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

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

User · Answer

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

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

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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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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

[c++] Convert char * to LPWSTR

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