Convert char to LPWSTR

Question

I am trying to convert a program for multibyte character to Unicode   I have gone through the program and preceded the string literals with L so they look like L string    This has worked but I am now left with a C style string that won t conform  I have tried the L and putting it in TEXT   but the L gets added to the variable name -- not the string -- if I use TEXT     I have tried making it a TCHAR but then it complains that it cannot convert a TCHAR to a char      What options am I left with   I know C and C   are different  It is an old in-house C library that has been used in C   projects for several years now

User · Answer

This version  using the Windows API function MultiByteToWideChar    handles the memory allocation for arbitrarily long input strings   int lenA   lstrlenA input   int lenW     MultiByteToWideChar CP ACP  0  input  lenA  NULL  0   if  lenW gt 0        output   new wchar t lenW         MultiByteToWideChar CP ACP  0  input  lenA  output  lenW

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The std  mbstowcs function is what you are looking for    char text      something    wchar t wtext 20    mbstowcs wtext  text  strlen text  1    Plus null  LPWSTR ptr   wtext    for strings    string text    something    wchar t wtext 20    mbstowcs wtext  text c str    text length      includes null  LPWSTR ptr   wtext    --  ED  The  L  prefix only works on string literals  not variables   lt --

User · Answer

You may use CString  CStringA  CStringW to do automatic conversions and convert between these types  Further  you may also use CStrBuf  CStrBufA  CStrBufW to get RAII pattern modifiable strings

User · Answer

I m using the following in VC   and it works like a charm for me   CA2CT charText

User · Answer

The clean way to use mbstowcs is to call it twice to find the length of the result     const char   cs    lt your input char  gt    size t wn   mbsrtowcs NULL   amp cs  0  NULL         error if wn    size t -1     wchar t   buf   new wchar t wn   1         value-initialize to 0  see below     wn   mbsrtowcs buf   amp cs  wn   1  NULL         error if wn    size t -1     assert cs    NULL      successful conversion       result now in buf  return e g  as std  wstring    delete   buf    Don t forget to call setlocale LC CTYPE       at the beginning of your program   The advantage over the Windows MultiByteToWideChar is that this is entirely standard C  although on Windows you might prefer the Windows API function anyway   I usually wrap this method  along with the opposite one  in two conversion functions string- wstring and wstring- string  If you also add trivial overloads string- string and wstring- wstring  you can easily write code that compiles with the Winapi TCHAR typedef in any setting    Edit   I added zero-initialization to buf  in case you plan to use the C array directly  I would usually return the result as std  wstring buf  wn   though  but do beware if you plan on using C-style null-terminated arrays      In a multithreaded environment you should pass a thread-local conversion state to the function as its final  currently invisible  parameter   Here is a small rant of mine on this topic

[c++] Convert char * to LPWSTR

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