[gdal-dev] write error

[weixj2003ld]

I use the following code to read data from a geotiff file and write it into a new one.the bands number is 6;
...
GDALDataset *poSrcDS,*poDstDS;
GDALRasterBand *poSrcBand,*poDstBand;
GDALDriver *poDstDriver;
double *m_AdGeoTransform=new double[6];
 
...
poDstDriver=GetGDALDriverManager()->GetDriverByName(poSrcDS->GetDriver()->GetDescrition());
poDstDS=poDstDriver->create(DstFilename,nX,nY,6,GDT_Float32,NULL);
poSrcDS->GetGeoTransform(m_AdGeoTransform)
poDstDS->SetGeoTransform(m_AdGeoTransform);
poDstDS->SetProjection(poSrcDS->GetProjectionRef());
 
for(int iBand=0;iBand<6;iBand++)
{
   poSrcBand=poSrcDS->GetRaserBand(iBand+1);
  poDstBand=poDstDS->GetRaserBand(iBand+1);
  float *pafScanline;
  pafScanline=(float *)CPLMalloc(sizeof(float)*nX;
  for(int i=1;i<nY;i++)
  {
     poSrcBand->RasterIO(GF_Read,0,0,nX,i,pafScanline,nX,1,GDT_Float32,0,0);
     poDstBand->RasterIO(GF_Write,0,0,nX,i,pafScanline,nX,1,GDT_Float32,0,0);
   }
}
GDALClose((GDALDatasetH)poDstDS);
 
When I run my program,CPU is very alway busy,and the program is blocked,why?
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