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Hi
I have created a console application (.exe), and we have used SetConsoleCtrlHandler for signal handling i.e. "CTRL + C" and Log Off and Shutdown Events.
We are properly able to handle the "CTRL+C" event but Logoff and Shut down events cannot be handled properly.
Following content is mentioned at MSDN:
========================================================
The system generates CTRL_CLOSE_EVENT, CTRL_LOGOFF_EVENT, and CTRL_SHUTDOWN_EVENT signals when the user closes the console, logs off, or shuts down the system so that the process has an opportunity to clean up before termination. Console functions, or any C run-time functions that call console functions, may not work reliably during processing of any of the three signals mentioned previously. The reason is that some or all of the internal console cleanup routines may have been called before executing the process signal handler.
========================================================
Please suggest how we can properly handle Logoff and shutdown event by our console application.
Or please suggest any other technique (if available) for handling the logoff and shutdown event by the console based application.
Thank You
Ashish Kumar verma
Software Engineer(VC++)
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You need to show the code where you test for these conditions; maybe you are doing something wrong.
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In .NET we have the System.IO namespace providing convenient classes for Sockects and Pipes which ay be used for interprocess communication. How can one implement this in oldskool VC6?
My requirements are as follows.
I am writing a plugin for some legacy software for which there is a SDK which I can only get to compile with VC++6.0 compiler. I want to interface this code with both .NET and JAVA. I was thinking of implementing either a Socket server or Namedpipe in C# to act a a bridge between the VC6 code and .NET/JAVA. Requests from VC6 would be in the form of byte[] arrays and the C# bridge would interpret these requests, route them and eventually reply to the VC6 code which is awaiting a response.
In summary I would like examples of the following in VC++6:
- Use of threads
- Socket/Pipes (or any other interproc comms method)
- Invoking a process (other than a shell call to an executable)
BTW non-MFC is required
Any suggestions would be great.
Best, Y
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Thanks Superman,
Exactly what I wanted. Whenever I search msdn I seem to find it have to get relevant results. my only realy experience it with .NET/JAVA and therefore when looking I'm a little non-plussed when it comes to C++/MFC and what is possible.
Great
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If you want to simplify things, rather than use the sockets or named pipes, you might consider these two other options for the .NET part:
1) C++/CLI to generate a bridge DLL from the C# code that loads and runs the VC 6 DLL.
2) PInvoke from C# to load and run the VC 6 DLL.
For the Java part, you might do the process execution or use one of the Java - .NET bridges that exist out there.
Just some other suggestions to consider.
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I would like to display a text status in MFC main frame from anywhere from my code.
I am using standard MFC CStatusBar indicators
static UINT indicators[] =
{
ID_SEPARATOR, // status line indicator
ID_STATUS_00,
ID_INDICATOR_CAPS,
ID_INDICATOR_NUM,
ID_INDICATOR_SCRL,
};
and in main frame message map
ON_UPDATE_COMMAND_UI_RANGE(ID_STATUS_00,ID_STATUS_99, OnUpdateRange)
The processing function is defined , per MSDN
void CMainFrame::OnUpdateRange(CCmdUI *pCmdUI)
When I test post the last message in range
PostMessage(ID_STATUS_99);
the OnUpdateRange gets executed , however, I do not know how to retrieve the correct range message from CcmdUI.
Any help will be greatly appreciated.
Cheers Vaclav
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pCmdUI->m_nID will give you the ID
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That is what I thought ( found in documentation) , but it is always the ID of the first message in range.
What is odd - the ON_UPDATE_COMMAND_UI_RANGE function gets executed initially and so far I do not know why.
As long as this is how it suppose to work I'll just keep on debugging to find out what I missed.
Thanks for your help.
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Vaclav_Sal wrote: PostMessage(ID_STATUS_99);
Should that not be
PostMessage (WM_COMMAND, ID_STATUS_99) ?
I presume that you are updating some sort of progress report, in which case I'd recommend just posting a registered window message to your main frame, and letting a message handler there deal with it, rather than handling 100 different messages.
ie:
PostMessage (CMainFrame::g_rwm_UpdateStatus, nProgress, nProgressMax);
CMainFrame
{
....
static UINT g_rwm_UpdateStatus;
...
UINT CMainFrame::g_rwm_UpdateStatus = ::RegisterWindowsMessage (_T("CMainFrame::g_rwm_UpdateStatus"));
...
ON_REGISTERED_MESSAGE(g_rwm_UpdateStatus, OnUpdateStatus)
...
and so on. You don't have to have the message number in the header - you can have many calls to RegisterWindowsMessage in many parts of your code, you just have to use the same string name each time. I use the class/member variable, but you could also use a GUID. Just make sure to comment for your future self.
In another note, when you're debugging Update handler, you can always walk up the call stack to see why you're getting parameters that you do.
Good luck,
Iain.
I am one of "those foreigners coming over here and stealing our jobs". Yay me!
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Thanks Iain.
It just bugged me, I kept thinking there got to be some “index” somewhere to keep track of the range.
So – I made three major mistakes -
I have no clue why I thought PostMessage(ID_whatever) would work.
Second mistake and third – I thought the the MFC will route the message thru main frame first.
So if I do PostMessage(WM_COMMAND, ID_STATUS_99) it works only when posted in main frame.
I'll admit – most of the time I just do not understand how MFC routes the messages!
In this “case” I have a Cview in splitter and maybe that is the “problem”.
I guess I need to look it up somewhere , again!
I was planning to have the actual text in the function which updates the status text.
Anyway – I'll take a look at registered message as you suggested.
Cheers
Vaclav
In the mean time I cheated this way
AfxGetMainWnd()->PostMessage(WM_COMMAND ,ID_STATUS_99);
but there is still a problem - the status update is called when anything is updated ( duh) and the text goes back to the first index in range.
Working on that. Perhaps static text variable will do.
-- modified 24-Jan-13 11:47am.
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I would recommend against using WM_COMMAND for your status update message, and go for the registered window message:
1/ It saves command collision
2/ MFC does a LOT of work routing command messages about. This is one of its great strengths, and makes many things nice and elegant, but it can be confusing too.
3/ As long as you use the same string id for the message, you don't have to share header files, making code independence a bit cleaner.
Doing AfxGetMainWnd()->PostMessage is not cheating at all! Just change from WM_COMMAND and I'll be happy with you.
As you why the status bit is being reset? No idea, that will depend on the details of your code. I bet your command handler is being called from places you didn't expect. (See point 1 above).
Iain.
I am one of "those foreigners coming over here and stealing our jobs". Yay me!
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I wrote one application. The main frame is a form without border. So it donot have the task bar mouse click function. The first mouse click on the application icon in the task bar, the application will hide. The second mouse click, this application will show.
After I debug in the OnActiveApp, I find that sometime one OnActiveApp called, the other two OnActiveApp called when use mouse click the taskbar icon. How to filter the useless OnActiveApp event?
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What is it that you're trying to do?
If you want the alter the minimize and restore operations that happen when you click on the task bar button, handle the WM_SYSCOMMAND message and check for SC_MINIMIZE and SC_RESTORE in its wParam argument.
You then simply return 0 to prevent the default action from being performed.
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I tryed it. But when click there is no message can be accepted in the mainframe.
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hi all,
i like the left side panel view of control panel in windows 7.
is this possible to use or draw this type of panel in dialog based application?
if yes please help me from where i can start for this?
thanks in advance.
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what about its glassy effect?
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i already work with aero glass theme, and DWM (Desktop Window Manager)
Use DwmExtendFrameIntoClientArea and other function for aero glass theme and its works.
but this works only when aero theme and its drier properly istalled.
but the glassy look of list box with sys links (left panel) of the control panel looks glassy even aero theme is available or not.
so how can i draw this even aero theme is not available .
thanks.
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VCProgrammer wrote: so how can i draw this even aero theme is not available .
Sorry, I don't know about that one. Try searching the articles section to see if there are any suggestions there.
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Pardon me!! I am new here. I am unable to use addNode function. When i declare Node* it doesnt compile.
I am trying to implement a linked list in c++ without
using structures and only use pure classes.I am rusty here. Any help would be great.
head->addNode() and head.addNode() doesnt work.
#include<iostream>
#include<cstdlib>
using namespace std;
class Node
{
int data;
Node* next;
public:
Node()
{
data=0;
next=NULL;
}
void addNode(int a)
{
if(this!=NULL)
{
data=a;
next=NULL;
}
}
};
void main()
{
Node* head;
head.addNode(10);
}
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addNode is not a member of the Node class.
class Node
{
public:
void addNode(int a);
};
void Node::addNode( int a )
{
}
your addNode is not good, you need to think things over; you do not allocate a new node; you do not assign the next pointer ...
I find that using free functions instead of class methods makes things easier when doing this; a node only contains the data (and the next pointer).
if all fails, use std::vector.
Good luck.
Nihil obstat
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void main()
{
Node* head;
head.addNode(10);
}
Create the object in the heap first. You just declared a variable stating "I will hold address of Node object in a variable head". But, where does that object? When there is no object head-> will not work. Head.addNode() also wont work as the object is not in stack.
Correction:
void main()
{
Node* head = new Node();
head->addNode(10);
}
Object will be created in heap.
or
void main()
{
Node head;
head.addNode(10);
}
Object will allocated on stack
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I try to change CScrollBar's interface (MySkinScrollbar is delivered MFC's CScrollBar).
I loaded image to draw over the windows's classic interface -> It's done.
But when I click on "UpArrow" button in ScrollBar. The windows's classic interface is drawn over my image.
I think I should catch WM_LBUTTONDOWN and WM_LBUTTONUP message to redraw (calling Invalidate()).
I'm success in catching WM_LBUTTONDOWN message.
But I can't catch WM_LBUTTONUP message.
Please help me to solve this problem!
You can search with key word "//Why don't show message ?????". Jump to my problem.
This is my project (use VS 2003):
Download Project
By the way, please tell me the way to reset default the Visual Studio 2003 (like has just installed)!
Thanks for all !!!!!
(I'm Vietnamese. So my English is not good. If I make some mistakes, please help me out.)
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