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7 - Changing Your Code
At this point, you may have a clean compile - congratulations! However, more than likely, you'll get a few little compile errors. The most notable programming changes from OS1 include new and changed functions, such as in CList, CWindow, and CArray - if any of these appear to be related to your problem, review the OS2 documentation for details of the changes.Because of the move to a library, global variables have changed for the GUI subsystem, with some of them becoming functions:
| Old Global Variable | Replacement Function | ||
| GUI_System_Font | GUI_GetSystemFont() | ||
| GUI_Flags | GUI_Flags_Ptr() | ||
| Default_Fontgroup | GUI_Default_Fontgroup_ptr() | ||
| System_Fontgroup | GUI_System_Fontgroup_ptr() | ||
| GUI_WeekdayNames | GUI_GetDateNames(&w,&m) | ||
| GUI_MonthNames | GUI_GetDateNames(&w,&m) |
Missing from this list is GUI_Default_Font. For that, you will have to use GetFont() in a window or else store and pass your own font pointer variable.
Another noticeable change is that extern is now necessary in const data tables:
const char info[]={...
must now be
extern const char info[]={...
The general guideline is that if there is a change necessary, your code won't compile, making it easy to troubleshoot the problem.
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