Hello all,

does the write function have a return type? I've got a write statement that
isn't writing and I wanted to see if there is a way to do error checking.

Thanks

Art

student.write(reinterpret_cast<char *>(&studentInfo),sizeof(studentInfo));

Art Cummings wrote:

> does the write function have a return type?

The write function from basic_ostream returns a basic_ostream&.


> I've got a write statement
> that isn't writing and I wanted to see if there is a way to do error
> checking.

The returned reference refers to the stream and you could check the flags.


> student.write(reinterpret_cast<char *>(&studentInfo),sizeof(studentInfo));

"student" is a rather peculiar name for a stream.



Best

Kai-Uwe Bux

Art Cummings wrote:

> Hello all,
>
> does the write function have a return type?

What write function?

> I've got a write statement that isn't writing and I wanted to see if there
> is a way to do error checking.
>
> Thanks
>
> Art
>
> student.write(reinterpret_cast<char *>(&studentInfo),sizeof(studentInfo));

What type is student?

>>
>> student.write(reinterpret_cast<char
>> *>(&studentInfo),sizeof(studentInfo));
>
> What type is student?
>

student is an arrray of structures

Art

Art Cummings wrote:

>>>
>>> student.write(reinterpret_cast<char
>>> *>(&studentInfo),sizeof(studentInfo));
>>
>> What type is student?
>>
>
> student is an arrray of structures

You mean as in:

some_structure student [some_size];

In that case, the line should not compile. There would be no write() member
function.


Best

Kai-Uwe Bux

>
> In that case, the line should not compile. There would be no write()
> member
> function.
>
>
Actually it does compile and it writes to disk. The members are populated
as I loop thru the array, and then I write the array of structures to disk.

Thanks
Art

On Dec 7, 10:46 am, Kai-Uwe Bux <jkherci...@gmx.net> wrote:
> Art Cummings wrote:
> > does the write function have a return type?

> The write function from basic_ostream returns a basic_ostream&.

> > I've got a write statement
> > that isn't writing and I wanted to see if there is a way to do error
> > checking.

> The returned reference refers to the stream and you could check the flags.

> > student.write(reinterpret_cast<char *>(&studentInfo),sizeof(studentInfo));

> "student" is a rather peculiar name for a stream.

In addition to the other comments, I'd remind the OP that unless
studentInfo is an array of a character type (char or unsigned
char), ostream::write probably won't do anything useful with it.
(The reinterpret_cast makes me somewhat suspicious, but I've
formatted into arrays of unsigned char on occasion, and used
just such a reinterpret_cast to convert the unsigned char* to
char*. Except that when writing, I'd always cast to "char
const*".)

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On Dec 7, 5:40 pm, Kai-Uwe Bux <jkherci...@gmx.net> wrote:
> Art Cummings wrote:
>
> >>> student.write(reinterpret_cast<char
> >>> *>(&studentInfo),sizeof(studentInfo));
>
> >> What type is student?
>
> > student is an arrray of structures
>
> You mean as in:
>
> some_structure student [some_size];
>
> In that case, the line should not compile. There would be no write() member
> function.
>
> Best
>
> Kai-Uwe Bux

a stream can be thougt of as a sequence of records,but I think OP
should give more info.

regards,
FM.