errors in usage of gcnew and System::IntPtr^ has handler in managed c++

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Hi in my proj

C++

MyClass::Func01(UINT32 param1, UINT32 param2)
{

UINT8* invalBuf = NULL; // System::IntPtr^ invalBuf = NULL; even uncommenting and usage of above would give the same error.
Error	8	error C2059: syntax error : ';'	e:\Proj\ManagedProject.cpp	232
UINT8* outvalBuf = NULL; // System::IntPtr^ outvalBuf = NULL;
Error	9	error C2059: syntax error : ';'	e:\Proj\ManagedProject.cpp	232

UINT16 var1;
UINT32 var2;
.....

when invoking gcnew with above variables, and allocation of memory,

invalBuf = (System::IntPtr) gcnew(var1,true,"invalBuf");
...
memcpy(outBuf,inBuf,var1);
//error C2440: 'type cast' : cannot convert from 'System::IntPtr ^' to 'void *'	e:\Proj\ManagedProject.cpp	249	


outvalBuf[2] = Some bitwise operated value;
Error	13	error C3915: 'System::IntPtr' has no default indexed property (class indexer)	e:\Proj\ManagedProject.cpp	252

outvalBuf[3] = some other bitwise operted values;
....
	
....
....

I need to resolve the errors given correponding to each statements, I am using Managed C++, and using gcnew for allocation of memory, Even if I use System::IntPtr^ has handler, I could not overcome the above error. Any Help in resolving the above would be appreciable.

Also, I am using VS2008 IDE, Win 7 SP1 O/S.

With Regards,
Samanth_90

Posted 20-Mar-12 19:53pm

Member 7985084

Updated 20-Mar-12 20:03pm

Wayne Gaylard

v2

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Sergey Alexandrovich Kryukov 21-Mar-12 2:11am

Did you at least try to read something on the C++/CLI as opposed to C++? This is not that trivial...
--SA

Sergey Alexandrovich Kryukov 21-Mar-12 2:12am

Yes, compiler error messages can be very misleading... sorry.
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-03-20T20:10:00

This code is a mess, nearly beyond repair. First thing you should know: C++/CLI analog of pointer is the manager reference, use '^' instead of '*'.

Generally, if you use C++/CLI, remember that it is pretty far from C++, even though you can combine both. So, instead of starting based on you C++ experience, read a good deal about the C++/CLI language.

Please see:
http://en.wikipedia.org/wiki/C%2B%2B/CLI[^],
http://www.ecma-international.org/publications/standards/Ecma-372.htm[^],
http://msdn.microsoft.com/en-us/library/dtefa218.aspx[^].

—SA