Convert MFC CString to integer

Question

How to convert a CString object to integer in MFC

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The problem with the accepted answer is that it cannot signal failure  There s strtol  STRing TO Long  which can  It s part of a larger family  wcstol  Wide Character String TO Long  e g  Unicode   strtoull  TO Unsigned Long Long  64bits    wcstoull  strtof  TO Float  and wcstof

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The simplest approach is to use the atoi   function found in stdlib h   CString s    123   int x   atoi  s      However  this does not deal well with the case where the string does not contain a valid integer  in which case you should investigate the strtol   function   CString s    12zzz         bad integer char   p  int x   strtol   s   amp  p  10    if     p    0           s does not contain an integer

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you can also use good old sscanf    CString s  int i  int j    stscanf s   T   d     amp i   if  j    1          tranfer didn t work

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A  ttoi function can convert CString to integer  both wide char and ansi char can work  Below is the details   CString str    T  123    int i    ttoi str

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You may use the C atoi function   in a try   catch clause because the conversion isn t always possible  But there s nothing in the MFC classes to do it better

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i ve written a function that extract numbers from string   int SnirElgabsi  GetNumberFromCString CString src  CString str  int length          get startIndex    int startIndex   src Find str    CString str  GetLength          cut the string    CString toreturn   src Mid startIndex  length         convert to number    return  wtoi toreturn      atoi toreturn      Usage   CString str    T  digit 1  number 102    int  digit   GetNumberFromCString str   T  digit     1   int number   GetNumberFromCString str   T  number     3

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If you are using TCHAR H routine  implicitly  or explicitly   be sure you use  ttoi   function  so that it compiles for both Unicode and ANSI compilations   More details  https   msdn microsoft com en-us library yd5xkb5c aspx

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CString s  int i  i    wtoi s      if you use wide charater formats i    atoi s      otherwise

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CString s  143   int x atoi s     or  CString s  T  143    int x  toti s     atoi will work  if you want to convert CString to int

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The canonical solution is to use the C   Standard Library for the conversion  Depending on the desired return type  the following conversion functions are available  std  stoi  std  stol  or std  stoll  or their unsigned counterparts std  stoul  std  stoull    The implementation is fairly straight forward   int ToInt  const CString amp  str         return std  stoi    str GetString    static cast lt size t gt   str GetLength             long ToLong  const CString amp  str         return std  stol    str GetString    static cast lt size t gt   str GetLength             long long ToLongLong  const CString amp  str         return std  stoll    str GetString    static cast lt size t gt   str GetLength             unsigned long ToULong  const CString amp  str         return std  stoul    str GetString    static cast lt size t gt   str GetLength             unsigned long long ToULongLong  const CString amp  str         return std  stoull    str GetString    static cast lt size t gt   str GetLength              All of these implementations report errors through exceptions  std  invalid argument if no conversion could be performed  std  out of range if the converted value would fall out of the range of the result type   Constructing the temporary std   w string can also throw   The implementations can be used for both Unicode as well as MBCS projects

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Define in msdn  https   msdn microsoft com en-us library yd5xkb5c aspx  int atoi     const char  str     int  wtoi     const wchar t  str     int  atoi l     const char  str      locale t locale    int  wtoi l     const wchar t  str      locale t locale      CString is wchar t string  So  if you want convert Cstring to int  you can use      CString s    int test    wtoi s

[visual-c++] Convert MFC CString to integer

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