SDK_Exporter_params.cpp in SDK Exporter plugin for premiere pro cs4

This question is regarding the code in

exSDKGenerateDefaultParams(exportStdParms                *stdParms,
                                         exGenerateDefaultParamRec    *generateDefaultParamRec) function

The below function is called in the above function's code

exportInfoSuite->GetExportSourceInfo(    exporterPluginID,
                                                kExportInfo_VideoFrameRate,
                                                &seqFrameRate);

to get info for videoframerate in seqFrameRate

Then seqFrameRate.mFloat64 is compared with different valuesin the code segment

if(timeSuite)

{

     timeSuite->GetTicksPerSecond (&ticksPerSecond);

     if (seqFrameRate.mFloat64 > 29.97f &&
            seqFrameRate.mFloat64 < 29.98f ||
            seqFrameRate.mFloat64 < 0.1f ||
            seqFrameRate.mFloat64 > 60.0f) // Strange values fall into this case
        {
            timeSuite->GetTicksPerVideoFrame(kVideoFrameRate_NTSC, &seqFrameRateTicks);

        }

}

for assigning the appropriate value to seqFrameRateTicks

The problem i m facing is that the value of seqFrameRate.mFloat64

is coming out to be zero(why?).

Also, since the type of ticksPerSecond and seqFrameRateTicks

is PrTime(which is a 64 bit int), i want to know what will be the best way

to convert them into other 32 bit values(int, float etc).

Thank You

Agam