爬虫源码是一种用于自动获取网页内容的程序代码。通过分析网页结构，提取所需信息并保存或处理。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp) {
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)userp;
char *ptr = realloc(mem>memory, mem>size + realsize + 1);
if (ptr == NULL) {
printf("not enough memory (realloc returned NULL)
");
return 0;
}
mem>memory = ptr;
memcpy(&(mem>memory[mem>size]), contents, realsize);
mem>size += realsize;
mem>memory[mem>size] = 0;
return realsize;
}
int main(void) {
CURL *curl_handle;
CURLcode res;
struct MemoryStruct chunk;
chunk.memory = malloc(1);
chunk.size = 0;
curl_global_init(CURL_GLOBAL_ALL);
curl_handle = curl_easy_init();
if (curl_handle) {
curl_easy_setopt(curl_handle, CURLOPT_URL, "http://example.com");
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurlagent/1.0");
res = curl_easy_perform(curl_handle);
if (res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s
", curl_easy_strerror(res));
} else {
printf("%lu bytes retrieved
", (unsigned long)chunk.size);
printf("Content:
%s
", chunk.memory);
}
curl_easy_cleanup(curl_handle);
free(chunk.memory);
}
curl_global_cleanup();
return 0;
}
这个示例程序会抓取"http://example.com"的HTML内容并打印出来，你可以根据需要修改URL和处理逻辑。
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