How to read pixels from MNIST digit database and create the iplimage

int reverseInt(int i) 
{
    unsigned char c1, c2, c3, c4;
    c1 = i & 255;
    c2 = (i >> 8) & 255;
    c3 = (i >> 16) & 255;
    c4 = (i >> 24) & 255;
    return ((int)c1 << 24) + ((int)c2 << 16) + ((int)c3 << 8) + c4;
}

void create_image(CvSize size,int channels, unsigned char* data, int imagenumber)
{
	string imgname; ostringstream imgstrm;string fullpath;
	imgstrm << imagenumber;
	imgname=imgstrm.str();
	fullpath="D:\\"+imgname+".jpg";

	IplImage *imghead=cvCreateImageHeader(size, IPL_DEPTH_16S, channels);
	imghead->imageData=(char *)data;
	cvSaveImage(fullpath.c_str(),imghead);
	
}

int main()
{
    ifstream file ("D:\\train-images.idx3-ubyte",ios::binary);
    if (file.is_open())
    {
        int magic_number=0; int number_of_images=0;int r; int c;
        int n_rows=0; int n_cols=0;CvSize size;unsigned char temp=0;

        file.read((char*)&magic_number,sizeof(magic_number)); 
        magic_number= reverseInt(magic_number);

        file.read((char*)&number_of_images,sizeof(number_of_images));
        number_of_images= reverseInt(number_of_images);

        file.read((char*)&n_rows,sizeof(n_rows));
        n_rows= reverseInt(n_rows);
        file.read((char*)&n_cols,sizeof(n_cols));
        n_cols= reverseInt(n_cols);


        for(int i=0;i<number_of_images;++i)
        {
            for(r=0;r<n_rows;++r)
            {
                for(c=0;c<n_cols;++c)
                {                 
                    file.read((char*)&temp,sizeof(temp));
                }			
            }
			size.height=r;size.width=c;
			create_image(size,3, &temp, i);
        }
    }
	return 0;
}