If you build an application in ATL, you have to create your own persistence scheme. The ATL Scribble sample uses a simple comma-separated data format for storing the points to a file. The File Open and File Save common dialog boxes provide the file selection user interface. A sketch is persisted by enumerating over the points that define the user's strokes and writing them to the file, as you can see in this section from CStroke:
void CStroke::Save(FILE* file) { int nPoints = m_points.size(); _ftprintf(file, _T("%d\n"), nPoints); POINTITERATOR it; for(it = m_points.begin(); it != m_points.end(); it++) { POINT pt = *it; _ftprintf(file, _T("%d,%d\n"), pt.x, pt.y); } } |
Of course, you can choose whichever file format you prefer, such as XML.