isBinary

[Vino]

On Sunday, 3 September 2023 at 10:15:31 UTC, FeepingCreature 
wrote:
> On Sunday, 3 September 2023 at 10:11:22 UTC, Vino wrote:
>> Hi All,
>>
>>    Any update as to when the function described in the below 
>> ticked would be action-ed, I am more interested in isBinary 
>> (check a file whether is is binary file or not)
>>
>> http://d.puremagic.com/issues/show_bug.cgi?id=9455
>>
>> From,
>> Vino
>
> Those are totally different ideas.
>
> When writing a file, some operating systems support line ending 
> conversion. To do that, you explicitly specify that you are 
> writing to a text file. Then a "binary file" is just any file 
> that is not a text file. However, this is merely a conversion 
> process on writing. You cannot discover whether a file is a 
> binary file in reverse. At most you can check whether *you 
> yourself* opened the file as a binary file.

I tried to write the below code but it always return's as binary 
for any file type, please point me what is wrong in the below 
program

```
void main () {
import std.stdio: writeln, File;
string fn = "C:\\temp\\test.txt";
//string fn = "C:\\WINDOWS\\system32\\whoami.exe";
File f;
f.open(fn, "rb");
if(f.isOpen) { writeln("BinaryFile"); } else { 
writeln("NotBinaryFile"); }
f.close();
}
```
From,
Vino