Converting int to const char* ?

How do I do this in c++?

It's driving me crazy.

thanks

Can you give more information on exactly what you're trying to do? Maybe an example?

At first glance I'd say you'd use a stringstream (or boost's lexical_cast if you have boost).

How do you use a stringstream?

I using some opencv function which takes a const char*, and I need to make the const char*'s I give it dynamic, hence I'm incrementing an int and converting to a const char*.

You can search for more examples and instructions:

Code:

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#include <sstream>

// ...

void func(const char*);

// ...

int your_int = 33;
std::ostringstream ostr;
ostr << your_int;
func(ostr.str().c_str());

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The str() returns a C++ string, and then c_str() is called on that string to return a const char*.

thanks, will try that in a sec

Quote:

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Originally Posted by Daved

The str() returns a C++ string, and then c_str() is called on that string to return a const char*.

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Bear in mind that the pointer is only valid as long as the stringstream exists. If you need it longer than that, you need to make a copy somehow.

How can I do the following?

ostr << "a" + i + ".jpg" ;

where i is an int

error C2110: '+' : cannot add two pointers

Use << instead of +.

It works like you were outputting those things to cout. You would use << there as well.