CString Vs std::string

[Anonymous]

With CString, we can perform an operation something like:

CString strMarks;
strMarks.Format("I got %d marks",marks);

Can we perform similar operation using std::string ??? If yes, then how ???

[Nitron]

Try this:

char buffer\[200\] = {0};	
std::string str = "";
int i = 9;
sprintf(buffer, "\\n\\nThis is number: %d\\n\\n", i);
str = buffer;
printf(str.c\_str());

- Nitron

---

"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb

[Roman Fadeyev]

Unfortunately, you can't. In concept of C++ std library you must use streams (like as stdout, stdin and etc). This method was perfectly described by Alexandrescu in his book "Modern C++...". But personally I like to use old good method as Format. And I have invented my own function. May be it will be useful for you

string_smart Format(cstr szText,...)
{
cstr szPtr=szText;
size_t lLen;
//Calculating Average length
for (lLen=0;*szPtr; ++szPtr,(*szPtr=='%') ?lLen+=10:lLen++);

string\_cstr strRes(++lLen);

va\_list marker;
va\_start( marker, szText);     

while (\_vsnprintf(strRes.buffer(),strRes.buffer\_size()-1,szText,marker) <0 ) 
	strRes.reserve(strRes.buffer\_size()\*2);

//\_ASSERTE( \_CrtCheckMemory( ));
strRes.buffer()\[strRes.buffer\_size()-1\]='\\0';	//Don't remove this line!
strRes.recalc\_len();						
								

va\_end( marker );              

return strRes;

}

This function works with my class string_smart, but it is not hard to remake it for std::string

[Michael Dunn]

Yes you can, using the stringstream class:

#include <string>
#include <sstream>

ostringstream strm;
string strMarks;

strm << "I got " << marks << " marks" << ends;
strMarks = strm.str();

--Mike-- Friday's GoogleFight results: Britney Spears 2,190,000 - Erica Weichers 23 :( 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click! My really out-of-date homepage Sonork-100.19012 Acid_Helm

[Nemanja Trifunovic]

I would just rearange it a little:

#include <string>
#include <sstream>
std::ostringstream strm;
strm << "I got " << marks << " marks" << std::ends;
std::string strMarks = strm.str();

:beer: