想用C語言寫個采集程序，涉及到http相關的東西，找了找，有現成的libghttp庫。
libghttp庫的官方網址google一下第一條結果一般就是的：http://lfs.linuxsir.org/htdocs/blfscvs/gnome/libghttp.html

將源碼包下載下來，進入例行安裝流程：
1、解壓

# tar -xzvf libghttp-1.0.9.tar.gz
# cd libghttp-1.0.9

2、安裝

./configure
make
make install

安裝過種中小插曲：
在執行./configure命令的時候報錯：

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
 checking for ranlib... ranlib
checking for ld used by GCC... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD-compatible nm... /usr/bin/nm -B
checking whether ln -s works... yes
updating cache ./config.cache
ltconfig: you must specify a host type if you use `--no-verify'
Try `ltconfig --help' for more information.
configure: error: libtool configure failed

聽說在32位操作系統上一般不會有這樣的錯誤，在64位系統上比較常見，原因是軟件自身的config.guess和config.sub文件有問題，從系統中復制這兩個文件到軟件目錄覆蓋一下重新./configure就可以了(如果不知道這兩個文件在哪里，用find查找一下就OK了)：

# 首先查找一下config.guess和config.sub文件的目錄
find / -name config.guess
find / -name config.sub# 將查找出來的文件隨便選擇一個覆蓋到軟件目錄
cp /usr/share/automake-1.11/config.guess .
cp /usr/share/automake-1.11/config.sub .

下面是用libghttp搞了一個測試代碼，成功編譯和運行，證明libhttp安裝成功啦：

#include<libghttp.h>
#include<sthio.h>main()
{// This is the http request objectghttp_request *request = NULL;// Allocate a new empty request objectrequest = ghttp_request_new();// Set the URI for the request objectghttp_set_uri(request, "http://www.phpjiayuan.com/");// Close the connection after you are done.ghttp_set_header(request, http_hdr_Connection, "close");// Prepare the connectionghttp_prepare(request);// Process the requestghttp_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 reque
st. ghttp_request_destroy(request);
}

另一個網絡上的實例：
netutil.h

    /*  * File:   netutil.h * Author: Administrator * * Created on 2014年9月2日, 下午3:51 */  #ifndef NETUTIL_H  #define NETUTIL_H  #ifdef  __cplusplus  extern "C" {  #endif  int isFileExist(char * savePath);  int download(char *uri, char *savePath) ;  //result地址參數傳遞  int netGet(char* url, char* params, int timeout, char **result, int result_len) ;  int netPost(char* uri, char* params, int timeout, char **result, int result_len) ;  #ifdef  __cplusplus  }  #endif  #endif  /* NETUTIL_H */  

netutil.c

    #include "ghttp.h"  #include "http_hdrs.h"  #include <stdio.h>  #include <string.h>  #include <stdlib.h>  #include <io.h>  #include <unistd.h>  #define GET_ARRAY_LEN(array,len) {len = (sizeof(array) / sizeof(array[0]));}  int isFileExist(char * savePath) {  if (!access(savePath, F_OK)) {  return 1;  } else {  return 0;  }  }  //http://www.elesos.com/index.php?title=Libghttp庫使用指南  int download(char *uri, char *savePath) {  ghttp_request *request = NULL;  ghttp_status status;  FILE * pFile;  char *buf;  int bytes_read;  int size;  if(!isFileExist(savePath))  {  printf("savePath not exist ");  }  pFile = fopen(savePath, "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   //這里是錯誤的,當返回的數據為文本時,strlen的長度是正確,二進制數據如圖片/apk時的長度是錯誤的。  size = bytes_read; //size != bytes_read  printf("buf :%s \n size :%d \n" , buf,size);  fwrite(buf, 1, size, pFile);  fclose(pFile);  ghttp_clean(request);  ghttp_request_destroy(request);  return 0;  }  //result地址參數傳遞  int netGet(char* url, char* params, int timeout, char **result, int result_len) {  ghttp_request *request = NULL;  request = ghttp_request_new();  if(params!=NULL&&strlen(params)>0)  {  char tmp[1024];  strcpy(tmp,url);  if(strchr(tmp, '?') == NULL)//url不存在  {     strcat(tmp,"?")  ;            }  strcat(tmp,params) ;    printf("%s\n",tmp);  ghttp_set_uri(request, tmp);        }else{  ghttp_set_uri(request, url);  }   ghttp_set_type(request, ghttp_type_get); //get方法  ghttp_set_header(request, http_hdr_Connection, "close");  char timeout_str[10];  sprintf(timeout_str, "%d", timeout);  ghttp_set_header(request, http_hdr_Timeout, timeout_str);    ghttp_prepare(request);  ghttp_process(request);  *result = ghttp_get_body(request);  result_len = ghttp_get_body_len(request);  ghttp_request_destroy(request);  return 0;  }  int netPost(char* uri, char* params, int timeout, char **result, int result_len) {  char szVal[1024];  ghttp_request *request = NULL;  ghttp_status status;  int len;  printf("%s\n", params); //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");  char timeout_str[10];  sprintf(timeout_str, "%d", timeout);  ghttp_set_header(request, http_hdr_Timeout, timeout_str);  //ghttp_set_sync(request, ghttp_sync); //set sync  len = strlen(params);  ghttp_set_body(request, params, len); //  ghttp_prepare(request);  status = ghttp_process(request);  if (status == ghttp_error)  return -1;  *result = ghttp_get_body(request); //test  result_len=ghttp_get_body_len(request);  ghttp_clean(request);  return 0;  }  

main.c

    #include <stdlib.h>  #include "netutil.h"  int main(int argc, char *argv[]) {  char *result;  int len;  result=(char*)malloc(sizeof(char*)*8096);  memset(result, 0, sizeof(char*)*8096);  char param[2048]= "&lan=java&POSTDATA=15&f=ghttp";    netPost("http://127.0.0.1:8080/server/index.do",param, 5000, &result, len);  printf("%s\n%d\n", result, len);  netGet("http://127.0.0.1:8080/server/index.do?hehe=yy",param, 5000, &result, len);  printf("%s\n%d\n", result, len);  download("http://www.baidu.com/","test//fuck.html");  return 0;  }  

轉自：http://www.phpjiayuan.com/109/270.html
轉自:http://blog.csdn.net/earbao/article/details/39007549