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WinExec running in parallel?

Posted on 1997-03-25
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Last Modified: 2013-12-03
I need to run a small DOS application in my Win 3.1 c++ program(MS c++ 1.52).  I'm using WinExec to do this.

My problem is that the line following the WinExec is an if/then statement that relies on a file that the DOS program might or might now create.  IF the DOS program created the file it does one thing, else another.

What it seems to be doing is running both my program and the DOS application in parallel(Win 3.1 definition of parallel:)).  I mean, it seems to be getting past the if/then statement before the DOS application has time to finish and write its output file.

Is there any way to stop the swapping of resources in windows so it only runs the DOS application?  So it runs lineraly?  I've tried several things including a pif file for my DOS application with priorities set to max(10000).

Thanks for any ideas!
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Question by:mojo666
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chensu earned 450 total points
ID: 1334219
There is no standard way to do so. However, you can use the following code that I used it for the similar purpose. It works fine.

// You should set the PIF to allow DOS programs background running.
::WinExec("ATTRIB c:\\windows\\*.*", SW_MINIMIZE);

// wait until the DOS program ends
while (::FindWindow("tty", "ATTRIB.EXE") != NULL ||  // for Windows 95
       ::FindWindow("tty", "ATTRIB") != NULL)        // for Windows 3.x
{
    // yield the control to let DOS run
    MSG msg;
    while (::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
    {
        ::TranslateMessage(&msg);
        ::DispatchMessage(&msg);
    }
}

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