Try to get data saved from a file scope with Microsoft .Net Framework functions, but just recieve zeros

Hey everybody,

I've added a filescope to my target application using the functions of Microsoft .Net Framework and of cause added a filesystem object, fileinfo Object and so on, as code below shows. After the copytohost advice I get a new file with cryptic text at the root-path, but after converting the data with Matlab there are only zeros, where datavalues should be. Can anyone help me to get the real datavalues?

            mem = XPCTargetPC1.FileSystem
            drvinfo = mem.GetDrives
            directory = mem.CreateDirectory("C:\ExpData")
            mem.SetCurrentDirectory("C:\ExpData")
            sysinfo = directory.GetFileSystemInfos
            files = directory.GetFiles
            fscope_sig = fscope.Signals
            ftime_sig = fscope_sig.Add(app_time)
            ftet_sig = fscope_sig.Add(app_tet)
            freal_sig = fscope_sig.Add(aout_real)

            If files(0).Exists Then
                files(0).CopyToHost("root\Data.txt")
            End If

Answer 1

[Shiva Arun Kumar]

Hi Svenja,

The commands to read the data from a file created using the File Scope ,from within MATLAB, are:

file=xpctarget.fs;
h=file.fopen('d.txt');
data=file.fread(h);
file.fclose(h);
file = readxpcfile(data);

(In this case the data is being read directly from the target file system. Similar fopen/fread commands can also be used on files that have been copied onto the host computer)

http://www.mathworks.com/help/toolbox/xpc/ref/readxpcfile.html

The data can also be read from with .NET: Ex:

xPCFileScopeSignal fscsig = fscsigs["Unit Delay"];
xPCDataFileScSignalObject fscDObj = fscsig.FileScopeSignalDataObject;
double[] scData = fscDObj.GetData();

Since you are adding the scope to the application after it has been downloaded onto the target, please be sure to start the scope before starting the application.

Hope this helps, Shiva