C / C++ / MFC

PostThreadMEssage from one process to another non GUI process

25-Jan-07 17:30

Have you stepped through with the debugger to see where it's failing?

Lots of good info and sample code here: Using Dialog Boxes[^]

Re: create dialog

prasad_som25-Jan-07 16:54

prasad_som

25-Jan-07 16:54

ng4kau1 wrote:
set_dlg =CreateDialog( GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_SETTING),hwnd, DlgProc) ;

Here, you have passed same address of diloag procedure(DlgProc), from which this dialog is supposed to invoke. Why it is so ?

What is not working in this code ? Have you tried to debug the code ? Is is comming in case IDC_SETTING ? Is set_dlg is non - null ?

Prasad
Notifier using ATL | Operator new[],delete[][^]

A_L25-Jan-07 13:12

A_L

25-Jan-07 13:12

Hi,

I have 2 applications, A.exe and B.exe, that have the following
interaction.
A's job is to start and kill B. (LaunchProcess to start and sending
WM_QUIT to kill)

Now I need B to log that shut off, meaning I want A to notify B that it
is going to kill it and I need B to log that info before it receives
the WM_QUIT.

B is a no GUI app, it has a WinMain which does some configuration work
and then calls RunMessagePump, which is also part of my code and it
looks like this :
inline WPARAM RunMessagePump() {
// Run the usual Windows message loop.
MSG msg;
while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;

}

WM_QUIT is sent using PostThreadMessage and as far as I understand I
can not use PostMessage since B does not have any windows.

So I did some web research for PostThreadMessage and it seems like if I
send such msg to a windowless app than DispatchMessage can not handle
that since it does not know what to do with the message and it is
advised to write a thread specific hook, meaning define a callback
function, call setwindowshandler to set the callback and do all my
logging in the callback func.
However, what I do not understand is why changing the RunMessagePump
wont work, its in my code and I can change it. I tried it out and I
never receive the WM_MYMESSAGE, only the WM_QUIT, at least GetMessage
does not return that. One more thing I am concerned about is that the
MSDN documentation says that for messages WM_USER and up I need to
write my own custom marshalling. What does that mean ? What do I need
to write besides the thread-specific hook ?
Also, this all seems really complicated and delicate - any other way I
can let B know that it is going to die soon and therefore it needs to
do some special logging ?

--
Thank you!

Re: PostThreadMEssage from one process to another non GUI process

Michael Dunn25-Jan-07 14:07

Michael Dunn

25-Jan-07 14:07

You could use a message-only window[^] in B, that way A could do a normal PostMEssage or SendMessage to that window to do the communication.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Ford, what's this fish doing in my ear?

Re: PostThreadMEssage from one process to another non GUI process

Blake Miller29-Jan-07 4:21

Blake Miller

29-Jan-07 4:21

The second process could watch for a specific event to be set, then use MsgWaiForMultipleObjects instead of your GetMessage() as the blocking call.

System Menu Weirdness

#realJSOP25-Jan-07 11:03

25-Jan-07 11:03

VS2005 (NOT with SP1)/MFC

When I add the OnSysCommand message handler to my app (without adding anything to it), the system menu starts acting weird. The left mouse button no longer displays the menu, and the right mouse button positions it incorrectly. On top of that, I can't resize the main window by click/dragging the border, and I can't move the window.

If I remove the OnSysCommand handler, the app behaves normally.

Has anyone ever seen that? Remember, I'm using the un-patched VS2005 with MFC.

I don't recall that happening in VC6.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Mark Salsbery25-Jan-07 11:10

25-Jan-07 11:10

John Simmons / outlaw programmer wrote:
When I add the OnSysCommand message handler to my app (without adding anything to it),...

Are you calling the base class OnSysCommand()?

Mark

#realJSOP25-Jan-07 11:51

25-Jan-07 11:51

Yes. It's a naked function, exactly the way the IDE gave it to me when I added the handler.

toxcct25-Jan-07 11:22

toxcct

25-Jan-07 11:22

any chance to see a piece of code John ?

Don't know where to start ?
Refer the Forums Guidelines and ask a friend

[VisualCalc 3.0][Flags Beginner's Guide]

#realJSOP25-Jan-07 11:51

25-Jan-07 11:51

If you have an app handy, add a handler for OnSysCommand, and that's what I have.

Michael Dunn25-Jan-07 11:39

Michael Dunn

25-Jan-07 11:39

Sounds like your handler is eating SC_MOVE and other SC_* commands that are generated when you use the window-management commands.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

Ford, what's this fish doing in my ear?

#realJSOP25-Jan-07 11:52

25-Jan-07 11:52

All SC_* commands are being passed on to the base handler.

#realJSOP26-Jan-07 2:45

26-Jan-07 2:45

Check this out - I posted it today:

http://www.codeproject.com/menu/System_Menu.asp[^]

30-Team League

compmaniac25-Jan-07 9:58

25-Jan-07 9:58

I'm trying to create a program that will, in a 30-team league, assign each team to play 6 times each against 17 teams, and 5 times each against 12 teams.

Before you read my code, you should be warned that I'm a bad coder, so if you could tell me how to organize my code better, thanks.

But my problem is that when I change this line: while(teamOpponents[a][randomMonth][randomDay] != 100 || teamOpponents[b][randomMonth][randomDay] != 100); to this line:

while(teamOpponents[a][randomMonth][randomDay] != 100 || teamOpponents[b][randomMonth][randomDay] != 100 || (randomMonth == 3 && randomDay == 9));

, the compiled program will halt (compile it yourself, and you'll see) (possibly in some kind of infinite loop(?)

My bad code:

http://www.codeguru.com/forum/showthread.php?p=1522813#post1522813

Mark Salsbery25-Jan-07 10:39

25-Jan-07 10:39

Looks like an infinite loop to me.

Mark

compmaniac25-Jan-07 10:47

25-Jan-07 10:47

Where? (after I put in the extra code)

Mark Salsbery25-Jan-07 10:56

25-Jan-07 10:56

What changes to cause this loop to stop?

while(randomMonth == 200 || randomDay == 200 || 
                 teamOpponents[a][randomMonth][randomDay] != 100 || 
                 teamOpponents[b][randomMonth][randomDay] != 100)
{
   randomMonth = rand()%6;
   randomDay = rand()%31;
}

compmaniac25-Jan-07 11:04

25-Jan-07 11:04

Look at all the code...also, try compiling my WHOLE script (from the link I provided).

I have an array teamOpponents[30][6][31]...meaning 30 teams, 6 months, and 31 days in each month (I'm trying to make the program not write to the 31st days of April, June, and September.)

All the values of teamOpponents[][][] have been set to 100. 100 means that the value has not been changed yet.

If the slot in the array has been changed (so the slot != 100), generate a new random month and day...

Mark Salsbery25-Jan-07 11:14

25-Jan-07 11:14

From what link?

I assumed the array elements were initially assigned to 100 based on the while statement's
expression.

Did I miss where you perhaps moved that closing curley bracket down (past where something in
the arrays actually gets changed? Smile | :)

Mark

compmaniac25-Jan-07 11:16

25-Jan-07 11:16

Sorry, I didn't understand your message, and this is the link:

http://www.codeguru.com/forum/showthread.php?p=1522813#post1522813

Mark Salsbery25-Jan-07 11:19

25-Jan-07 11:19

Here's what I got from the link. This code will get stuck in the while loop.
What have you changed to make this work?

for(int c = 0; c < amountofGames[a][b]; c++)
{
   randomMonth = 200;
   randomDay = 200;
   while(randomMonth == 200 || randomDay == 200 || 
                teamOpponents[a][randomMonth][randomDay] != 100 ||
                teamOpponents[b][randomMonth][randomDay] != 100)
   {
      randomMonth = rand()%6;
      randomDay = rand()%31;
   } 
                 
   // Store Dates in Array            
                     
   teamOpponents[a][randomMonth][randomDay] = b;
   teamOpponents[b][randomMonth][randomDay] = a;
                
   random = rand()%2;
                
   if (random == 0)
   {
      home[a][randomMonth][randomDay] = 1;
      home[b][randomMonth][randomDay] = 0;
   }else
   {
      home[a][randomMonth][randomDay] = 0;
      home[b][randomMonth][randomDay] = 1; 
   }
 
   // End Store Dates in Array
}

compmaniac25-Jan-07 11:26

25-Jan-07 11:26

No, this code doesn't get stuck at all...it won't get stuck until I change

while(randomMonth == 200 || randomDay == 200 ||
teamOpponents[a][randomMonth][randomDay] != 100 ||
teamOpponents[b][randomMonth][randomDay] != 100)

to

while(randomMonth == 200 || randomDay == 200 ||
teamOpponents[a][randomMonth][randomDay] != 100 ||
teamOpponents[b][randomMonth][randomDay] != 100 ||
(randomMonth == 3 && randomMonth == 9))

I assigned the value 100 to all the parts of the array.

So, if the array value isn't 100 (which means that it HAS been altered), keep generating a randomMonth and randomDay until the value of a DIFFERENT teamOpponents[a][randomMonth][randomDay] is 100 (meaning it hasn't been altered.)

Sorry if this is confusing, but if you have time to read the entire script, you might understand.

Thanks for your help though, any other ideas about why adding one conditional will cause it to halt?

Mark Salsbery25-Jan-07 11:37

Re: 30-Team League [modified]

25-Jan-07 11:37

Ok let me get my head out of my... disregard the previous infinite loop stuff.

This is what I got from the link, right?

for(int c = 0; c < amountofGames[a][b]; c++)
{
   randomMonth = 200;
   randomDay = 200;
 
   // fails (halts)
   if(randomMonth == 3 && randomDay == 9) 
      randomMonth = rand()%6; 
   randomDay = rand()%31;
   // fails (halts)
 
   while(randomMonth == 200 || randomDay == 200 || 
                teamOpponents[a][randomMonth][randomDay] != 100 ||
                teamOpponents[b][randomMonth][randomDay] != 100)
   {
      randomMonth = rand()%6;
      randomDay = rand()%31;
   } 
                
   // works (doesn't halt)
   if(randomMonth == 3 && randomDay == 9) 
      randomMonth = rand()%6; 
   randomDay = rand()%31;
   // works (doesn't halt)
 
   // Store Dates in Array            
                     
   teamOpponents[a][randomMonth][randomDay] = b;
   teamOpponents[b][randomMonth][randomDay] = a;
                
   random = rand()%2;
                
   if (random == 0)
   {
      home[a][randomMonth][randomDay] = 1;
      home[b][randomMonth][randomDay] = 0;
   }else
   {
      home[a][randomMonth][randomDay] = 0;
      home[b][randomMonth][randomDay] = 1; 
   }
 
   // End Store Dates in Array
}

compmaniac25-Jan-07 11:43