Thread: LPCTSTR ends at space

I'm trying to convert STD:: basic_string<TCHAR> to LPCTSTR. It works, but the result ends at the first space in the original string.

Code:

basic_string<TCHAR> strOutput;
basic_stringstream<TCHAR>  buff;
buff << "Camera pos: ("<<camerax<<", "<<cameray<<", "<<cameraz<<")";
buff>>strOutput;
output=(LPCTSTR)strOutput.c_str();

I know the conversion works because I output="Camera". If I replace all the spaces with underscores then the entire thing works. I suppose that's acceptable, but is there any way to get the spaces?

(or a better way to convert? I still need to be able to add string versions of my variables easily, like with the stringStream above, which automatically converts my floats to strings)


Note: the reason I'm doing this is so I can send output to the directx LPD3DXFONT->DrawText() function. Is it possible that this function just doesn't like spaces?

First, a review of TCHAR's - LPCTSTR operations/ convertion

I don't recommend TCHAR's, but just to correct the above code:
You have to use the TEXT("") macro for TCHAR string literals. This will put the necessary "L" in front of the literal in case TCHAR resolves to wchar_t.

>> output=(LPCTSTR)strOutput.c_str();
c_str() already returns the correct type - you shouldn't have to cast it.

Consider doing to your work with either char or wchar_t strings and just call the "A" or "W" directx functions.

gg

Originally Posted by Codeplug

First, a review of TCHAR's - LPCTSTR operations/ convertion

I don't recommend TCHAR's, but just to correct the above code:
You have to use the TEXT("") macro for TCHAR string literals. This will put the necessary "L" in front of the literal in case TCHAR resolves to wchar_t.

>> output=(LPCTSTR)strOutput.c_str();
c_str() already returns the correct type - you shouldn't have to cast it.

Consider doing to your work with either char or wchar_t strings and just call the "A" or "W" directx functions.

gg

He was getting confused with the Microsoft CString class where such a thing works

No need for the LPCSTR conversions.

Input streaming operations (like buff>>strOutput) stop at the first whitespace by default unless end of stream is reached first.

basic_stringstream has a method named str() which returns a string object that contains a copy of the stream buffer. So try strOutput = buff.str();