qt - undefined reference to `vtable for myObj' in qt console application - signals and slots

hskoglund

Hi, the Q_OBJECT macro in your class declaration needs to be processed by the moc compiler. Easiest is to move your class declaration into your main.h.
EDIT: forgot probably you don't have a main.h yet, if so, just create it and put the class declaration inside it. And don't forget to #include main.h in your main.cpp :-)

yuvaram

Hi CybeX,
I have experimented your program. All the syntax are perfect, there is a issue with CLASS name (myObj).
with class name myObj i m getting linker error.
But by changing the class name and building there is no error. So may be there is some dependency issue with class name myObj.
change it to myObj1 and try.

Devopia53

@yuvaram

Hi.

You can just add the following line in main.cpp:

[...]
#include "main.moc"

int main(int argc, char *argv[])
{
[...]

and then run qmake.

yuvaram

@Devopia53
Thank for correcting.

But after adding #include "main.moc", (run qmake is also done) following error while building.

Error: dependent 'debug\main.moc' does not exist.

Devopia53

@yuvaram

Really? :(

I'm works fine.
If so, you can delete all of the previously built directories and then save main.cpp and rebuild all. Also, check where the main.moc file is generated.

Good luck!.

SGaist

Hi,

If you really want to use that technique, the moc include should be the last line of main.cpp file

yuvaram

Hi ,
main.moc file is not generating.

mrjj

@yuvaram
Hi
For less pain. just use a .h file. :)

Delete the build folder and rebuild all.

Devopia53

@yuvaram

If so, compile it with Network Download Example, which is officially available from Qt.

Stonge357

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