c++ - curl_easy_setopt(curl, CURLOPT_POSTFIELDS, msg_out);重复内存？

Question

我用了很多次

curl_easy_setopt(curl, CURLOPT_POSTFIELDS, msg_out); 

在我使用 curl_easy_cleanup() 函数清理之前的代码中。

CURL 是否在其环境中制作了 msg_out 的内存拷贝(动态内存)？

Answer 1

不，它默认不复制，这在 CURLOPT_POSTFIELDS documentation 中有说明:

The data pointed to is NOT copied by the library: as a consequence, it must be preserved by the calling application until the associated transfer finishes. This behaviour can be changed (so libcurl does copy the data) by setting the CURLOPT_COPYPOSTFIELDS option.