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Jimbob Wallace
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 Posted: Tue Dec 20, 2005 12:51 pm Post subject: Calling Matlab External Engine from C++ GUI |
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Hi
I'm trying to make external calls to the Matlab engine from a GUI developed in C++ Builder 6. I'm having a problem with file linkage. This is the post I put onto the Matlab areas:
| Quote: |
I am trying to use the Matlab External Interface to develop a GUI in |
Borland C++ Builder 6 that will make external calls to the Matlab
Engine (7 release14). I am getting the following errors:
[C++ Warning] Unit1.cpp(22): W8060 Possibly incorrect assignment
[C++ Warning] Unit1.cpp(25): W8004 'ep' is assigned a value that is
never used
[Linker Error] Unresolved external '_engOpen' referenced from
C:PROGRAM FILESBORLANDCBUILDER6PROJECTSUNIT1.OBJ
Steps followed:
Have Matlab 7 release 14 and Borland C++ Builder 6 operating on Windows
XP Pro
1. I add a test button to the form
2. Add #include "engine.h" to top of cpp file
3. Add the following code to the test buttons fast call for click:
Engine *ep;
if (!(ep = engOpen(NULL))) {
}
4. Copied over library files required by libeng, as in guide
5. Typed matlab /regserver at C:MATLAB7binwin32 in command prompt to
register, as instructed in Help file - engOpen (External Interfaces
Reference). Result was to open a Matlab Command Window.
6. In C++ Builder, Project->Options - Directories/Conditionals tab
added following paths:
7. Include path: C:MATLAB7externinclude
Library path: C:MATLAB7externlibwin32borlandbc54 (I am using
version Borland C++ v6. I tried other options, bc50 and bc53 with same
problem. This is the only place where I can see an obvious problem.
Do I need a path with bc60 or similar? If so where can I get it?)
C:MATLAB7binwin32
8. Set the path environment variable in Control Panel
9. Tried compiling and got errors as above.
I have seen that this is quite a common query on this forum. The only
clue that I have is there is no bc60 path in lib.
I am pretty new to C++ as well as Builder. Someone suggested that I need to tell it to link to the libeng.lib. Does this sound right and if so how do I do it?
I hope this post is in the correct borland.public.cppbuilder.* area. If not can you direct me to the correct one
Thanks in advance
Jimbob
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Bob Gonder
Guest
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| Posted: Tue Dec 20, 2005 4:14 pm Post subject: Re: Calling Matlab External Engine from C++ GUI |
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Jimbob Wallace wrote:
| Quote: | Engine *ep;
if (!(ep = engOpen(NULL))) {
[C++ Warning] Unit1.cpp(22): W8060 Possibly incorrect assignment
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Correct, it looks to the compiler like you meant ==
Try being more explicit:
if ( 0 == (ep = engOpen(NULL) ) )
| Quote: | }
[C++ Warning] Unit1.cpp(25): W8004 'ep' is assigned a value that is
never used
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Correct. You never use it after assigning to it.
Add more code that actually uses ep.
Or remove ep from the program altogether:
if ( 0 == engOpen(NULL) ) )
| Quote: | [Linker Error] Unresolved external '_engOpen' referenced from
I am pretty new to C++ as well as Builder. Someone suggested that I need to tell it to link to the libeng.lib.
Does this sound right and if so how do I do it?
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Yes. Add the lib to your project window.
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