思路是先用curl抓取網頁源碼，然後以關鍵字尋找出圖片網址。 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <curl/curl.h> void get_key_from_str(char *origin, c ...
思路是先用curl抓取網頁源碼，然後以關鍵字尋找出圖片網址。 #include <stdio.h> #include <stdlib.h> #include <string.h> #include <curl/curl.h> void get_key_from_str(char *origin, char *str1, char *str2, char *key); int main(int argc, char **argv) { CURL *curl; FILE *fp = NULL, *fp_read = NULL; int file_size = 0; char *tmp = NULL; int flag = 0; char key[1024] = {0}; char str1[128] = {0}; char str2[128] = {0}; if ((fp = fopen("test.txt", "w")) == NULL) { return 1; } curl = curl_easy_init(); if (curl) { flag = 1; curl_easy_setopt(curl, CURLOPT_URL, argv[1]); //curl設置網址 curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //將網頁源碼存在文件中，好像只能存文件，不能存字元串 curl_easy_perform(curl);//開始抓取 curl_easy_cleanup(curl); fclose(fp); fp_read = fopen("test.txt", "rb"); fseek(fp_read, 0, SEEK_END); //把指針移到文本最後 file_size = ftell(fp_read) ;//算出文本大小 fseek(fp_read, 0, SEEK_SET); //再把指針移到最前面 tmp = (char *)malloc(file_size * sizeof(char)); //malloc一段記憶體 printf("file_size:%d\n", file_size); fread(tmp, file_size, sizeof(char), fp_read); //讀取文件 fclose(fp_read); snprintf(str1, sizeof(str1), "img src=\""); snprintf(str2, sizeof(str2), "\""); get_key_from_str(tmp, str1, str2, key); //取得網址 printf("key:%s\n", key); free(tmp); } if (!flag) { fclose(fp); } return 0; } //抓取str1和str2之間的關鍵字 void get_key_from_str(char *origin, char *str1, char *str2, char *key) { char *p = strstr(origin, str1); char *q = strstr(p + strlen(str1), str2); int len = q - p - strlen(str1); snprintf(key, len + 1, "%s", p + strlen(str1)); key[len + 1] = '\0'; } gcc -g -Wall main.c -o test -lcurl ./test url 即可
