键地方输出信息)
3、nm ./可执行程序:列出二进制文件中的符号表(符号地址、类型、名),可以帮助定位错误地方
4、ldd ./可执行程序: 查看二进制程序的共享链接库依赖,包括库的名称、起始地址,可确定段错误发生的库(自己的库还是依赖的库)
5、objdump: 先用dmesg找出最近发生的段错误输出信息(段错误地址、指令指针地址)
然后使用objdump生成二进制的相关信息:objdump -d ./可执行程序 > dumpfile
dumpfile重定向文件包含可执行程序的汇编代码,从中查找dmesg输出的发生错误的地址,定位原程序
注意事项
段错误主要出现在指针的使用地方,定义时初始化,使用时判 NULL,Glibc库中基本所有的函数默认形参指针为非空
数组下标是否越界,数组元素是否存在
是否访问了已经释放的空间
printf/scanf的格式控制是否合理
```
没有合适的资源?快使用搜索试试~ 我知道了~
linux下c、c++模拟实现云盘项目.zip
![preview](https://csdnimg.cn/release/downloadcmsfe/public/img/white-bg.ca8570fa.png)
共35个文件
h:12个
cpp:12个
makefile:3个
![preview-icon](https://csdnimg.cn/release/downloadcmsfe/public/img/scale.ab9e0183.png)
需积分: 5 0 下载量 60 浏览量
2024-07-02
15:38:30
上传
评论
收藏 100KB ZIP 举报
温馨提示
linux下c、c++模拟实现云盘项目.zip
资源推荐
资源详情
资源评论
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![tgz](https://img-home.csdnimg.cn/images/20210720083646.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![exe](https://img-home.csdnimg.cn/images/20210720083343.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
收起资源包目录
![package](https://csdnimg.cn/release/downloadcmsfe/public/img/package.f3fc750b.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![folder](https://csdnimg.cn/release/downloadcmsfe/public/img/folder.005fa2e5.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
![file-type](https://csdnimg.cn/release/download/static_files/pc/images/minetype/UNKNOWN.png)
共 35 条
- 1
资源评论
![avatar-default](https://csdnimg.cn/release/downloadcmsfe/public/img/lazyLogo2.1882d7f4.png)
![avatar](https://profile-avatar.csdnimg.cn/72a9936e28d84a44b8d02dcbe3729b26_m0_62143653.jpg!1)
Matlab仿真实验室
- 粉丝: 3w+
- 资源: 2220
上传资源 快速赚钱
我的内容管理 展开
我的资源 快来上传第一个资源
我的收益
登录查看自己的收益我的积分 登录查看自己的积分
我的C币 登录后查看C币余额
我的收藏
我的下载
下载帮助
![voice](https://csdnimg.cn/release/downloadcmsfe/public/img/voice.245cc511.png)
![center-task](https://csdnimg.cn/release/downloadcmsfe/public/img/center-task.c2eda91a.png)
安全验证
文档复制为VIP权益,开通VIP直接复制
![dialog-icon](https://csdnimg.cn/release/downloadcmsfe/public/img/green-success.6a4acb44.png)