鍍金池/ 教程/ C/ mbstowcs() - C語言庫函數(shù)
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mbstowcs() - C語言庫函數(shù)

C庫函數(shù) size_t mbstowcs(schar_t *pwcs, const char *str, size_t n) 多字節(jié)字符字符串所指向參數(shù)str ,由pwcs指向的數(shù)組轉(zhuǎn)換。

聲明

以下是 mbstowcs() 函數(shù)的聲明。

size_t mbstowcs(schar_t *pwcs, const char *str, size_t n)

參數(shù)

  • pwcs -- 這就是指針到一個(gè)數(shù)組中的wchar_t的元素足夠長存儲(chǔ)寬字符串的最大字符長。

  • str -- 這是C多字節(jié)字符串來解釋。

  • n -- 這是wchar_t 字符的最大數(shù)目將被解釋。

返回值

這個(gè)函數(shù)返回翻譯的字符數(shù),不包括結(jié)束空字符。如果遇到無效的多字節(jié)字符,返回-1值。

例子

下面的例子演示了如何使用mbstowcs() 函數(shù)。

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

int main()
{
   int len;
   char *pmbnull  = NULL;
   char *pmb = (char *)malloc( MB_CUR_MAX );
   wchar_t *pwc = L"Hi";
   wchar_t *pwcs = (wchar_t *)malloc( sizeof( wchar_t ));

   printf("Converting to multibyte string
");
   len = wcstombs( pmb, pwc, MB_CUR_MAX);
   printf("Characters converted %d
", len);
   printf("Hex value of first multibyte character: %#.4x
", pmb);
   
   printf("Converting back to Wide-Character string
");
   len = mbstowcs( pwcs, pmb, MB_CUR_MAX);
   printf("Characters converted %d
", len);
   printf("Hex value of first wide character %#.4x

", pwcs);
   
   return(0);
}

讓我們編譯和運(yùn)行上面的程序,這將產(chǎn)生以下結(jié)果:

Converting to multibyte string
Characters converted 1
Hex value of first multibyte character: 0x19a60010
Converting back to Wide-Character string
Characters converted 1
Hex value of first wide character 0x19a60030