If you can rely on your input being formatted like that, just dump it in a stringstream and read it back.
 

const string res = "640x480x32";
int height, width, depth;
char delimiter;  


stringstream stream(res);
stream >> height >> delimiter >> width >> delimiter >> depth;

You could use getline and define 'x' as a delimiter, but then you get each number as a string and still need to convert to int.

You could use .ignore(1) instead of the dummy character, but it will look horrible to read.

If you can rely on your input being formatted like that, just dump it in a stringstream and read it back.

 
</p><div>const string res = "640x480x32";</div>
<div>
<div>int height,width,depth;</div>
<div>char delimiter;</div>
<div> </div>
</div>
<div> </div>
<div>stringstream stream(res);</div>
<div> </div>
<div>stream >> height >> delimiter >> width >> delimiter >> depth;</div>
<div>