<p>In wxWidgets, how can you find the pixels per inch on a wxDC? I'd like to be able to scale things by a real world number like inches. That often makes it easier to use the same code for printing to the screen and the printer.</p>

The
```
UIImagePickerController
```
class lets you take pictures or choose them from the photo library.  Specify the source type as
```
UIImagePickerControllerSourceTypeCamera
```
.
See also this question previously asked:
Access the camera with iPhone SDK