c libghttp ghttp 库使用指南

libghttp是一个很好用的 http 库，能够轻松地实现同步和异步的HTTP请求

目录  [ 隐藏]  1 安装 2 GET示例 3 POST示例 4 相关函数 5 艺搜参考

安装

库文件下载：

在64位机器下configure时出现错误信息:

...
checking host system type... Invalid configuration `x86_64-unknown-linux-gnu': machine `x86_64-unknown' not recognized
checking build system type... Invalid configuration `x86_64-unknown-linux-gnu': machine `x86_64-unknown' not recognized
...
ltconfig: you must specify a host typeif you use `--no-verify'
Try `ltconfig --help'formore information.
configure: error: libtool configure failed
...

即configure无法识别系统的类型, 所以提示you must specify a host type.

解决方法：

用 /usr/share/libtool/config/config.guess 覆盖源码包中的config.guess

tar -zxvf libghttp-1.0.9.tar.gz 

cd libghttp-1.0.9

cp/usr/share/libtool/config/config.guess  ./config.guess

用 /usr/share/libtool/config/config.sub 覆盖源码包中的 config.sub

cp/usr/share/libtool/config/config.sub  ./config.sub

这样configure就可以猜出系统的类型了.

开始安装：

./configure --prefix=/usr/localmakesudomakeinstall

GET示例

/*
 * libghttp_get.c
 *  http get test
 *  Created on: 2013年10月25日
 *      Author: elesos.com
 */
 
#include <stdio.h>#include <string.h>#include <ghttp.h>int main(int argc,char**argv){char*uri ="http://www.elesos.com/%E9%A6%96%E9%A1%B5";
    ghttp_request *request = NULL;
    ghttp_status status;
    FILE * pFile;char*buf;int bytes_read;int size;
 
    pFile =fopen("elesos.html","wb");
 
    request = ghttp_request_new();if(ghttp_set_uri(request, uri)==-1)return-1;if(ghttp_set_type(request, ghttp_type_get)==-1)//getreturn-1;
    ghttp_prepare(request);
    status = ghttp_process(request);if(status == ghttp_error)return-1;printf("Status code -> %d\n", ghttp_status_code(request));
    buf = ghttp_get_body(request);
 
    bytes_read = ghttp_get_body_len(request);
    size =strlen(buf);//size == bytes_readfwrite(buf ,1,size , pFile );fclose(pFile);return0;}

POST示例

int post_test(){char szXML[2048];char szVal[256];
 
	ghttp_request *request = NULL;
	ghttp_status status;char*buf;char retbuf[128];int len;
 
	strcpy(szXML,"POSTDATA=");sprintf(szVal,"%d",15);strcat(szXML, szVal);
 
	printf("%s\n", szXML);//test
 
	request = ghttp_request_new();if(ghttp_set_uri(request, uri)==-1)return-1;if(ghttp_set_type(request, ghttp_type_post)==-1)//postreturn-1;
 
	ghttp_set_header(request, http_hdr_Content_Type,"application/x-www-form-urlencoded");//ghttp_set_sync(request, ghttp_sync); //set sync
	len =strlen(szXML);
	ghttp_set_body(request, szXML, len);//
	ghttp_prepare(request);
	status = ghttp_process(request);if(status == ghttp_error)return-1;
	buf = ghttp_get_body(request);//testsprintf(retbuf,"%s", buf);
	ghttp_clean(request);return0;}

源代码打包下载：艺搜下载

一般在do{}while(1)中，选择使用同步的方式；

如果是set(callback)的方式，这时可以使用异步的方式。如果是异步的方式，一般涉及到对接收包的排序问题。参见同步和异步的区别

相关函数

ghttp_set_sync(request, ghttp_sync);//设置同步// This is the http request object
ghttp_request *request = NULL;// Allocate a new empty request object
request = ghttp_request_new();// Set the URI for the request object
ghttp_set_uri(request,"http://localhost:8080/index.html");// Close the connection after you are done.
ghttp_set_header(request, http_hdr_Connection,"close");//Prepare the connection
ghttp_prepare(request);// Process the request
ghttp_process(request);// Write out the body. Note that the body of the request may not be null terminated so we have to be careful of the length.fwrite(ghttp_get_body(request), ghttp_get_body_len(request),1, stdout);//Destroy the request. This closes any file descriptors that may be open and will free any memory associated with the request.
ghttp_request_destroy(request);

艺搜参考

http://lfs.linuxsir.org/htdocs/blfscvs/gnome/libghttp.html

http://oss.org.cn/ossdocs/gnu_linux/lfs/blfs-1.0/gnome/libghttp.html