Undefined function or variable 'fid' , but 'fid' isn't in any of the script files

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Bill
Bill 2011-8-16
Have created a Matlab generated DLL that is called from a Visual Studio 2010 C++ application. There are 4 M files (written by an ex co-worker 10 years ago) that are compiled for the DLL ; there is no variable or function named 'fid' in any of them. At run time, I catch a mwException after the call to the DLL, and the exception.what() shows "Undefined function or variable 'fid' ".
I'm sorry that I can't show the M files (it's proprietary code in a competitive market) but 'fid' is not in any of them, or even in the C++ application itself.
Not much to go on, I'm afraid - I was just hoping that somebody might have a suggestion for someone new to Matlab. Thanks.

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回答（2 个）

C.J. Harris
C.J. Harris 2011-8-16
The variable 'fid' is usually associated with file reading. You might want to start your search at those points in the code where you either open or close an external file (such as a txt/dat file).
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Bill
Bill 2011-8-16
Thanks Chris. I actually did check that when I had an 'aha' moment but the two fopen's are :
FILE* pFile = fopen(sFileName,"wt");
FILE* f_lev = fopen (sLevCrFil, "wb");
Since the application compiled and ran fine before the Matlab DLL was added, I had assumed that the undefined function/variable had to be in the M files which is not the case. I'm also wondering now if I have caught the correct error message. Could it be a red herring?
try { Do_Work( nargout ,
mxMatlab_LSts,
mxMatlab_DegSts,
mxMatlab_ExSet,
mxMatlab_RMS,
(mwArray)Matlab_CD_Op,
(mwArray)Matlab_Cr_D,
(mwArray)Matlab_CurvOp,
(mwArray)Matlab_Cr_C,
(mwArray)Matlab_SigT,
(mwArray)Matlab_UB_Model,
(mwArray)Matlab_FNo,
(mwArray)Matlab_LTimes,
(mwArray)Matlab_Hng) ;
}
catch( mwException& e2 )
{
csMess.Format("\n ERROR in DLL \n %s \n", e2.what() ) ;

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Walter Roberson
Walter Roberson 2011-8-16
Possibly "fid" is being constructed as a variable name and used in an eval() or feval() statement.
If .fig files are involved somewhere, the reference to "fid" could be buried in some property of a graphic, such as a callback.
The error message you see would be consistent with the possibility that some routine with a parameter named "fig" is being passed too few arguments.
Does diary() work in DLL's, I wonder?
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Walter Roberson
Walter Roberson 2011-8-17
Whether or not the compiler generated code for the "if 0" section, it would never _execute_ that code, so nothing in that code could have an effect.
I think what I would suggest at this point is to use the dependency analysis tool, and read through the results carefully looking for calls to routines you do not expect to be called, such as calls to something in a local library where you are expecting the MATLAB library to be called instead.
Bill
Bill 2011-8-18
Thanks Walter, seems to be the only way to go.
Is there any way to squeeze any more information out of the error message? Or is there a way to generate some sort of run-time log out while in the Matlab DLL? You mentioned diary() previously - but my reference to it says that it only records keystrokes.

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