Qt 无法打开包含文件：'QPrinter'

Question

I am new to Qt. Downloaded source code for a Qt application of SourceForge, and tried to build and run it. After working through a few similar problems by adding QT += statements to .pro files, I am stuck on this one:

On attempting to build in Qt Creator, I get errors saying

error: C1083: Cannot open include file: 'QPrinter': No such file or directory

I tried adding QT += printsupport to the .pro file, cleaning, and rebuilding, but that gives this error

Error: dependent '..\..\..\..\..\..\..\..\..\..\..\Qt\Qt5.1.1\5.1.1\msvc2012_64\include\QtPrintSupport\qtprintsupportglobal.h' does not exist."

When I go to C:\Qt\Qt5.1.1\5.1.1\msvc2012_64\include\QtPrintSupport , qtprintsupportglobal.h IS THERE!

Answer 1

您必须将 QPrinter 支持添加到项目的 .pro 文件中：

QT += printsupport

Answer 2

In my case the solution was to

Delete the shadow build directory and build again

after adding printsupport , as @KubaOber suggests in the comments.

Answer 3

Easy mistake to make: After you edit your .pro

QT       += printsupport

You have to SAVE the file before your .h will be aware of it.

Answer 4

Because QMake will eventually be dropped in favor of CMake, here's the solution for CMake users:

Pass PrintSupport to the find_package call, to the right side of COMPONENTS , like in this example:

find_package(Qt5 ${QT5_MIN_VERSION} REQUIRED COMPONENTS Core Gui Qml QuickControls2 PrintSupport)