I created a new 'C++ library' project in Qt, which has the following header file:
#include "Test_global.h"
#include <QString>
#include <QTcpServer>
class TESTSHARED_EXPORT Test : QTcpServer
{
Q_OJECT
public:
Test();
~Test();
signals:
void NewMessage(QString);
};
(The implementation file is basically empty.)
When I try to build the object, I get errors:
Test.h:8: error: ISO C++ forbids declaration of ‘Q_OJECT’ with no type
Test.h:10: error: expected ‘;’ before ‘public’
Test.cpp:3: error: definition of implicitly-declared 'Test::Test()'
So it looks like moc isn't processing the file at all. What have I done wrong?
It should be Q_OBJECT, not Q_OJECT.
Related
In order to test some functions of a Qt application (named qtapp), I build the Qt application as lib/dll library. The ctor and dtor have been correctly exported in the library. However compiling the test project (a Qt console project named consoleTest) is always running to the following link errors:
Link:
1> Bibliothek "C:\Users\gmbh\test\x64\Debug\consoleTest.lib" und Objekt C:\Users\gmbh\test\x64\Debug\consoleTest.exp" werden erstellt.
1>moc_testFour.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const qtapp::staticMetaObject" (?staticMetaObject#qtapp##2UQMetaObject##B)".
1>testFour.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const qtapp::staticMetaObject" (?staticMetaObject#qtapp##2UQMetaObject##B)".
1>C:\Users\gmbh\test\x64\Debug\consoleTest.exe : fatal error LNK1120: 1 nicht aufgelöste Externe
The Qt application is quite simple:
#ifndef QTAPP_H
#define QTAPP_H
#include <QtWidgets/QMainWindow>
#include "ui_qtapp.h"
class __declspec(dllexport) qtapp : public QMainWindow
{
Q_OBJECT
public:
qtapp(QWidget* parent = 0);
~qtapp();
private:
Ui::qtappClass ui;
};
#endif // QTAPP_H
Implementation:
#include "qtapp.h"
__declspec(dllexport) qtapp::qtapp(QWidget* parent)
: QMainWindow(parent)
{
ui.setupUi(this);
}
__declspec(dllexport) qtapp::~qtapp()
{
}
If I simply include #include "qtapp.h" in the test project, the compiler yields the above error.
My questions:
What are the causes for the errors?
How to correctly deploy a Qt
application as lib?
My compiler is visual studio 2013, qt has the version of 5.4.2
That's actually a question independent of Qt. When linking an application against the library you need to have __declspec(dllimport) instead of __declspec(dllexport).
To achieve that, one usually uses defines that change when linking the library vs linking the application against the library. Microsoft has a help page on that "Importing into an Application Using __declspec(dllimport)".
The Qt documentation provides another one. The one thing where Qt can help, is replacing the __declspec by a cross-platform Q_DECL_IMPORT.
I have recently installed MS Visual Studio 2015 with the Arduino plugin "Visual Micro".
Everything works fine, upload a sketch etc. Except when I try to compile my code when I use FreeRTOS. I downloaded the FreeRTOS libary through the Arduino IDE (library manager). Therefore(in MS VS 2015) I could chose to include the library in MS VS 2015. So I included the library in one of my sketches. Below you see my code example. Within the Arduino IDE i can compile the code and upload it to the device, but in MS VS there are some errors.
#include <timers.h>
#include <task.h>
#include <StackMacros.h>
#include <semphr.h>
#include <queue.h>
#include <projdefs.h>
#include <portmacro.h>
#include <portable.h>
#include <mpu_wrappers.h>
#include <list.h>
#include <FreeRTOSVariant.h>
#include <FreeRTOSConfig.h>
#include <event_groups.h>
#include <croutine.h>
#include <Arduino_FreeRTOS.h>
//define Tasks
void TaskBlinkSlow(void *pvParameters);
void TaskBlinkFast(void *pvParameters);
void setup()
{
/* add setup code here */
xTaskCreate(TaskBlinkSlow, "TaskSlow", 128, NULL, 1, NULL);
xTaskCreate(TaskBlinkFast, "TaskFast", 128, NULL, 2, NULL);
pinMode(13, OUTPUT);
}
void loop()
{
//Empty, things are done in tasks!!!
}
void TaskBlinkSlow(void * pvParameters)
{
for (;;) {
for (int i = 0; i < 8; i++) {
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
delay(1000);
}
vTaskDelay(5000 / portTICK_PERIOD_MS);
}
}
void TaskBlinkFast(void * pvParameters)
{
for (;;) {
digitalWrite(13, HIGH);
delay(500);
digitalWrite(13, LOW);
delay(500);
}
}
At the end of this post you will find the short snippet of the compilers error log. Maybe someone already came around the same issue and has a quick fix.
An example debugger breakpoint has been created. To switch the demo
breakpoint off, deselect Visual Micro>Tutorial Mode.
Compiling debug version of 'FreeRTOS' for 'Arduino/Genuino Uno'
FreeRTOS.ino:In file included from timers.h:75:3: error: #error
"include Arduino_FreeRTOS.h must appear in source files before include
timers.h" :#error "include Arduino_FreeRTOS.h must appear in source
files before include timers.h" timers.h:In file included from
FreeRTOS.ino:from task.h:75:3: error: #error "include
Arduino_FreeRTOS.h must appear in source files before include task.h"
:#error "include Arduino_FreeRTOS.h must appear in source files before
include task.h" task.h:In file included from timers.h:from
FreeRTOS.ino:from list.h:99:3: error: #error Arduino_FreeRTOS.h must
be included before list.h :#error Arduino_FreeRTOS.h must be included
before list.h FreeRTOS.ino:In file included from semphr.h:74:3: error:
error "include Arduino_FreeRTOS.h" must appear in source files before "include semphr.h" :#error "include Arduino_FreeRTOS.h" must appear in
source files before "include semphr.h" semphr.h:In file included from
FreeRTOS.ino:from queue.h:75:3: error: #error "include
Arduino_FreeRTOS.h" must appear in source files before "include
queue.h" :#error "include Arduino_FreeRTOS.h" must appear in source
files before "include queue.h" FreeRTOS.ino:In file included from
list.h:99:3: error: #error Arduino_FreeRTOS.h must be included before
list.h :#error Arduino_FreeRTOS.h must be included before list.h
task.h:In file included from timers.h:from FreeRTOS.ino:from
list.h:184:22: error: 'TickType_t' does not name a type
:configLIST_VOLATILE TickType_t xItemValue; *< The value being
listed. In most cases this is used to sort the list in descending
order. * list.h:196:22: error: 'TickType_t' does not name a type
:configLIST_VOLATILE TickType_t xItemValue list.h:208:22: error:
'UBaseType_t' does not name a type :configLIST_VOLATILE UBaseType_t
uxNumberOfItems list.h:386:47: error: expected initializer before
'PRIVILEGED_FUNCTION :void vListInitialise( List_t * const pxList )
PRIVILEGED_FUNCTION list.h:397:55: error: expected initializer before
'PRIVILEGED_FUNCTION :void vListInitialiseItem( ListItem_t * const
pxItem ) PRIVILEGED_FUNCTION list.h:410:77: error: expected
initializer before 'PRIVILEGED_FUNCTION :void vListInsert( List_t *
const pxList, ListItem_t * const pxNewListItem ) PRIVILEGED_FUNCTION
list.h:431:80: error: expected initializer before 'PRIVILEGED_FUNCTION
:void vListInsertEnd( List_t * const pxList, ListItem_t * const
pxNewListItem ) PRIVILEGED_FUNCTION list.h:446:1: error: 'UBaseType_t'
does not name a type :UBaseType_t uxListRemove( ListItem_t * const
pxItemToRemove ) PRIVILEGED_FUNCTION timers.h:In file included from
FreeRTOS.ino:from task.h:109:20: error: ISO C++ forbids declaration of
'BaseType_t' with no type [-fpermissive] :typedef BaseType_t
(*TaskHookFunction_t)( void * ) task.h:109:20: error: typedef
'BaseType_t' is initialized (use decltype instead) task.h:109:22:
error: 'TaskHookFunction_t' was not declared in this scope :typedef
BaseType_t (*TaskHookFunction_t)( void * ) timers.h:In file included
from FreeRTOS.ino:from task.h:136:2: error: 'BaseType_t' does not name
a type :BaseType_t xOverflowCount task.h:137:2: error: 'TickType_t'
does not name a type :TickType_t xTimeOnEntering task.h:146:2: error:
'uint32_t' does not name a type :uint32_t ulLengthInBytes
task.h:147:2: error: 'uint32_t' does not name a type :uint32_t
ulParameters task.h:155:2: error: 'TaskFunction_t' does not name a
type :TaskFunction_t pvTaskCode task.h:157:2: error: 'uint16_t' does
not name a type :uint16_t usStackDepth task.h:159:2: error:
'UBaseType_t' does not name a type :UBaseType_t uxPriority
task.h:160:2: error: 'StackType_t' does not name a type :StackType_t
*puxStackBuffer task.h:161:27: error: 'portNUM_CONFIGURABLE_REGIONS' was not declared in this scope :MemoryRegion_t xRegions[
portNUM_CONFIGURABLE_REGIONS ] task.h:170:2: error: 'UBaseType_t' does
not name a type :UBaseType_t xTaskNumber; * A number unique to the
task. * task.h:172:2: error: 'UBaseType_t' does not name a type
:UBaseType_t uxCurrentPriority; * The priority at which the task was
running (may be inherited) when the structure was populated. *
task.h:173:2: error: 'UBaseType_t' does not name a type :UBaseType_t
uxBasePriority; * The priority to which the task will return if the
task's current priority has been inherited to avoid unbounded priority
inversion when obtaining a mutex. Only valid if configUSE_MUTEXES is
defined as 1 in FreeRTOSConfig.h. * timers.h:In file include
If you read the error messages, the issue is explained clearly.
include Arduino_FreeRTOS.h must appear first.
Your example shows it included last.
Put it first and the errors will go away.
Arduino_FreeRTOS.h includes many definitions that are used in other places, hence the need for it to be first.
Unrelated to your question, but using delay() is nasty as it consumes CPU cycles needlessly. Try vTaskDelay() as alternative which defers (or blocks) to the Scheduler to unblock other Tasks or run the idle Task which is the Arduino loop() function.
The loop() function can then put the CPU to sleep, reducing power consumption. See the feilipu.me post on topic for more.
vTaskDelay() counts Ticks, so hence the need to divide by the Tick period in milliseconds. i.e.
Time in ms / portTICK_PERIOD_MS = Ticks
#include <Arduino_FreeRTOS.h>
#include <croutine.h>
#include <event_groups.h>
#include <FreeRTOSConfig.h>
#include <FreeRTOSVariant.h>
#include <list.h>
#include <mpu_wrappers.h>
#include <portable.h>
#include <portmacro.h>
#include <projdefs.h>
#include <queue.h>
#include <semphr.h>
#include <Stack_Macros.h>
#include <task.h>
#include <timers.h>
void setup()
{
}
void loop()
{
}
Found the issue, the includes where in the wrong order: dont know why;).
You cant only include freeRTOS in MS VS you need to correct the order of the includes by yourself.
Here is the correct order:
#include <Arduino_FreeRTOS.h>
#include <croutine.h>
#include <event_groups.h>
#include <FreeRTOSConfig.h>
#include <FreeRTOSVariant.h>
#include <list.h>
#include <mpu_wrappers.h>
#include <portable.h>
#include <portmacro.h>
#include <projdefs.h>
#include <queue.h>
#include <semphr.h>
#include <StackMacros.h>
#include <task.h>
#include <timers.h>
I'm not sure about the Arduino code you are referring to, but normally there is no reason to include FreeRTOSConfig.h directly - instead include FreeRTOS.h first, and that will get the ordering of the port layer files and FreeRTOSConfig.h files correct for you, then include the header files that contain the API functions you want to use.
I've got a relatively simple Qt 5.0 project that uses CMake 2.8.9:
CMakeLists.txt:
cmake_minimum_required(VERSION 2.8.9)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
project(hello-world)
find_package(Qt5Widgets REQUIRED)
qt5_wrap_ui(hello-world_UI MainWindow.ui)
add_executable(hello-world MainWindow.cpp main.cpp ${hello-world_UI})
qt5_use_modules(hello-world Widgets)
MainWindow.h:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
virtual ~MainWindow();
private:
Ui::MainWindow * const ui;
};
#endif // CMAINWINDOW_H
MainWindow.cpp:
#include "MainWindow.h"
#include "ui_MainWindow.h"
MainWindow::MainWindow()
: ui(new Ui::MainWindow)
{
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp:
#include <QApplication>
#include "MainWindow.h"
int main(int argc, char * argv[])
{
QApplication app(argc, argv);
MainWindow win;
win.show();
return app.exec();
}
The project also includes a .ui file created with Qt Creator 2.6.1 (MainWindow.ui).
When I attempt to build the file with g++ on Linux, I receive the following errors:
CMakeFiles/hello-world.dir/MainWindow.cpp.o: In function `MainWindow::MainWindow()':
MainWindow.cpp:(.text+0x3b): undefined reference to `vtable for MainWindow'
MainWindow.cpp:(.text+0x4d): undefined reference to `vtable for MainWindow'
CMakeFiles/hello-world.dir/MainWindow.cpp.o: In function `MainWindow::~MainWindow()':
MainWindow.cpp:(.text+0xaf): undefined reference to `vtable for MainWindow'
MainWindow.cpp:(.text+0xc1): undefined reference to `vtable for MainWindow'
collect2: error: ld returned 1 exit status
What could possibly be causing this sort of error? I recently switched to CMake from qmake and I never remember running into this much trouble getting a trivial example to compile. What am I doing wrong?
Edit: here is the command being used to link everything:
/usr/bin/c++ CMakeFiles/hello-world.dir/MainWindow.cpp.o
CMakeFiles/hello-world.dir/main.cpp.o -o hello-world -rdynamic
/usr/local/Qt-5.0.0/lib/libQt5Widgets.so.5.0.0
/usr/local/Qt-5.0.0/lib/libQt5Gui.so.5.0.0
/usr/local/Qt-5.0.0/lib/libQt5Core.so.5.0.0
-Wl,-rpath,/usr/local/Qt-5.0.0/lib
Turns out I forgot:
set(CMAKE_AUTOMOC ON)
At the top of the CMakeLists.txt file.
I struggled with this for a long time using all the hints published here:
http://doc.qt.io/qt-5/cmake-manual.html
And here
https://www.kdab.com/using-cmake-with-qt-5/
What I had to do was specify things in the right order. For example, the following is the top of my CMakeLists.txt. Note that the two CMAKE set directives come before add_executable. Once I did this, I was able to link without undefined symbols and vtable references. I just thought I'd post this for the benefit of others.
cmake_minimum_required (VERSION 2.8)
set (CMAKE_AUTOMOC ON)
set (CMAKE_INCLUDE_CURRENT_DIR ON)
add_executable(FHSpectrumSensor wideband_seq_spectrum_sensor.cpp sensor.cpp gui.cpp ${gui_SRC})
Later in the CMakeLists.txt I have the following:
find_package(Qt5Widgets REQUIRED)
find_package(Qt5Charts REQUIRED)
find_package(Qt5Core REQUIRED)
qt5_use_modules(FHSpectrumSensor Widgets Charts)
qt5_wrap_cpp(gui_SRC gui.h gui.cpp)
That did the trick.
I also ran into this problem yesterday and the above mentioned answers did't help. I already used set (CMAKE_AUTOMOC ON) and also qt5_wrap_cpp.
I tried to remember what I did, because I had a working version but it stopped working after "some" changes. I finally remembered that I tried to split the include files into a separate directory hierarchy. After reverting that and putting the include files back into the CMakeLists.txt it worked again. I sure don't know why, and I would like to know what went wrong, but I settled now for keeping the includes near the cpp files.
set(SOURCES
buffer.h
ITVSet.h
MainWindow.h
MainWindow.cpp
TVSet.h
TVSet.cpp
)
I have a very strange error in my Qt project. Here is the code, the main_window.h:
#include <QtGui>
#include <QtSql>
class main_window : public QTabWidget
{
Q_OBJECT
/// #name List Widgets
private:
QListWidget* m_documents_list;
....
and here is main_window.cpp:
...
void main_window::create_documents_widget()
{
m_documents = new QWidget(this);
m_documents_list = new QListWidget(m_documents);
}
...
The problem that I can't understand is in QListView, I'm not using it in my project. There is only QListWidget, but when I'm trying to build the project the following errors occur:
qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
qlistview.h:194: error: expected ',' or '...' before '&' token
Also the following strange errors:
qlistwidget.h:308: error: no 'void QListWidget::removeItemWidget(QListWidgetItem)' member function declared in class 'QListWidget'*
qlistwidget.h:311: error: no 'void QListWidget::addItem(QListWidgetItem)' member function declared in class 'QListWidget'*
qlistwidget.h:314: error: no 'QListWidgetItem QListWidget::itemAt(int, int) const' member function declared in class 'QListWidget'*
etc.
Thanks in advance.
UPD: I'm using QtCreator 2.2.1 on Windows 7.
UPD2: Qt version is 4.7.1.
UPD3: The complete output
In file included from c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/QtGui:68,
from ..\my_project\/main_window.h:4,
from ..\my_project\main.cpp:2:
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: expected ',' or '...' before '&' token
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: expected ';' before '&' token
In file included from c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/QtGui:69,
from ..\my_project\/main_window.h:4,
from ..\my_project\main.cpp:2:
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:202: error: redefinition of 'class QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:58: error: previous definition of 'class QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:308: error: no 'void QListWidget::removeItemWidget(QListWidgetItem*)' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:311: error: no 'void QListWidget::addItem(QListWidgetItem*)' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:314: error: no 'QListWidgetItem* QListWidget::itemAt(int, int) const' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'void QListWidgetItem::setSelected(bool)':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:318: error: 'class QListWidget' has no member named 'setItemSelected'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'bool QListWidgetItem::isSelected() const':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:321: error: 'class QListWidget' has no member named 'isItemSelected'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'void QListWidgetItem::setHidden(bool)':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:324: error: 'class QListWidget' has no member named 'setItemHidden'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'bool QListWidgetItem::isHidden() const':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:327: error: 'class QListWidget' has no member named 'isItemHidden'
Firstly - you should also mention qt version, as in this case that's most important.
This seems like some weird quirk of compiler or qt - my recomendation would be first to create simplest program where problem occurs. If it shows also in program like
#include <QtGui/QListWidget>
int main(int argc, char* argv[]){
QListWidget* w = 0;
}
then it is some problem with qt headers of compiler - then answer cannot be provided from data provided. If it works, then try to slowly add other elements of your code to this simple file - most likely at some point you will get the same error again - then you will know that last added piece of code is guilty. Some additional thinking might be required to figure out how to remove problem once located.
It should be noted that QListWidget inherits from QListView, so you are indirectly using it.
The error your getting looks like you're simply missing a #include <QListWidget> line in your header file.
Also, it could be that that you're missing #include guards in your header file
#ifndef MYCLASS
#define MYCLASS
class MyClass { ... };
#endif
If your header file is #included by more than one project then that would explain the errors you're seeing.
Greetings all,
I am trying to implement a QT Plugin with CMake. But this "Q_EXPORT_PLUGIN2" directive stops my class from compiling. I can compile the plugin if I commented this out,but it won't work as a plugin if I do so.
QT doc says:
Q_EXPORT_PLUGIN2 ( PluginName, ClassName )
The value of PluginName should
correspond to the TARGET specified in
the plugin's project file
What about in CMake case? What should be the value for 'PluginName'?
Here is my Plugin Interface :
#ifndef RZPLUGIN3DVIEWERFACTORY_H_
#define RZPLUGIN3DVIEWERFACTORY_H_
#include <QObject>
#include "plugin/IRzPluginFactory.h"
class RzPlugin3DViewerFactory :public QObject,public IRzPluginFactory{
Q_OBJECT
Q_INTERFACES(IRzPluginFactory)
private:
QString uid;
public:
RzPlugin3DViewerFactory();
virtual ~RzPlugin3DViewerFactory();
IRzPlugin* createPluginInstance();
IRzPluginContext* createPluginContextInstance();
QString & getPluginUID();
};
#endif /* RZPLUGIN3DVIEWERFACTORY_H_ */
And implementation
#include "RzPlugin3DViewerFactory.h"
#include "RzPlugin3DViewer.h"
RzPlugin3DViewerFactory::RzPlugin3DViewerFactory() {
uid.append("RzPlugin3DView");
}
RzPlugin3DViewerFactory::~RzPlugin3DViewerFactory() {
// TODO Auto-generated destructor stub
}
IRzPlugin* RzPlugin3DViewerFactory::createPluginInstance(){
RzPlugin3DViewer *p=new RzPlugin3DViewer;
return p;
}
IRzPluginContext* RzPlugin3DViewerFactory::createPluginContextInstance()
{
return NULL;
}
QString & RzPlugin3DViewerFactory::getPluginUID()
{
return uid;
}
Q_EXPORT_PLUGIN2(pnp_extrafilters, RzPlugin3DViewerFactory)
Error Message is :
[ 12%] Building CXX object
CMakeFiles/RzDL3DView.dir/RzPlugin3DViewerFactory.cpp
.obj
C:\svn\osaka3d\trunk\osaka3d\rinzo-platform\src\dlplugins\threedviewer\RzPlugin3
DViewerFactory.cpp:36: error: expected
constructor, destructor, or type
conversi on before '(' token make[2]:
*** [CMakeFiles/RzDL3DView.dir/RzPlugin3DViewerFactory.cpp.obj]
Error 1
make[1]: *
[CMakeFiles/RzDL3DView.dir/all] Error
2 make: * [all] Error 2
Ok , I fixed the problem by giving the project name specified in Cmake file.
PROJECT (RinzoDLPlugin3DViewer CXX C)
So,now in CPP file its
Q_EXPORT_PLUGIN2(RinzoDLPlugin3DViewer , RzPlugin3DViewerFactory)
and included qpluginh.h
#include <qplugin.h>
I think the macro should be Q_EXPORT_PLUGIN2(pnp_rzplugin3dviewerfactory, RzPlugin3DViewerFactory) or whatever you have listed as the target name in the .pro file. In fact, the "pnp" part stands for "Plug & Paint" which is the Qt demo program for writing plugins :)
Edit:
Since I misunderstood how CMake works, this information isn't really relevant to the OP. I did do a quick search however and turned up this discussion of Qt, plugins and CMake. I hope there is some useful info there.
http://lists.trolltech.com/qt-interest/2007-05/msg00506.html