The DLL was successfully built but it is not working - c++

Question

I use the example Plugin.cpp from amibroker ADK. I make a directory 'ASCII' under the folder 'amibroker' and put all the data inside named *.AQI. But no data found in amibroker. Is there something I changed in function GetQuotesEx cause the problem?
PLUGINAPI int GetQuotesEx( LPCTSTR pszTicker, int nPeriodicity, int nLastValid, int nSize, struct Quotation *pQuotes, GQEContext *pContext )
{
char filename[256];
FILE* fh;
int iLines = 0;
// format path to the file (we are using relative path)
sprintf_s(filename, "ASCII\\%s.AQI", pszTicker);
// open file for reading
fopen_s(&fh, filename, "r");
// if file is successfully opened read it and fill quotation array
if (fh)
{
char line[ 256 ];
// read the line of text until the end of text
// but not more than array size provided by AmiBroker
while( fgets( line, sizeof( line ), fh ) && iLines < nSize )
{
// get array entry
struct Quotation *qt = &pQuotes[ iLines ];
char* pTmp = NULL;
// parse line contents: divide tokens separated by comma (strtok) and interpret values
// date and time first
int datenum = atoi( strtok_s( line, ",", &pTmp) ); // YYMMDD
int timenum = atoi( strtok_s( NULL, ",", &pTmp) ); // HHMM
// unpack datenum and timenum and store date/time
qt->DateTime.Date = 0; // make sure that date structure is intialized with zero
qt->DateTime.PackDate.Minute = timenum % 100;
qt->DateTime.PackDate.Hour = timenum / 100;
qt->DateTime.PackDate.Year = 2000 + datenum / 10000;
qt->DateTime.PackDate.Month = ( datenum / 100 ) % 100;
qt->DateTime.PackDate.Day = datenum % 100;
// now OHLC price fields
qt->Open = (float) atof( strtok_s( NULL, ",", &pTmp) );
qt->High = (float) atof( strtok_s( NULL, ",", &pTmp) );
qt->Low = (float) atof( strtok_s( NULL, ",", &pTmp) );
qt->Price = (float) atof( strtok_s( NULL, ",", &pTmp) ); // close price
// ... and Volume
qt->Volume = (float) atof( strtok_s( NULL, ",\n", &pTmp) );
iLines++;
}
// close the file once we are done
fclose( fh );
}
// return number of lines read which is equal to
// number of quotes
return iLines;
}