字节转换

BOOL CWinInternet::MByteToWChar(LPCSTR lpcszStr, LPWSTR lpwszStr, DWORD dwSize)
{
    // Get the required size of the buffer that receives the Unicode 
    // string. 
    DWORD dwMinSize;
    dwMinSize = MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, NULL, 0);

    if(dwSize < dwMinSize)
    {
        return FALSE;
    }
    // Convert headers from ASCII to Unicode.
    MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, lpwszStr, dwMinSize);  
    return TRUE;
}

BOOL CWinInternet::WCharToMByte(LPCWSTR lpcwszStr, LPSTR lpszStr, DWORD dwSize)
{
    DWORD dwMinSize;
    dwMinSize = WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,NULL,0,NULL,FALSE);
    if(dwSize < dwMinSize)
    {
        return FALSE;
    }
    WideCharToMultiByte(CP_OEMCP,NULL,lpcwszStr,-1,lpszStr,dwSize,NULL,FALSE);
    return TRUE;
}

std::wstring CWinInternet::LPSTRToWString( LPCSTR lpcszStr )
{
    std::wstring sTmp;
    DWORD dwMinSize = MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, NULL, 0);
    sTmp.resize(dwMinSize);
    MultiByteToWideChar (CP_ACP, 0, lpcszStr, -1, &sTmp[0], dwMinSize);  
    return sTmp;
}