C / C++ / MFC

Re: how to find multiple instances of same top-level class name

16-Mar-09 6:48

Can some please tell me how to find multiple instances of same top-level class name. I have used FindWindow(), however it's only returning the first window it finds.

thanks a million.

«_Superman_»16-Mar-09 7:12

Re: how to find multiple instances of same top-level class name

16-Mar-09 7:12

You can enumerate all windows using EnumWindows.
Then use GetClassName on the window handle to get the name of its class.

«_Superman_»
I love work. It gives me something to do between weekends.

FISH78616-Mar-09 7:19

Re: how to find multiple instances of same top-level class name

16-Mar-09 7:19

Thank you.

FISH78617-Mar-09 17:35

Re: how to find multiple instances of same top-level class name

17-Mar-09 17:35

Superman, I am stuck between using EnumWindows and a hook. I have tried both. Here are my problems with both. I was avoiding to use hook because i am not as provicient yet to use, however if I can get it going with what I have so far, It will save me frustrations in the future. The reason I am avoiding it is I for now is I only need it to get my window captions and window positions of all windows open based on classname. I am way behind in this. If you can help with either I will appreciate it.
Hook Problem.
The Dll compiles fine. Not sure how to test it yet on its own.
User Inteface that goes with the hook compiles fine own its own and runs fine. However when I compile and run it with the header files included for the hook dll. I get a run time execution error. I changed the project to make it as a dependency when compiling. When I do that the user app is looking for a hookdll.lib file which I believe is for the dll's export which I can't find and not sure what options to change, even though I have the __desc(....dllexport) in there. So I am stuck there.
EnumWindows Problem.

I am using trying to use it when the user clicks the command button in the user application.
This is what I have so far and cant compile once i have this in the app.

void CUserAppDlg::OnBnClickedButton1()
{
	::EnumWindows(MyEnumProc, 0);
////Not sure if this is right?
	
	// TODO: Add your control notification handler code here
}
/////////
Not sure How to declare this. Getting compile errors on this too.

I have it in the app's header file in the public section as

BOOL CALLBACK MyEnumProc(HWND hWnd, LPARAM lParam);

the following is in the app's.cpp

BOOL CALLBACK MyEnumProc(HWND hWnd, LPARAM lParam)
{
      char title[500];
      GetWindowText(hWnd, title, sizeof(title)); 
      return true;

}

I sincerely appreciate all the help you have provided me with.

once again thanks a million.

«_Superman_»17-Mar-09 23:54

Re: how to find multiple instances of same top-level class name

17-Mar-09 23:54

It looks fine to me.
What is the error that you're getting?

«_Superman_»
I love work. It gives me something to do between weekends.

FISH78618-Mar-09 2:21

Re: how to find multiple instances of same top-level class name

18-Mar-09 2:21

Appreciate your help a lot.
When I use EnumWindows.

error C3867: 'CUserAppDlg::MyEnumProc': function call missing argument list; use '&CUserAppDlg::MyEnumProc'

When I use the hook without the dependency compiles and header included.

This is with the hook in the userapp: The application failed to initialize properly (0xc0000005).

Without the hook in the user app and no EnumWindows: the UserApp is fine.

DeBug Question:

When I am debugging my app. The debuger states that no sorce code found when it reaches the above error. Could this error be caused by one of the Header files I am using. e.g. or <regex.hpp> because if it is all I am using are the standard header files nothing fancy.
Thanks a million.

FISH78618-Mar-09 3:32

18-Mar-09 3:32

Well. I might have resolved this doing the following. Not sure where I went wrong with the first one.

I created a new userapp. Without inserting any codes compiled it to make sure it works. Well it worked.

Created a DLL project in the same solution as I had before this time instead of changing and entering anything. Compiled it and set the dependencies.

After setting the dependencies it compiled not asking for any lib files.

I changed the dll code to pop up a message and ran my user app. It worked fine.

So I have a template to work with. So If any errors I get will be my own.

Thanks again for all the help.

CWinThread Question

ForNow16-Mar-09 6:20

ForNow

16-Mar-09 6:20

Hi,

I starting a worker thread using a CwinThread object

In response to User info from a Dialog Box

After the thread a has retrieved the info what is the best way to notify the app/MainFame window

Save the main window object after creating it e.g CMainFrame were is CMainFrame

is the main CFrameWnd object and do a SendMessage to that object

Or save the Main Thread from CWinapp and PostMessage to that thread

Since the thread isn't really part of Dialog Window I guess can't do a CWnd::GetaParent

to get the main Cwnd object ???

I am just a MFC rookie so... any suggestion are welcome

«_Superman_»16-Mar-09 7:14

16-Mar-09 7:14

MFC has a function called AfxGetMainWnd to get the main window object.

«_Superman_»
I love work. It gives me something to do between weekends.

bulg16-Mar-09 7:33

bulg

16-Mar-09 7:33

Does this work if you call it from code in a DLL loaded by an MFC app?

ForNow16-Mar-09 12:55

ForNow

16-Mar-09 12:55

I dont know if you're question is refering to _Superman_ answer However in Win32 all DLL's are mapped into the same address space

so does that mean a process an only have one main window ?????

I guess I am internals rookie too as I work as a MainFrame programmer

«_Superman_»16-Mar-09 18:34