在C ++中通過CURL上傳文件時，curl_easy_perform（）崩潰

Question

通過C ++中的curl庫上傳文件時出現崩潰問題。 我正在從以下位置使用確切的演示代碼： https : //curl.haxx.se/libcurl/c/fileupload.html

我在代碼中唯一更改的是上載位置（要上載到Windows上的本地wamp服務器）和要上載的文件，我已經證實它可以打開。

我正在運行Visual Studio 2014，並通過DLL構建CURL

該程序的輸出為：

*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)
> PUT /replayupload.php HTTP/1.1
Host: 127.0.0.1
Accept: */*
Content-Length: 43
Expect: 100-continue

< HTTP/1.1 100 Continue

*然后我在程序的第66行崩潰了。 看來這行：

 res = curl_easy_perform(curl);

導致參數無效的問題。 我已經驗證了curl變量不為null，但是我發現很難獲得比此更多的調試信息，調用堆棧僅引用DLL中的內存地址。

我可以運行該演示程序，以僅上傳帖子變量並獲取頁面，這可以正常運行而不會崩潰。 僅在上傳文件時發生崩潰。

我的確切代碼是：

int main(void)
{
    CURL *curl;
    CURLcode res;
    struct stat file_info;
    double speed_upload, total_time;
    FILE *fd;

    fd = fopen("E:\\testfiles\\test.txt", "rb"); /* open file to upload */
    if (!fd)
        return 1; /* can't continue */

              /* to get the file size */
    if (fstat(_fileno(fd), &file_info) != 0)
        return 1; /* can't continue */

    curl = curl_easy_init();
    if (curl) {
        /* upload to this place */
        curl_easy_setopt(curl, CURLOPT_URL,
            "http://127.0.0.1/testupload.php");

        /* tell it to "upload" to the URL */
        curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

        /* set where to read from (on Windows you need to use READFUNCTION too) */
        curl_easy_setopt(curl, CURLOPT_READDATA, fd);

        /* and give the size of the upload (optional) */
        curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
            (curl_off_t)file_info.st_size);

        /* enable verbose for easier tracing */
        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

        res = curl_easy_perform(curl);
        /* Check for errors */
        if (res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                curl_easy_strerror(res));

        }
        else {
            /* now extract transfer info */
            curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed_upload);
            curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &total_time);

           fprintf(stderr, "Speed: %.3f bytes/sec during %.3f seconds\n",
                speed_upload, total_time);

        }
        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    fclose(fd);
    return 0;
}

Answer 1

感謝Tkausl發現了這條線

/* set where to read from (on Windows you need to use READFUNCTION too) */

我將此行添加到我的代碼中

curl_easy_setopt(curl, CURLOPT_READFUNCTION, &fread);

現在一切似乎都正常了。