DLL, Clipboard

Version A

CMY layers of bitmaps

• Demonstration
• DLL:
  • implements a function: void bmpproc( HWND hwnd, void (CALLBACK *stepFunction)(char *) );  
  • functionality:
    • loads a bitmap from the clipboard 
    • saves to the clipboard the cyan, magenta and yellow layers of the loaded bitmap one after another
    • after each of the layers is saved, it calls the stepFunction with a description of which layer has just been evaluated as a parameter
• Main application: 
  • menu with options:
    • Load DLL / Close DLL / Process Clipboard 
    • Close DLL and Process Clipboard options are grayed if no DLL is loaded
    • Process Clipboard executes the function containted in the DLL
  • implements the stepFunction: it launches a MessageBox with the message passed to a function as a parameter
• Requirements:
  • correct use of bitmaps, GDI objects and DCs (if any are needed) 
  • each library opening should be paired with library closing, the same applies to clipboard
• Hints:
  • the layers can be obtained with: RGB(GetRValue(cr), 255, 255), RGB(255, GetGValue(cr), 255),RGB(255, 255, GetBValue(cr)), where cr is the colour of the original pixel
• Approximate points:
  • DLL: 3.5
  • using clipboard: 3.5
  • functionality: 3.0