Libghttp库使用指南

ibghttp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：艺搜下载

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 type if you use `--no-verify'
Try `ltconfig --help' for more 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

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/local
make
sudo make install

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)//get
return -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_read
fwrite (buf , 1 ,size , pFile );
fclose(pFile);
return 0;
}

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)		//post
return -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);	//test
sprintf(retbuf, "%s", buf);
ghttp_clean(request);
return 0;
}

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