suspend execution of a program

**majoub** · 07-28-2006

hi

I am searching for a way to suspend the execution of a C/C++ program.. I know there is the Sleep function but that only stops the program for a specified number of seconds...

what i need is a function that suspends the flow of control. then i need to reactivate the flow through some event.
take for example message boxes.. in any language when you pop up a message box the flow of control freezes until the user clicks some button on the message box and then the program resumes.. i need to do something similar

is that possible? or do i have to think about threads and mutexes?because i'm trying to avoid that..

if you need more clarification please ask me.

thank you

**Mario F.** · 07-28-2006

Yes... what are you trying to do?

**majoub** · 07-28-2006

well actually i'm trying to create my own message boxes..
and i need a way to stop execution of my program after the message box pops up and wait for user events. then resume the execution after the user clicks one of the message box buttons..

i'm using win32 by the way..

in VB i know that there is a stop function that does what i want.. i'm sure there must be a way in C/C++ also..

**Mario F.** · 07-28-2006

Message boxes have a modal attribute. I have no idea how this is implemented in C++ but it certainly is no much different from what VB does (assuming you are using the windows API to call your Message Box)

If you used stop() with your messages boxes in VB you were already doing it wrong.

**Osaou** · 07-28-2006

The most common way to wait for whatever is the following:

Code:

bool b_wait = true;

while(b_wait){
	// ...
}

Inside that loop you check if the user pushed your button, or whatever quota that needs to be fulfilled.

**majoub** · 07-28-2006

i already tried a while loop..
the program wont catch user events..it will get stuck in that infinite loop..

**CornedBee** · 07-28-2006

Write a message loop. That's exactly what modal dialog boxes do: they have their own message loop and only leave it when the dialog is dismissed.

Code:

while(GetMessage(&msg, ...) > 0) {
  if(!IsDialogMessage(hDlg, ...)) {
    ...
  }
  if(!dialogBoxActive) {
    break;
  }
}

There are some complexities involved in writing your own modal message loop, though. See this blog for some of the pitfalls:
http://blogs.msdn.com/oldnewthing/
Search for "modality". Consider especially this post and the follow-ups:
http://blogs.msdn.com/oldnewthing/ar...18/376080.aspx

**twomers** · 07-28-2006

As Osaou said:

Code:

bool StayInLoop = true;

while ( StayInLoop )
{
	// Do the message box thing
	if ( ReturnFromMB Indicates you break ) StayInLoop = false;
}

>> the program wont catch user events..it will get stuck in that infinite loop..
I don't see how

**CornedBee** · 07-28-2006

Originally Posted by twomers

I don't see how

The message box can't do anything without a message loop, ergo it won't ever go away or return or anything.

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