Online installer fails, offline installer worked but building a project fails

Gist

Thanks very much, Now I feel happy and I can relax :)
I am downloading Visual Studio, I have used it before (before 3 years ago) , I will also see MinGw.
I guess it would be better if the website of Qt did an explanation for beginners in the font of the downloading page, It would help them a lot, because when I was reading through google searching for a solution I saw some peoples have the same problem as I have, but they didn't get any feedback. Thank you very much. I hope to be productive with this forum :)
See you.

jsulm

@Gist Well, if you download Qt for VS2015 then you need VS2015, right? VS2015 cannot be included with Qt download as it is proprietary.

Gist

I downloaded Visual studio 2015, and I reinstalled Qt , but the problem still remains.

Gist

@SGaist, I downloaded Visual studio 2015, and I reinstalled Qt , but the problem still remains

jsulm

@Gist Did you install VS2015? If so did you install its C++ components as well (they are not installed by default)?

Gist

@jsulm I installed VS2015, but how can I install C++ components ?

jsulm

@Gist I think you need to start the installer again and select C++ components there.

I have a note: if you do not depend on VS then just install Qt for MinGW together with MinGW using Qt online installer, then you will have everything you need: compiler, debugger (for VS you need to install debugger tools which are not part of VS if you want to use debugger!). MinGW is the Windows port of GCC.

Gist

@jsulm, I have tried resolve the problem by installing VS but I failed, contrary to Qt for MinGW, There is no problem with it, I am working on it normally now.
The problem has been resolved.
Thanks for all of you: @jsulm , @SGaist, and @Wieland .

SGaist

Did you check that you selected the C++ tools when installing Visual Studio ? That's the important point.

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BTW, next time, please give your thread a meaningful title. Also choosing the best fitting subforum is highly appreciated. And when your problem is solved, mark the thread accordingly. We have a small visual forum guide for newcomers: Hitchhiker's Visual Guide to the Qt Forum and there is also the Forum general guide. One more thing: The image upload feature on our forum is broken, see How to insert image on this forum for a workaround. :-)