how to use fopen in this situation?

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Hi I have created a Function like the following function, the function acceopts a Text file name as input. I want to open this text file with fopen, but it seems it is not possible. what can I do? here is the function:

function myfunction =rob2xml

prompt={'Textfilename.txt(Ex:test1.txt)'};

dlg_title='Joint values;

num_lines=1;

def= {'test1.txt',};

ts = inputdlg(prompt,dlg_title,num_lines,def);

%Now when i write ts in matlab command line I have %ts='test1.txt'

fid=fopen(ts)

RP=textscan(fid,'%*s %*s %s %*s %*s %s','delimiter',',');

fclose(fid);

but it seems that fopen does not work in this way and i should write the name of file in string format, but because i have to change the input file, what shall i do? and i have this message: ??? Error using ==> textscan First input can not be empty. Error in ==> testmeisam at 20 RP=textscan(fid,'%*s %*s %s %*s %*s %s','delimiter',',');