How to handle this problem in MS VC++

[Cris Ding]

Hi, everyone,

Suppose the following simple program:

#include "engine.h"

int main()
{
Engine *ep;

if (!(ep = engOpen(NULL))) {
printf("Can't start MATLAB engine");
exit(-1);
}

engClose(ep);
return(0);
}

When I was trying to compile and link the program:

Linking...
engwindemo.obj : error LNK2001: unresolved external symbol _engClose
engwindemo.obj : error LNK2001: unresolved external symbol _engOpen
Debug/engwindemo.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

engwindemo.exe - 3 error(s), 0 warning(s)

Then I found "engClose" and "engOpen" are defined in "liben.def",
which in turn is directed to "libeng.dll" as indicated by the
following information.

LIBRARY libeng.dll
EXPORTS
_engClose=engClose
....
_engOpen=engOpen
....
_libeng_build_date=libeng_build_date
_libeng_version=libeng_version

I added all these two files into the project, but still the linking
error information appears. I wonder whether I have put the
"libeng.dll" into a wrong directory, that is, I should not add
"libeng.dll" into the project, but put it into some other proper
directory instead so that MS VC++ can find it when linking. Could
anyone give me some hints on this? Thanks a lot.

VB
/Cris

 

[Joona I Palaste]

Hi, everyone,

Suppose the following simple program:

#include "engine.h"

int main()
{
Engine *ep;

if (!(ep = engOpen(NULL))) {
printf("Can't start MATLAB engine");
exit(-1);
}

When I was trying to compile and link the program:

Linking...
engwindemo.obj : error LNK2001: unresolved external symbol _engClose
engwindemo.obj : error LNK2001: unresolved external symbol _engOpen
Debug/engwindemo.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

engwindemo.exe - 3 error(s), 0 warning(s)

Then I found "engClose" and "engOpen" are defined in "liben.def",
which in turn is directed to "libeng.dll" as indicated by the
following information.

You'll want to link the "libeng.dll" library. How to do this is none
of comp.lang.c's business, as it's specific to MSVC++.

 

[Mark McIntyre]

Then I found "engClose" and "engOpen" are defined in "liben.def",
which in turn is directed to "libeng.dll" as indicated by the
following information.

This would be a Windows question. You need to ask it over there.

(by the way the function's runtime code may be in the DLL but you still
need a .lib file to link with, unless you're doing /real/ dynamic loading,
which you're not. The .lib contains the stub loader for the DLL code).

 

[Rob Thorpe]

Hi, everyone,

Suppose the following simple program:

#include "engine.h"

int main()
{
Engine *ep;

if (!(ep = engOpen(NULL))) {
printf("Can't start MATLAB engine");
exit(-1);
}

engClose(ep);
return(0);
}

When I was trying to compile and link the program:

Linking...
engwindemo.obj : error LNK2001: unresolved external symbol _engClose
engwindemo.obj : error LNK2001: unresolved external symbol _engOpen
Debug/engwindemo.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

engwindemo.exe - 3 error(s), 0 warning(s)

Then I found "engClose" and "engOpen" are defined in "liben.def",
which in turn is directed to "libeng.dll" as indicated by the
following information.

LIBRARY libeng.dll

EXPORTS
_engClose=engClose
...
_engOpen=engOpen
...
_libeng_build_date=libeng_build_date
_libeng_version=libeng_version

I added all these two files into the project, but still the linking
error information appears. I wonder whether I have put the
"libeng.dll" into a wrong directory, that is, I should not add
"libeng.dll" into the project, but put it into some other proper
directory instead so that MS VC++ can find it when linking. Could
anyone give me some hints on this? Thanks a lot.

VB
/Cris

Ask comp.os.ms-windows.programmer and comp.soft-sys.matlab, they are
likely to know more.

 

[Cris Ding]

Ask comp.os.ms-windows.programmer and comp.soft-sys.matlab, they are
likely to know more.

Thank you guys for such valuable directions.

VB
/Cris

 

[aileia]

libraries

May be the problem is linking libraries, look at this solution.
www
mathworks.com
/support/solutions/data/1-30UM5H.html?product=ML&solution=1-30UM5H