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关于 LIBGHTTP 收集的资料

龚勇锐
2023-12-01




源码在这里:
http://libghttp.sourcearchive.com/documentation/1.0.9-17/files.html
注意一个问题:
用函数获 ghttp_get_body_len()  取长度时,如果要得到的包长度比较长话, 有可能对端服务器没有flush,把缓冲区的内容输出, 导致长度始终是一个定值。
 
例子
A simple example
Here's a simple example to get you started. This snippit of code shows how you can go out and get a file off of an HTTP server. Please note that this code contains no error checking at all.




// 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);
 
 
 


simple-get.c
 
#include <stdio.h>
#include <ghttp.h>
#include <unistd.h>


void bail(char *s)
{
      fputs(s, stderr); fputc('\n', stderr);
      exit(1);
}
void status(ghttp_request *r, char *desc)
{
      ghttp_current_status st;
      st = ghttp_get_status(r);
      fprintf(stderr, "%s: %s [%d/%d]\n",
                  desc,
                  st.proc == ghttp_proc_request ? "request" :
                  st.proc == ghttp_proc_response_hdrs ? "response-headers" :
                  st.proc == ghttp_proc_response ? "response" : "none",
                  st.bytes_read, st.bytes_total);
}
int main(int argc, char **argv)
{
      int bytes = 0;
      ghttp_request *req;
      ghttp_status req_status;
      if (argc < 2) bail("usage: simple-get URI");
      req = ghttp_request_new();
      if (ghttp_set_uri(req,argv[1]) < 0)
            bail("ghttp_set_uri");
      if (ghttp_prepare(req) < 0)
            bail("ghttp_prepare");
      if (ghttp_set_sync(req, ghttp_async) < 0)
            bail("ghttp_set_sync");
      do {
            status(req, "conn0");
            req_status = ghttp_process(req);
            if (req_status == ghttp_error) {
                  fprintf(stderr, "ghttp err: %s\n",
                              ghttp_get_error(req));
                  return 2;
            }
            if (req_status != ghttp_error && ghttp_get_body_len(req) > 0) {
                  bytes += ghttp_get_body_len(req);
                  ghttp_flush_response_buffer(req);
            }
      } while (req_status == ghttp_not_done);
      fprintf(stderr, "conn0 received %d bytes\n", bytes);
      ghttp_clean(req);
      return 0;
}






转自 http://blog.sina.com.cn/s/blog_498a6eeb0100s186.html








前些时间,由于找不到一个比较好使用的http库,自己封装了一个,不过时间紧迫,也没有完整分析HTTP协议,因此心里总不塌实地使用它,一次偶然的机会,让我在网上找到一个好用的http库 -- libghttp,目前的版本因该是libghttp-1.0.9.


这个库十分的方便使用,它能够轻松地实现同步和异步的Http请求。


简单使用实例:


#include <ghttp.h>
int main(int argc, char *argv[])
{
    char *uri = "http://www.hao123.com";
    ghttp_request *request = NULL;
    ghttp_status status;
    char *buf;
    int bytes_read;
    
    request = ghttp_request_new();
    if(ghttp_set_uri(request, uri) == -1)
        exit(-1);
    if(ghttp_set_type(request, ghttp_type_get) == -1)
        exit(-1);
    ghttp_prepare(request);
    status = ghttp_process(request);
    if(status == ghttp_error)
        exit(-1);
    /* OK, done */
    printf("Status code -> %d/n", ghttp_status_code(request));
    buf = ghttp_get_body(loader->request);
    bytes_read = ghttp_get_body_len(loader->request);
    return 0;
}


异步请求实例:
#include <ghttp.h>
int main(int argc, char *argv[])
{
    char *uri = "http://www.hao123.com";
    ghttp_request *request = NULL;
    ghttp_status status;
    char *buf;
    int bytes_read;
    
    request = ghttp_request_new();
    if(ghttp_set_uri(request, uri) == -1)
        exit(-1);
    if(ghttp_set_type(request, ghttp_type_get) == -1)
        exit(-1);
    /* NOTE: Set async request */
    ghttp_set_sync(request, ghttp_async);
    ghttp_prepare(request);
    
    while(1) {
        status = ghttp_process(request);
        if(status == ghttp_error)
            break;
        /* NOTE: buf may NULL, notice it */
        buf = ghttp_get_body(loader->request);
        bytes_read = ghttp_get_body_len(loader->request);
        if(status == ghttp_done) {
            /* NOTE: Ok, done */
            break;
        }
    }
    return 0;
}






 libcurl note(Http应用)
 
 设置Callback function处理Http头,返回内容,进度
CURLOPT_WRITEFUNCTION
CURLOPT_WRITEDATA


CURLOPT_HEADERFUNCTION
CURLOPT_HEADERDATA


CURLOPT_NOPROGRESS
CURLOPT_PROGRESSFUNCTION
CURLOPT_PROGRESSDATA


设置连接等待时间,传输等待时间:
CURLOPT_TIMEOUT:
CURLOPT_CONNECTIONTIMEOUT:


设置重定位URL:
CURLOPT_FOLLOWLOCATION


实现断点续传:
CURLOPT_RANGE: 
CURLOPT_RESUME_FROM:
注: 在我的测试中 这两个参数无效。 设置RANGE后 下载全部数据,而不是后续数据;设置RESUME_FROM后,程序无响应。




Http头设置:
Range: bytes=xx-       [可以用来实现断点续传]
User-Agent: xx
Location:              [网页重定位 url]
Set-Cookie:            [Cookie]
Content-Length:        [报文长度]
Content-Type:            [报文类型]




例程:


test()
{
        CURL *curl;
        CURLcode res;
        struct curl_slist *slist_header = NULL;
                                                                                
        FILE *pFile_error = fopen(CURL_ERROR_FILE, "w+");
                                                                                
        curl = curl_easy_init();
        if(curl)
        {
                slist_header = curl_slist_append(slist_header, version_id.data());
                curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist_header);
                                                                                
                QString follow_location=QString("With follow location");
                curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, follow_location.data());
                curl_easy_setopt(curl, CURLOPT_TIMEOUT, timeout);
                curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, timeout_connect); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
                curl_easy_setopt(curl, CURLOPT_NOPROGRESS, false);
                curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &progress_percent) ;               
                curl_easy_setopt(curl, CURLOPT_WRITEDATA, &recv_buf);
                curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback); curl_easy_setopt(curl, CURLOPT_HEADERDATA, &header_buf);
                curl_easy_setopt(curl, CURLOPT_POST, TRUE);
                curl_easy_setopt(curl, CURLOPT_POSTFIELDS,zip_buf);
                curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE,zip_len);
                curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
                curl_easy_setopt(curl, CURLOPT_STDERR, pFile_error);
                int res = curl_easy_perform(curl);
                if (res == 0) {
                        .......
                }
                curl_easy_cleanup(curl);
                curl_slist_free_all(slist_header);
                fflush(pFile_error);
                fclose(pFile_error);
        }
}
 
 
CURLOPT_RESUME_FROM参数实验有效的。我使用的时候,他当前文件的大小作为参数一起传递进去,他会传递后续数据。
 
 
 转自 http://blog.csdn.net/yjfkpyu/article/details/3955186
 
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