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黄卷青灯77
c++算法开发语言iostreamstdio
在C++中,iostream和C语言的stdio.h都是用于处理输入输出的库,但它们在设计、用法和功能上有许多不同。以下是两者的区别和联系:区别1.编程风格iostream(C++风格):C++标准库中的输入输出流类库,支持面向对象的输入输出操作。典型用法是cin(输入)和cout(输出),使用>操作符来处理数据。更加类型安全,支持用户自定义类型的输入输出。#includeintmain(){in
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mmaerd
Leetcode刷题学习记录leetcode算法职场和发展
重新安排行程Leetcode332学习记录自代码随想录给你一份航线列表tickets,其中tickets[i]=[fromi,toi]表示飞机出发和降落的机场地点。请你对该行程进行重新规划排序。所有这些机票都属于一个从JFK(肯尼迪国际机场)出发的先生,所以该行程必须从JFK开始。如果存在多种有效的行程,请你按字典排序返回最小的行程组合。例如,行程[“JFK”,“LGA”]与[“JFK”,“LGB
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互联网打工人no1
c#
1、用字符串分隔:usingSystem.Text.RegularExpressions;stringstr="aaajsbbbjsccc";string[]sArray=Regex.Split(str,"js",RegexOptions.IgnoreCase);foreach(stringiinsArray)Response.Write(i.ToString()+"");输出结果:aaabbbc
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qq_42772833
SQLServer数据库sqlserver
1.查看所有表的表名要列出CrabFarmDB数据库中的所有表(名),可以使用以下SQL语句:USECrabFarmDB;--切换到目标数据库GOSELECTTABLE_NAMEFROMINFORMATION_SCHEMA.TABLESWHERETABLE_TYPE='BASETABLE';对这段SQL脚本的解释:SELECTTABLE_NAME:这个语句的作用是从查询结果中选择TABLE_NAM
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l939035548
JS算法数据结构c++
题目为了充分发挥GPU算力,需要尽可能多的将任务交给GPU执行,现在有一个任务数组,数组元素表示在这1秒内新增的任务个数且每秒都有新增任务。假设GPU最多一次执行n个任务,一次执行耗时1秒,在保证GPU不空闲情况下,最少需要多长时间执行完成。题目输入第一个参数为GPU一次最多执行的任务个数,取值范围[1,10000]第二个参数为任务数组长度,取值范围[1,10000]第三个参数为任务数组,数字范围
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GPJnCrbBdl
python开发语言
基于codesys开发的多轴运动控制程序框架,将逻辑与运动控制分离,将单轴控制封装成功能块,对该功能块的操作包含了所有的单轴控制(归零、点动、相对定位、绝对定位、设置当前位置、伺服模式切换等等)。程序框架由主程序按照状态调用分归零模式、手动模式、自动模式、故障模式,程序状态的跳转都已完成,只需要根据不同的工艺要求完成所需的动作即可。变量的声明、地址的规划都严格按照C++的标准定义,能帮助开发者快速
- C++ | Leetcode C++题解之第409题最长回文串
Ddddddd_158
经验分享C++Leetcode题解
题目:题解:classSolution{public:intlongestPalindrome(strings){unordered_mapcount;intans=0;for(charc:s)++count[c];for(autop:count){intv=p.second;ans+=v/2*2;if(v%2==1andans%2==0)++ans;}returnans;}};
- C++菜鸟教程 - 从入门到精通 第二节
DreamByte
c++
一.上节课的补充(数据类型)1.前言继上节课,我们主要讲解了输入,输出和运算符,我们现在来补充一下数据类型的知识上节课遗漏了这个知识点,非常的抱歉顺便说一下,博主要上高中了,更新会慢,2-4周更新一次对了,正好赶上中秋节,小编跟大家说一句:中秋节快乐!2.int类型上节课,我们其实只用了int类型int类型,是整数类型,它们存贮的是整数,不能存小数(浮点数)定义变量的方式很简单inta;//定义一
- mac电脑命令行获取电量
小米人er
我的博客macos命令行
在macOS上,有几个命令行工具可以用来获取电量信息,最常用的是pmset命令。你可以通过以下方式来查看电池状态和电量信息:查看电池状态:pmset-gbatt这个命令会返回类似下面的输出:Nowdrawingfrom'BatteryPower'-InternalBattery-0(id=1234567)95%;discharging;4:02remainingpresent:true输出中包括电
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_feivirus_
算法机器学习和数学分类机器学习K近邻
importnumpyasnpimportpandasaspdfromsklearn.datasetsimportload_irisfromsklearn.model_selectionimporttrain_test_splitfromsklearn.metricsimportaccuracy_score1.数据预处理iris=load_iris()df=pd.DataFrame(data=ir
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芒果不是芒
Java面试题精选javakafka
一、Kafka的特性1.消息持久化:消息存储在磁盘,所以消息不会丢失2.高吞吐量:可以轻松实现单机百万级别的并发3.扩展性:扩展性强,还是动态扩展4.多客户端支持:支持多种语言(Java、C、C++、GO、)5.KafkaStreams(一个天生的流处理):在双十一或者销售大屏就会用到这种流处理。使用KafkaStreams可以快速的把销售额统计出来6.安全机制:Kafka进行生产或者消费的时候会
- 用Python实现读取统计单词个数
程序媛了了
python游戏java
完整实例代码:fromcollectionsimportCounterdefpythonit():danci={}withopen("pythonit.txt","r",encoding="utf-8")asf:foriinf:words=i.strip().split()forwordinwords:ifwordnotindanci:danci[word]=1else:danci[word]+=
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Ambition_LAO
深度学习
BART和BERT都是基于Transformer架构的预训练语言模型。模型架构:BERT(BidirectionalEncoderRepresentationsfromTransformers)主要是一个编码器(Encoder)模型,它使用了Transformer的编码器部分来处理输入的文本,并生成文本的表示。BERT特别擅长理解语言的上下文,因为它在预训练阶段使用了掩码语言模型(MLM)任务,即
- python tif转png
Python与遥感
python开发语言
importosfromosgeoimportgdalimportnumpyasnpfromPILimportImage#提取432三波段fromspectralimport*#输入文件夹路径defget_img(dataset_img):width=dataset_img.RasterXSize#获取行列数height=dataset_img.RasterYSizebands=dataset_i
- react-intl——react国际化使用方案
苹果酱0567
面试题汇总与解析java开发语言中间件springboot后端
国际化介绍i18n:internationalization国家化简称,首字母+首尾字母间隔的字母个数+尾字母,类似的还有k8s(Kubernetes)React-intl是React中最受欢迎的库。使用步骤安装#usenpmnpminstallreact-intl-D#useyarn项目入口文件配置//index.tsximportReactfrom"react";importReactDOMf
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barbyQAQ
c++c++java算法
原文链接:https://blog.csdn.net/qq_51470638/article/details/142151502一、背景在面向对象编程时,常常要添加类成员变量。然而类成员一旦多了之后,也会带来干扰。拿到一个类,一看成员变量好几十个,就问你怕不怕?二、解决思路可以借助函数式编程思想,来消除一些不必要的类成员变量。三、实例举个例子:classClassA{public:...intfu
- 2021 CCF 非专业级别软件能力认证第一轮(CSP-J1)入门级C++语言试题 (第三大题:完善程序 代码)
mmz1207
c++csp
最近有一段时间没更新了,在准备CSP考试,请大家见谅。(1)有n个人围成一个圈,依次标号0到n-1。从0号开始,依次0,1,0,1...交替报数,报到一的人离开,直至圈中剩最后一个人。求最后剩下的人的编号。#includeusingnamespacestd;intf[1000010];intmain(){intn;cin>>n;inti=0,cnt=0,p=0;while(cnt#includeu
- 《 C++ 修炼全景指南:九 》打破编程瓶颈!掌握二叉搜索树的高效实现与技巧
Lenyiin
C++修炼全景指南技术指南c++算法stl
摘要本文详细探讨了二叉搜索树(BinarySearchTree,BST)的核心概念和技术细节,包括插入、查找、删除、遍历等基本操作,并结合实际代码演示了如何实现这些功能。文章深入分析了二叉搜索树的性能优势及其时间复杂度,同时介绍了前驱、后继的查找方法等高级功能。通过自定义实现的二叉搜索树类,读者能够掌握其实际应用,此外,文章还建议进一步扩展为平衡树(如AVL树、红黑树)以优化极端情况下的性能退化。
- 20个新手学习c++必会的程序 输出*三角形、杨辉三角等(附代码)
X_StarX
c++学习算法大学生开发语言数据结构
示例1:HelloWorld#includeusingnamespacestd;intmain(){coutusingnamespacestd;intmain(){inta=5;intb=10;intsum=a+b;coutusingnamespacestd;intfactorial(intn){if(nusingnamespacestd;voidprintFibonacci(intn){intt
- C++八股
Petrichorzncu
八股总结c++开发语言
这里写目录标题C++内存管理C++的构造函数,复制构造函数,和析构函数深复制与浅复制:构造函数和析构函数哪个能写成虚函数,为什么?C++数据结构内存排列结构体和类占用的内存:==虚函数和虚表的原理==虚函数虚表(Vtable)虚函数和虚表的实现细节==内存泄漏==指针的工作原理函数的传值和传址new和delete与malloc和freeC++内存区域划分C++11新特性C++常见新特性==智能指针
- [Unity]在场景中随机生成不同位置且不重叠的物体
Bartender_Jill
Graphics图形学笔记unity游戏引擎动画
1.前言最近任务需要用到Unity在场景中随机生成物体,且这些物体不能重叠,简单记录一下。参考资料:Howtoensurethatspawnedtargetsdonotoverlap?2.结果与代码结果如下所示:代码如下所示:usingSystem.Collections.Generic;usingUnityEngine;namespaceAssets.Scripts{publicclassNew
- 【2022 CCF 非专业级别软件能力认证第一轮(CSP-J1)入门级 C++语言试题及解析】
汉子萌萌哒
CCFnoi算法数据结构c++
一、单项选择题(共15题,每题2分,共计30分;每题有且仅有一个正确选项)1.以下哪种功能没有涉及C++语言的面向对象特性支持:()。A.C++中调用printf函数B.C++中调用用户定义的类成员函数C.C++中构造一个class或structD.C++中构造来源于同一基类的多个派生类题目解析【解析】正确答案:AC++基础知识,面向对象和类有关,类又涉及父类、子类、继承、派生等关系,printf
- 《 C++ 修炼全景指南:十 》自平衡的艺术:深入了解 AVL 树的核心原理与实现
Lenyiin
C++修炼全景指南技术指南c++数据结构stl
摘要本文深入探讨了AVL树(自平衡二叉搜索树)的概念、特点以及实现细节。我们首先介绍了AVL树的基本原理,并详细分析了其四种旋转操作,包括左旋、右旋、左右双旋和右左双旋,阐述了它们在保持树平衡中的重要作用。接着,本文从头到尾详细描述了AVL树的插入、删除和查找操作,配合完整的代码实现和详尽的注释,使读者能够全面理解这些操作的执行过程。此外,我们还提供了AVL树的遍历方法,包括中序、前序和后序遍历,
- COCO 格式的数据集转化为 YOLO 格式的数据集
QYQY77
YOLOpython
"""--json_path输入的json文件路径--save_path保存的文件夹名字,默认为当前目录下的labels。"""importosimportjsonfromtqdmimporttqdmimportargparseparser=argparse.ArgumentParser()parser.add_argument('--json_path',default='./instances
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victorfreedom
Java技术设计模式androidjava常用设计模式
博主最近买了《设计模式》这本书来学习,无奈这本书是以C++语言为基础进行说明,整个学习流程下来效率不是很高,虽然有的设计模式通俗易懂,但感觉还是没有充分的掌握了所有的设计模式。于是博主百度了一番,发现有大神写过了这方面的问题,于是博主迅速拿来学习。一、设计模式的分类总体来说设计模式分为三大类:创建型模式,共五种:工厂方法模式、抽象工厂模式、单例模式、建造者模式、原型模式。结构型模式,共七种:适配器
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图像处理大大大大大牛啊
图像处理opencv实战代码讲解opencvsiftc++opencv4特征点
c++opencv4.3sift匹配main.cppintmain(){vectorkeypoints1,keypoints2;Matimg1,img2,descriptors1,descriptors2;intnumF
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Lenyiin
技术指南C++修炼全景指南c++list链表stl
本篇博客,我们将详细讲解如何从头实现一个功能齐全且强大的C++List容器,并深入到各个细节。这篇博客将包括每一步的代码实现、解释以及扩展功能的探讨,目标是让初学者也能轻松理解。一、简介1.1、背景介绍在C++中,std::list是一个基于双向链表的容器,允许高效的插入和删除操作,适用于频繁插入和删除操作的场景。与动态数组不同,list允许常数时间内的插入和删除操作,支持双向遍历。这篇文章将详细
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heeheeai
c++开发语言
在C语言的头文件中,memcpy和memmove函数都用于复制内存块,但它们在处理内存重叠方面存在关键区别:内存重叠:memcpy函数不保证在源内存和目标内存区域重叠时能够正确复制数据。如果内存区域重叠,memcpy的行为是未定义的,可能会导致数据损坏或程序崩溃。memmove函数能够安全地处理源内存和目标内存区域重叠的情况。它会确保在复制过程中不会覆盖尚未复制的数据,从而保证数据的完整性。效率:
- Python3.7出现“ModuleNotFoundError: No module named ‘Tkinter‘”错误的解决方法
可爱的小红猪
python
Python3.7出现“ModuleNotFoundError:Nomodulenamed‘Tkinter’”错误的解决方法在网上看到很多针对这个问题的解决方法都是重新安装或配置Tkinter库,但Tkinter是python内置的标准GUI库,安装Python时就已经内置在了库中,不需要另外下载。针对于Tkinter,你的代码很可能是这样的:importTkinter或者是这样fromTkint
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XWWW668899
C++基本概念c++c语言开发语言青少年编程
文章目录概要技术名词解释栈溢出和堆溢出小结概要学习C++语言,避免不了要好好理解一下堆(Heap)和栈(Stack),有助于更好地管理内存,以及如何写出一段程序“成功实现”堆溢出和栈溢出。技术名词解释理解东西最快的方式是根据自己目前能理解的词语去关联新的概念,不断的纠正,向正确的深度理解靠近,当无限接近的时候也就理解了想要理解的概念。我们经常说堆栈,把这两个名词放到一起。其实,堆是堆,栈是栈,两种
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周凡杨
javaHttpServlet源理GenericService源码
在上一篇《解读Servlet原理篇一》中提到,要实现javax.servlet.Servlet接口(即写自己的Servlet应用),你可以写一个继承自javax.servlet.GenericServletr的generic Servlet ,也可以写一个继承自java.servlet.http.HttpServlet的HTTP Servlet(这就是为什么我们自定义的Servlet通常是exte
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bijian1013
数据库mysql
性能优化是通过某些有效的方法来提高MySQL的运行速度,减少占用的磁盘空间。性能优化包含很多方面,例如优化查询速度,优化更新速度和优化MySQL服务器等。本文介绍方法的主要有:
a.优化查询
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dai_lm
javaThreadPoolthreadtimertimertask
项目需要当某事件触发时,执行http请求任务,失败时需要有重试机制,并根据失败次数的增加,重试间隔也相应增加,任务可能并发。
由于是耗时任务,首先考虑的就是用线程来实现,并且为了节约资源,因而选择线程池。
为了解决不定间隔的重试,选择Timer和TimerTask来完成
package threadpool;
public class ThreadPoolTest {
- Oracle 查看数据库的连接情况
周凡杨
sqloracle 连接
首先要说的是,不同版本数据库提供的系统表会有不同,你可以根据数据字典查看该版本数据库所提供的表。
select * from dict where table_name like '%SESSION%';
就可以查出一些表,然后根据这些表就可以获得会话信息
select sid,serial#,status,username,schemaname,osuser,terminal,ma
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朱辉辉33
java
类的继承可以提高代码的重用行,减少冗余代码;还能提高代码的扩展性。Java继承的关键字是extends
格式:public class 类名(子类)extends 类名(父类){ }
子类可以继承到父类所有的属性和普通方法,但不能继承构造方法。且子类可以直接使用父类的public和
protected属性,但要使用private属性仍需通过调用。
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- android 悬浮窗特效
肆无忌惮_
android
最近在开发项目的时候需要做一个悬浮层的动画,类似于支付宝掉钱动画。但是区别在于,需求是浮出一个窗口,之后边缩放边位移至屏幕右下角标签处。效果图如下:
一开始考虑用自定义View来做。后来发现开线程让其移动很卡,ListView+动画也没法精确定位到目标点。
后来想利用Dialog的dismiss动画来完成。
自定义一个Dialog后,在styl
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林鹤霄
hadoop
要修改4个文件 1: vim hadoop-env.sh 第九行 2: vim core-site.xml <configuration> &n
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aigo
gdb
原文:http://blog.csdn.net/hanchaoman/article/details/5517362
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r run 运行.程序还没有运行前使用 c cuntinue 
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alleni123
socket
public class Client
{
public static void main(String[] args)
{
Client c=new Client();
c.receiveMessage();
}
public void receiveMessage(){
Socket s=null;
BufferedRea
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百合不是茶
线程同步异步
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多线程和异步:多线程可以做不同的事情,涉及到线程通知
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bijian1013
javajsp中文乱码
在JSP的开发过程中,经常出现中文乱码的问题。
首先了解一下Java中文问题的由来:
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bit1129
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在【Struts2一】 Struts Hello World http://bit1129.iteye.com/blog/2109365中配置了一个简单的Action,配置如下
<!DOCTYPE struts PUBLIC
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bit1129
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Admin类的主要方法注释:
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/**
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*
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nginx gzip
Nginx GZip 压缩
Nginx GZip 模块文档详见:http://wiki.nginx.org/HttpGzipModule
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gzip on; gzip_comp_level 2; # 压缩比例,比例越大,压缩时间越长。默认是1 gzip_types text/css text/javascript; # 哪些文件可以被压缩 gzip_disable &q
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bylijinnan
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public class LinkListTest {
/**
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*
* A.
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Spring JdbcTemplate的batch操作最后还是利用了JDBC提供的方法,Spring只是做了一下改造和封装
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生成和创建类已经完成,构造一个100万个元素的矩阵模型,存储空间只有11M大,请大家参考我在博客园上面的文档"构造下一代工作流存储结构的尝试",更加相信的设计和代码将陆续推出.........
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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关于使用 memcached 或redis 存储 session ,以及使用 terracotta 服务器共享。建议使用 redis,不仅仅因为它可以将缓存的内容持久化,还因为它支持的单个对象比较大,而且数据类型丰富,不只是缓存 session,还可以做其他用途,一举几得啊。1、使用 filter 方法存储这种方法比较推荐,因为它的服务器使用范围比较多,不仅限于tomcat ,而且实现的原理比较简
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dcj3sjt126com
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public function getMinLimit () { $sql = "..."; $result = yii::app()->db->createCo
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solr聚合查询solr stats
StatsComponent
转载请出自出处:http://eksliang.iteye.com/blog/2169134
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Solr可以利用StatsComponent 实现数据库的聚合统计查询,也就是min、max、avg、count、sum的功能
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位运算百度面试寻找奇数算法bitmap 算法
那天看朋友提了一个百度面试的题目:怎么找出{1,1,2,3,3,4,4,4,5,5,5,5} 找出出现次数为奇数的数字.
我这里复制的是原话,当然顺序是不一定的,很多拿到题目第一反应就是用map,当然可以解决,但是效率不高。
还有人觉得应该用算法xxx,我是没想到用啥算法好...!
还有觉得应该先排序...
还有觉
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在实际开发中使用SpringJDBC有两种方式:
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JdbcTemplate类被设计成为线程安全的,所以可以在IOC 容器中声明它的单个实例,并将这个实例注入到所有的 DAO 实例中。JdbcTemplate也利用了Java 1.5 的特定(自动装箱,泛型,可变长度
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justjavac
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2013年5月,Yehuda Katz 完成了JSON API(英文,中文) 技术规范的初稿。事情就发生在 RailsConf 之后,在那次会议上他和 Steve Klabnik 就 JSON 雏形的技术细节相聊甚欢。在沟通单一 Rails 服务器库—— ActiveModel::Serializers 和单一 JavaScript 客户端库——&
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macroli
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一.概念
网站项目管理就是根据特定的规范、在预算范围内、按时完成的网站开发任务。
二.需求分析
项目立项
我们接到客户的业务咨询,经过双方不断的接洽和了解,并通过基本的可行性讨论够,初步达成制作协议,这时就需要将项目立项。较好的做法是成立一个专门的项目小组,小组成员包括:项目经理,网页设计,程序员,测试员,编辑/文档等必须人员。项目实行项目经理制。
客户的需求说明书
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每天进步一点点学习永无止境众观千象AngularJS
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var b = "{{",
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superlxw1234
sparkspark算子Spark RDD分区元素
关键字:Spark算子、Spark RDD分区、Spark RDD分区元素数量
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Spring 团队公布在2016年12月31日停止对Spring Framework 3.2.x(包含tomcat 6.x)的支持。在此之前spring团队将持续发布3.2.x的维护版本。
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- fis纯前端解决方案fis-pure
zccst
JavaScript
作者:zccst
FIS通过插件扩展可以完美的支持模块化的前端开发方案,我们通过FIS的二次封装能力,封装了一个功能完备的纯前端模块化方案pure。
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$ fis install -g fis-pure
$ pure -v
0.1.4
2,下载demo到本地
git clone https://github.com/hefangshi/f
hey!! thanks a lot for this sample code! i have been struggling with libcurl and thinking of moving on to ptypes! but now i can see things way more clear ~! thanks a lot
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Luckyspin reply on June 8th, 2006 8:34 am:
No problem! Glad my little code snippet helped out. I think sticking with libcurl is going to be a big benefit. It’s way more powerful than ptypes when you really get into the nitty gritty of doing http calls.
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freakydoc reply on July 29th, 2006 3:17 pm:
I would like also to thank for your example. Even with the good documentation of CURL, nothing can be so helpful as a simple example. Thanks again.
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Thanks thanks thanks, i feel dumb saying this but this post is what i needed to start my own project. (duh, it seems any other samples/tutorials were not enough for me).
Thanks for sharing the code and your experience.
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Thanks for the code! I was looking for simple curl/C++ example, and couldn’t find one.
BTW, spaces between <’s after cout prevent compilation (so simple copy-paste doesn’t work).
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Luckyspin reply on November 29th, 2006 9:00 pm:
Yeah, it’s weird. I’ve tried deleting them but everytime I save the post, WP seems to add them back. Grr!
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Simple, perfect and to the point
thanks for the sample code
it really help me to download the urls
thanks again
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sai reply on October 30th, 2008 9:49 pm:
Error: [7] - couldn’t connect to host error occurs while running the program.
can u tell me how to compile this code and run.
thanks
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Nice snippet
But I would use stdio.h instead iostream…
anyway, thx for the code =))
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Thanks for the code snippet, invaluable!
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Thank you very, very much for this little script. I was screwing around with libcurl, and couldn’t figure out why it didn’t work. But with your script as reference, I can easily fetch a page, login to a forum and so on.
Thank you very much!
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Ben reply on June 23rd, 2008 8:54 am:
Hi Hamil,
Hope you are doing wonderful. I have just started learning libcurl and I am trying to login to a website. Would you like to share me with the piece of code, that does the logging. Thank you for posting your comments and the success adventure with libcurl.
Have a wonderful day !
-Biranchi
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Well, a neat but a little bit incomplete tutorial, from the official site you could find:
http://curl.haxx.se/libcurl/c/libcurl-tutorial.html
where you may get more comprehensive info from compliation/linking and code snippets…
cheers
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Luckyspin reply on April 23rd, 2007 7:26 pm:
Yeah I know the docs are all there, but when I went looking I couldn’t find a simple example to just get me started. Hence this little snippet. Apparently it’s been useful to a few people so that’s cool =)
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Yes, I agree with everyone. This explanation and code snippet is very very helpful to me! Yes, fjordan, there is the detailed libcurl tutorial, but this snippet gets you started fast, then you can refer to the tutorial as a next step. Thanks Todd!
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Brilliant thank you. I was looking for this the whole night
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could it be that I must free or clean the buffer? i try to us this in a class an my ram grows all the time?
Thx for this cool example!!
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Thanks for this. It really helped me out!
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Hi! I’am from Poland, sorry in my language.
How to uploading files / images in cURL ?
Please any example… plisse
Thanks You Very Much!!!
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Thanks for that snippet - you just saved me a lot of time reading the docs.
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Thanks, sometime I also want to use java to realize your idea.
http://www.greatnotebook.com/libcurl.html
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Thanks for this. I too was having some problems getting a string buffer in C++ filled from the callbacks in libcurl. Cheers!
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Thanks a lot!! a very useful code!!
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Thank you!
Great code!
It will be nice if you have a snippet like this for using SSL with libcurl!
Please let me know if you have
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Luckyspin reply on April 27th, 2008 7:52 pm:
I haven’t ever tried it with SSL I’m afraid. If you do, let me know how you did it. Thanks!
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[...] course, I could be writing about the Twitter outages, but why follow the sheep? ;)] Take my post on using libcurl with C++. This was something that I threw out there a couple of years ago as a result of a small project on [...]
Thanks. I was looking for a simple libcurl example to do just this. I’ll be sure to check out your other posts.
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Luckyspin reply on June 13th, 2008 3:09 pm:
Hey, no worries. Glad it was useful. What did you end up doing with it?
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Austin K reply on June 14th, 2008 6:35 am:
I was bored and thought about writing a quick C++ app that could pull stock quotes from the Internet. I found out that Yahoo offers CSV files of stock market data so I just needed a way to pull them off their website. I thought about writing my own HTTP parser, but then I discovered curl, libcurl, and this example.
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Thanks for the code, I got to get it running immediately just after a minor modification. Now I want to do a log in to a web page. From one website I came to know in php I can use curl_exec and curl_getinfo to pass the post data information.
I also want to get a particular xml file from the website and then modify it and send it back to the website.
If anyone has done similar things before, your advice will be highly appreciated.
-Biranchi
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I was trying to find some simple curl/C++ examples, but couldn’t find any. This code snippet is invaluable! Thanks again!
Cheers from Latvia
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Hey!
I’ve got some code which is 95% of what you have here, and the rest is just appending a file extension to the file name, then saving the recieved data to file, rather than sending to to std:cout. It works perfectly when directed to html documents, but trying to open other types (I’ve tried doc and pdf), it seems the file ends up partially corrupted. The size seems to match, but it’s just generally unreadable.
What is strange is that by enabling CURLOPT_VERBOSE, I see that the connection feedback does seem to be correctly interpreting the content type.
Is there something futher needed to be done for non-html documents?
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Luckyspin reply on July 4th, 2008 7:30 am:
That’s a good question. I’m not exactly sure to be honest. Perhaps there is a different curl option that needs to be set? Also, what happens if you do a diff between the file you downloaded using your program and the original binary file?
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Aaron reply on July 4th, 2008 12:45 pm:
Hey never mind any of that, I figured it out. I needed to open the file stream with (ios::binary | ios::out) because certain bitpatterns would prematurely terminate the operation, for this particular use =)
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Luckyspin reply on July 4th, 2008 12:49 pm:
That’s good to know!
Oh, I should explain… the parameter passed to the program only determines the file name at the moment. The actual URL is constant and is just a random pdf from the internet
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You, sir, are a libcurl legend. How much do we owe you for this awesomeness?
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Luckyspin reply on August 15th, 2008 8:13 am:
As I’ve said before there is no charge for awesomeness!
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Great! Thanks! Now I exactly rewriting my RSS parser for site on C++, since I nube in Linux this code is great example what I must do… One question: how can I put to request needed headers like User-Agent and so on?
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Hello!
I’m writing a webcrawler that will save an html file from an input url and I want to use libcurl. I downloaded the zip file for the library and now I’m not sure what to do to make it work in NetBeans IDE. If you could help it would be GREATLY appreciated. Also, your sample code provides a great example for using the library! Thanks!!
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Luckyspin reply on December 6th, 2008 2:09 pm:
To be honest I don’t know much about the specifics of Netbeans. However, I imagine it’s the same as any other IDE. Create a project, import the files, setup a compiler, away you go. No doubt there are plenty of tutorials in the Netbeans help or from their community. Good luck!
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Nick reply on December 24th, 2008 12:04 pm:
Hi again,
I’ve been trying to get this to work for a long time to no avail, I still get build errors:
g++.exe -c -g -o build/Debug/Cygwin-Windows/webText.o webText.cpp
webText.cpp:3:21: curl.h: No such file or directory
webText.cpp:8: error: `CURL_ERROR_SIZE’ was not declared in this scope
webText.cpp: In function `void usage()’:
webText.cpp:36: error: expected primary-expression before ‘<’ token
webText.cpp:36: error: invalid operands of types `const char[12]‘ and `’ to binary `operator<<’
webText.cpp: In function `int main(int, char**)’:
webText.cpp:49: error: expected primary-expression before ‘<’ token
webText.cpp:49: error: no match for ‘operator<<’ in ‘”Retrieving ” << url’
webText.cpp:52: error: `CURL’ undeclared (first use this function)
webText.cpp:52: error: (Each undeclared identifier is reported only once for each function it appears in.)
webText.cpp:52: error: `curl’ undeclared (first use this function)
webText.cpp:53: error: `CURLcode’ undeclared (first use this function)
webText.cpp:53: error: expected `;’ before “result”
webText.cpp:56: error: `curl_easy_init’ undeclared (first use this function)
webText.cpp:61: error: `CURLOPT_ERRORBUFFER’ undeclared (first use this function)
webText.cpp:61: error: `errorBuffer’ undeclared (first use this function)
webText.cpp:61: error: `curl_easy_setopt’ undeclared (first use this function)
webText.cpp:62: error: `CURLOPT_URL’ undeclared (first use this function)
webText.cpp:63: error: `CURLOPT_HEADER’ undeclared (first use this function)
webText.cpp:64: error: `CURLOPT_FOLLOWLOCATION’ undeclared (first use this function)
webText.cpp:65: error: `CURLOPT_WRITEFUNCTION’ undeclared (first use this function)
webText.cpp:66: error: `CURLOPT_WRITEDATA’ undeclared (first use this function)
webText.cpp:69: error: `result’ undeclared (first use this function)
webText.cpp:69: error: `curl_easy_perform’ undeclared (first use this function)
webText.cpp:72: error: `curl_easy_cleanup’ undeclared (first use this function)
webText.cpp:75: error: `CURL_OK’ undeclared (first use this function)
webText.cpp:86: error: expected `}’ at end of input
make[1]: *** [build/Debug/Cygwin-Windows/webText.o] Error 1
I apologize for the length of the message but I was wondering if you could deduce a solution based on this. When you downloaded the library did you put it in a specific directory?
Thank you very much once again! Happy Holidays!
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Luckyspin reply on January 6th, 2009 9:00 am:
The compile warning is telling you that you have not reference the include files correctly in your setup. You need to download the libcurl source and set up your project to point to the .h files.
hey,
cool article, but i have 1 problem with your code (and really any time i try to use libcurl. i’ve downloaded this: http://curl.haxx.se/latest.cgi?curl=win32-ssl-devel-msvc
(the msvc libcurl download) but when i run your exact code, i get linker errors. I’ve included the “includes/” directory which contain all .h files, but the linker error is coming back with something about unresolved external symbols. this obviously means these 4 symbols aren’t defined anywhere, but they’re in easy.h.
here are the errors:
Error 1 error LNK2019: unresolved external symbol __imp__curl_easy_cleanup referenced in function _main curl-test.obj
Error 2 error LNK2019: unresolved external symbol __imp__curl_easy_perform referenced in function _main curl-test.obj
Error 3 error LNK2019: unresolved external symbol __imp__curl_easy_setopt referenced in function _main curl-test.obj
Error 4 error LNK2019: unresolved external symbol __imp__curl_easy_init referenced in function _main curl-test.obj
any assistance would be greatly appreciated.
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Luckyspin reply on April 20th, 2009 8:38 am:
I’m afraid I don’t know what might be causing the error. It’s obviously something to do with your environment but I can’t guess at what from here. Try posting the problem to the libcurl list or forums.
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Alon Diamant reply on June 23rd, 2009 1:53 am:
You forgot linking against the cURL .lib file.
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Mike - I got the same linker errors when trying to link against the static lib (curllib_static.lib). Switch to the dll (curllib.lib) and it should be ok. Although of course you will need to have curllib.dll on your path (along with any other dependencies like ssleay32.dll etc which you can get from the libcurl root folder).
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Doesn’t ‘exit()’ require the ‘process’ library?
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@mike
you need to set an additional library up in this case the libcurl.lib file that should come from the package you downloaded. Set the linker path to that and you should be good. Whenever I run it though, I get “program_name” is forced to close error and I’m stuck. I get no errors, not even warnings and I try to log in via a post request. Any idea you guys?
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Luckyspin reply on June 14th, 2009 5:27 pm:
Not entirely sure what would be causing that error. Have you tried stepping through your code in a debugger? Do you know exactly where it fails?
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thank you very much for this!! I’ve converted your code into a static class, making the code more portable.
It’s available on my site.
http://projectivemotion.com/?p=41
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