error C2027: use of undefined type 'QBufferPrivate'

[QtAndMore]

Deal all,

I'm new to the world of Qt and still learning. Maybe my question is stupid, but I don't get it.

I have an older project with Qt 4.8.5, which uses the QtCore4.dll. Now I have to change a bit in the dll.
I just downloaded the original source code of Qt 4.8.5 from Qt website and tried to compile it with MSVC2008 and the Qt-msvc2008 Plug-In 1.1.9 without any changes by my side.

I tried it in that way:

• Open VS
• open the project file of the dll in C:\Qt\4.8.5\src\corelib
• Build Solution

Now I get this:

The error is in a moc-file. I can't even change something there.

I would really appreciate it if someone could help me!

[SGaist]

Hi and welcome to devnet,

You can't do that like that. You have to follow the instruction on how to build Qt in the documentation.

[QtAndMore]

http://doc.qt.io/archives/qt-4.8/install-win.html

I have done this installation progress before I tried it in the way I wrote. Or do you mean something different?

[SGaist]

And what project file did you open ?

[QtAndMore]

The corelib.pro in C:\Qt\4.8.5\src\corelib.

[SGaist]

But did you do a complete build before trying to fiddle with Qt in VS ?

[QtAndMore]

In the end I used command line to build the dll. Thanks for your help!