wchar_t* 与 char* 相互转换(自己写的函数)

/*
说明:    将 宽字节wchar_t* 转换 单字节char*
参数:    szStr是源字符串,pResult,为目标字符串,
        maxLen为pResult所指向的内存空间的最大长度
*/
char* UnicodeToAnsi( const wchar_t* szStr ,char *pResult ,int maxLen)
{
    if(NULL == pResult)
        return NULL;
    int nLen = WideCharToMultiByte( CP_ACP, 0, szStr, -1, NULL, 0, NULL, NULL );
    if(0 == nLen)
    {
        return NULL;
    }
    if(nLen >= maxLen)
        nLen = maxLen;
    WideCharToMultiByte( CP_ACP, 0, szStr, -1, pResult, nLen, NULL, NULL );
    return pResult;
}
/*
说明:    将 单字节char* 转换为 宽字节 wchar*
参数:    szStr是源字符串,pResult,为目标字符串,
        maxLen为pResult所指向的内存空间的最大长度
*/
wchar_t* AnsiToUnicode( const char* szStr,wchar_t *pResult ,int maxLen )
{
    if(NULL == pResult)
        return NULL;
    int nLen = MultiByteToWideChar( CP_ACP, MB_PRECOMPOSED, szStr, -1, NULL, 0 );
    if(0 == nLen)
    {
        return NULL;
    }
    //wchar_t* pResult = new wchar_t[nLen];
    if(nLen >= maxLen)
        nLen = maxLen;

    nLen = MultiByteToWideChar( CP_ACP, MB_PRECOMPOSED, szStr, -1, pResult, nLen );
    if(0 == nLen)
    {
        return NULL;
    }
    return pResult;
}