I've been toying around with this a bit more. I added "#include
<QWidget>" to the top of my program. I also added "QWidget*
parent = new QWidget;" before my call to qtgui_make_sink_c and
replaced "QWidget *parent=NULL" white "parent". I am now getting the
reference to `QWidget::QWidget(QWidget*,
top_block.cc:(.text+0x94f): undefined reference to
`qtgui_make_sink_c(int, int, double, double,
std::allocator<char> > const&, bool, bool, bool,
I've double checked what little documentation I can find on
qtgui_make_sink_c and I think that I am passing appropriate
parameters. Any thoughts on what might be wrong?
On 12/15/2012 02:07 AM, Daniel
I am attempting to use qt gui widgets in a C++ flowgraph. I
managed to get all of the build dependencies figured out, which
was no easy task in itself and required a lot of direct includes.
Anyway, the error that I am getting now deals directly with the
make function. The line that is giving me trouble is as follows
qtgui_sink_c_sptr qtsink =
qtgui_make_sink_c (fftsize, gr_firdes::WIN_HAMMING, 0, 1.0,
"Spectrum Display", true, true, true, true, QWidget
Information on this function is available here.
The error that I am getting is that parent is undefined. I really
don’t know what to put for this. Note that I have also tried
putting just NULL or just 0 and it throws an undefined reference
error (for the function call). I was wondering if someone could
give me some pointers on what to use for parent? While I would
eventually like to have both an fft and a time domain view in a
single window, I am currently just trying to get the fft to show
in its own window. Thanks ahead of time!