C++博客-My Note-随笔分类-Tools

1 class String : public std::wstring
2 {
3 public:
4 void Format(const wchar_t* pszFormat,

);
5 protected:
6     void FormatV(const wchar_t* pszFormat, va_list args);
7     int GetFormattedLength(const wchar_t* pszFormat, va_list args);
8     int Format(wchar_t* pszBuffer, ULONG nLength, const wchar_t* pszFormat, va_list args);
9 };

std::wstring StrFormat( const wchar_t* pstrFormat,

)
{
    WCHAR szBuffer[300] = { 0 };
    va_list args;
    va_start(args, pstrFormat);
    ::wvnsprintf(szBuffer, lengthof(szBuffer) - 2, pstrFormat, args);
    wcscat_s(szBuffer, 300, L"\n");
    va_end(args);
    return szBuffer;
}

void String::Format( const wchar_t* pszFormat,

)
{
    va_list arglist;
    va_start(arglist, pszFormat);
    FormatV(pszFormat, arglist);
    va_end(arglist);
}

int String::Format( wchar_t* pszBuffer, ULONG nLength, const wchar_t* pszFormat, va_list args )
{
    return vswprintf_s(pszBuffer, nLength, pszFormat, args);
}

void String::FormatV( const wchar_t* pszFormat, va_list args )
{
    if (pszFormat == NULL)
    {
        return;
    }
    ULONG nLength = GetFormattedLength(pszFormat, args);
    wchar_t* pszBuffer = new wchar_t[nLength + 1];
    ::ZeroMemory(pszBuffer, nLength + 1);
    Format(pszBuffer, nLength + 1, pszFormat, args);
    std::wstring::operator=(std::wstring(pszBuffer));
    delete []pszBuffer;
}

int String::GetFormattedLength( const wchar_t* pszFormat, va_list args )
{
    return _vscwprintf(pszFormat, args);
}