C语言发送post请求数据程序（c语言postmessage用法）

C语言发post请求数据程序， 工作需要，网上查资料N篇，作为半路出家学编程的，走过了N个坑，终于完成以下的测试程序。

使用了curl的库, 这样无论在windows或者在linux都可以使用.

win下的编程环境是TDM-GCC-64, 怎样安装，也是另一个话题。需要这个的请自行上网查询怎样安装.

linux 下是gcc环境，最好先安装curl开发包，目的就是需要curl.h等文件, 怎样安装，也是另一个话题。

废话不说，以下是正式程序.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <curl/curl.h>

struct string {

char *ptr;

size_t len;

};

void init_string(struct string *s) {

s->len = 0;

s->ptr = malloc(s->len + 1);

if (s->ptr == NULL) {

fprintf(stderr, "malloc() failed\n");

exit(EXIT_FAILURE);

}

s->ptr[0] = '\0';

}

size_t writefunc(void *ptr, size_t size, size_t nmemb, struct string *s)

{

size_t new_len = s->len + size * nmemb;

s->ptr = realloc(s->ptr, new_len + 1);

if (s->ptr == NULL) {

fprintf(stderr, "realloc() failed\n");

exit(EXIT_FAILURE);

}

memcpy(s->ptr + s->len, ptr, size*nmemb);

s->ptr[new_len] = '\0';

s->len = new_len;

return size * nmemb;

}

CURLcode curl_post_req(char *url, char *postParams,struct curl_slist *headers, char *response)

{

CURL *curl;

curl = curl_easy_init(); //初始化

// curl返回值

CURLcode res;

if (curl)

{

struct string s;

init_string(&s);

curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);

//curl_easy_setopt(curl, CURLOPT_URL, "http://httpbin.org/post");

curl_easy_setopt(curl, CURLOPT_URL, url);

curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunc);

curl_easy_setopt(curl, CURLOPT_WRITEDATA, &s);

curl_easy_setopt(curl, CURLOPT_POST, 1);//设置CURLOPT_POST之后必须带有POST数据

curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postParams);

//不接收响应头数据0代表不接收 1代表接收

curl_easy_setopt(curl, CURLOPT_HEADER, 0);

curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

//CURLOPT_VERBOSE的值为1时，会显示详细的调试信息

curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);

curl_easy_setopt(curl, CURLOPT_READFUNCTION, NULL);

curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);

//设置超时时间，以秒来计算 CURLOPT_CONNECTTIMEOUT是连接超时

curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);

curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10);

// https ssl 时需要用到，如果是 http 可以注释掉

curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);

curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

res = curl_easy_perform(curl);

//printf(" =>%s=>=>\n", s.ptr);

sprintf(response," =>%s\n", s.ptr);

free(s.ptr);

curl_slist_free_all(headers);

};

curl_easy_cleanup(curl);

return res;

}

int main(int argc, const char *argv[])

{

// http 请求头, 构造

printf(" start...\n");

struct curl_slist *headers1 = NULL;

headers1 = curl_slist_append(headers1, "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko");

headers1 = curl_slist_append(headers1, "Content-Type:application/x-www-form-urlencoded; charset=UTF-8");

char url_post0[100] = "https://www.lpfrx.com/";

// 查找的字符串 ： delphi

char paramsLogin0[100] = "s=delphi";

char resPost0[40960] = "";

CURLcode res3 = curl_post_req(url_post0, paramsLogin0, headers1,resPost0);

if (res3 == CURLE_OK)

{

printf("data: %s" ,resPost0);

}

printf(" end...\n");

return 0;

}

// win 下cmd下运行乱码，请先执行 chcp 65001 转成 utf8. 默认是chcp 936

// win: 运行目录下需要zlib.dll libcurl.dll

// curl-Library 是我自己的目录，放在当前的程序目录下，win下的curl.h 也是需要自己去找，如果有python编程环境的话，也安装了curl库的话，应该可能会有curl.h的库路径

// win: gcc -o curlpostlpfrx curlpost_lpfrx.c -I ./curl-Library/include -L ./curl-Library/lib -lcurl

//linux: gcc -o curlpostlpfrx curlpost_lpfrx.c -lcurl