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Join Date: Sep 2007
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EOF in a CFile Hi all,
I want to find the end of file in a CFile. What I've do up to now is, find the length of the file in bytes. Then do the required process with the number of bytes. Here is the code,
My question is there is any simple way to do it. I know on fstream I can do it within one statement, like this.
I want to find the end of file in a CFile. What I've do up to now is, find the length of the file in bytes. Then do the required process with the number of bytes. Here is the code,
C++ Syntax (Toggle Plain Text)
My question is there is any simple way to do it. I know on fstream I can do it within one statement, like this.
C++ Syntax (Toggle Plain Text)
“victory breeds hatred, the defeated live in pain; happily the peaceful live giving up victory and defeat” - Gautama Buddha
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even the fstream example you posted is not workable.
line 4 does not calculate the size of a file but the number of TCHARs in the file, which might or might not be the same as the size depending on the UNICODE setting.
As for CFile, the answer is NO -- and that's one reason why I hate that class. Unless the file contains serialized MFC objects you are better off using normal c++ fstreams, assuming your compiler supports it (some do not).
line 4 does not calculate the size of a file but the number of TCHARs in the file, which might or might not be the same as the size depending on the UNICODE setting.
As for CFile, the answer is NO -- and that's one reason why I hate that class. Unless the file contains serialized MFC objects you are better off using normal c++ fstreams, assuming your compiler supports it (some do not).
Last edited by Ancient Dragon : Oct 31st, 2007 at 4:49 am.
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Junior Poster
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Originally Posted by Ancient Dragon 
even the fstream example you posted is not workable.
At the time I post my code it's not workable. But now it works. What I want to do is try the same application with CFile and SQL Server. And also I want to design a GUI for it later.
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Originally Posted by Ancient Dragon
line 4 does not calculate the size of a file but the number of TCHARs in the file, which might or might not be the same as the size depending on the UNICODE setting.
Actually it works, I check the properties of the file(file which is used to read) and the number of bytes of the file is same as the value given by the above code.
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Originally Posted by Ancient Dragon
As for CFile, the answer is NO -- and that's one reason why I hate that class. Unless the file contains serialized MFC objects you are better off using normal c++ fstreams, assuming your compiler supports it (some do not).
Most of the time I found that, people don't like MFC. Few reasons I have to use it. First thing is I want to design GUI. Second thing is I'm really new for C++ and MFC, and I'm searching the easiest way to do it.
“victory breeds hatred, the defeated live in pain; happily the peaceful live giving up victory and defeat” - Gautama Buddha
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>>Actually it works
Yes it will work if you do not define UNICODE because TCHAR is defined as char and sizeof(char) is always 1. So your code reduces to srf_ReadFile.GetLength()/1, or just simply srf_ReadFile.GetLength(). Now define UNICODE and your formula will change to srf_ReadFile.GetLength()/2, which will result in 1/2 of the actual file size if you are on MS-Windows or 1/4th the file size on *nix because sizeof(TCHAR) = 2 (a short int) on MS-Windows and sizeof(TCHAR) is 4 on *nix (a long int)
>>Few reasons I have to use it. First thing is I want to design GUI
Not a reason to use CFile. Just because you have an MFC program is not a reason to use CFile either. You can mix CFile with fstreams in the same program -- I have done it hundreds of times.
Yes it will work if you do not define UNICODE because TCHAR is defined as char and sizeof(char) is always 1. So your code reduces to srf_ReadFile.GetLength()/1, or just simply srf_ReadFile.GetLength(). Now define UNICODE and your formula will change to srf_ReadFile.GetLength()/2, which will result in 1/2 of the actual file size if you are on MS-Windows or 1/4th the file size on *nix because sizeof(TCHAR) = 2 (a short int) on MS-Windows and sizeof(TCHAR) is 4 on *nix (a long int)
>>Few reasons I have to use it. First thing is I want to design GUI
Not a reason to use CFile. Just because you have an MFC program is not a reason to use CFile either. You can mix CFile with fstreams in the same program -- I have done it hundreds of times.
Last edited by Ancient Dragon : Oct 31st, 2007 at 8:58 am.
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Junior Poster
Thanks pal,
Actually I haven't use it before. If I can use fstream in an MFC application what is the point to use CFile. Any special reason to do it.
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Originally Posted by Ancient Dragon
Not a reason to use CFile. Just because you have an MFC program is not a reason to use CFile either. You can mix CFile with fstreams in the same program -- I have done it hundreds of times.
Actually I haven't use it before. If I can use fstream in an MFC application what is the point to use CFile. Any special reason to do it.
“victory breeds hatred, the defeated live in pain; happily the peaceful live giving up victory and defeat” - Gautama Buddha
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CFile is often used with CArchive to serialize MFC classes and objects. Otherwise its not a very good class for normal text file i/o.
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Junior Poster
Actually lots of people hate this MFC. But I feel it is easy to learn.
And as you say, if I can use functionalities like fstream, etc it wont be difficult at all.
And as you say, if I can use functionalities like fstream, etc it wont be difficult at all.
“victory breeds hatred, the defeated live in pain; happily the peaceful live giving up victory and defeat” - Gautama Buddha
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