program close unexpectedly after adding QHttpMultiPart in my software

[Mohammadhzp]

Hello
I'm newbie,so sorry if my question is simple
I had some problem for uploading file through HTTP,finally I got the solution,here is a working example
then I just change my code to work with QHttpMultiPart,when I was done,I run my program to see if everything is fine,but after adding a file to upload,my software close unexpectedly (no raising error,just crash)
here is a basic working example of my code
problem is in Uploader class,the upload method.
I can't understand what I'm doing wrong,can some one give me hint or a solution ?
I ask this question in qt forum but no answer,here is last place which can answer my question,so please help me on this one
Thanks

[anda_skoa]

You need to have a look at the stack trace from when the crash happens.

For example by running the program in a debugger or checking the backtrace on crash, etc.

Cheers,
_