Calling library problem

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Perron Jonathan
Perron Jonathan 2011-3-10
评论： ludwig law 2017-5-5
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);

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采纳的回答

Kaustubha Govind
Kaustubha Govind 2011-3-10
Why do you define libname as:
libname=strtok(hfile,'.');
The original code says:
libname=strtok(dllfile,'.');

更多回答（1 个）

Perron Jonathan
Perron Jonathan 2011-3-10
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] ?
  1 个评论
Walter Roberson
Walter Roberson 2011-3-10
perhaps you are looking for fileparts() to extract just the name ?

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