mbsinit

Suit l’état d’une conversion en caractères multioctets.

Syntaxe

int mbsinit(
   const mbstate_t* ps
);

Paramètres

ps
Pointeur vers une mbstate_t variable.

Valeur retournée

Différent de zéro si ps c’est ou s’il n’est NULL pas au milieu d’une conversion.

Notes

Lorsque vous utilisez l’une des fonctions ANSI qui accepte un mbstate_t pointeur, la transmission de l’adresse de vos mbstate_t informations retourne des informations sur la conversion du dernier octet dans la mémoire tampon.

La page de codes appropriée doit être installée pour prendre en charge vos caractères multioctets.

Exemple

// crt_mbsinit.cpp
#include <stdio.h>
#include <mbctype.h>
#include <string.h>
#include <locale.h>
#include <cwchar>
#include <xlocinfo.h>

#define   BUF_SIZE   0x40

wchar_t      g_wcBuf[BUF_SIZE] = L"This a wc buffer that will be over written...";
char      g_mbBuf[BUF_SIZE] = "AaBbCc\x9A\x8B\xE0\xEF\xF0xXyYzZ";
int      g_nInit = strlen(g_mbBuf);

int MbsinitSample(char* szIn, wchar_t* wcOut, int nMax)
{
   mbstate_t   state = {0};
   size_t      nConvResult, nmbLen = 0, nwcLen = 0;
   wchar_t*   wcCur = wcOut;
   wchar_t*   wcEnd = wcCur + nMax;
   const char*   mbCur = szIn;
   const char*   mbEnd = mbCur + strlen(mbCur) + 1;
   char*      szLocal = setlocale(LC_ALL, "japanese");

   printf("Locale set to: \"%s\"\n", szLocal);

   if   (_setmbcp(_MB_CP_LOCALE) != -1)
   {
      while   ((mbCur < mbEnd) && (wcCur < wcEnd))
      {
         nConvResult = mbrtowc(wcCur, mbCur, 1, &state);

         switch   (nConvResult)
         {
            case 0:
            {   // done
               printf("Conversion succeeded!\nMB String: ");
               printf(szIn);
               printf("\nWC String: ");
               wprintf(wcOut);
               printf("\n");
               mbCur = mbEnd;
               break;
            }

            case -1:
            {   // encoding error
               printf("ERROR: The call to mbrtowc has detected an encoding error.\n");
               mbCur = mbEnd;
               break;
            }

            case -2:
            {   // incomplete character
               if   (!mbsinit(&state))
               {
                  printf("Currently in middle of mb conversion, state = %x\n", state);
                  // state will contain data regarding lead byte of mb character
               }

               ++nmbLen;
               ++mbCur;
               break;
            }

            default:
            {
               if   (nConvResult > 2)   // Microsoft mb should never be larger than 2
                  printf("ERROR: nConvResult = %d\n", nConvResult);

               ++nmbLen;
               ++nwcLen;
               ++wcCur;
               ++mbCur;
               break;
            }
         }
      }
   }
   else
      printf("ERROR: _setmbcp(932) failed!");

   return 0;
}

int main(int argc, char* argv[])
{
   return MbsinitSample(g_mbBuf, g_wcBuf, BUF_SIZE);
}

Exemple de sortie

Locale set to: "Japanese_Japan.932"
Currently in middle of mb conversion, state = 9a
Currently in middle of mb conversion, state = e0
Currently in middle of mb conversion, state = f0
Conversion succeeded!
MB String: AaBbCcxXyYzZ
WC String: AaBbCcxXyYzZ

Voir aussi

Classification d’octets