Upgrading From CBuilder 3 To CBuilder 4 (Patch 1)

Things To Do Before

• If you are using the OnCreate or OnDestroy events, move that code to the class constructor and destructor respectively. These events are only useful to Delphi programmers, and because of a change in when these events fire with C++ Builder 4, errors are likely to result from leaving any code in them.

Things To Do Afterward

• Close the comment on richedit.h line #define PFA_JUSTIFY 4 /* New paragraph-alignment option 2.0 (*) to then read #define PFA_JUSTIFY 4 /* New paragraph-alignment option 2.0 (*) */

• References such as Table1->Fields[Index] must be changed to Table1->Fields->Fields[Index]

• TFormDesigner is now _di_IFormDesigner

• You should no longer provide a TComponentEditor constructor in your TComponentEditor derived class.

• BCB is a little more rigid now about references to types defined in your class, for instance as function return values. These need to be qualified with the class operator.

• Expressions assigning to tagVariant are probably now assigning to TVariant, and the OleVariant constructor should be replaced with TVariant, except when referring to a field->AsVariant (in which case the OleVariant(field->AsVariant) becomes field->AsVariant).

• The BeginDrag member function now requires a Threshold (in pixels) as the second parameter. The documentation states the default is zero - however, there is no default; you must supply the 0.

• You should no longer provide a property editor constructor in any TPropertyEditor derived class.

• TTable::AddIndex now requires an additional parameter "DescFields" - not described, but probably a list of fields to be indexed descending.