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C++ Discussion Thread
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Oct 21st, 2007

File read problem

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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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pri_skit

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Oct 21st, 2007

Re: File read problem

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.

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

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

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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Oct 21st, 2007

Re: File read problem

Use >> operator rather.

ithelp

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Oct 21st, 2007

Re: File read problem

Click to Expand / Collapse Quote originally posted by ithelp ...

Use >> operator rather.

CFile doesn't support that, which is one reason I hate that class.

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Re: File read problem

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

CFile doesn't support that, which is one reason I hate that class.

Thanks for your help.

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