TDMS C DLL Error 6210 File is read only

[rohrs2]

I am trying to use VS2015 to extract data from TDMS files, however I am getting this error when I try to open the file.

6210

DDC_CannotWriteToReadOnlyFile

The file passed to the library is read only and cannot be modified.

This happens with both DDC_OpenFile and DDC_OpenFileEx.

ddcChk (DDC_OpenFileEx (FILE_PATH, "TDMS", false , &file));

ddcChk (DDC_OpenFileEx (FILE_PATH, "TDMS", true, &file));

ddcChk (DDC_OpenFileEx (FILE_PATH, "TDMS", 0, &file));

ddcChk (DDC_OpenFileEx (FILE_PATH, "TDMS", 1, &file));

ddcChk (DDC_OpenFile (FILE_PATH, "TDMS", &file));

Is there a way to open read only files in VS or change the access in VS before opening?

[AndreasK]

	ddcChk (DDC_OpenFileEx (filePath, "TDMS", 1, &file));

Works for me. It works for readonly and even for folders without write rights.

Is the NI Excel Addin capable to read the files?

Andreas

[rohrs2]

I can open the file in with the Excel Add-on.

Additionally a .log was created with this error

ERROR: TDS Exception in Initialize: Tds Error: TdsErrFileVersionTooNew(-2510):

[AndreasK]

The tdms_ebd.dll in you folder should be 2.5.0.49152.

Its included in the current download.

Is it possible to share a file if this is your version?

[rohrs2]

I apologize for the delay. Initially the files were not closing properly. However upon fixing this issue I still receive the "file is read only" error. Attached is the solution I am using which I obtained from these forums. The Test01-160711.tdms file is the file I am trying to open. This file does open on both matlab and excel.

[rohrs2 · Accepted solution]

The previous comments were correct, using an old dll package does not work. For everyone that is searching for the solution or how to set up tdms c dll in visual studios (VS 2015 here, Win32):

1) Grab the new c dll from the comment above.

2) Make a new blank win32 app project.

2) Move the contents of \c_dll_tdm\TDM C DLL\dev\bin\32-bit to working directory

3) Move \c_dll_tdm\TDM C DLL\dev\include folder to working directory

4) Move \c_dll_tdm\TDM C DLL\dev\lib folder to working directory

5) Move/copy contents of the \c_dll_tdm\TDM C DLL\samples\readFile.c code to your working directory/source file. (The variable length must be changed to an unsigned int for it to work with c++).

5) Follow these instuctions here to include your working directory (Step 7+). Add the working directory to your source file properties, but add the library to the Project properties

That did it for me I can successfully open TDMS files. Thank you for the help and link to new DLL! I hope this can help some people that are also new to VS.