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quantdev2004@yahoo.co.uk
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 Posted: Wed Mar 02, 2005 12:32 pm Post subject: Default8087CW magic reset |
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Dear NG,
I am having hard time trying to understand what is causing a reset of
the Default8087CW system variable.
I am debugging a COM server written with Delphi 5.
This is the code:
I reset Default8087CW to $1332 in the entry point of the delphi
component.
The code:
Procedure EntryPointClass.EntryPointMethod();
begin
// At this point Default8087CW is $27F (all masks are activated)
// Let's reset this to what the correct value should be
Set8087CW($1332);
SomeMethodGoingDeep(); // BREAKPOINT_1
exit; // BREAKPOINT_2
end;
I have a watch on Default8087CW set to "Break when changed".
When I get to BREAKPOINT_1 I hit "Run". Process stops at
BREAKPOINT_2, and the value of Default8087CW has changed back to $27F.
the debugger does not stop when the variable changed.
So I thought I would step into SomeMethodGoingDeep to understand when
the variable was actually being changed. However, if I step into
SomeMethodGoingDeep (as opposed to hitting run), the variable does not
change.
Comments welcome.
Quantdev
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Jamie
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| Posted: Wed Mar 02, 2005 7:50 pm Post subject: Re: Default8087CW magic reset |
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[email]quantdev2004 (AT) yahoo (DOT) co.uk[/email] wrote:
| Quote: | Dear NG,
I am having hard time trying to understand what is causing a reset of
the Default8087CW system variable.
I am debugging a COM server written with Delphi 5.
This is the code:
I reset Default8087CW to $1332 in the entry point of the delphi
component.
The code:
Procedure EntryPointClass.EntryPointMethod();
begin
// At this point Default8087CW is $27F (all masks are activated)
// Let's reset this to what the correct value should be
Set8087CW($1332);
SomeMethodGoingDeep(); // BREAKPOINT_1
exit; // BREAKPOINT_2
end;
I have a watch on Default8087CW set to "Break when changed".
When I get to BREAKPOINT_1 I hit "Run". Process stops at
BREAKPOINT_2, and the value of Default8087CW has changed back to $27F.
the debugger does not stop when the variable changed.
So I thought I would step into SomeMethodGoingDeep to understand when
the variable was actually being changed. However, if I step into
SomeMethodGoingDeep (as opposed to hitting run), the variable does not
change.
Comments welcome.
Quantdev
it could be the bebugger it self doing that. |
try running the app out side the IDE and use a Test message to see what
the value is.
just an idea.
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