Removing Certain warning

  • Thread starter Thread starter Jay
  • Start date Start date
J

Jay

Hey There,
I have this line of code:
retVal = RegOpenKeyEx(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

and it produces this warning:
warning C4312: 'type cast' : conversion from 'DWORD' to 'HKEY'
of greater size


What can I do to have this warning be removed?

Thanks!
Jay
(patelj27b at gmail dot com)
 
I have this line of code:
retVal = RegOpenKeyEx(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

and it produces this warning:
warning C4312: 'type cast' : conversion from 'DWORD' to 'HKEY'
of greater size
Click to expand...

Hi,
what is the type of RetVal?
RegOpenKeyEx returns a long, not a HKEY. if retVal is a HKEY, that would be
the cause of the problem.

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
 
Jay said:
Hey There,
I have this line of code:
retVal = RegOpenKeyEx(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

and it produces this warning:
warning C4312: 'type cast' : conversion from 'DWORD' to 'HKEY'
of greater size


What can I do to have this warning be removed?

Thanks!
Jay
(patelj27b at gmail dot com)
Click to expand...

Jay:

You need to show us more code. What are the declared types of all the
variables in this line of code?

David Wilkinson
 
David said:
Jay:

You need to show us more code. What are the declared types of all the
variables in this line of code?

David Wilkinson
Click to expand...

Hey There,
retVal is declared as a long, subKey is a char [46], and OpenKey is
HKEY. I don't think these have anything to do with it, from what I can
tell it has to do with HKEY_LOCAL_MACHINE being a constant with an int
value, and needing to be of type "HKEY". Any ideas?

Thanks!
Jay
(patelj27b at gmail dot com)
 
retVal = RegOpenKeyEx(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);
retVal is declared as a long, subKey is a char [46], and OpenKey is
HKEY. I don't think these have anything to do with it, from what I can
tell it has to do with HKEY_LOCAL_MACHINE being a constant with an int
value, and needing to be of type "HKEY". Any ideas?
Click to expand...

If that is the case, then you can solve the problem with a simple explicit
typecast i think.
(INT_PTR)HKEY_LOCAL_MACHINE

Are you doing this on x64 perhaps?
Because otherwise a handle should be the same size as a DWORD on x386,
unless I am missing something obvious.

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
 
Bruno said:
retVal is declared as a long, subKey is a char [46], and OpenKey is
HKEY. I don't think these have anything to do with it, from what I can
tell it has to do with HKEY_LOCAL_MACHINE being a constant with an int
value, and needing to be of type "HKEY". Any ideas?
Click to expand...

If that is the case, then you can solve the problem with a simple explicit
typecast i think.
(INT_PTR)HKEY_LOCAL_MACHINE

Are you doing this on x64 perhaps?
Because otherwise a handle should be the same size as a DWORD on x386,
unless I am missing something obvious.

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
Click to expand...

Thanks for the input, but when I set the line to:
retVal =
RegOpenKeyEx((INT_PTR)HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

I just get the error:
error C2664: 'RegOpenKeyExA' : cannot convert parameter 1 from
'INT_PTR' to 'HKEY'
Conversion from integral type to pointer type requires
reinterpret_cast, C-style cast or function-style cast

Is there something else I should do?

-Jay
(patelj27b at gmail dot com)
 
Thanks for the input, but when I set the line to:
retVal =
RegOpenKeyEx((INT_PTR)HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

I just get the error:
error C2664: 'RegOpenKeyExA' : cannot convert parameter 1 from
'INT_PTR' to 'HKEY'
Conversion from integral type to pointer type requires
reinterpret_cast, C-style cast or function-style cast

Is there something else I should do?
Click to expand...

D'oh.
That what you get when posting with a head full of snot.
Of course I meant
(HKEY)HKEY_LOCAL_MACHINE

But I just checked that constant, and it is defined like this:
(( HKEY ) (ULONG_PTR)((LONG)0x80000002) )
So I don't think the parameter is the problem.

To be sure, I just compiled this with /W4, and got no warnings.
char subKey[] = "test";
HKEY OpenKey;
DWORD retVal =
RegOpenKeyExA(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

What version of VC++ are you using, and are you really sure that retVal is a
DWORD?

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
 
Bruno said:
Thanks for the input, but when I set the line to:
retVal =
RegOpenKeyEx((INT_PTR)HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

I just get the error:
error C2664: 'RegOpenKeyExA' : cannot convert parameter 1 from
'INT_PTR' to 'HKEY'
Conversion from integral type to pointer type requires
reinterpret_cast, C-style cast or function-style cast

Is there something else I should do?
Click to expand...

D'oh.
That what you get when posting with a head full of snot.
Of course I meant
(HKEY)HKEY_LOCAL_MACHINE

But I just checked that constant, and it is defined like this:
(( HKEY ) (ULONG_PTR)((LONG)0x80000002) )
So I don't think the parameter is the problem.

To be sure, I just compiled this with /W4, and got no warnings.
char subKey[] = "test";
HKEY OpenKey;
DWORD retVal =
RegOpenKeyExA(HKEY_LOCAL_MACHINE,subKey,0,KEY_READ,&OpenKey);

What version of VC++ are you using, and are you really sure that retVal is a
DWORD?

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
Click to expand...

Mr. Van Dooren,
I am currently using Visual Studio 2003

-Jay
(patelj27b at gmail dot com)
 
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