Thread Subject: C++/MATLAB Progress Bar

I am calling a lengthy C++ program(dll) from MATLAB with the
calllib function. I would like to display a dialog box with
a progress bar that updates as the C++ program executes.
The length of time for the C++ program varies so I never
know how long it will take. I tried to create a progress
bar in C++, but I get a dialog box that pops up that says
:"An unsupported operation was attempted." There may be an
error in my C++ code, but everything compiled correctly. I
wanted to know if this type of operation of creating a
progress bar in C++ a program called by MATLAB is even
possible. Or if anyone has any good ideas please let me
know. Thanks.

"Sean Larkin" <slarkin71278@sbcglobal.net> wrote in message
<g5qr3h$2la$1@fred.mathworks.com>...
> I am calling a lengthy C++ program(dll) from MATLAB with the
> calllib function. I would like to display a dialog box with
> a progress bar that updates as the C++ program executes.
> The length of time for the C++ program varies so I never
> know how long it will take. I tried to create a progress
> bar in C++, but I get a dialog box that pops up that says
> :"An unsupported operation was attempted." There may be an
> error in my C++ code, but everything compiled correctly. I
> wanted to know if this type of operation of creating a
> progress bar in C++ a program called by MATLAB is even
> possible. Or if anyone has any good ideas please let me
> know. Thanks.

Try the "waitmex" function on the File Exchange at MATLAB
central. Unsure if it will work in the context of calllib,
though.

"Sean Larkin" <slarkin71278@sbcglobal.net> wrote in message
<g5qr3h$2la$1@fred.mathworks.com>...
> I
> wanted to know if this type of operation of creating a
> progress bar in C++ a program called by MATLAB is even
> possible.

Yes, I have programmed a C program that computes in the long
for-loop and call a MATLAB post-processing routine at each
iteration. The MATLAB routine takes care of the waitbar. It
works.

mxArray *rhs[narg];

/* ... */

for (i=0; i<niter; i++)
{
  mexCallMATLAB(0, NULL,
     narg, rhs, "PostProcessingStepFun");
}

%%

function PostProcessingStepFun(varargin)
  % ... initialize/update waitbar_h and x
  waitbar(x, waitbar_h);
  % ...
end

% Bruno