[program-l] Re: Calling function in c++ dlls
- From: "Sean Farrow" <s0201608@xxxxxxxxxx>
- To: <program-l@xxxxxxxxxxxxx>
- Date: Wed, 9 Mar 2005 17:29:32 -0000
Hi:
I hav base classes and some inherited ones, hence have many header files,
how do I get round this problem, and how do I export a class, what is the
format for doing this for example:
class test{
public:
Void testFunc(char string);
};
how would I export this?
Cheers
Sean Richard Farrow,
Student, Sound Studio Technology,
North-East Wales Institute Of Higher Education.
Tel.: +44(0) 7747081574
E-mail: s0201608@xxxxxxxxxx
_____
From: program-l-bounce@xxxxxxxxxxxxx [mailto:program-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Will Pearson
Sent: 09 March 2005 16:59
To: program-l@xxxxxxxxxxxxx
Subject: [program-l] Re: Calling function in c++ dlls
Hi Sean,
Yes, you would have to declare them as DLLEXPORT and DLLIMPORT, but in the
header, not in the cpp file, assuming you're placing your declarations in a
header. The easiest way to do this is with preprocessor macros in the
header. Something like
// MyDLL.h
#ifdef CREATING
#define IMPORTEXPORT DLLEXPORT
#else
#define IMPORTEXPORT DLLIMPORT
#endif
void IMPORTEXPORT MyFunc();
// end of .h
// MyDLL.cpp
#define CREATING
/* let the compiler know we're creating the DLL so that it can apply the
right convention */
// write code
If you're using a DLL Export File (.DEF), then you don't have to do this, as
you use the .def file to declare what functions/classes should be exported.
You'll have three files after compilation and linking: the .h, a linker stub
(.lib), and a .DLL. You'll need to number include the .h in the project
where you wish to use the DLL, as well as specifying the .lib as input to
the linker. Then, at run-time, the easiest place in the DLL search path to
place your DLL is in the folder that the ..exe you're running is located in.
Will
----- Original Message -----
From: Sean Farrow <mailto:s0201608@xxxxxxxxxx>
To: program-l@xxxxxxxxxxxxx
Sent: Wednesday, March 09, 2005 9:51 AM
Subject: [program-l] Re: Calling function in c++ dlls
Hi:
A coupple of questions following up from the last message:
1. Does it matter that the functions are within classes?
2. do I need to declare the functions as export/import in the dll/main
program?
Cheers
Sean Richard Farrow,
Student, Sound Studio Technology,
North-East Wales Institute Of Higher Education.
Tel.: +44(0) 7747081574
E-mail: s0201608@xxxxxxxxxx
_____
From: program-l-bounce@xxxxxxxxxxxxx [mailto:program-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Laura Eaves
Sent: 09 March 2005 09:26
To: program-l@xxxxxxxxxxxxx
Subject: [program-l] Re: Calling function in c++ dlls
Don't you have the header files for the library implemented in the dll?
Just call the functions like you normally would.
--le
----- Original Message -----
From: Sean <mailto:s0201608@xxxxxxxxxx> Farrow
To: program-l@xxxxxxxxxxxxx
Sent: Wednesday, March 09, 2005 3:48 AM
Subject: [program-l] Calling function in c++ dlls
Hi:
I need to call functions inside a c++ dll with classes from a c++ program?
what is the best way of doing this?
Cheers
Sean Richard Farrow,
Student, Sound Studio Technology,
North-East Wales Institute Of Higher Education.
Tel.: +44(0) 7747081574
E-mail: s0201608@xxxxxxxxxx
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