How to change CDocument Variables from within the CWinApp derived Class?

[Franken]

Hi, I've written an application (SDI), which runs a thread in my derived CWinApp class. The thread is mainly for collecting data from a RS232 Interface. Sometimes I want to assign parts of this data to variables in my document class (for storing and displaying). How can I adress these variables? I know that it somehow works with the DocTemplate pointer m_pDocManager->GetFirstDocTemplatePosition() but I don't know the correct syntax. Can anybody give me a short introduction? Thanks for your help.

[David Crow]

The document can be accessed from anywhere like:

AfxGetMainWnd()->GetActiveDocument();

It can be accessed from the main application object like:

GetMainWnd()->GetActiveDocument();

---

"Take only what you need and leave the land as you found it." - Native American Proverb

[Franken]

Thanks for your help. But I still have a problem. GetActiveDocument() is not a member of CWnd. With GetMainWnd() I can only access GetActiveWindow(). What is my mistake? Do I have to do a type cast? I've tried the following: CFrameWnd* pFrame = (CFrameWnd*)GetMainWnd(); CMyDocument* pDoc = (CMyDocument*)pFrame->GetActiveDocument(); pDoc->myVariable = myValue; With this code I don't get a compile error but a runtime error;

[Franken]

Now it works :) somehow. The runtime error only occur if I try to place this code in the worker thread, not if it is placed somewhere else in the main application class. But I think I can find a solution for that. Thanks.

[David Crow]

Franken wrote:

GetActiveDocument() is not a member of CWnd.

Right, it's part of the frame.

Franken wrote:

With GetMainWnd() I can only access GetActiveWindow().

Not necessary in this case.

Franken wrote:

With this code I don't get a compile error but a runtime error;

Which is?

---

"Take only what you need and leave the land as you found it." - Native American Proverb

[David Crow]

Franken wrote:

Now it works somehow.

This is usually a good indication that the problem still exists and has simply been masked or moved to a new location.

Franken wrote:

The runtime error only occur if I try to place this code in the worker thread,

Which makes sense as worker threads shouldn't be accessing such information. See these two articles for more on threads and how they are supposed to communicate back and forth with the primary thread.* http://www.flounder.com/workerthreads.htm

• http://www.flounder.com/uithreads.htm

  ---

  "Take only what you need and leave the land as you found it." - Native American Proverb