C / C++ / MFC

Re: change mouse pointer for MainFram and dialog in MDI applicaion

2-Jun-09 21:17

It is not working in my current applicaion on which I am working,
I crated a new MDI applicaion and tried this to test, it is working fine

But I want the same to work in my application also, Please help

int i=0;

  SetCursor(LoadCursor(NULL, IDC_WAIT));
  while(i<500)
  {
  Sleep(10);
  i++;
  }
  SetCursor(LoadCursor(NULL, IDC_ARROW));

Chandrasekharan P2-Jun-09 22:04

Chandrasekharan P

2-Jun-09 22:04

Why will it not work for you in your application if its working with MDI? show the part of code where you are implementing it

Re: change mouse pointer for MainFram and dialog in MDI applicaion

ptr_Electron2-Jun-09 22:23

Re: change mouse pointer for MainFram and dialog in MDI applicaion

2-Jun-09 22:23

I used exactly same, but in my application I used in non MFC class,
which is having a Lengthy operationfucntion

and in my test appliaction I used ina OnButton() cmd handler.

Chandrasekharan P3-Jun-09 1:11

Chandrasekharan P

3-Jun-09 1:11

why dont you show that implementation?

Re: change mouse pointer for MainFram and dialog in MDI applicaion [modified]

ptr_Electron3-Jun-09 2:55

Re: change mouse pointer for MainFram and dialog in MDI applicaion

3-Jun-09 2:55

opps, sorry again , here is the correct one, Please advice

CSearchDlg::OnSearchBtn()
{
        CLengthyOper cls;
        cls.PerformLengthyOperation();

}

CLengthyOper::PerformLengthyOperation()
{
        SetCursor(LoadCursor(NULL, IDC_WAIT));
	
        //Some very time consumming call to the server
    
	SetCursor(LoadCursor(NULL, IDC_ARROW));
}

modified on Thursday, June 4, 2009 2:53 AM

ptr_Electron4-Jun-09 1:00

Re: change mouse pointer for MainFram and dialog in MDI applicaion

4-Jun-09 1:00

Can some one please help me out in this

gabbasb211-Aug-09 4:41

gabbasb2

11-Aug-09 4:41

You cannot expect the cursor to change while you have yourself blocked the message processing loop. For the cursor to change you must return and then let the message processing loop handle the cursor change message.
As far as I understand you need a separate thread for doing the time taking processing or do it in OnIdle
Hope this helps

CPropertyView Problems Compiling

wdolson1-Jun-09 17:52

wdolson

1-Jun-09 17:52

I have a project in which I was using a view using a CTabCtrl. I ran into some issues turning tabs on and off and my searching led me to the CPropertyView described here: Property Sheet View[^]

I am writing here because the article is old and probably not being maintained. The original was written for VC 6. I have compiled the demo projects just fine under both VC 6 and VC 2005.

When I included CPropertyView in my project and attempted to compile, I got three errors which are real head scratchers. In my class derived from CPropertyView, I get the following errors:

C2248: 'CPropertyView::GetThisMessageMap' : cannot access protected member declared in class 'CPropertyView'

C2352: 'CPropertyView::AssertValid' : illegal call of non-static member function
C2352: 'CPropertyView::Dump' : illegal call of non-static member function

The C2248 error comes up with the END_MESSAGE_MAP() macro. I tried commenting out everything in the message map and I still got the error.

I have carefully checked the syntax and AssertValid and Dump are declared and called identically in this class as in all others. There is a slight variation between VC6 and VC2005 in that VC2005 has an extra #ifdef for Windows CE, but the error happens whether the ifdef is there or not.

I found a Microsoft Knowledge Base article (Q243351) that talks about the C2248 error happening when the /Za flag is used in the compiler, but I'm not using that flag.

I'm sure the answer is something simple, but I've run into a brick wall.

Bill

Stuart Dootson2-Jun-09 2:06

2-Jun-09 2:06

Have you put a DECLARE_MESSAGE_MAP in your derived class?

[edit]Also - I presume you've inherited publicly from CPropertyView?[/edit]

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

wdolson2-Jun-09 21:29

wdolson

2-Jun-09 21:29

DECLARE_MESSAGE_MAP is there. I was tracking down another compiler error and stumbled across the problem. When I converted the class as derived from CFormView to CPropertyView, I had updated all the references to CFormView except 1. I don't know why the compiler didn't see that as a problem, but when I changed that, it compiled.

I'm having some other problems now. It appears that something in the parent class is causing a memory corruption in the derived class. It was blowing up when I tried to call Clear() for a COleVariant class variable. When I looked at it in the debugger, it was set to something strange. In the class declaration, I moved the COleVariant to the end of the fire and it ran Clear() fine. However, it now blows up when calling SetWindowText() for a CEdit variable.

Tracing down into the debugger, everything looks fine until

m_pCtrlSite->;SetWindowText(lpszString);

I try to trace into it, but I get an access violation reading location 0x00000000. The issue is almost certainly caused by something in CPropertyView because the program runs just fine through that point with the old TabView.

What tools are available to figure out what's corrupting memory?

Bill

Stuart Dootson2-Jun-09 21:39

2-Jun-09 21:39

wdolson wrote:
m_pCtrlSite->;SetWindowText(lpszString);

I hope that first semi-colon's just a typo in the message Smile | :)

First thing - I presume you're using a Debug rather than Release build for your debugging (strange things can appear to happen when you debug a Release build).

If it is a Debug build, try setting a Data Breakpoint on the thing that's changing unexpectedly - that should be triggered when the data changes value.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Hi Help me write this program (tuan1111)

wdolson2-Jun-09 22:03

wdolson

2-Jun-09 22:03

Yes, the semi-colon was a typo. When I copied and pasted the code, it turned the arrow head into > and I didn't delete the semi-colon.

It is also being debugged in debug mode. I was putting a breakpoint where it was changing unexpectedly. The underlying code appeared to be getting corrupted.

This problem appears to have gone away when I fixed the order with which I created the tabs. I noticed I had two reversed and fixed it. That made the problem go away mysteriously. I'm not sure why having the tabs out of order caused the SetWindowText() function to get corrupted, but I have seen stranger things.

I once spent two weeks trying to find a bug in some hardware I designed. The thing just would not work. One morning, it just started working. My lead predicted it would be back and I had to agree with him. The hardware went into production and nobody ever saw that bug again. The debugging gnomes is the only explanation I have. (I'm feeling old, I just realized that was more than 20 years ago...)

Thanks anyway,
Bill

tuan11111-Jun-09 17:37

tuan1111

1-Jun-09 17:37

www.codeproject.com
Hi Help me write this program
I have the code:

_Text SEGMENT PUBLIC USE16
assume CS: _Text, DS: _Text
org 0

; This is the entry point for the program

Entry:
db 0EAh; jmp far seg: OFS; Currently we are at
0:7 C00
DW Offset AfterData, 7C0h; This makes us be at 7C0: 0

; Our Message to the World
; ========================

HelloWorld db 'Hello World! ", 0;

AfterData:
push CS
pop DS; update DS 7C0 to be instead of 0

; Display Hello World
; ===================

mov si, HelloWorld Offset
do:
mov AL, DS: [SI]
SI inc
or AL, AL
jz done;
mov BX, 0
mov AH, 0Eh
int 10h
jmp do;
done:;

; OK We have displayed the message
; ================================

jmp $;

; Hang the system
; ===============
; Make the file 512 bytes long
; ============================
org 510

; Add the boot signature
; ======================

DW 0AA55h

_Text ENDS
END[^]
Who helped me in a boot loader called in w32 exe app
console: Create a window with the my interface
Bios.h help me, help write off may.Tat both functions use ANSI C written
Thank Vietnam

Creating Threads using Class Object functions

jobin0070071-Jun-09 15:38

1-Jun-09 15:38

Hi,
Suppose I have a class

Class ABC
{
void DO();
}

I want to do the following;

void main()
{

ABC Object[20];
for(int i=0;i<20;i++)
createthread(Object[i].DO); //So 20 Threads are created here.

}

I was able to do the above with boost library but unfortunately Visual C++ 2008 has some issues with Boost::threads package. Microsoft states that they wouldnt be able to fix the issue.

Is there any other way I can implement the above?

Thanks

David Crow1-Jun-09 17:04

David Crow

1-Jun-09 17:04

jobin007007 wrote:
Is there any other way I can implement the above?

In addition to fixing the syntax errors (there are at least 5), you'd need to make DO() a static member, correct its prototype, and make it public (unlike structs, class members default to private).

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

jobin0070071-Jun-09 17:30

1-Jun-09 17:30

I didnt mean to type an actual compiling code. What I meant to do is show a generic example. This could apply to any language. The createthread is just a generic, not an actual function. What I mean to ask is there any way of acheiving the below with other than boost librarys.

ABC Object[20];
for(int i=0;i<20;i++)
createthread(Object[i].DO); //So 20 Threads are created here.

Using the boost library, you can do the above and DO() does not need to be static. But it has some problems like i meantioned in the earlier post

I think the TR1 implementation of C++ also alows the above code. But do you know of anything in Visual Studio 2008 or any other widely used library that can do the above?

Thanks

David Crow2-Jun-09 2:30

David Crow

2-Jun-09 2:30

jobin007007 wrote:
But do you know of anything in Visual Studio 2008 or any other widely used library that can do the above?

No extra library is required. Your code will work by using CreateThread().

norish2-Jun-09 2:09

norish

2-Jun-09 2:09

If you want use CreateThread() Win32 API then must write additional static function to satisfy CreateThread()'s calling convention.
Like;

#include <windows.h>
class ABC {
  HANDLE m_child;
public:
  static DWORD __stdcall DO(void* p) {
    ((ABC*)p)->DoReally();
  };
  void DoReally() {};
};
void main()
{
  ABC Object[20];
  HANDLE childHandles[20];
  DOWRD childIds[20];
  for (int i = 0; i < 20; i++) {
    childHandles[i] = CreateThread(NULL, 0, Object[i].DO, &Object[i], 0, &childIds[i]);
  }
}

But CreateThread() do not mention C runtime, so I recommend _beginthreadex() runtime function to call.

In general, if you want to make thread with some windows api, you should make some entry point matching its api function interface.

norish2-Jun-09 2:12

norish

2-Jun-09 2:12

oh, no need m_child member for class ABC. D'Oh! | :doh:

Stuart Dootson2-Jun-09 2:25

2-Jun-09 2:25

jobin007007 wrote:
unfortunately Visual C++ 2008 has some issues with Boost::threads package

Really? Like what, pray tell? I've used VS2008 with Boost.Threads and I'd like to know what issues I might encounter...

Here's how I've implemented the pattern you want in the past:

class Updater
{
public:
  static Updater* StartUpdate()
  {
    Updater* u = new Updater();
    HANDLE hThread = (HANDLE)_beginthread(Updater::ThreadProc, 0, (LPVOID)u);
    return u;
  }

  static void ThreadProc(void* lpvUpdater)
  {
    Updater* updater = (Updater*)lpvUpdater;
    updater->DoUpdate();
  }
  void DoUpdate()
  {
    // Do the update
  }
};

The thread function is Updater::ThreadProc. This is passed an Updater instance pointer, which it uses to call the member function you actually want to call.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

jobin0070072-Jun-09 4:27

2-Jun-09 4:27

This is the same problem I had:

http://www.dotnet247.com/247reference/msgs/9/45762.aspx[^]

http://archives.free.net.ph/message/20071219.174855.5575add4.en.html[^]

Micrsoft Reply:--

http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=255748[^]

Anyways..My code wouldn't. So I gave up on BOOST

Stuart Dootson2-Jun-09 5:13

2-Jun-09 5:13

Ah - so it's a C++/CLI issue - well, that ain't going to worry me - I use vanilla C++ Smile | :)

But anyway - it only affects you (IIUC) when you statically link against Boost.Threads. If you put this line before any Boost #includes, then Boost will automatically link against the DLL.

#define BOOST_THREAD_DYN_DLL

I've just tested this with a little sample program (built with VC2008) which had this code compiled with /clr:

#include "stdafx.h"

using namespace System;

extern void flibble();

int main(array<System::String ^> ^args)
{
    Console::WriteLine(L"Hello World");
    flibble();
    return 0;
}

and this code compiled as native (against Boost 1.37.0)

#define BOOST_THREAD_DYN_DLL

#include <boost/thread.hpp>

void ThreadFunc()
{
   for(int i=0;i<INT_MAX;++i)
      ;
}

void flibble()
{
   boost::thread t(&ThreadFunc);
   t.join();
}

It ran successfully, but if I removed or commented out the #define, it crashed on start-up. So - there was probably no need to dump Boost Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

jobin0070072-Jun-09 12:17

2-Jun-09 12:17

Oh great. I am gonna test this out tommorow.

But the CLI portion of my project is Dynamic Library type with MFC in a Shared DLL.

I am not sure what my C# Project type is.

When you say But anyway - it only affects you (IIUC) when you statically link against Boost.Threads. If you put this line before any Boost #includes, then Boost will automatically link against the DLL.

1) what do you actually mean? Would you be able to make the meaning clearer?

2) Why is Boost statically linking with my library? or is vice versa? what does that actually mean?

3) What is difference between static and dynamic linkage.

It would be really great if you could answer these questions.

Stuart Dootson2-Jun-09 12:30