戻る

Signature:
void height()

Summary:
Returns the height of the screen as an exception.
Returns the error message as a string exception if failed.

Example:

```
try {
screen.height();
} catch (unsigned int height) {
std::cout << "height = " << height << std::endl;
} catch (const char *msg) {
std::cerr << "cannot retrieve the screen height: " << msg << std::endl;
}
```