I want to convert std string into a const wchar t

Question

Is there any method  My computer is AMD64     std  string str  BOOL loadU const wchar t  lpszPathName  int flag   0     When I used    loadU  amp str     the VS2005 compiler says   Error 7 error C2664   cannot convert parameter 1 from  std  string    w64   to  const wchar t      How can I do it

User · Accepted Answer

If you have a std  wstring object  you can call c str   on it to get a wchar t    std  wstring name  L Steve Nash     const wchar t  szName   name c str      Since you are operating on a narrow string  however  you would first need to widen it   There are various options here  one is to use Windows  built-in MultiByteToWideChar routine   That will give you an LPWSTR  which is equivalent to wchar t

User · Answer

You can use the ATL text conversion macros to convert a narrow  char  string to a wide  wchar t  one   For example  to convert a std  string    include  lt atlconv h gt      std  string str    Hello  world    CA2W pszWide str c str     loadU pszWide     You can also specify a code page  so if your std  string contains UTF-8 chars you can use   CA2W pszWide str c str    CP UTF8     Very useful but Windows only

User · Answer

You can use the ATL text conversion macros to convert a narrow  char  string to a wide  wchar t  one   For example  to convert a std  string    include  lt atlconv h gt      std  string str    Hello  world    CA2W pszWide str c str     loadU pszWide     You can also specify a code page  so if your std  string contains UTF-8 chars you can use   CA2W pszWide str c str    CP UTF8     Very useful but Windows only

User · Answer

First convert it to std  wstring   std  wstring widestr   std  wstring str begin    str end       Then get the C string   const wchar t  widecstr   widestr c str      This only works for ASCII strings  but it will not work if the underlying string is UTF-8 encoded  Using a conversion routine like MultiByteToWideChar   ensures that this scenario is handled properly

User · Answer

First convert it to std  wstring   std  wstring widestr   std  wstring str begin    str end       Then get the C string   const wchar t  widecstr   widestr c str      This only works for ASCII strings  but it will not work if the underlying string is UTF-8 encoded  Using a conversion routine like MultiByteToWideChar   ensures that this scenario is handled properly

User · Answer

You can use the ATL text conversion macros to convert a narrow  char  string to a wide  wchar t  one   For example  to convert a std  string    include  lt atlconv h gt      std  string str    Hello  world    CA2W pszWide str c str     loadU pszWide     You can also specify a code page  so if your std  string contains UTF-8 chars you can use   CA2W pszWide str c str    CP UTF8     Very useful but Windows only

User · Answer

If you are on Linux Unix have a look at mbstowcs   and wcstombs   defined in GNU C  from ISO C 90     mbs stand for  Multi Bytes String  and is basically the usual zero terminated C string  wcs stand for Wide Char String and is an array of wchar t    For more background details on wide chars have a look at glibc documentation here

User · Answer

First convert it to std  wstring   std  wstring widestr   std  wstring str begin    str end       Then get the C string   const wchar t  widecstr   widestr c str      This only works for ASCII strings  but it will not work if the underlying string is UTF-8 encoded  Using a conversion routine like MultiByteToWideChar   ensures that this scenario is handled properly

User · Answer

You can use the ATL text conversion macros to convert a narrow  char  string to a wide  wchar t  one   For example  to convert a std  string    include  lt atlconv h gt      std  string str    Hello  world    CA2W pszWide str c str     loadU pszWide     You can also specify a code page  so if your std  string contains UTF-8 chars you can use   CA2W pszWide str c str    CP UTF8     Very useful but Windows only

User · Answer

First convert it to std  wstring   std  wstring widestr   std  wstring str begin    str end       Then get the C string   const wchar t  widecstr   widestr c str      This only works for ASCII strings  but it will not work if the underlying string is UTF-8 encoded  Using a conversion routine like MultiByteToWideChar   ensures that this scenario is handled properly

User · Answer

If you are on Linux Unix have a look at mbstowcs   and wcstombs   defined in GNU C  from ISO C 90     mbs stand for  Multi Bytes String  and is basically the usual zero terminated C string  wcs stand for Wide Char String and is an array of wchar t    For more background details on wide chars have a look at glibc documentation here

[c++] I want to convert std::string into a const wchar_t *

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