calllib fails even though it sees function

I used libfunctionsview to view the functions in a library I've loaded.

I see the function that I want to call correctly displayed but when I call it, I get:

Undefined function or variable 'DLL_ValIncrement'.

[Philip Borghesani]

How exactly are you trying to call this and what arguments are you passing in? Please post a code fragment with the full error message.

[Tom Lawson]

Thanks for the response, but I had left for the weekend.

Here is what my Matlab looks like:

Trial>> loadlibrary ('testDLL', 'testDLL')

Warning: Warnings messages were produced while parsing. Check the

functions you intend to use for correctness. Warning text

can be viewed using:

 [notfound,warnings]=loadlibrary(...)

> In loadlibrary (line 359)

Trial>> libfunctionsview testDLL_

Trial>> y = calllib('testDLL', DLL_ValIncrement)

Undefined function or variable 'DLL_ValIncrement'.

Here is what the header file looks like:

#include windows.h

#define BYTE unsigned char

#define BOOLEAN unsigned char

#define USHORT unsigned short

#define DOUBLE double

__declspec(dllexport) BOOLEAN DLL_DoNothingFunc(BYTE bVal, USHORT usVal, DOUBLE* dblArray);

__declspec(dllexport) BOOLEAN DLLDoMsg(void);

__declspec(dllexport) BOOLEAN DLL_ValIncrement(void);

and I've attached a screenshot showing the results of the call to

libfunctionsview testDLL

showing that all the functions in the DLL are seen correctly.

The use of [notfound,warnings]=loadlibrary(...)

shows a LOT of warnings (I didn't put them in here), but only ones

related to the Microsoft SDK that I downloaded from a link at the

Matlab website. There were no errors or warnings related to my DLL

which may be why it actually did load and showed the correct definition

of the functions within the DLL.

Just tried the Matlab suppled DLL and get the same problem:

Trial>> calllib('shrlibsample', printExportedDoubleValue, void)

Undefined function or variable 'printExportedDoubleValue'.

[Tom Lawson]

I figured it out - simple mistake - didn't have the function calls in quotes.