[FWTools] Error when reading data from an image

[Aurora Sánchez Fernández]

Hi,

First of all, thanks to everyone who is there helping solving the problems we have.. 

I'm quite new using GDAL and just realized that when I'm reading the data of an image, all I get are nulls.. This is the code I'm using:

    float* rasterData;
    nXSize = GDALGetRasterBandXSize( hBand );

    rasterData = (float *) CPLMalloc(sizeof(float)*nXSize/2);
    GDALRasterIO(hBand, GF_Read, 0,0,nXSize,1,rasterData,nXSize,1,GDT_Float32, 0, 0 );

I got it from an example and thought that everything was working on well.. I have tried with different data types, not only float, but I always get zeros in all positions of rasterData. The image I'm reading is a TIFF image. Any one has an idea of what is happening??

Thank you very much!

Aurora.



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