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Help with CFile

Posted on 1998-08-04
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Last Modified: 2013-11-19
As I am new in C++ I would like to write the folowing code using the CFile class
while(!feof(fp)){
   do something
  }
Also is there an equivalent to
if(ferror(fp))
Thanks
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Question by:vardis
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Author Comment

by:vardis
ID: 1320196
Edited text of question
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danny_pav earned 50 total points
ID: 1320197
1.  You can use the member m_hFile which is a file handle and do all the work with that.

-- or --

2.  You can read until end of file
char buf[100];
UINT u_bytes_read = pFile->Read(buf, sizeof(buf));
if (u_bytes_read != sizeof(buf)) {
//end of file encountered
}

Use GetStatus to check for errors

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Author Comment

by:vardis
ID: 1320198
thank you for your reply
Can you give me an example of how to use the member m_hFile
thanks
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Expert Comment

by:danny_pav
ID: 1320199
you use the functions ReadFile and WriteFile on the handle, BUT
you would probably want to use the CFile::ReadFile and CFile::WriteFile which are generally wrappers for these functions but will maintain the state of the object as well.  Using the m_hFile is a way around the class when in fact what you want to do is probably supported already.

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Expert Comment

by:danny_pav
ID: 1320200
also, as far as ferror is concerned, you can use GetLastError(); and the CFile class will throw exceptions, so you can use a try/catch block.
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Author Comment

by:vardis
ID: 1320201
Thank you danny_pav this answers my question.

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