Read all point and insert into array - c++

Question

I came across this gdal code to read the elevation point for specific location.
This code allow me to just read only one point. The elevation file information:
Upper Left X = 103.0000 Upper Left Y = 4.0000
Lower Right X = 104.0000 Lower Right Y = 3.0000
No. of columns = 3601, No. of rows = 3601
How can get read all the elevation point and store it in vector array?
int _tmain(int argc, _TCHAR* argv[])
{
const char* pszFilename = "C:\\Elevation.DT2";
double adfGeoTransform[6];
float buffEleveation[1];
int row;
int col;
std::vector<float> elevationVecArr;
GDALRasterBand *poBand;
GDALDataset *poDataset;
GDALAllRegister();
poDataset = (GDALDataset *) GDALOpen( pszFilename, GA_ReadOnly );
printf( "Driver: %s/%s\n",
poDataset->GetDriver()->GetDescription(),
poDataset->GetDriver()->GetMetadataItem( GDAL_DMD_LONGNAME ) );
printf( "Size is %dx%dx%d\n",
poDataset->GetRasterXSize(),poDataset->GetRasterYSize(),
poDataset->GetRasterCount() );
if( poDataset->GetProjectionRef() != NULL )
printf( "Projection is `%s'\n", poDataset->GetProjectionRef() );
if( poDataset->GetGeoTransform( adfGeoTransform ) == CE_None )
{
printf( "Origin = (%.6f,%.6f)\n",
adfGeoTransform[0], adfGeoTransform[3] );
printf( "Pixel Size = (%.6f,%.6f)\n",
adfGeoTransform[1], adfGeoTransform[5] );
}
poDataset->GetGeoTransform(adfGeoTransform);
poBand = poDataset->GetRasterBand(1);
float X = (103.0000);
float Y = (4.000);
row = (int)((adfGeoTransform[3] - Y) / -adfGeoTransform[5]); // ULY - xcoord / -N-S CellSize;
col = (int)((X - adfGeoTransform[0]) / adfGeoTransform[1]); // xcoord - ULX / E-W CellSize
poBand->RasterIO(GF_Read, col, row, 1, 1, buffEleveation, 1, 1, GDT_Float32, 0, 0); // read the cell value
float elevationValue = buffEleveation[0];
elevationVecArr.push_back(buffEleveation[0]);
printf("Elevation = %.f", elevationValue);
getchar();
return 0;
}

Answer 1

According to the documentation at https://gdal.org/doxygen/classGDALRasterBand.html#a75d4af97b3436a4e79d9759eedf89af4 you can just specify the range you want to read.
constexpr int rows=3601;
constexpr int cols=3601;
std::vector<float> buffEleveation(rows*cols);
// Since we want to read all the data we set:
// nXOff/nYOff to 0
// nXSize/nYSize to 3601
// nBufXSize/nBufXSize to 3601.
poBand->RasterIO(GF_Read, 0, 0, rows, cols, buffEleveation.data(), rows, cols, GDT_Float32, 0, 0); // read all elevation values.