Question

I just finished my struggle with libcurl and finally when everything compiled just great I got an error when sending an email. I copied the code from an example and just changed to my server port/login/password.

Here’s the error screenshot:

!http://wstaw.org/m/2011/08/22/error.png

And here’s the code I’m using: http://pastebin.com/3BTA1fUW

EDIT: CODE + CALLSTACK: http://pastebin.com/DijJnYH0

Answer 1

Your payload_source function is ignoring the size and nmemb parameters passed in.

curl prepares a small buffer for you to write data into – the size of this buffer is given by size * nmemb. You cannot insert any more than size * nmemb bytes; you have to wait for the next call. So if your strlen(data) turns out something longer than size * nmemb, you write too much data and corrupt the heap. This can result in the crash you have shown.

If fixing this does not fix your problem, please provide the rest of your code, and a copy of the stack trace.