DLL, Clipboard

Version B

Text statistics (histogram)

• Demonstration
• DLL:
  • implements a function: void textstat( char array[], int size, HWND hwnd, BOOL (CALLBACK *stepFunction)(int, int));  
  • functionality:
    • takes the text buffer and its size as arguments 
    • creates a bitmap, which shows the histogram for the number of occurences of each of the characters from between #32 and #126 (decimal ASCII codes).
    • while evaluating the stats, calls the stepFunction after each character 
    • saves the bitmap into the clipboard
• 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 takes the text data from the clipboard, and executes the function containted in the DLL passing the text data as an argument
  • implements the stepFunction:
    • updates the progress shown on the Window Bar (see the demonstration) 
• 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
• Approximate points:
  • DLL: 3.5
  • using clipboard: 3.5
  • functionality: 3.0