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File read problem

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Join Date: Dec 2006

Posts: 18

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pri_skit

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File read problem

Oct 21st, 2007

I have written a CString Object into Text file by using :
f.Write (&FileName,FileName.GetLength());//FileName is CString Object
Now I want to Read CString object back How this could be done?I am using code :
LPTSTR p = CurrentLanguageName.GetBuffer(11);
void *g=(void *)p;
f.Read (g,CurrentLanguageFileLen);
CurrentLanguageName.ReleaseBuffer( );
//But this method don't work.
Regards,

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Join Date: Aug 2005

Posts: 15,142

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Ancient Dragon Ancient Dragon is offline

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Re: File read problem

Oct 21st, 2007

you wrote it wrong -- what you wrote is the c++ class object, not the string contents. If the file is a normal text file where '\n' is line terminator then you need to tack on the '\n' to the end of the string then write only the string to the file.

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
FileName += "\n";
f.write(FileName.GetBuffer(), FileName.GetLength());
FileName += "\n";
f.write(FileName.GetBuffer(), FileName.GetLength());

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
FileName += "\n";
f.write((LPCTSTR)FileName, FileName.GetLength());
FileName += "\n";
f.write((LPCTSTR)FileName, FileName.GetLength());

Then I would use a C character array to read it back into memory and assign the CString object to it

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
char buffer;
while( f.read(&buffer, 1) == 1 && buffer != '\n')
   FileName += buffer;
char buffer;
while( f.read(&buffer, 1) == 1 && buffer != '\n')
   FileName += buffer;

Personally I hate the CFile class -- it is really crude and difficult to work with text files. A better solution is to use either standard c++ fstream if it is available with your compiler (and some compilers do not support it) or use CArchive in conjunction with CFile. CArchive will make the above code quite a bit easier and cleaner.

Last edited by Ancient Dragon; Oct 21st, 2007 at 6:57 am.

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