When did WPARAM change from being signed to unsigned?

问题

In Delphi 6 WPARAM is declared as being signed:

WPARAM = Longint;

In Delphi 2010 WPARAM is declared as being signed:

WPARAM = INT_PTR;

But in XE2 it is declared as being unsigned:

WPARAM = UINT_PTR;

The official Windows definition is:

typedef UINT_PTR WPARAM;

This matches with XE2.

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Does anyone know whether the change was made for XE or for XE2?

回答1:

In Delphi XE WPARAM = INT_PTR; so the change was introduced in XE2.

来源：https://stackoverflow.com/questions/7837084/when-did-wparam-change-from-being-signed-to-unsigned