Re: [Discuss-gnuradio] QT GUI FFTSINK in C++ Flowgraph

[Daniel Labarowski]

Thanks for the replies guys. Tom, I have modified this flowgraph 
(extensively) from one of the examples and have been using its 
CMakeLists.txt file (modifying it along the way of course). The commands 
that I use to build it are

> mkdir build
> cd build
> cmake ../
> make

I believe that -l gnuradio-qtgui would be for g++. Since I am not using 
g++ directly I tried adding the following to my CMakeLists.txt file.


> # libgnuradio-qtgui.so
> #find_package(gnuradio-qtgui)
> include_directories(/usr/local/lib)

When the find_package command did not work, I commented it out and 
included the directory absolutely. I have had to do this a lot lately. 
Some of the library variables seem to have not gotten set by the build 
script (granted, this build is from the summer). Unfortunately I am 
still getting the

> undefined reference to `qtgui_make_sink_c(int, int, double, double, 
> std::basic_string<char, std::char_traits<char>, std::allocator<char> > 
> const&, bool, bool, bool, bool, QWidget*)'

error. My syntax is

> qtgui_sink_c_sptr qtsink = qtgui_make_sink_c (fftsize, 
> gr_firdes::WIN_HAMMING, 0, 1.0, "Spectrum Display", true, true, true, 
> true, NULL);

I am including the following relevant components

> #include <qtgui_sink_c.h>
> #include <QApplication>
> #include <QWidget>

Can anyone spot my mistake?

-Dan