Advanced : Shell doesn't appear to be running asynchronously 
Author Message
 Advanced : Shell doesn't appear to be running asynchronously

In my previously experience Shell has normally always returned the process
id almost instantaneously.
However, recently I have come across two instances where it hasn't doesn't

The first time was when calling an exe, which added data to a database. The
ProcID didn't return until the code had finished
executing, which was a pain because I wanted to be able to abort the
execution if it took over a specified period of time.

The second time was when shelling the DLL to show the printer control panel

I couldn't get the 'Printer' Dialog to display unless I put a message box in
the calling code. i.e.:

    lRetVal = Shell(CommandLine, State)

    If lRetVal Then
        Sleep 200
        'Need to display a msgbox to pick up the windows handle of the DLL
        MsgBox "Install a Printer, then Close the dialog " & Chr(13) & "and
Compass will continue running...  ", vbInformation + vbSystemModal
        lRetVal = FindWindow("CabinetWClass" & vbNullString, ByVal

I actually wanted to use the Proc ID and then OpenProcess along with
WaitForSingleObject, to see when the window had closed, but I couldn't get
it to work??!!

This leads me to believe that the Proc ID isn't returned until a specific
message has been given from the called application, this seems to happen
a form or message box is displayed. Does anyone know how to force the Proc
ID to return at the start of execution????



Andrew Baker


Mon, 09 Dec 2002 03:00:00 GMT  
 [ 1 post ] 

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