libcurl :显示正在运行的上传和下载速率

>我有一个使用libcurl实现file upload和file download的类。 代码如下。

内存结构

struct MemoryStruct {
uint8_t* memory;
size_t size;
};

回调函数

size_t handleData(void* contents, size_t size, size_t nmemb, void* stream) {
size_t realsize = size * nmemb;
struct MemoryStruct* mem = static_cast<struct MemoryStruct*>(stream);
uint8_t* ptr = static_cast<uint8_t*>(realloc(mem->memory, mem->size + realsize + 1));
if (ptr == NULL) {
return 0;
}
mem->memory = ptr;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}

下载功能

bool download(const std::string& url, std::string& md5sum) {
curl_off_t speed_download = 0;
CURLcode res;
struct MemoryStruct chunk{};
chunk.memory = static_cast<uint8_t*>(malloc(1));
if (nullptr == chunk.memory) {
m_logger->errorf("malloc failed: Not enough memory");
return false;
}
chunk.size = 0;
res = curl_easy_setopt(m_curl, CURLOPT_URL, url.c_str());
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt (CURLOPT_URL) failed: %s", curl_easy_strerror(res));
free(chunk.memory);
return false;
}
res = curl_easy_setopt(m_curl, CURLOPT_WRITEFUNCTION, handleData);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt (CURLOPT_WRITEFUNCTION) failed: %s", curl_easy_strerror(res));
free(chunk.memory);
return false;
}
res = curl_easy_setopt(m_curl, CURLOPT_WRITEDATA, (void*) &chunk);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt (CURLOPT_WRITEDATA) failed: %s", curl_easy_strerror(res));
free(chunk.memory);
return false;
}
res = curl_easy_perform(m_curl);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_perform() failed: %s", curl_easy_strerror(res));
free(chunk.memory);
return false;
}
std::vector<uint8_t> readData(chunk.memory, (chunk.memory + chunk.size));
md5sum = md5AsHex(readData);
res = curl_easy_getinfo(m_curl, CURLINFO_SPEED_DOWNLOAD, &speed_download);
if (CURLE_OK != res) {
m_logger->errorf("curl_easy_getinfo(CURLINFO_SPEED_DOWNLOAD) failed: %s", curl_easy_strerror(res));
free(chunk.memory);
return false;
}
m_logger->infof("Average download speed: %" CURL_FORMAT_CURL_OFF_T
"megabyte/sec.n", speed_download / (1024 * 1024));
free(chunk.memory);
return true;
}

上传功能

bool upload(const std::string& filename, const std::string& url) {
CURLcode res;
curl_off_t speed_upload = 0;
std::ifstream in(filename);
std::string data_contents((std::istreambuf_iterator<char>(in)), std::istreambuf_iterator<char>());
if (m_curl) {
res = curl_easy_setopt(m_curl, CURLOPT_URL, url.c_str());
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt(CURLOPT_URL) failed: %s", curl_easy_strerror(res));
return false;
}
res = curl_easy_setopt(m_curl, CURLOPT_POSTFIELDS, data_contents.c_str());
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt(CURLOPT_POSTFIELDS) failed: %s", curl_easy_strerror(res));
return false;
}
res = curl_easy_setopt(m_curl, CURLOPT_POSTFIELDSIZE, (long) strlen(data_contents.c_str()));
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt(CURLOPT_POSTFIELDSIZE) failed: %s", curl_easy_strerror(res));
return false;
}
res = curl_easy_setopt(m_curl, CURLOPT_VERBOSE, 1L);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_setopt(CURLOPT_VERBOSE) failed: %s", curl_easy_strerror(res));
return false;
}
res = curl_easy_perform(m_curl);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_perform() failed: %s", curl_easy_strerror(res));
return false;
}
res = curl_easy_getinfo(m_curl, CURLINFO_SPEED_UPLOAD, &speed_upload);
if (res != CURLE_OK) {
m_logger->errorf("curl_easy_getinfo(CURLINFO_SPEED_UPLOAD) failed: %s", curl_easy_strerror(res));
return false;
}
m_logger->infof("Average upload speed: %" CURL_FORMAT_CURL_OFF_T
" megabyte/sec.n", speed_upload / (1024 * 1024));
return true;
}
return false;
}

我想知道运行下载/上传速率，以便我可以在屏幕上显示它。在上面的例子中，我最后得到了upload和download率。我想计算正在运行的上传和下载速率并显示进度条之类的内容。我如何使用 libcurl 做到这一点。