[Gdal-dev] GDALRasterIO

[Frank Warmerdam]

salah jubeh wrote:
> Hi guys
>  
> I would like dump the content of image into an array to do some 
> processing; I was able to extract rows
>  
> But I want to extract the whole image band  how this can be done
>  
> I used this code
>  
> nXSize = GDALGetRasterBandXSize( hBand );
> nYSize = GDALGetRasterBandYSize( hBand );
>  
> pafScan = (float *) CPLMalloc(sizeof(float)*nXSize*nYSize);
>         GDALRasterIO( hBand, GF_Read, 0, 0, nXSize, nYSize,
>                       pafScan, nXSize,nYSize,GDT_Float32,
>                       0, 0 );
> But still when I say pafScan[10,10] it give me the value of 10^th pixel 
> in the first row

Salah,

How was pafScan declared?  If it is simply "float *pafScan;" then it
is a 1D array and you would need to do the 2d to 1d conversion yourself.

eg.

read pafScan[10 + 10 * nXSize]

The code itself looks fine for reading the whole band at once.

Best regards,
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