For some reason, whenever I try to use sample code my compiler refuses to cooperate.
The sample code I am using comes from here: http://qt-project.org/doc/qt-4.8/multimedia-videowidget.html ; I have currently only used the VideoWidgetSurface class.
As far as I can tell, my code is 100% the same as the sample's, and I have no coding mistakes.
However, upon compiling I receive:
1>moc_VideoWidgetSurface.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)
public: virtual void * __thiscall QAbstractVideoSurface::qt_metacast(char const *)" (__imp_?
qt_metacast@QAbstractVideoSurface@@UAEPAXPBD@Z) referenced in function "public: virtual void *
__thiscall VideoWidgetSurface::qt_metacast(char const *)" (?
qt_metacast@VideoWidgetSurface@@UAEPAXPBD@Z)
1>moc_VideoWidgetSurface.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)
public: virtual int __thiscall QAbstractVideoSurface::qt_metacall(enum QMetaObject::Call,int,void *
*)" (__imp_?qt_metacall@QAbstractVideoSurface@@UAEHW4Call@QMetaObject@@HPAPAX@Z) referenced in
function "public: virtual int __thiscall VideoWidgetSurface::qt_metacall(enum
QMetaObject::Call,int,void * *)"(?qt_metacall@VideoWidgetSurface@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
. . . .
1>VideoWidgetSurface.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public:
class QSize __thiscall QVideoSurfaceFormat::frameSize(void)const " (__imp_?
frameSize@QVideoSurfaceFormat@@QBE?AVQSize@@XZ) referenced in function "public: bool __thiscall
VideoWidgetSurface::isFormatSupported(class QVideoSurfaceFormat const &,class QVideoSurfaceFormat
*)const " (?isFormatSupported@VideoWidgetSurface@@QBE_NABVQVideoSurfaceFormat@@PAV2@@Z)
1>VideoWidgetSurface.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public:
static enum QImage::Format __cdecl QVideoFrame::imageFormatFromPixelFormat(enum
QVideoFrame::PixelFormat)" (__imp_?imageFormatFromPixelFormat@QVideoFrame@@SA?
AW4Format@QImage@@W4PixelFormat@1@@Z) referenced in function "public: bool __thiscall
VideoWidgetSurface::isFormatSupported(class QVideoSurfaceFormat const &,class QVideoSurfaceFormat
*)const " (?isFormatSupported@VideoWidgetSurface@@QBE_NABVQVideoSurfaceFormat@@PAV2@@Z)
. . . .
1>C:\Users\Owner\documents\visual studio 2010\Projects\ParticleTracker\Debug\ParticleTracker.exe : fatal error LNK1120: 30 unresolved externals
[removed errors, because there are a lot]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
I don't completely understand why I'm receiving this error. Up till now, I have had minimal issues with Qt, and have successfully run my programs (in Visual Studio '10, not using qmake).
I have double checked that I have linked to all of the possible .lib files in the Additional dependencies section, and I am not missing any.
It appears as if this error exists only for the Multimedia module.I searched for an existing Multimedia .lib but could not find any.
I have tried the following cmd command:
moc -I"%QTDIR%\include" -I"%QTDIR%\include\QtCore" -I"%QTDIR%\include\QtGui" -I"%QTDIR%\include\QtMultimedia" -omoc_VideoWidgetSurface.cpp VideoWidgetSurface.h
But it failed to work, and I still receive errors.
Any help is much appreciated. If you would like to see more of my code or my links/includes, I will share those as well. Thank you!
