The code I am basically using for capturing samples is this:
http://gnuradio.org/trac/wiki/UsrpFAQ/CppInterface

As my code is completely based on C++, I can't use usrp.tune(self.u, 0,
self.subdev,106.2e6), instead can I use the following method from
usrp_standard:

bool usrp_standard_rx::tune(int chan, db_base_sptr db, double target_freq,
usrp_tune_result *result)

in this manner:

// Set DDC center frequency
   urx->set_rx_freq (0, center_freq);
//What should be my center_freq here?

//Set Tuning Frequency
urx->tune(0, db, 106.2e6, result)

// How should I pass the value of db and result?

 // Set Number of channels
   urx->set_nchannels(1);

 // Set ADC PGA gain
   urx->set_pga(0,gain);

 // Set FPGA Mux
   urx->set_mux(0x32103210); // Board A only

 // Set DDC decimation rate
   urx->set_decim_rate(decim);

 // Set DDC phase
   urx->set_ddc_phase(0,0);
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