cannot convert parameter from 'PCHAR' to 'LPCWSTR'

Question

• I have defined the pointer size_Drive as :

  PCHAR size_Drive ;
  

  then i used the function lstrlen :

  size_Drive += (lstrlen(size_Drive) + 1) ;  (line 28)
  

  but it gives me the following ERROR :

  1>c:\users\hp.hp-pc\documents\visual studio 2008\projects\getvolumeinfo\getvolumeinfo\getvolumeinfo.cpp(28) : error C2664: 'lstrlenW' : cannot convert parameter 1 from 'PCHAR' to 'LPCWSTR'
  1>        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
  

Answer 1

PCHAR is a typedef for char whereas LPCWSTR is a typedef for const wchar_t*, and in a Unicode build lstrlen is a macro for the Unicode function lstrlenW.

You should call lstrlenA specifically to use the ANSI function.