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libcurl8.9.1 上传mp4文件

news 来源：原创 2024/9/19 8:57:19

在postman 中使用POST----》body----》form-data

使用libcurl提交代码方式：

结构体：

#define MAX_ARRAY_SIZE      5*1024*1024struct SMART_DATA_CACHE
{char* buf;long dwTotalLen;SMART_DATA_CACHE(){dwTotalLen = 0;buf = nullptr;while (!buf) {try {buf = new char[MAX_ARRAY_SIZE];}catch (...) {}}memset(buf, 0x00, MAX_ARRAY_SIZE);}~SMART_DATA_CACHE(){if (buf) {delete[] buf;buf = nullptr;dwTotalLen = 0;}}
};

接收回调：

size_t ManageCurl::http_recv_cb(void* ptr, size_t size, size_t nmemb, void* stream)
{SMART_DATA_CACHE* pDataBuf = (SMART_DATA_CACHE*)stream;if (pDataBuf) {if (pDataBuf->buf) {if (pDataBuf->dwTotalLen + size * nmemb < MAX_ARRAY_SIZE) {memcpy(pDataBuf->buf + pDataBuf->dwTotalLen, ptr, size * nmemb);pDataBuf->dwTotalLen += size * nmemb;}}}return size * nmemb;
}

调用：

CURL* curl = curl_easy_init();
if (curl) {struct curl_slist* http_header = NULL;/* 填充文件上传字段 */curl_mime* form = curl_mime_init(curl);curl_mimepart* field = curl_mime_addpart(form);curl_mime_name(field, "file");curl_mime_filedata(field, "d:\\2024_08_13_11_14_17.991.mp4");//http_header = curl_slist_append(http_header, "Expect:");//http_header = curl_slist_append(http_header, "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3");http_header = curl_slist_append(http_header, "Charset: UTF-8");http_header = curl_slist_append(http_header, "Connection: keep-alive");//保持长连接http_header = curl_slist_append(http_header, "Content-Type:multipart/form-data");//保持长连接curl_easy_setopt(curl, CURLOPT_HTTPHEADER, http_header);//修改协议头curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, http_recv_cb);//设置接收回调curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)&stRecv);//设置设置参数curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 10);//设置连接时的超时时间为5秒curl_easy_setopt(curl, CURLOPT_TIMEOUT, nTimeout);//超时秒为单位curl_easy_setopt(curl, CURLOPT_URL, pUrl);//指定URLcurl_easy_setopt(curl, CURLOPT_MIMEPOST, form);curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);CURLcode res = curl_easy_perform(curl);//执行long nRet = 0;CURLcode codeRet = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &nRet);if (codeRet == CURLE_OK && nRet == 200) {bResult = true;}curl_easy_cleanup(curl);curl_mime_free(form);curl_slist_free_all(http_header);
}

这里需要注意：

1. Content-Type为 multipart/form-data

2.curl_easy_setopt(curl, CURLOPT_POST, 1L); 不需要指定，所以不需要添加该语句

3.下面这段代码上传不行

curl_easy_setopt(curl, CURLOPT_READFUNCTION, http_read_cb);
curl_easy_setopt(curl, CURLOPT_READDATA, pFile);
curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)stFileInfo.st_size);

4. 下面这句代码也不行

curl_formadd((curl_httppost**)&formpost,
               (curl_httppost**)&lastptr,
               CURLFORM_COPYNAME, "File1",
               CURLFORM_FILE, "d://进步.txt",
               CURLFORM_FILENAME, pUrlName,
               CURLFORM_END);