Using control callback function with a control (a button) apparently
results in wrong
parameter values when compiling to 386 (values are correct compiling
to
ppc).
The attached case refers to a callback procedure myActionProc
(lControlRef: ControlRef; PartCode: ControlPartCode) applied to a push
button. Essentially:
- Compiling to ppc, everything is correct (in particular PartCode=
10)
- Compiling to 386, the value of lControlRef is correct, but the
value of PartCode is wrong (a random value)
As I got the same results (first parameter, i.e. the ControlRef,
correct, others wrong) with callbacks with more parameters (as the ones
used with DataBrowser), it would seem related to different
architecture's parameter passing modes, but I couldn't get it out.
Thanks in advance for any suggestion.
Regards
Francesco Panasiti
=============================================================
(The following code is derived from the default FPC Carbon
Application 2.4.0 template).
unit MainUnit;
interface
procedure RunMainProcedure;
implementation
uses
MacOSAll;
procedure RunMainProcedure;
var
err : OSStatus;
nibRef : IBNibRef;
window : WindowRef;
lRect: Rect;
var
theControlRef: ControlRef;
lControlActionUPP: ControlActionUPP;
procedure myActionProc (lControlRef: ControlRef; PartCode:
ControlPartCode);
var
lstring: string;
begin
MoveTo(7, 280);
Str(partCode, lstring);
DrawString(lstring);
end;
begin
// Create a Nib reference passing the name of the nib file
(without the .nib extension)
// CreateNibReference only searches into the application bundle.
err := CreateNibReference(CFSTR('main'), nibRef);
// Once the nib reference is created, set the menu bar.
"MainMenu" is the name of the menu bar
// object. This name is set in InterfaceBuilder when the nib is
created.
err := SetMenuBarFromNib(nibRef, CFSTR('MenuBar'));
// Then create a window. "MainWindow" is the name of the window
object. This name is set in
// InterfaceBuilder when the nib is created.
err := CreateWindowFromNib(nibRef, CFSTR('MainWindow'), window);
SetRect(lRect, 10, 100, 110, 200);
theControlRef := NewControl(window, lRect, 'OK', true, 0, 0, 1,
kControlBevelButtonNormalBevelProc, 0);
lControlActionUPP:= NewControlActionUPP(ControlActionProcPtr
(@myActionProc));
SetControlAction(theControlRef, lControlActionUPP);
// We don't need the nib reference anymore.
DisposeNibReference(nibRef);
ShowWindow(window);
SetPort(GetWindowPort(window));
RunApplicationEventLoop;
Halt(byte(err));
end;
end.
=============================================================
program Start;
uses
MainUnit;
begin
RunMainProcedure;
end.
=============================================================
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