linking a dll with loadlibrary "specified module could not be found" error
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Hi, I'm trying to use loadlibrary to link a .dll to matlab (rather than using the mex compiler). I received from a vendor comes with the following header (it already had the extern "C" command, but I've modified it to include #ifdef __cplusplus as recommended). I'm currently using matlab 2014b, (32 bit). I have visual studio 2013 professional on my machine.
loadlibrary('IRIS_API'); returns the following...
In C:\Program Files (x86)\MATLAB\R2014b\toolbox\matlab\general\loadlibrary.p>loadlibrary at 359
In loadAPI at 3
Error using loadlibrary (line 440)
There was an error loading the library "C:\Users\jmcmullen\Documents\Data\20160928 - IRIS
API\IRIS_API.dll"
The specified module could not be found.
The header file is below. Any help would be greatly appreciated.
Thanks Jesse
#ifndef IRIS_API_included
#define IRIS_API_included
#ifndef IRIS_EXPORT // Compiling a user of IRIS
#define IRIS_EXPORT __declspec(dllimport) // For Microsoft Visual Studio
#endif
#ifdef __cplusplus
extern "C" { // Prevent C++ name-mangling (for other compilers)
#endif
// Must be called very early
IRIS_EXPORT void IRIS_InitAll(HWND mainHWnd);
// Must be called very late
IRIS_EXPORT void IRIS_ExitAll();
IRIS_EXPORT int signInUser();
IRIS_EXPORT void onMenuSystem();
IRIS_EXPORT bool signOut(CString sUser);
IRIS_EXPORT bool changeSuperPswd();
IRIS_EXPORT bool changePswdCurrentUserPswd();
IRIS_EXPORT bool changePswdHomingPswd();
IRIS_EXPORT bool signInChangeUser();
IRIS_EXPORT bool deleteUser();
IRIS_EXPORT bool userManagementSetCurrentProjectsDir();
... %more functions
#ifdef __cplusplus
}
#endif
#endif // IRIS_API_included
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Answers (2)
Pico Technology
on 7 Oct 2016
Edited: Pico Technology
on 10 Oct 2016
Hi Jesse,
Assuming this is your header file name, try:
loadlibrary('IRIS_API.dll', 'IRIS_API.h');
Is the IRIS_API dll 32-bit or 64-bit?
You may also need to configure a C compiler using
mex -setup
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Philip Borghesani
on 10 Oct 2016
That error is frequently the result of some other dll being missing from your system or otherwise failing to load. I recommend running MATLAB from the dependency walker program and looking at the results for dlls that failed to load.
- Dependency walker may already be on your machine it ships with many versions of Visual Studio and other Microsoft toolkits.
- Open file ...\matlab\bin\win32\matlab.exe
- Start profiling (default options should be ok, Full file paths might be helpfull)
- When matlab is up clear the log window (optional but helpfull)
- Load your library from MATLAB and look in the log for dlls that failed to load and reason why.
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