Type Conversions
in [Win32 Kernel]
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From: Hugo gleaves on 18 Dec 2008 09:16 Does anyone know if there are any routines in the C runtime that allows comversion from one type to another? We have a need to potentially convert data from one type to another at runtime, we dont know until runtime and the 'type' of both source and target are a simple code. We need to support from/to char, wchar, short, long, long long, float and double including the signed/unsigned too. We can code these ourselves and perhaps make it a 2D array of function pointers (initialized to point at the functions during startup). Thus we can then code: ConvertData[SourceType][TargetType](addr1, addr2); However, before we do this we want to be sure we dont reinvent the wheel. Any info appreciated. This is for all platforms, XP, Vista, Server etc and 32-bit & 64-bit.
From: Gary G. Little on 18 Dec 2008 11:39 I'm more C than C++, but we use the following ... static_cast<type> (target) dynamic_cast<type> (target) -- The personal opinion of Gary G. Little "Hugo gleaves(a)hotmail.com>" <hugh<underbar> wrote in message news:C97A6187-024A-48B3-AAEB-7335811463FD(a)microsoft.com... > Does anyone know if there are any routines in the C runtime that allows > comversion from one type to another? > > We have a need to potentially convert data from one type to another at > runtime, we dont know until runtime and the 'type' of both source and > target > are a simple code. > > We need to support from/to char, wchar, short, long, long long, float and > double including the signed/unsigned too. > > We can code these ourselves and perhaps make it a 2D array of function > pointers (initialized to point at the functions during startup). > > Thus we can then code: > > ConvertData[SourceType][TargetType](addr1, addr2); > > However, before we do this we want to be sure we dont reinvent the wheel. > > Any info appreciated. > > This is for all platforms, XP, Vista, Server etc and 32-bit & 64-bit. > > > >
From: Christian Kaiser on 18 Dec 2008 12:05 VariantChangeType()? VarXxxFromYyyy() -> VARTYPE coercion API in OLEAUTO.H! Christian "Hugo gleaves(a)hotmail.com>" <hugh<underbar> wrote in message news:C97A6187-024A-48B3-AAEB-7335811463FD(a)microsoft.com... > Does anyone know if there are any routines in the C runtime that > allows > comversion from one type to another? > > We have a need to potentially convert data from one type to another > at > runtime, we dont know until runtime and the 'type' of both source > and target > are a simple code. > > We need to support from/to char, wchar, short, long, long long, > float and > double including the signed/unsigned too. > > We can code these ourselves and perhaps make it a 2D array of > function > pointers (initialized to point at the functions during startup). > > Thus we can then code: > > ConvertData[SourceType][TargetType](addr1, addr2); > > However, before we do this we want to be sure we dont reinvent the > wheel. > > Any info appreciated. > > This is for all platforms, XP, Vista, Server etc and 32-bit & > 64-bit. > > > >
From: Jochen Kalmbach [MVP] on 18 Dec 2008 12:07 Hi Hugo! > Does anyone know if there are any routines in the C runtime that allows > comversion from one type to another? > > We need to support from/to char, wchar, short, long, long long, float and > double including the signed/unsigned too. In general you would use "VARIANT" for this scenario. See also: VARIANT and VARIANTARG http://msdn.microsoft.com/en-us/library/ms221627 VariantChangeType http://msdn.microsoft.com/en-us/library/ms221258 Variant Manipulation Functions http://msdn.microsoft.com/en-us/library/ms221673 -- Greetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/
From: Hugo gleaves on 22 Dec 2008 13:44
Thanks to each of you, this is most interesting. Rgds Hugh "Hugo" wrote: > Does anyone know if there are any routines in the C runtime that allows > comversion from one type to another? > > We have a need to potentially convert data from one type to another at > runtime, we dont know until runtime and the 'type' of both source and target > are a simple code. > > We need to support from/to char, wchar, short, long, long long, float and > double including the signed/unsigned too. > > We can code these ourselves and perhaps make it a 2D array of function > pointers (initialized to point at the functions during startup). > > Thus we can then code: > > ConvertData[SourceType][TargetType](addr1, addr2); > > However, before we do this we want to be sure we dont reinvent the wheel. > > Any info appreciated. > > This is for all platforms, XP, Vista, Server etc and 32-bit & 64-bit. > > > > |