思路是先用curl抓取网页源码，然后以关键字寻找出图片网址。
范例：
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include <string.h> 4 #include <curl/curl.h> 5 6 void get_key_from_str(char *origin, char *str1, char *str2, char *key); 7 8 int main(int argc, char **argv) 9 { 10 CURL *curl; 11 FILE *fp = NULL, *fp_read = NULL; 12 int file_size = 0; 13 char *tmp = NULL; 14 int flag = 0; 15 char key[1024] = {0}; 16 char str1[128] = {0}; 17 char str2[128] = {0}; 18 19 if ((fp = fopen("test.txt", "w")) == NULL) 20 { 21 return 1; 22 } 23 curl = curl_easy_init(); 24 if (curl) 25 { 26 flag = 1; 27 curl_easy_setopt(curl, CURLOPT_URL, argv[1]); //curl设置网址 28 curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //将网页源码存在文件中，好像只能存文件，不能存字符串 29 curl_easy_perform(curl);//开始抓取 30 curl_easy_cleanup(curl); 31 fclose(fp); 32 fp_read = fopen("test.txt", "rb"); 33 fseek(fp_read, 0, SEEK_END); //把指针移到文本最后 34 file_size = ftell(fp_read) ;//算出文本大小 35 fseek(fp_read, 0, SEEK_SET); //再把指针移到最前面 36 tmp = (char *)malloc(file_size * sizeof(char)); //malloc一段内存 37 printf("file_size:%d ", file_size); 38 fread(tmp, file_size, sizeof(char), fp_read); //读取文件 39 fclose(fp_read); 40 snprintf(str1, sizeof(str1), "img src=""); 41 snprintf(str2, sizeof(str2), """); 42 get_key_from_str(tmp, str1, str2, key); //取得网址 43 44 printf("key:%s ", key); 45 free(tmp); 46 } 47 48 if (!flag) 49 { 50 fclose(fp); 51 } 52 53 return 0; 54 } 55 //抓取str1和str2之间的关键字 56 void get_key_from_str(char *origin, char *str1, char *str2, char *key) 57 { 58 char *p = strstr(origin, str1); 59 char *q = strstr(p + strlen(str1), str2); 60 int len = q - p - strlen(str1); 61 snprintf(key, len + 1, "%s", p + strlen(str1)); 62 key[len + 1] = ' '; 63 }
gcc -g -Wall main.c -o test -lcurl
./test url