Calling library problem

Hello, I am currently working on importation of .tdms files (obtained with Labview) and I'm meeting some scripting problems. Indeed, I was working on a modified version of their "Matlab TDMS example" (that can be found here : http://zone.ni.com/devzone/cda/epd/p/id/5957), and i met the following issue: From the original version, I meet no problem for calling a library, but in my version, I have this message :

??? Error using ==> calllib Library was not found

Error in ==> ReadFile_trololo at 44 [err,dummyVar,dummyVar,file]=calllib(libname,'DDC_OpenFileEx',Data_Path,'',1,fileIn);

Error in ==> run at 57 evalin('caller', [s ';']);

I had understood that my libname variable is not correct, but I don't see how I can fix this issue. For informations here is the original part of the NI file :

%Check if the paths to 'nilibddc.dll' and 'nilibddc_m.h' have been

%selected. If not, prompt the user to browse to each of the files.

if exist('NI_TDM_DLL_Path','var')==0 [dllfile,dllfolder]=uigetfile('*dll','Select nilibddc.dll'); libname=strtok(dllfile,'.'); NI_TDM_DLL_Path=fullfile(dllfolder,dllfile); end if exist('NI_TDM_H_Path','var')==0 [hfile,hfolder]=uigetfile('*h','Select nilibddc_m.h'); NI_TDM_H_Path=fullfile(hfolder,hfile); end

%Prompt the user to browse to the path of the TDM or TDMS file to read [filepath,filefolder]=uigetfile({'*.tdm';'*.tdms'},'Select a TDM or TDMS file'); Data_Path=fullfile(filefolder,filepath);

%Load nilibddc.dll (Always call 'unloadlibrary(libname)' after finished using the library) loadlibrary(NI_TDM_DLL_Path,NI_TDM_H_Path);

%Open the file (Always call 'DDC_CloseFile' when you are finished using a file) fileIn = 0; [err,dummyVar,dummyVar,file]=calllib(libname,'DDC_OpenFileEx',Data_Path,'',1,fileIn);

And here is what I have done :

%Path of the nilibdcc.dll and nilibdcc_m.h Trololopath= 'C:\Program Files\MATLAB\R2010b'; hfile = [Trololopath '\extern\include\nilibddc_m.h']; dllfile = [Trololopath '\bin\win32\nilibddc.dll']; libname=strtok(hfile,'.'); loadlibrary(dllfile, hfile);

% attribution of libname libname=strtok(dllfile,'.');

%Prompt the user to browse to the path of the TDMS file to read [filepath,filefolder]=uigetfile('*.tdms'},'Select a TDMS file'); Data_Path=fullfile(filefolder,filepath);

%Load nilibddc.dll (Always call 'unloadlibrary(libname)' after finished using the library) loadlibrary(dllfile,hfile);

%Open the file (Always call 'DDC_CloseFile' when you are finished using a file) fileIn = 0; [err,dummyVar,dummyVar,file]=calllib(libname,'DDC_OpenFileEx',Data_Path,'',1,fileIn);

Answer 1

[Kaustubha Govind]

Why do you define libname as:

libname=strtok(hfile,'.');

The original code says:

libname=strtok(dllfile,'.');

[ludwig law]

right ans.

Answer 2

[Perron Jonathan]

Oops, indeed, it is. I had fix that point since then, but I still got have my problem. I think I have found from where is coming the problem. When I execute the original version, libname takes the value "nilibddc", but when I execute my version, libname takes "C:\Program Files\MATLAB\R2010b\bin\win32\nilibddc". I tried several things, including libname = 'nilibddc', but it is still not working. So, I guess that this is because of the lines :

[dllfile,dllfolder]=uigetfile('*dll','Select nilibddc.dll');

libname=strtok(dllfile,'.');

When I run the original code, dllfile takes the value "nilibdcc.dll" and dllfolder, the path of the folder, so it explains me why libname take the value "nilibdcc". But, in my code, I don't want to use uigetfile,so is there another function with the same way to use [dllfile,dllfolder] ?

[Walter Roberson]

perhaps you are looking for fileparts() to extract just the name ?