Qt LNK2019 Error with basic Qt5 application
c++, compiler-errors, lnk2019, qt, qt5
Solution
this a linker fault that can't link object files together, first delete all the `build directory`, then check that this line was added to your `.pro` file:
QT += core gui widgets
this should work, if gets fail again, you must give more information about your compiler and their `search path`, plus post your `.pro` file content here.
Problem
I am trying to follow a tutorial online and learn Qt5 with QtCreator 2.6.1 However, I went and attempted to write a basic application following this tutorial and I keep getting a linking error whenever I try to build the project: ``` #include <QtWidgets/QApplication> #include <QtWidgets/QLabel> int main(int argc, char *argv[]) { QApplication app(argc, argv); QLabel *label = new QLabel("Hello World"); label->show(); return app.exec(); } ``` Once I click "Build" I get about 50 errors resulting similar to the following: ``` main.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall QApplication::~QApplication(void)" (__imp_??1QApplication@@UAE@XZ) referenced in function _main main.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: static int __cdecl QApplication::exec(void)" (__imp_?exec@QApplication@@SAHXZ) referenced in function _main main.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: void __thiscall QWidget::show(void)" (__imp_?show@QWidget@@QAEXXZ) referenced in function _main ``` Is there a way I can fix this by linking the libraries, etc (assuming they aren't linking correctly)? If not, is there something else I can do to try and resolve this problem?