linux 下 Linux 下char轉換為wchar_t

標籤：

LInux下使用mbstowcs函數可以將char轉化為wchar_t
函數含義：convert a multibyte string to a wide char string
說明：       The behaviour of mbstowcs depends on the LC_CTYPE category of the current locale
傳回值：   The  mbstowcs() function returns the number of wide characters that make up the converted part of the wide-char-acter string, not including the terminating null wide character.  If an invalid multibyte sequence  was  encountered, (size_t) -1 is returned.

 

 1 #include <string.h> 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <wchar.h> 5 #include <locale.h> 6 #include <iostream> 7 using namespace std;10 // 將char類型轉化為wchar13 // locale: 環境變數的值，mbstowcs依賴此值來判斷src的編碼方式
11 int ToWchar(char* &src, wchar_t* &dest, const char *locale = "zh_CN.utf8"){18   if (src == NULL) {19     dest = NULL;20     return 0;21   }23   //根據環境變數設定locale24   setlocale(LC_CTYPE, locale);26   //得到轉化為需要的寬字元大小27   int w_size = mbstowcs(NULL, src, 0) + 1;29   //w_size=0說明mbstowcs傳回值為-1。即在運行過程中遇到了非法字元(很有可能使locale沒有設定正確)31   if (w_size == 0) {32     dest = NULL;33     return -1;34   }36   wcout << "w_size" << w_size << endl;37   dest = new wchar_t[w_size];38   if (!dest) return -1;42   int ret = mbstowcs(dest, src, strlen(src)+1);43   if (ret <= 0)return -1;46   return 0;47 }49 int main(){51   char* str = "中國123";52   wchar_t *w_str ;53   ToWchar(str,w_str);54   wcout << w_str[0] << "--" << w_str[1] << "--" << w_str[2];55   delete(w_str);56   return 0;57 }

 

 

 1 #include <stdio.h>   2    3 int main(void){   5        int       i_number, result;   6        float     f_number;   7        char      c_number, str[81];   8        wchar_t   wc_str, ws_str[81];  10        printf( "\n\nEnter an int, a float, two chars and two strings\n");  12        result = scanf( "%d %f %c %C %s %S", 
                              &i_number, &f_number, &c_number, &wc_str, str, ws_str );  13        printf( "\nThe number of fields input is %d\n", 
                               result );  14        printf( "The contents are: %d %f %c %C %s %S\n",
                              i_number, f_number, c_number, wc_str, str, ws_str);  16        wprintf( L"\n\nEnter an int, a float, two chars and two strings\n");  18        result = wscanf( L"%d %f %hc %lc %S %ls", 
                              &i_number, &f_number, &c_number, &wc_str, str, ws_str );  19        wprintf( L"\nThe number of fields input is %d\n", 
                               result );  20        wprintf( L"The contents are: %d %f %C %c %hs %s\n",
                               i_number, f_number, c_number, wc_str, str, ws_str);  21 }  

 

linux 下 Linux 下char轉換為wchar_t