CODEWITHSUNDEEP
c++type-conversion
user2254511
user2254511

Reputation: 123

C++ MFC double to CString

Sorry for my English.

I need to convert double value to CString, because i need to do AfxMessageBox(double_value);

I find this:

std::ostringstream ost;
ost << double_value;
std::cout << "As string: " << ost.str() << std::endl;
//AfxMessageBox(ost.str()); - Does not work.

How i can do this?

Upvotes: 4

Views: 27312

Answers (3)

Totonga
Totonga

Reputation: 4366

Depending on your Unicode settings you need

std::ostringstream ost;
ost << std::setprecision(2) << double_value;
std::cout << "As string: " << ost.str() << std::endl;
AfxMessageBox(ost.str().c_str());

or

std::wostringstream ost;
ost << std::setprecision(2) << double_value;
std::wcout << L"As string: " << ost.str() << std::endl;
AfxMessageBox(ost.str().c_str());

This is needed because CString has a constructor for const char* or const wchar_t*. There is no constructor for std::string or std::wstring. You can also use the CString.Format which has the same not typesave problems like sprintf.

Be aware that double conversion is locale dependent. Decimal seperator will depend on your location.

Upvotes: 0

trojanfoe
trojanfoe

Reputation: 122391

AfxMessageBox expects a CString object, so format the double into a CString and pass that:

CString str;
str.Format("As string: %g", double);
AfxMessageBox(str);

Edit: If you want the value displayed as an integer (no value after decimal point) then use this instead:

str.Format("As string: %d", (int)double);

Upvotes: 14

zmbq
zmbq

Reputation: 39023

That's because ost.str() is not a CString, but rather a C++ string object. You need to convert that to CString: new CString(ost.str()).

Upvotes: 0

Related Questions