Re: Using MagSetImageScalingCallback - C / C++ / MFC Discussion Boards

econy23-May-13 2:52

23-May-13 2:52

Hi, I want to change the background bitmap of a dialog dynamically, for example, press button1, the background turn to image1, press button2, the background turn to image2.

I try to use a bool variable,like:
if (btnimg == 0) dlg.loadbitmap(image1);
else dlg.loadbitmap(image2);

it not work well.

Re: How to change bitmap dynamically

Richard MacCutchan23-May-13 5:24

Richard MacCutchan

23-May-13 5:24

econy wrote:
it not work well.

You need to explain, in technical terms, what that means.

Use the best guess

Re: How to change bitmap dynamically

econy23-May-13 7:07

econy

23-May-13 7:07

Solved. first I want to use one bitmap object, than load different bitmap resource. late, I found it is very easy to implement with 2 bitmap object.

CEdit control

sarfaraznawaz22-May-13 20:12

sarfaraznawaz

22-May-13 20:12

how to set char limit so that it should not exceed the 11 char .
after exceeding 11 char does not allow to press the key.
any example will helpful

Re: CEdit control

Sivaraman Dhamodharan22-May-13 20:25

Sivaraman Dhamodharan

22-May-13 20:25

Look for implementing Custom DDV (Google for Custom DDV in MFC) (Like Dynamic Data Exchange(DDX), it is Dynamic Data Validation)

Programming Article

Re: CEdit control

Jochen Arndt22-May-13 21:06

Jochen Arndt

22-May-13 21:06

See CEdit::SetLimitText()[^].

Using MagSetImageScalingCallback

thanh_bkhn22-May-13 15:55

thanh_bkhn

22-May-13 15:55

Hi everyone,
I need to use MagSetImageScalingCallback to capture the desktop screen. But I cannot find out how to call it correctly. I know it's odd, but do you have any idea about this deprecated function?

Re: Using MagSetImageScalingCallback

«_Superman_»22-May-13 16:18

«_Superman_»

22-May-13 16:18

The documentation link that you provided has some lines in it that I would like to quote here -

Quote:
Note The MagSetImageScalingCallback function is deprecated in Windows 7 and later, and should not be used in new applications. There is no alternate functionality.

Quote:
This function requires Windows Display Driver Model (WDDM)-capable video cards.

Quote:
This function works only when Desktop Window Manager (DWM) is off.

For screen capture, look at the following articles -
Various methods for capturing the screen[^]
Barry's Screen Capture[^]

Not sure if this is already mentioned in the articles, but I once captured the screen using the CreateDC API used this way -

HDC hdc = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);

You then save the device context in hdc to a file.
Read here for saving the device context -
Converting Device context to images ( PNG , JPEG , BMP , GIF) , Creating PDF & Printing to the Printer[^]
Saving (part of) a Device Context as a Bitmap[^]

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

Microsoft MVP (Visual C++) (October 2009 - September 2013)

Polymorphism in C

any solution for WSAETIMEDOUT for CAsynSocket::OnConnect

ForNow22-May-13 6:36

ForNow

22-May-13 6:36

Hi
When I first got my laptop last august my application that I was developing (at least the TCP/IP code)
was running fine about now my laptop runs a lot slower I tried to clean it up but it still doesn't
run nearly as fast it did when I bought it

towards that end on My CAsyncSocket::OnConnect overridble I am getting the following nErrorCode

WSAETIMEDOUT

I am wondering what is the best approach to this is modifying a registry key for the TCP/IP time out value (I am running Windows 7)

Maybe start clean re-install of Windows

Any suggestion appreciated

Thanks

Re: any solution for WSAETIMEDOUT for CAsynSocket::OnConnect

Richard MacCutchan22-May-13 21:02

Richard MacCutchan

22-May-13 21:02

Don't try solving a problem that may not exist. The first thing you need to do is investigate why the timeout is occurring.

Use the best guess

Re: any solution for WSAETIMEDOUT for CAsynSocket::OnConnect

ForNow23-May-13 4:32

ForNow

23-May-13 4:32

My computer has gotten a lot slower since I have gotten it

<a href="http://support.microsoft.com/kb/170359">http://support.microsoft.com/kb/170359</a>[<a href="http://support.microsoft.com/kb/170359" target="_blank" title="New Window">^</a>]

I tried Microsoft knowledge base 170359 to resolve the problem upping the time out times but didn't seem to work

I am thinking of re-installing windows to get the computer back to speed

source code sudoku c

Member 1006942622-May-13 3:54

Member 10069426

22-May-13 3:54

does anyone have the source code of sudoku?, but that requires us to input numbers and and using C

Re: source code sudoku c

C^hris L^osinger22-May-13 4:16

C^hris L^osinger

22-May-13 4:16

yes, somebody probably does

image processing toolkits | batch image processing

Re: source code sudoku c

CPallini22-May-13 22:54

CPallini

22-May-13 22:54

Definitely.
Thumbs Up | :thumbsup:

Veni, vidi, vici.

C++ Syntax failure ?

Engeltje22-May-13 3:40

Engeltje

22-May-13 3:40

Can anyone explain me why the following C++ snippet does compile and not end up in a compiler error ?

C++

int main()
{
  double d;
  d = 0,2;      // WHY IS THIS NOT A COMPILER ERROR ?

  return 0;
}

I would expect the double assignment should be

C++

double d;
d = 0.2;

Because I couldn't believe it, I tried VisualStudio 2010, -2005 AND -6, all three compiled with 0 errors, 0 warnings...

Re: C++ Syntax failure ?

Jochen Arndt22-May-13 4:11

Jochen Arndt

22-May-13 4:11

See the C comma operator[^]

Re: C++ Syntax failure ?

Engeltje22-May-13 4:25

Engeltje

22-May-13 4:25

How simple can it be... Thank you Jochen.
And thanks to CppCheck for finding the mistake!
(see cppcheck.sourceforge.net)

Re: C++ Syntax failure ?

Erudite_Eric27-May-13 10:56

Erudite_Eric

27-May-13 10:56

'cos its built to handle the continental europeans, who use the comma for a decimal point.... Smile | :)

==============================

Nothing to say.

error handling in c++ dll

venkatesh5286721-May-13 19:39

venkatesh52867

21-May-13 19:39

Hi,
I have one function which is return string array in my C++ dll .from this function how can return error .please help me .
Thanks

Re: error handling in c++ dll

Richard MacCutchan21-May-13 21:05

Richard MacCutchan

21-May-13 21:05

venkatesh52867 wrote:
how can return error

Use SetLastError() to set some unique error code, and return NULL instead of a valid pointer.

Use the best guess

MFC SetTimer() question [solved]

econy21-May-13 7:13

econy

21-May-13 7:13

In a dialog, WM_PAINT message handler, I set a timer.

C++

void CXYZDlg::OnPaint()
{... SetTimer(12, 2500, NULL);}

in the OnTimer(),I found I have to set it again, then it goes into
the breakpoint in OnTimer() repeatedly. otherwise, it only goes into the OnTimer() function once.

<pre lang="c++">void CXYZ::OnTimer(UINT_PTR nIDEvent)
{
if (g_Scroll == 1) {
		if ( sc< 16 ){
			BuzzerOnce(1);
			SC++;
		}
		else
			sc = 1;
	}

	...
	SetTimer(1361, 2500, NULL);  //Have to set this, other wise OnTimer only runs once. I am confused with this statement.
	CDialog::OnTimer(nIDEvent);
}

modified 29-May-13 12:33pm.

Re: MFC SetTimer() question

David Crow21-May-13 9:36

David Crow

21-May-13 9:36

Set the timer once in the dialog's OnInitDialog() method.

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

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Re: MFC SetTimer() question

econy21-May-13 15:32

econy

21-May-13 15:32

Thanks, but, it's like in the OnPaint();

Re: MFC SetTimer() question

David Crow28-May-13 4:29

David Crow

28-May-13 4:29

Do you realize how many WM_PAINT messages a window handles? With few exceptions, that's not a good choice for turning a timer on.

Re: MFC SetTimer() question

thanh_bkhn21-May-13 16:46

thanh_bkhn

21-May-13 16:46

I don't understand why you have to set the timer again because it will repeatedly called. If you want to handle multiple timers, you can call SetTimer() with multiple Id, for example

C++

SetTimer(12, 2500, NULL);
SetTimer(1361, 2500, NULL);

Then in the OnTimer(UINT nIDEvent), you can process it as below:

C++

if(nIDEvent == 12){
...
}
if(nIDEvent == 1361){
...
}

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