C / C++ / MFC Discussion Boards

Jim Crafton7-Aug-07 9:54

7-Aug-07 9:54

The problem you're probably running into is that you're making message calls to an HWND created in thread A from code that is executing in thread B. To make things work correctly, you to to make sure that the code executes on thread A (or whatever the correct thread ultimately is). What you can do is have your worker thread (the thread(s) that is spawned by the main UI thread) call PostThreadMessage, and use the thread ID of the main UI thread. The message will be some custom message specific to your app, and in that message handler, you can then do things to your UI/dialog box.
You should read up on multiple threads and windows, and the PostThreadMessage/GetCurrentThreadId API's.

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

SELECT * FROM User WHERE Clue > 0
0 rows returned

Save an Orange - Use the VCF!
VCF Blog

Configuration Manager:

T.RATHA KRISHNAN6-Aug-07 23:25

T.RATHA KRISHNAN

6-Aug-07 23:25

I have VC++ project. In this project I have included Max plugins which are developed using Max4.0. Now I have to configure this project to Max 7.0. What are the changes do I have to make in the configuration manager?

Re: Configuration Manager:

Jim Crafton7-Aug-07 9:45

Jim Crafton

7-Aug-07 9:45

Hi,

No one can help you because they don't know what you're referring to.

What is Max? What are max plug-ins? Are they using (written in) plain old C++? COM? .Net? Something else?

Runtime Error for MoveWindow

yaminisridaran6-Aug-07 23:14

yaminisridaran

6-Aug-07 23:14

I am implementing an activex control. In Ondraw member function of the control I am trying to use MoveWindow so that the dialog can move according to the specified coordinates. I am getting error message whenever I draw that control.Plz give me some suggestions to solve this.

S.Yamini

Re: Runtime Error for MoveWindow

Rage7-Aug-07 1:21

Rage

7-Aug-07 1:21

Already tried to step-debug your code to see what is causing the crash ?

Don't follow any man spiritually, don't do anything that will get you in sh*t if god is real - Bradml[^]

Re: Runtime Error for MoveWindow

yaminisridaran7-Aug-07 1:46

yaminisridaran

7-Aug-07 1:46

Can u tell me how to make a picture control blank

S.Yamini

Re: Runtime Error for MoveWindow

Parthi_Appu7-Aug-07 1:35

Parthi_Appu

7-Aug-07 1:35

yaminisridaran wrote:
getting error message whenever I draw that control

What error you are getting?

yaminisridaran wrote:
In Ondraw member function of the control I am trying to use MoveWindow so that the dialog can move

Don't try to move or resize dialog while its painting..

Do your Duty and Don't expect the Result

Re: Runtime Error for MoveWindow

Hamid_RT7-Aug-07 19:22

Hamid_RT

7-Aug-07 19:22

What was error?

WhiteSky

Re: Runtime Error for MoveWindow

yaminisridaran7-Aug-07 19:44

yaminisridaran

7-Aug-07 19:44

Thanks for ur response.I solved it. Can u suggest some links for studying memory management

S.Yamini

Re: Runtime Error for MoveWindow

Hamid_RT7-Aug-07 20:32

Hamid_RT

7-Aug-07 20:32

I think your question is generaly memory management on c++ or any things but see these links:
Memory management[^]
The Memory Management Reference[^]
Good luck.;)

WhiteSky

Re: Runtime Error for MoveWindow

yaminisridaran7-Aug-07 21:30

yaminisridaran

7-Aug-07 21:30

Thanks

S.Yamini

Re: Runtime Error for MoveWindow

Hamid_RT7-Aug-07 21:42

Hamid_RT

7-Aug-07 21:42

You're welcome.

WhiteSky

Fatal Error C1189:

T.RATHA KRISHNAN6-Aug-07 23:05

T.RATHA KRISHNAN

6-Aug-07 23:05

I'm working in a VC++ project. In this project I have included some 3DStudioMAX Libraries. This project while compiling gives "Fatal Error: UnKnown MAX Version" C1189. What is the problem?

Re: Fatal Error C1189:

Jonathan [Darka]6-Aug-07 23:27

Jonathan [Darka]

6-Aug-07 23:27

Have a look at some of these entries, should give you an idea of what is wrong.

Basically the error is that you are using an unknown version of 3DStudioMAX, check the header file that is producing the error to see why it thinks the version is unknown.

regards,

Jonathan Wilkes
Darka[Xanya.net]

Database Updates

C++_Newbee6-Aug-07 22:37

C++_Newbee

6-Aug-07 22:37

Hi Friends ,
I am new to this Forum and to the seamless World of C++.

I have just been assigned the task of managing database updates and i dont have much clue abt it so without beating about the bush ill get to that!!!

In my C++ application the database is read once in the begining into local variables which are nothing but C++ objects acting as a sort of "Logical Cache" ,and the data thus retrieved into cache is processed .

WHile the first process is in progress ,the database gets updated which will be notified to the application ,upon receiving this notification , the application without disturbing the current process , has to update my Cache , so that the latest data is avaialble for the subsequent processes/calls.

I think it might require usage of Multithreading and Mutex,but thats that!

Can somebody help me with some tips or even better some sample code to kick start this activity.

Thanks in advance friends!

C++_Newbee
Frown | :-(

Re: Database Updates

David Crow7-Aug-07 2:54

David Crow

7-Aug-07 2:54

C++_Newbee wrote:
WHile the first process is in progress ,the database gets updated which will be notified to the application...

If the application is already being notified of the update, then you've got the hard part done. All you need to do now is call the routine that queries the database, and then update the UI.

Yes, you can use secondary threads for (some of) this, but they are not for the faint of heart. Unless you use them exactly right, they will cause more problems than they solve.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Database Updates

C++_Newbee7-Aug-07 18:09

C++_Newbee

7-Aug-07 18:09

Thanks...

DavidCrow wrote:
Yes, you can use secondary threads for (some of) this

Is there any other method other than threads , with which i can achieve the application processing its current call with the old data , and at the same time it updating the Logical Cache with the new data , for subsequent calls.

Confused | :confused:

stdout

baerten6-Aug-07 22:34

baerten

6-Aug-07 22:34

Hello,

i redirect the output flow of stdout with a pipe to a buffer.
Is it also possible to catch the position and color of the font & background?

Big thanks Smile | :)

Re: stdout

Russell^'6-Aug-07 23:56

Russell^'

6-Aug-07 23:56

To know the colors used you can use ReadConsoleOutput.
To know tho cursor position I think you can use GetConsoleSelectionInfo.

Russell

Re: stdout

baerten7-Aug-07 3:22

baerten

7-Aug-07 3:22

Big thanks!

It works great, but not with PDCurses Sigh | :sigh:

Catching the 'End Task' Event

Programm3r6-Aug-07 22:04

Programm3r

6-Aug-07 22:04

Hi all,

How can one catch the event of the 'End Task', generated from the task manager window? Why do I want to know, to prevent users from closing certain applications.

Thanks in advance
Regards,

The only programmers that are better that C programmers are those who code in 1's and 0's Green Alien | [Alien]

Programm3r
My Blog: ^_^

Re: Catching the 'End Task' Event

Jonathan [Darka]6-Aug-07 23:28

Jonathan [Darka]

6-Aug-07 23:28

I think you'll find it impossble to stop the user unless they don't have permissions to end the task, have you thought about making you application a Service ?

Jonathan Wilkes
Darka[Xanya.net]

Re: Catching the 'End Task' Event

jk chan7-Aug-07 0:03

jk chan

7-Aug-07 0:03

I know there is a WM_QUERYENDSESSION message which will occured during shutdown.
Smile | :)

If u can Dream... U can do it

how to change the device context for a status bar

BlrBoy6-Aug-07 21:35

BlrBoy

6-Aug-07 21:35

Hello All..

I am trying to draw a bitmap as background for the status bar. I have derived my own status bar from CStatusBar. When I try to override OnPaint ().. it erases the default status bar messages and panes.. I tried to change the Device Context on OnCreate () and OnNCPaint () both are not working here is the code.

<br />
void CMyStatusBar::OnNcPaint()<br />
{<br />
   CDC* pdc= GetWindowDC();<br />
<br />
    CDC memdc;    <br />
    memdc.CreateCompatibleDC(pdc);    <br />
    memdc.SelectObject(m_hBmp);    <br />
    pdc->BitBlt(0, 0, <br />
        m_rectLogo.Width(), <br />
        m_rectLogo.Height(), <br />
        &memdc, 0, 0, SRCCOPY);    <br />
<br />
    ReleaseDC(pdc);    	<br />
}<br />
<br />
int CMyStatusBar::OnCreate(LPCREATESTRUCT lpCreateStruct)<br />
{<br />
	if (CStatusBar::OnCreate(lpCreateStruct) == -1)<br />
		return -1;<br />
<br />
	m_hBmp = (HBITMAP)LoadImage(AfxGetInstanceHandle(), <br />
           MAKEINTRESOURCE(IDB_BKCOLOR_BMP), IMAGE_BITMAP, <br />
           0, 0, LR_CREATEDIBSECTION);<br />
<br />
        BITMAP bm;<br />
        GetObject(m_hBmp, sizeof(bm), &bm);    <br />
<br />
        m_rectLogo.left = 15;<br />
        m_rectLogo.right = 15 + bm.bmWidth;<br />
        m_rectLogo.top = 2 ;<br />
<br />
        return 0;<br />
}<br />

Next I tried to create a solid brush (for testing) in OnCreate and tried to select that object but that is also not working

<br />
int CMyStatusBar::OnCreate(LPCREATESTRUCT lpCreateStruct)<br />
{<br />
	if (CStatusBar::OnCreate(lpCreateStruct) == -1)<br />
		return -1;<br />
<br />
	if (!m_oBrush.CreateSolidBrush (RGB(255, 0, 0)))<br />
		AfxMessageBox ("Error in creating brush");<br />
<br />
	GetStatusBarCtrl().GetDC ()->SelectObject (&m_oBrush);<br />
<br />
         return 0;<br />
}<br />

I am unable to change the DC of the status bar.

Let me know how to draw a bitmap as back ground for a status bar?

Thanks for your time

Re: how to change the device context for a status bar

jk chan7-Aug-07 0:01

jk chan

7-Aug-07 0:01

Ok . Try CDC->fillsolidrect instead of bitmap painting. iF it not works , problem may with ur dc handle .

If u can Dream... U can do it

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.