You need several new global variables for this sample application. Add the following variables at the beginning of your C-language source file:
HPEN hDashPen; /* “—-” pen handle */
HPEN hDotPen; /* “...” pen handle */
HBRUSH hOldBrush; /* old brush handle */
HBRUSH hRedBrush; /* red brush handle */
HBRUSH hGreenBrush; /* green brush handle */
HBRUSH hBlueBrush; /* blue brush handle */
You also need new local variables in the window function. Declare the following at the beginning of the MainWndProc function:
HDC hDC; /* display-context variable */
PAINTSTRUCT ps; /* paint structure */
RECT rcTextBox; /* rectangle around the text */
HPEN hOldPen; /* old pen handle */