Reading binary files

FROM : Peter Schols
DATE : Fri Oct 15 18:21:56 2004

Hi,

I'm trying to read the header of a shape (.shp) file (containing 
geographical information). This works as expected for reading an 
integer, but it does not work for reading a double. The data is in 
little endian format. Any ideas what's going on here?

The .shp file is available upon request.

Thanks!

Peter

Peter Schols
Laboratory of Plant Systematics - K.U.Leuven
Belgium

---

- (IBAction)read:(id)sender;
{
    NSFileHandle *file;
    int type;
    double number;

    file = [NSFileHandle 
fileHandleForReadingAtPath:@"/Users/mac/Desktop/st12_d00_shp/
st12_d00.shp"];
    [file readDataOfLength:32];

    [[file readDataOfLength:4] getBytes:&type];
    type = NSSwapLittleLongToHost(type);
    NSLog(@"Type: %d", type);  // The type is correctly reported as 
being 5

    [[file readDataOfLength:8] getBytes:&number];
    number = NSSwapLittleLongToHost(number);
    NSLog(@"Number: %lf", number);  // The Number is reported as being 
0.00000 which is not the case
}