C++ libcurl 上传进度条

Question

很简单：我们正在使用 libcurl 简易界面将大量文件上传到在线数据存储。我需要显示此上传的进度。我知道所有文件信息，所以基本上我必须找出发送了多少 bits/bytes 并计算整个文件的百分比。

我翻阅了libcurl手册，但没有找到任何关于上传进度的信息，只有下载进度。

我是 libcurl 的新手，正在使用同事的函数。所以我可能漏掉了什么。

有没有使用libcurl监控上传进度的方法？

Answer 1

For historical and traditional reasons, libcurl has a built-in progress meter that can be switched on and then makes it present a progress meter in your terminal.

Switch on the progress meter by, oddly enough, setting CURLOPT_NOPROGRESS to zero. This option is set to 1 by default.

For most applications however, the built-in progress meter is useless and what instead is interesting is the ability to specify a progress callback. The function pointer you pass to libcurl will then be called on irregular intervals with information about the current transfer.

Set the progress callback by using CURLOPT_PROGRESSFUNCTION. And pass a pointer to a function that matches this prototype:

  int progress_callback(void *clientp,
                        double dltotal,
                        double dlnow,
                        double ultotal,
                        double ulnow);

If any of the input arguments is unknown, a 0 will be passed. The first argument, the 'clientp' is the pointer you pass to libcurl with CURLOPT_PROGRESSDATA. libcurl won't touch it.

C++ libcurl 上传进度条

C++ libcurl upload progress bar

c++

upload

libcurl

progress-bar