Re: Very strange problem using FWRITE() to write data to a binary file
From: CBFalconer (cbfalconer_at_yahoo.com)
Date: 02/08/05
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Date: Tue, 08 Feb 2005 18:21:59 GMT
leonecla@yahoo.it wrote:
>
> I'm facing a very very strange problem with a very very simple C
> program...
> My goal should be to write to a binary file some numbers (integers),
> each one represented as a sequence of 32 bit.
>
> I made this stupid trial code:
>
> ---------------------------------------------
> FILE *fout;
> int w;
>
> main()
> {
> f_out = fopen("data_8bit.bin", "wb");
> if(f_out == NULL)
> /* error signaling and exit */
> else
> {
> w = 0x17070707;
> fwrite(&w, sizeof(w), 1, f_out);
> fclose(f_out);
> }
> }
> ---------------------------------------------
>
> If I execute this code (compile with Visual Studio 6) and then
> open the "data_8bit.bin" file (inside the Visual Studio), it is
> displayed as a binary file, and I can see the data "07 07 07 17".
> It is correct. Now, if in the code above I assign to w the value
> 0x07070707 (instead of 0x17070707), execute the code and open the
> "data_8bit.bin", it contains no more binary data...
> The same happens with 0x99999999, for example.
I fail to see how you can execute it - it won't even compile. If
you #include <stdio.h> and correct the name for the fout variable,
and include a return 0 at the end, and put something in for the
error branch, it works just fine.
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