Thread: Convert from CTimeSpan to Char?

To my limited knowledge, a message box only takes C strings. You can use a stringstream to convert a non-string value into a std::string object like so:

Code:

template <class T>
string make_string(T& data)
{
    stringstream ss;

    ss<< data;

    return ss.str();
}

Then simply call MessageBox with the c_str() member function of the string class:

Code:

MessageBox(NULL, TEXT(make_string(value).c_str()), TEXT("FOO"), MB_OK);

Lookup the CTimeSpan::Format member.

This will return a CString object that can be used in any MessageBox wrapper for MFC

ala

Code:

	CTime TimeThen,TimeNow;
	TimeThen = CTime::GetCurrentTime();
	::Sleep(10000);
	TimeNow = CTime::GetCurrentTime();
	CTimeSpan TimeSpan = TimeNow - TimeThen;
	CString TimeStr = TimeSpan.Format(_T("Number of Seconds: %S"));
	MessageBox(TimeStr);

Also, beware

Code:

TEXT(make_string(value).c_str())

The TEXT macro only works for string literals

Code:

__TEXT(quote) L##quote

If you want your code to be UNICODE safe, use a CString for MFC, or some preprocessor work to define between std::string or std::wstring

At a guess I would say that RsITEM doesnt return a string in the same format as the parameters for the construtor of CTime....

Look on MSDN and see if the formats are different

Hmm...in that case I'm not sure how it's even compiling! _variant_t has an operator _bstr_t( ) which is converting it to a CString......but CTime doesnt seem to take a string as a construtor....

I'll have a look at this when I'm at home...