D
DaTurk
What's the CLI equivalent of the empty catch?
i.e.
try{}
catch
{}
i.e.
try{}
catch
{}
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W
William DePalo [MVP VC++]
DaTurk said:What's the CLI equivalent of the empty catch?
i.e.
try{}
catch
{}
How about this:
try
{
Console::WriteLine(L"Hello World");
}
catch ( Exception^ )
{
}
Regards,
Will
G
Guest
try
{
}
catch(...)
{
}
--
David Anton
www.tangiblesoftwaresolutions.com
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{
}
catch(...)
{
}
--
David Anton
www.tangiblesoftwaresolutions.com
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S
SvenC
DaTurk said:What's the CLI equivalent of the empty catch?
i.e.
try{}
catch
{}
Where is that empty catch allowed? It is not standard C++. Do you mean
catch(...) ?
C
Carl Daniel [VC++ MVP]
SvenC said:Where is that empty catch allowed? It is not standard C++. Do you mean
catch(...) ?
It's allowed in C#. It's equivalent to the C++/CLI construct:
try
{
}
catch(Exception^)
{
}
Using catch(...) will also catch native exceptions, and possibly structured
(platform) exceptions, depending on the compiler options used.
-cd
D
DaTurk
Where is that empty catch allowed? It is not standard C++. Do you mean
catch(...) ?
My apologies, I was refering to c#
J
Jochen Kalmbach [MVP]
Hi Carl!
No. "catch(Exception^)" is *not* the same as "catch" in C#!
"catch(Exception^)" will *only* catch exceptions which are derived from
"System.Exception"!
"catch" will catch *all* Exceptions (derived from "System.Object")!
It also will catch native exceptins in C#!!!
Therefor the C++/CLI equivalent of "catch" is "catch(System::Object^)" !
See also: Basic Concepts in Using Managed Exceptions
http://msdn2.microsoft.com/en-us/library/df24ysb6(VS.80).aspx
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
It's allowed in C#. It's equivalent to the C++/CLI construct:
try
{
}
catch(Exception^)
{
}
No. "catch(Exception^)" is *not* the same as "catch" in C#!
"catch(Exception^)" will *only* catch exceptions which are derived from
"System.Exception"!
"catch" will catch *all* Exceptions (derived from "System.Object")!
It also will catch native exceptins in C#!!!
Therefor the C++/CLI equivalent of "catch" is "catch(System::Object^)" !
See also: Basic Concepts in Using Managed Exceptions
http://msdn2.microsoft.com/en-us/library/df24ysb6(VS.80).aspx
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
J
Jochen Kalmbach [MVP]
DaTurk said:What's the CLI equivalent of the empty catch?
i.e.
try{}
catch
{}
try {}
catch(System::Object^)
{}
--
Greetings
Jochen
My blog about Win32 and .NET
http://blog.kalmbachnet.de/
C
Carl Daniel [VC++ MVP]
Jochen Kalmbach said:Hi Carl!
No. "catch(Exception^)" is *not* the same as "catch" in C#!
"catch(Exception^)" will *only* catch exceptions which are derived from
"System.Exception"!
"catch" will catch *all* Exceptions (derived from "System.Object")!
It also will catch native exceptins in C#!!!
Egads!
I'd forgotten that the CLR actually supporting throwing something not
derived from System.Exception!
-cd
B
Ben Voigt
It also will catch native exceptins in C#!!!
Wouldn't catch (Exception^) do so as well, giving an SEHException? Or is
that only for p/invoke?
Wouldn't catch (Exception^) do so as well, giving an SEHException? Or is
that only for p/invoke?
J
Jochen Kalmbach [MVP]
Hi Ben!
SEHException is also derived from "System.Exception". But you can throw
*any* object as an exception. Therefor, if you want to catch *all*
exceptions, you need to catch "System.Object" instead of "System.Exception"!
See:
#pragma unmanaged
void Test1()
{
throw 1;
}
#pragma managed
void Test2()
{
throw 2;
}
void Test3()
{
throw gcnew System::Object();
}
int main()
{
try
{
Test1();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test1: " + o->GetType()->ToString());
}
try
{
Test2();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test2: " + o->GetType()->ToString());
}
try
{
Test3();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test3: " + o->GetType()->ToString());
}
}
Output is:
Test1: System.Runtime.InteropServices.SEHException
Test2: System.Runtime.InteropServices.SEHException
Test3: System.Object
Greetings
Jochen
Wouldn't catch (Exception^) do so as well, giving an SEHException? Or is
that only for p/invoke?
SEHException is also derived from "System.Exception". But you can throw
*any* object as an exception. Therefor, if you want to catch *all*
exceptions, you need to catch "System.Object" instead of "System.Exception"!
See:
#pragma unmanaged
void Test1()
{
throw 1;
}
#pragma managed
void Test2()
{
throw 2;
}
void Test3()
{
throw gcnew System::Object();
}
int main()
{
try
{
Test1();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test1: " + o->GetType()->ToString());
}
try
{
Test2();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test2: " + o->GetType()->ToString());
}
try
{
Test3();
}
catch(System::Object ^o)
{
System::Console::WriteLine("Test3: " + o->GetType()->ToString());
}
}
Output is:
Test1: System.Runtime.InteropServices.SEHException
Test2: System.Runtime.InteropServices.SEHException
Test3: System.Object
Greetings
Jochen
B
Ben Voigt
Jochen Kalmbach said:Hi Ben!
SEHException is also derived from "System.Exception". But you can throw
*any* object as an exception. Therefor, if you want to catch *all*
exceptions, you need to catch "System.Object" instead of
"System.Exception"!
See:
I wasn't doubting that catching System.Object will catch all exceptions...
but wouldn't catching System.Exception also catch all exceptions, decoding
managed objects derived from Exception, and wrapping everything else in
SEHException?
J
Jochen Kalmbach [MVP]
Hi Ben!
I don't understand the background of this question?
I don't know the internals of every assembly; so I don't know if
"System.Exception" will catch *all* exceptions... regardless of
SEHException...
Greetings
Jochen
I wasn't doubting that catching System.Object will catch all exceptions...
but wouldn't catching System.Exception also catch all exceptions, decoding
managed objects derived from Exception, and wrapping everything else in
SEHException?
I don't understand the background of this question?
I don't know the internals of every assembly; so I don't know if
"System.Exception" will catch *all* exceptions... regardless of
SEHException...
Greetings
Jochen
M
Mattias Sjögren
I wasn't doubting that catching System.Object will catch all exceptions...
You can also use the RuntimeCompatibilityAttribute on your assembly
with WrapNonExceptionThrows = true to make sure all exceptions you see
are derived from Exception (if they aren't already, they get wrapped
in a RuntimeWrappedException). That's what C# does for example.
Mattias
I don't understand the background of this question?
I don't know the internals of every assembly; so I don't know if
"System.Exception" will catch *all* exceptions... regardless of
SEHException...
You can also use the RuntimeCompatibilityAttribute on your assembly
with WrapNonExceptionThrows = true to make sure all exceptions you see
are derived from Exception (if they aren't already, they get wrapped
in a RuntimeWrappedException). That's what C# does for example.
Mattias