宽字符至多字符的相互转换方法

最新推荐文章于 2024-06-18 23:36:33 发布

newger_66

最新推荐文章于 2024-06-18 23:36:33 发布

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文章标签： character null string buffer output include

本文链接：https://blog.youkuaiyun.com/newger_66/article/details/5154058

本文提供了两个实用函数：一个用于将Unicode宽字符转换为ASCII字符，另一个用于将ASCII字符转换为Unicode宽字符。通过示例代码详细展示了如何使用Windows API中的WideCharToMultiByte和MultiByteToWideChar函数实现这两种转换。

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1. unicode宽字符至多字符的转换

char *w2c(char *pcstr,const wchar_t *pwstr, size_t len)
{
    int nLength=wcslen(pwstr);

    //获取转换后的长度
    int nBytes = WideCharToMultiByte( // Bytes required for "hello" is 5, does not include null terminator
        0, // Specify the code page used to perform the conversion
        0,         // No special flags to handle unmapped characters
        pwstr,   // Wide character string to convert
        nLength,   // The number of wide characters in that string
        NULL,      // No output buffer given, we just want to know how long it needs to be
        0,
        NULL,      // No replacement character given
        NULL );

    // make sure the buffer is big enough for this, making it larger if necessary
    if(nBytes>len)nBytes=len;

    // 通过以上得到的结果，转换unicode 字符为ascii 字符
    WideCharToMultiByte( // Writes 5 bytes "hello", does not write a null terminator after that
        0, // Specify the code page used to perform the conversion
        0,         // No special flags to handle unmapped characters
        pwstr,   // Wide character string to convert
        nLength,   // The number of wide characters in that string
        pcstr, // Put the output ASCII characters at the end of the buffer
        nBytes,                           // There is at least this much space there
        NULL,      // No replacement character given
        NULL );

    return pcstr ;
}

2. 把asii字符转换为unicode字符，和上面相同的原理
void c2w(wchar_t *pwstr,size_t len,const char *str)

{
if(str)
    {
      size_t nu = strlen(str);
      size_t n =(size_t)MultiByteToWideChar(CP_ACP,0,(const char *)str,(int)nu,NULL,0);
      if(n>=len)n=len-1;
      MultiByteToWideChar(CP_ACP,0,(const char *)str,(int)nu,pwstr,(int)n);
pwstr[n]=0;
    }

}