linux C 代码实现多线程拉取imap服务器所有的邮件到本地目录
时间: 2024-02-09 11:08:30 浏览: 39
以下是一个简单的 Linux C 代码示例,用于使用多线程方式从 IMAP 服务器中拉取所有邮件到本地目录:
```c
#include <pthread.h>
#include <curl/curl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_THREADS 10
#define MAX_MAIL_SIZE 1024
typedef struct {
char *url;
char *userpwd;
char *mail_dir;
} thread_arg_t;
size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata) {
FILE *fp = (FILE *)userdata;
size_t written = fwrite(ptr, size, nmemb, fp);
return written;
}
void *thread_download_mail(void *arg) {
thread_arg_t *t_arg = (thread_arg_t *)arg;
char mail_url[MAX_MAIL_SIZE];
CURL *curl;
CURLcode res;
FILE *fp;
int ret;
curl = curl_easy_init();
if (!curl) {
fprintf(stderr, "curl_easy_init() failed.\n");
return NULL;
}
snprintf(mail_url, MAX_MAIL_SIZE, "%s/mailbox", t_arg->url);
curl_easy_setopt(curl, CURLOPT_URL, mail_url);
curl_easy_setopt(curl, CURLOPT_USERPWD, t_arg->userpwd);
char mail_file[MAX_MAIL_SIZE];
snprintf(mail_file, MAX_MAIL_SIZE, "%s/mailbox_%ld", t_arg->mail_dir, pthread_self());
fp = fopen(mail_file, "wb");
if (!fp) {
fprintf(stderr, "fopen() failed.\n");
curl_easy_cleanup(curl);
return NULL;
}
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
res = curl_easy_perform(curl);
if (res != CURLE_OK) {
fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
}
fclose(fp);
curl_easy_cleanup(curl);
}
int main(int argc, char **argv) {
if (argc < 5) {
printf("Usage: %s <imap_server_url> <username:password> <mail_dir> <num_threads>\n", argv[0]);
return 1;
}
char *url = argv[1];
char *userpwd = argv[2];
char *mail_dir = argv[3];
int num_threads = atoi(argv[4]);
pthread_t threads[num_threads];
thread_arg_t t_args[num_threads];
int i;
for (i = 0; i < num_threads; i++) {
t_args[i].url = url;
t_args[i].userpwd = userpwd;
t_args[i].mail_dir = mail_dir;
pthread_create(&threads[i], NULL, thread_download_mail, &t_args[i]);
}
for (i = 0; i < num_threads; i++) {
pthread_join(threads[i], NULL);
}
return 0;
}
```
以上代码使用了 libcurl 库来进行网络请求,并且使用了 pthread 库来进行多线程处理。该程序将从 IMAP 服务器的 `/mailbox` 路径下拉取所有邮件,并将邮件内容保存到以线程 ID 命名的文件中。程序使用了命令行参数来接收 IMAP 服务器 URL、用户名和密码、保存邮件的本地目录以及线程数。