C/C++ 程序在 Raspberry Pi 上无法正常工作

C/C++ program not correctly works on Raspberry Pi

本文关键字：常工作 工作 C++ 程序 Pi Raspberry      更新时间：2023-10-16


我编写了程序，通过我的gmail地址发送5封电子邮件，中间有1分钟的暂停。该程序适用于我的笔记本电脑，但不适用于树莓派。在树莓派上，它只发送 1 封电子邮件。

主.cpp：

#include <string>
#include <thread>
#include <chrono>
#include "email.c"
void threadFunction()
{
    for (int i = 0; i < 5; i++)
    {
        std::string message = /*"Hello my name is DmitryrnTest1rnTest2rn" + */std::to_string(i) + "rn";
        int status = sent_email("*********", "*********", "Test message", message.c_str(), "smtps://smtp.gmail.com", "*********", "*********");
        std::this_thread::sleep_for(std::chrono::minutes(1));
        status++;
    }
}
int main()
{
     /*std::thread thr(threadFunction);
     thr.join();*/
     threadFunction();
     return 0;
}

电子邮件：

#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
struct upload_information {
    const char *data;
    size_t data_length;
    size_t sent;
};
size_t read_callback(char *buffer, size_t size, size_t nitems, void *instream);
int sent_email(const char *FROM, const char *TO, const char *SUBJECT, const char *message, const char *server, const char *login, const char *password)
{
    CURL *curl;
    CURLcode res = CURLE_OK;
    struct curl_slist *recipients = NULL;
    size_t length = strlen(message) + strlen(FROM) + strlen(TO) + strlen(SUBJECT) + 32; //32 is FROM: <>/n/r, TO: <>/n/r length and SUBJECT + new line(after header - SMTP standart) + /0
    char *data;
    data = (char*)malloc(sizeof(char) * length);
    strcat(data, "FROM: <");
    strcat(data, FROM);
    strcat(data, ">rn");
    strcat(data, "TO: <");
    strcat(data, TO);
    strcat(data, ">rn");
    strcat(data, "SUBJECT: ");
    strcat(data, SUBJECT);
    strcat(data, "rnrn");
    strcat(data, message);
    struct upload_information upload_info;
    upload_info.data = data;
    upload_info.data_length = length;
    upload_info.sent = 0;
    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_USERNAME, login);
        curl_easy_setopt(curl, CURLOPT_PASSWORD, password);
        curl_easy_setopt(curl, CURLOPT_URL, server);
        curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
        recipients = curl_slist_append(recipients, TO);
        //recipients = curl_slist_append(recipients, CC);
        curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
        curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
        curl_easy_setopt(curl, CURLOPT_READDATA, &upload_info);
        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
        //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        res = curl_easy_perform(curl);
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %sn", curl_easy_strerror(res));
        curl_slist_free_all(recipients);
        curl_easy_cleanup(curl);
    }
    free(data);
    return (int)res;
}
size_t read_callback(char *buffer, size_t size, size_t nitems, void *instream)
{
    struct upload_information *upload_info = (struct upload_information *)instream;
    if ((size == 0) || (nitems == 0) || (size * nitems < 1))
        return 0;
    if (upload_info->sent < upload_info->data_length)
    {
        size_t length = size * nitems;
        if (length > upload_info->data_length - upload_info->sent)
            length = upload_info->data_length - upload_info->sent;
        memcpy(buffer, upload_info->data + upload_info->sent, length);
        upload_info->sent += length;
        return length;
    }
    return 0;
}

树莓派上的错误消息：
*** glibc detected *** ./Mailer: double free or corruption (!prev): 0x01d0da38 ***

附言树莓派上的程序发送 1 条正确消息和第二条消息的一部分。
PSS帖子已更新

您为消息分配的缓冲区为 1 个字节到短。要添加的所有常量字符串的总长度为 29，但您还需要为strcat终止字符串的''字符再添加一个字节。

如果运行以下代码，则会显示所有字符串文本的串联长度30：

#include <stdio.h>
int
main() {
    printf("%dn", (int) sizeof("FROM: <" ">rn"
                                "TO: <" ">rn"
                                "SUBJECT: " "rn"));
}

该消息还有另外两个问题。一是您没有根据需要在标头和邮件之间放置一个空行。另一个是您没有用 rn 终止消息的最后一行。这可能会混淆 curl 库，因为它需要添加行尾终止符本身。否则，邮件将无法通过 SMTP 正确发送。

我已经解决了我的问题。问题是因为我释放内存时我没有重置内存。

我添加*data = ''; befor strcat。

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