C / C ++ I18N mbstowcs question

I am working on internationalizing input for a C / C ++ application. I am currently running into a problem converting from a multibyte string to a wide character string.

The code needs to be cross platform compatible, so I use mbstowcs and wcstombs as much as possible.

I am currently working on a WIN32 machine and I have set the locale to non-English (Japanese).

When I try to convert a multibyte character string, I seem to be having conversion problems.

Here's some sample code:

int main(int argc, char** argv)
{
    wchar_t *wcsVal = NULL;
    char *mbsVal = NULL;

     /* Get the current code page, in my case 932, runs only on windows */
     TCHAR szCodePage[10]; 
     int cch= GetLocaleInfo( 
             GetSystemDefaultLCID(), 
             LOCALE_IDEFAULTANSICODEPAGE,  
             szCodePage,  
             sizeof(szCodePage)); 

     /* verify locale is set */
     if (setlocale(LC_CTYPE, "") == 0)
     {
        fprintf(stderr, "Failed to set locale\n");
        return 1;
     }

    mbsVal = argv[1];
         /* validate multibyte string and convert to wide character */
    int size = mbstowcs(NULL, mbsVal, 0);
    if (size == -1)
    {
        printf("Invalid multibyte\n");
        return 1;
    }
    wcsVal = (wchar_t*) malloc(sizeof(wchar_t) * (size + 1));
    if (wcsVal == NULL)
    {
        printf("memory issue \n");
        return 1;
    }

    mbstowcs(wcsVal, szVal, size + 1);
    wprintf(L"%ls \n", wcsVal);         
    return 0;
}

      

        
        
        
      

    

At the end of execution, the wide character string contains no converted data. I believe there is a problem with the codepage settings because when I use MultiByteToWideChar and have the current codepage sent to

EX: MultiByteToWideChar (CP_ACP, 0, mbsVal, -1, wcsVal, size + 1); instead of calling mbstowcs, the conversion succeeds.

My question is, how do I use the generic mbstowcs call instead of the MuliByteToWideChar call?