FIX: Print Preview Problems for Chars with ASCII Values > 127

MORE INFORMATION

The function CPreviewDC::ComputeDeltas(,) located in the source file DCPREV.CPP, declares and uses two variables called lpszCurChar and lpszStartRun. These two variables are declared as being of type LPCSTR (in other words, 32-bit pointers to a const signed char). To avoid the problem of the pointers referring the ::GetCharWidth() function to passing characters, declare the variables lpszCurChar and lpszStartRun as being 32-bit pointers to const unsigned chars. With versions 2.0 and 2.5 of the MFC library supplied with Visual C++ for Windows, versions 1.0 and 1.5, this can be done when you define a new type called "LPCTSTR" with the following typedef:

   typedef const unsigned char FAR * LPCTSTR;
				

Place the definition of the LPCSTR type in the file DCPREV.CPP at global scope before the definition of the function "CPreviewDC::ComputeDeltas()". The LPCTSTR type is already defined in the 32-bit version of the MFC library (supplied with Visual C++ for Windows NT, version 1.0) and does not need to be defined in DCPREV.CPP with that version of the MFC library.

The variables lpszCurChar and lpszStartRun should be declared as being of type LPCTSTR. To do this, make the changes listed below:

1. In the file DCPREV.CPP supplied with Visual C++ for Windows, versions 1.0 and 1.5, change lines 457 and 458 to read as follows:

         LPCTSTR lpszCurChar = (LPCTSTR)lpszString;
         LPCTSTR lpszStartRun = (LPCTSTR)lpszString;
   						

2. Change lines 489 and 490 to read as follows:

         CSize sizeExtent = ::GetTextExtent(m_hAttribDC,(LPCSTR)lpszStartRun,
             nRunLength);
   						

3. In the file DCPREV.CPP, supplied with Visual C++ for Windows NT, version 1.0, change lines 466 and 467 to read as follows:

         LPCTSTR lpszCurChar = lpszString;
         LPCTSTR lpszStartRun = lpszString;
   						

4. After following steps 1 through 3, rebuild the MFC library. For more information on rebuilding the MFC library, refer to the Class Library User's Guide or to the README.TXT file located in the MFC\SRC directory.