std string streams

[Dylan]

Is there a string stream I can write into and read from?

I've tried std::stringstream but it won't let me read from it.

ie I can do this:

int iData = 123
std::stringstream ss;
ss << 123;

but not this afterwards:

int iDataReadFromStream;
iDataReadFromStream << ss;


Is there a data structure that allows me to do both?

thanks

 

[Sebastian Hungerecker]

ie I can do this:

int iData = 123
std::stringstream ss;
ss << 123;

but not this afterwards:

int iDataReadFromStream;
iDataReadFromStream << ss;

I'm no expert, but I'd say the latter doesn't work, because it calls the
<<-operator for int and not for stringstream.
Try:
ss>>iDataReadFromStream;

 

[Richard Herring]

Is there a string stream I can write into and read from?

I've tried std::stringstream but it won't let me read from it.

ie I can do this:

int iData = 123
std::stringstream ss;
ss << 123;

but not this afterwards:

int iDataReadFromStream;
iDataReadFromStream << ss;

ss >> iDataReadFromStream;

Streams always go on the left.

 

[Dylan]

I'm no expert, but I'd say the latter doesn't work, because it calls the
<<-operator for int and not for stringstream.
Try:
ss>>iDataReadFromStream;

that doesn't work either...

 

[Dylan]

that doesn't work either...

forgive me, it does work.

 

[Joe Bacigalupa]

maybe your thinking of a situation like this...

const int MaxSize = 1023;
std::stringstream convert;
char temp[MaxSize + 1] ={0};
float val;

// Say we have a control that has a "text" floating point value
GetDlgItemText(IDC_SOME_CONTROL, temp, MaxSize);

convert << temp;
convert >> val;

// if you forgot to call this afterward, you would have issues writing or
reading from the stringstream
convert.clear();
convert.str("");