MFC parallel function

Question

0.00/5 (No votes)

See more:

I have class and that's like this

class mySample
{
  Cobject * cloneNode;
  std::list<Cobject *>cloneList;

}

and parallel processing as following code.
But It only executes when there is only one cbobject.
if clonelist have two or more... OnPlay function doesn't work.

function OnPlay(bool status, const CString& str ){

   if(pDC==NULL){
       CMainFrame * pFrame = (CMainFrame*)AfxGetMainWnd();
       CChildFrame *pChild = (CChildFrame*)pFrame->GetActiveFrame();
       CButterFlyEditorView *pView = (CButterFlyEditorView*)pChild->GetActiveView();
   ...

}

VStudio says
pChild 0xccccccc{hWnd=???}
pFrame 0x00000000<null>
this 0x0984f...{hWnd=0x000000<null>}

Can you advise me?
thanks for your time.

What I have tried:

parallel_for_each(CloneList.begin(), CloneList.end(), [&](Cobject* cloneNode) {
    cloneNode->OnPlay(file_status, m_ PathName);
});

Posted 13-Nov-17 15:43pm

Chopin2001

Updated 13-Nov-17 20:38pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

KarstenK · Accepted Answer · 2017-11-13T20:38:00

The explanation is already in your post: pFrame 0x00000000

Reading the documentation is always a good idea. In the text of AfxGetMainWnd you may had read

"If the function is called from a secondary thread in the application, the function returns the main window associated with the thread that made the call."

And your created threads have NO main window.

You must make the needed values from the primary thread as input parameters of your threading function. Windows is an operating system as iOS too) that run primary in the main thread. So it is never a good idea to access system elements from other threads. This ALWAYS needs excellent implementation.