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New Message on BDOTNET
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From: aamirOnline
Message 2 in Discussion
hi
can you please pose your questions related files
so that we can go through and answer your question properly
regards
m aamir
maniar
[System Analyst
(CWS)]
[Freelanse OOPD
consultant]
----- Original Message -----
From:
shailaja
To: BDOTNET
Sent: Tuesday, September 23, 2003 4:36
PM
Subject: Query regarding managed
c++
New Message on BDOTNET
Query
regarding managed c++
Reply
Reply to Sender Recommend
Message 1 in
Discussion
From: shailaja
Hello,
Can anyone tell me How unmanaged DLL is used in
managed applications?
One programmer from our company has
left project halfway and I have been assigned to same project.
Unfortunately no documentation is available. I do not have
experience on VC++/Managed C++. So along with reading MSDN I am
doing some reverse engineering.
I could figure out that
person has created Managed class library which is refrenced in
other projects. Only managed keyword is "__gc classname"
In
managed c++ library header file of native dll is included and in
source files section lib file for same dll is
placed.
Managed library is calling API's from unmanaged
library. Parameters for those APIs are of type int , char, array
of characters, predefined structures containing memebers with
data types int , char, array of characters, pointer to array of
char.
Those structure members are initialized with
required values before passing them as parameters to APIs of
unmanaged dll. For that variable with same stucture types are
defined as that mentioned in header file for native
dll.
These structure variables are not declared as managed
but those are inside managed class?
And it is working just
fine.
So my first doubt is are those variables treated as
managed variables or value types?
And __box / __nogc is also
not used then I was wondering how it is working.
Can anyone
explain me how it is working?
And also looking at header
file I could not figure out what type of dll it is means created
using c++ or c
The function definitions are like
------------------------------------------------------------------
#include
<WINDOWS.H>// in the beginning of file
#if
!defined( PREANSI )
extern "C" int __stdcall MyFunction(int
k)
#else
int __stdcall MyFunction(int
k)
#endif
-------------------------------------------------------------------
So
my second doubt is , is dll created using c/ c++ and what is
type of dll?
It is not exporting any types. Because help is
given for building wrapper around COM Componenents or
C++
I want to know these things so that I can do further
implementation with understanding.
Please help me regarding
this.
Thanks in advance.
Regards
Shailaja
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