Re: AfxBeginThread - which form? - C / C++ / MFC Discussion Boards

Niklas L6-Dec-10 21:13

6-Dec-10 21:13

If the image is originally rendered with anti-aliasing, the simple replacement of colors will never look good. You can look at the hue of the colors to see if they are fairly close, and do some adjustments to the alpha channel according to that. The easiest thing would probably be to find an image library with this feature.

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Re: Transparency Of image

002comp7-Dec-10 0:29

002comp

7-Dec-10 0:29

Thanks for your Reply.
Can u please suggest me some Library or is It possible with GDI plus?

Regards
Yogesh

AfxBeginThread - which form?

charlieg6-Dec-10 6:23

charlieg

6-Dec-10 6:23

I make use of AfxBeginThread to kick off an mfc dialog that does some work for me. Form is:

AfxBeginThread(UI_proc, &threadData, Priority);

My goal is to create a UI thread that will be able to handle messages. In my testing, I clearly see messages delived to this dialog (wm_paint, etc). In migrating the code to another application, I was reading about AfxBeginThread. In the help, it shows two forms for the call:

<br />
CWinThread* AfxBeginThread( <br />
AFX_THREADPROC pfnThreadProc, <br />
LPVOID pParam, <br />
int nPriority = THREAD_PRIORITY_NORMAL, <br />
UINT nStackSize = 0, <br />
DWORD dwCreateFlags = 0, <br />
LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL );<br />

<br />
CWinThread* AfxBeginThread( <br />
CRuntimeClass* pThreadClass, <br />
int nPriority = THREAD_PRIORITY_NORMAL, <br />
UINT nStackSize = 0, <br />
DWORD dwCreateFlags = 0, <br />
LPSECURITY_ATTRIBUTES lpSecurityAttrs = NULL );<br />

The online help clearly indicates that the first version is for a worker thread while the latter is for a UI thread. My question is why does my code still receive UI events? Luck?

Charlie Gilley
<italic>You're going to tell me what I want to know, or I'm going to beat you to death in your own house.

"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759

Re: AfxBeginThread - which form?

«_Superman_»6-Dec-10 6:59

«_Superman_»

6-Dec-10 6:59

The first version only takes a function as its first parameter.
The function is simply runs in a new thread.

The second version takes a CWinThread derived class.
Which means you're running a whole new application in a new thread.

You must be calling it differently.
Do you have a different dialog showing up?
If so how are you calling it?

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

Microsoft MVP (Visual C++)

Polymorphism in C

Re: AfxBeginThread - which form?

Chris Meech6-Dec-10 7:35

Chris Meech

6-Dec-10 7:35

This is just a guess, but while the documentation says that the first version is for a worker thread and the latter for a UI thread, that doesn't necessarily mean that the first version might not work if you create UI components within that thread. It's possible that under certain circumstances it will work okay and under others it fails miserably. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]

posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

Re: AfxBeginThread - which form?

«_Superman_»6-Dec-10 7:59

«_Superman_»

6-Dec-10 7:59

The relationship between a worker thread and UI thread is that, a worker thread becomes a UI thread if you have a message loop in it. So I'm guessing the UI_proc function has a message loop in it.

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

Microsoft MVP (Visual C++)

Polymorphism in C

Re: AfxBeginThread - which form?

charlieg6-Dec-10 8:46

charlieg

6-Dec-10 8:46

Superman - my application is a little unique in that it is for an embedded HMI using WinCE. When my application needs to wait (a desktop PC would change the cursor to a wait cursor), my wait has to cover the entire control screen transparently with an animation in the center. So, in the UI thread, I have simply:

<br />
   CWaitDlg myDlg;//((CWnd*)pData->pParentWindow);<br />
   pData->pWaitDlg = &myDlg;<br />
<br />
   myDlg.m_sMessage = pData->sMessage;<br />
<br />
   myDlg.DoModal();<br />

The dialog is a standard mfc dialog with a BEGIN_MESSAGE_MAP() / END_MESSAGE_MAP() macro sequence. Is this what triggers everything to work correctly?

Appreciate the comments.

Re: AfxBeginThread - which form?

David Crow6-Dec-10 9:18

David Crow

6-Dec-10 9:18

charlieg wrote:
The online help clearly indicates that the first version is for a worker thread while the latter is for a UI thread.

All threads work. The distinction is that the second prototype is for a thread that has a message pump. See here for more.

"One man's wage rise is another man's price increase." - Harold Wilson

"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

"Man who follows car will be exhausted." - Confucius

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5-Dec-10 19:13

Jia100

5-Dec-10 19:13

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Re: CString::Replace() problem

Rajesh R Subramanian5-Dec-10 20:43

Rajesh R Subramanian

5-Dec-10 20:43

Run the replace commands one after another, instead of running them amuck. I hope I understood your query correctly - please explain otherwise.

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

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5-Dec-10 20:58

Jia100

5-Dec-10 20:58

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Re: CString::Replace() problem

Rajesh R Subramanian5-Dec-10 21:22

Rajesh R Subramanian

5-Dec-10 21:22

Without seeing the code, I can hardly tell anything.

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

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5-Dec-10 21:33

Jia100

5-Dec-10 21:33

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Re: CString::Replace() problem

Rajesh R Subramanian5-Dec-10 23:04

Rajesh R Subramanian

5-Dec-10 23:04

Nami.v.s wrote:
while(csTemp.Replace(","," <comma> "));
while(csTemp.Replace(":"," <scol> "));
}
else
{
while(csTemp.Replace("<comma>",""));
}

while(csTemp.Replace("\t"," "));
while(csTemp.Replace("\r",""));
while(csTemp.Replace("\n",""));

while(csTemp.Replace(" "," "));

It makes no sense to run the CString::Replace() within a while. The CString::Replace() call will automatically replace all the occurrences of the given input.

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

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5-Dec-10 23:24

Jia100

5-Dec-10 23:24

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Re: CString::Replace() problem

Rajesh R Subramanian6-Dec-10 0:49

Rajesh R Subramanian

6-Dec-10 0:49

The problem itself is not clear to me. What exactly are you trying to achieve? (provide sample input and desired output).

Important: Do not use txtspk here. Please type each word in full.

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

Message Removed

6-Dec-10 3:02

Jia100

6-Dec-10 3:02

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Re: CString::Replace() problem

Rajesh R Subramanian6-Dec-10 3:51

Rajesh R Subramanian

6-Dec-10 3:51

Nami.v.s wrote:
Name:XXXX,HomeLoc:WF

Nami.v.s wrote:
Name<scol>XXXX <comma>HomeLoc<scol>WF

First replace all the commas with a single call to CString::Replace().
Next, replace all the colons with another single call to CString::Replace()

If there are more such characters, repeat.

You should never need a while here.

It was ever thus, the Neophiles will always rush out and get 'The Latest Thing' at a high price and with all the inherent faults - Dalek Dave.

Re: CString::Replace() problem

David Crow6-Dec-10 3:41

David Crow

6-Dec-10 3:41

Either you are not understanding what you are asking, or you are not understanding what you've been told. Using the Replace() method within a while() loop is not going to work in your situation.

Other than that, if it's still not working, you need to show the input string, the desired output string, and the output string that your code produces.

Re: CString::Replace() problem

Luc Pattyn5-Dec-10 23:29

Luc Pattyn

5-Dec-10 23:29

IMO a looped replace may have a devastating effect, try

while(csTemp.Replace("a","ab"));

on a string that holds some 'a'.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

MFC Application Taskbar Icon Context Menu in Windows 7?

-273C5-Dec-10 8:05

-273C

5-Dec-10 8:05

I have a MFC C++ application that has a right-click context menu when it is minimized to the Taskbar. In Vista and Windows XP, all is well. Right click on the icon/application name in the task bar and there it is.

However, when run under Windows 7, all I get is the Windows 7 menu - Go to the Application, Pin it to the Taskbar or Close the Window.

If my application minimizes to the System Tray, then right-clicking on that icon in Windows XP, Vista and Windows 7 works OK and my application context menu appears.

Can anyone shed any light on this behaviour using the Taskbar and Windows 7?

Thx

Re: MFC Application Taskbar Icon Context Menu in Windows 7?

-273C5-Dec-10 11:46

-273C

5-Dec-10 11:46

Correction - on further testing - the thing I am missing when right-clicking on the icon on the Taskbar on Windows 7 is the System Control menu containing menu items: Restore, Move, Size, Minimize, Maximize and Close.

These are there for Windows XP and Vista - but Windows 7 only has Close.

Sorry for any confusion.

Find an open source powerful math library

followait5-Dec-10 0:24

followait

5-Dec-10 0:24

like mathematica Poke tongue | ;-P