what is the problem with the getline / file?

[kathy]

I try to read my data file line by line by using the following code:

std::fstream inFile( "data.txt", std::ios::in );
std::string line;

while ( std::getline(inFile, line) != NULL )
{
//some lines show ???.
}

Problem is I can not read some lines. I got ???. My file is txt file.I
use notepad to change some data and it works fine.

What is the problem? I guess some character is not show up in the
notepad but it have some effect on getline. Or may be it it UNICODE or
ASC II code mess up?

[Victor Bazarov]

kathy wrote:

I try to read my data file line by line by using the following code:

std::fstream inFile( "data.txt", std::ios::in );
std::string line;

while ( std::getline(inFile, line) != NULL )
{
//some lines show ???.
}

Problem is I can not read some lines. I got ???. My file is txt file.I
use notepad to change some data and it works fine.

What is the problem? I guess some character is not show up in the
notepad but it have some effect on getline. Or may be it it UNICODE or
ASC II code mess up?

Take a look at your file in a hex editor. In ASCII all codes should be
below 0x7f, IIRC. If you know that your file is double-byte, you might
want to look at wchar_t-based streams and std::wstring. I am no expert
on those either, so see if somebody else chimes in as well.

V
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[kathy]

the file is not generated by myself.

I guess it might be some ASCII code and some UNICODE. What kind of hex
editor available?

[Victor Bazarov]

kathy wrote:

the file is not generated by myself.

I guess it might be some ASCII code and some UNICODE. What kind of hex
editor available?

I dunno. Ask in a newsgroup for your OS. Or google for it.

V
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[Jim Langston]

"kathy" <yq*****@yahoo.com> wrote in message
news:11*********************@v46g2000cwv.googlegro ups.com...

the file is not generated by myself.

I guess it might be some ASCII code and some UNICODE. What kind of hex
editor available?

Try googleing for "hexedit" and your os.
There is a program called Hexedit for the mac and one for windows, not sure
if there is one for linux.