Re: [PlayerStage-Gazebo] gzb file format

[Nate K. <nk...@ro...>]

Hello,

Your fread statement is incorrect. To read in the version number use
fread(&data,4,1,input).
Check the manpage for fread.

-nate

On 7/19/06, Dustin Cannon <dus...@gm...> wrote:
>
> Hi all,
>
> In the previous email I sent.  The line
> printf("version number:%s\n", data);
>
>
> should be
> printf("version number:%f\n", data);
>
> the %s was a type-o, so my problem isn't that I accidentally tried to print
> it as a string ;)
>
> -Dustin-
>
> previous message:
>
> Hi,
>
> I need to extract info from a .gzb file.  I have read the description of
> gzbuilder's output file format.  I tried doing a simple extraction of the
> version number, which to my understanding should be the first 4 bytes in the
> file.  I used code like this:
>
> gzb_extract(const char *filename) {
>
> FILE *input;
>     size_t n;
>     float data;
>
>     input = fopen(filename, "rb");
>     if (input == NULL) {
>         perror("gzb_extract(): couldn't open input file");
>         return -1;
>     }
>
>     n = fread(&data, 1, 4, input);
>     if (n != 0) {
>         data = (float) ntohl((uint32_t) data); // convert to host byte order
>         data /= 1000; // take out numerical constant
>         printf("version number: %s\n", data);
>     }
>
>     fclose(input);
> }
>
> However, the printed results don't seem to make sense.  And a hex dump of
> the gzb file doesn't seem to match what my program is showing when I print
> out those first 4 bytes in hexadecimal.
>
> If anyone can offer some insight or perhaps tell me if there is a flaw in
> the way I am trying to extract the info it would be much appreciated.
> Thanks!
>
> -Dustin-
>
>
>
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