[Qt-interest] Linker Error I do not understand

[Jason H]

Either that class is not in that library, or those functions aren't in the library. Sure, you have the .h, which specifies the signature, but when it looked at the library it wasn't there.

Either update your library to cinlcude that class, or link in the QCW class's library.



----- Original Message ----
From: Matthias Pospiech <matthias.pospiech at gmx.de>
To: qt-interest at trolltech.com
Sent: Mon, June 21, 2010 4:32:59 PM
Subject: [Qt-interest] Linker Error I do not understand

Hi,
I have a project which fails at a single class in linking. I get these 
errors:

mainwindow.obj:-1: error:  unresolved external symbol 
"__declspec(dllimport) public: __thiscall 
QCameraWidget::QCameraWidget(class QWidget *)" 
(__imp_??0QCameraWidget@@QAE at PAVQWidget@@@Z) referenced in function 
"public: void __thiscall Ui_MainWindowClass::setupUi(class QMainWindow 
*)" (?setupUi at Ui_MainWindowClass@@QAEXPAVQMainWindow@@@Z)
mainwindow.obj:-1: error:  unresolved external symbol "protected: 
virtual void __thiscall QCameraWidget::paintEvent(class QPaintEvent *)" 
(?paintEvent at QCameraWidget@@MAEXPAVQPaintEvent@@@Z)

and such, for all methods of the QCameraWidget class, all failting to 
link in mainwindow.obj

However I load the header in the cpp file, as well in the ui_* file.

#include "QCameraWidget.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindowClass)
    , camera(new QuEyeCamera)
{
...


the Class is build in a dll, which is linked with
debug:LIBS += -L../lib/$${COMPILER}/debug/ -l$${LIBRARY_NAME}

in the pro file. All other classed do not fail, so I expect that the 
library .lib file is loaded actually.

So now I do not know what to check else. Any ideas?

Matthias
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