How can find List item click or checkbox click? - C / C++ / MFC Discussion Boards

How to get the whole view's screen shot when the view has scroll bar ?

wangningyu14-Nov-10 17:34

14-Nov-10 17:34

Hello ,everybody !

I want to get the whole screen shot in the SDI project,then save it to a bitmap file.

usually ,the shot just relative to the Device. I want get the whole view's screen shot ,whether the view is be hide by other window.

Is there anyway ?

Thanks for your reply !

Re: How to get the whole view's screen shot when the view has scroll bar ?

Dr.Walt Fair, PE14-Nov-10 18:16

Dr.Walt Fair, PE

14-Nov-10 18:16

Bring it to the front before taking the screen shot??

CQ de W5ALT

Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software

Re: How to get the whole view's screen shot when the view has scroll bar ?

wangningyu14-Nov-10 18:49

wangningyu

14-Nov-10 18:49

Thanks !

your mean's than call some funtion to show at first. but I think this isn't the goodness.

Is there other way ? Smile | :)

Re: How to get the whole view's screen shot when the view has scroll bar ?

Dr.Walt Fair, PE14-Nov-10 19:02

Dr.Walt Fair, PE

14-Nov-10 19:02

As far as I know, when you do a screen shot, you get what is on the screen. If part of your content is hidden by other windows, then you need to bring it to the front to take a screen shot. If it is too large for the screen and is partially hidden because it has scrolled, then you have a different problem.

Perhaps someone else has a better idea.

CQ de W5ALT

Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software

Re: How to get the whole view's screen shot when the view has scroll bar ?

wangningyu14-Nov-10 19:06

wangningyu

14-Nov-10 19:06

It's ?

Re: How to get the whole view's screen shot when the view has scroll bar ?

Randor 14-Nov-10 19:25

Randor

14-Nov-10 19:25

Koma Wang wrote:
Is there anyway ?

Yes, you can send the window the WM_PRINT[^] or WM_PRINTCLIENT[^] message and ask the win32k subsystem to paint into the device context you pass in the wParam. Not all windows support these messages (such as windows using DirectDraw) so your results may vary.

Best Wishes,
-David Delaune

Re: How to get the whole view's screen shot when the view has scroll bar ?

wangningyu14-Nov-10 19:27

wangningyu

14-Nov-10 19:27

Thanks !

I have a try soon.

Smile | :)

How can find List item click or checkbox click?

Le@rner12-Nov-10 22:22

Le@rner

12-Nov-10 22:22

Hi all,

i m using ListCtrl of Report View Type with checkbox property,

i want to identify when i click on ListCtrl its click on list item or checkbox.

i m using this code on NM_Click function

NMLISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
LVHITTESTINFO hitinfo;
hitinfo.pt = pNMListView->ptAction;
UINT uFlags;
int item = m_Err_List.HitTest(&hitinfo); 
if(item != -1)
{
  if (uFlags & LVHT_ONITEMSTATEICON)
     {
       AfxMessageBox("Click on checkbox");
     }
}

here message display in both case whether i click on check box or on list item

please help me how can i do this.

thanks in advance

Re: How can find List item click or checkbox click?

Richard MacCutchan12-Nov-10 23:36

Richard MacCutchan

12-Nov-10 23:36

You have not initialised uFlags to any value so the test is based on whatever arbitrary value exists there.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: How can find List item click or checkbox click?

Le@rner12-Nov-10 23:48

Le@rner

12-Nov-10 23:48

please tell me what value

Re: How can find List item click or checkbox click?

Richard MacCutchan13-Nov-10 0:18

Richard MacCutchan

13-Nov-10 0:18

Le@rner wrote:
please tell me what value

I am not sure, what is it supposed to represent? Take a look at the documentation for the message you are decoding to see what values can be returned, and where they are in the message packet that is received in your code.

Just say 'NO' to evaluated arguments for diadic functions! Ash

Re: How can find List item click or checkbox click?

Code-o-mat13-Nov-10 0:47

Code-o-mat

13-Nov-10 0:47

Try CListCtrl::HitTest[^] on for size... Smile | :)

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Leela: Fry, you're wasting your life sitting in front of that TV. You need to get out and see the real world.
Fry: But this is HDTV. It's got better resolution than the real world <

Re: How can find List item click or checkbox click?

David Crow13-Nov-10 15:41

David Crow

13-Nov-10 15:41

Since the checkbox can only exist in the first column (item 0), check for that instead.

"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

Re: How can find List item click or checkbox click?

«_Superman_»14-Nov-10 4:01

«_Superman_»

14-Nov-10 4:01

In this case probably, but technically it can exist in any column - XListCtrl - A custom-draw list control with subitem formatting[^]

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

Microsoft MVP (Visual C++)

Polymorphism in C

Fault Address error

MKC00212-Nov-10 21:24

MKC002

12-Nov-10 21:24

I am getting fault address error in my program. I am running the program in release mode and error is not coming constantly. When i check stack it shows adress 0x0000 or any other garbage address. I do not find any function name in call stack.
My program read data from a hard drive (asynchronously). After reading i process data. Sometimes error occured at address say 0x10000 or sometimes 0x20000. I can not reproduce error at same address and there is no hint for me how to detect error.
Is there any way to know where is the actual problem in my code.

Re: Fault Address error

Stephen Hewitt13-Nov-10 2:27

Stephen Hewitt

13-Nov-10 2:27

The normal place to start is to try reproducing the error in a debug build running under a debugger.

Steve

Re: Fault Address error

Code-o-mat13-Nov-10 8:48

Code-o-mat

13-Nov-10 8:48

See Post-Mortem Debugging Your Application with Minidumps and Visual Studio .NET[^].

CString to double [modified]

john563212-Nov-10 21:10

john5632

12-Nov-10 21:10

I am using _wtof() to convert CString to double but I am not getting the actual double number code is below:

CString szStr;
szStr = _T("4.6");
double fVar = _wtof(szStr);

I am getting 4.599999999

How can I get 4.6 after conversion?

modified on Saturday, November 13, 2010 5:28 AM

Re: CString to double

Stephen Hewitt13-Nov-10 2:30

Stephen Hewitt

13-Nov-10 2:30

Try reading What Every Computer Scientist Should Know About Floating-Point Arithmetic[^].

Steve

Terminating OpenMP loop early

Damir Valiulin12-Nov-10 12:51

Damir Valiulin

12-Nov-10 12:51

Another poster already asked similar question already (http://www.codeproject.com/Messages/3644795/What-is-the-best-way-to-break-return-from-OpenMP-l.aspx[^]), but I'll ask anyway.

I have a function that checks if a point belongs to an object in array. The loop looks like this:

for (int i=0; i<N; i++)
{
  if (point_is_in_object(obj[i], pt){
    return true;
  }
}
return false;

I parallelized it with OpenMP by adding shared boolean flag found.

bool found = false;
#pragma omp parallel for
for (int i=0; i<N; i++)
{
  if (!found)
  {
    if (point_is_in_object(obj[i], pt){
      found = true;
      #pragma omp flush (found)
    }
  }
}

return found;

Is this a good way to do this? Could this cause access violation when one thread is writing and the other thread is reading memory contents of found flag?

I'm new to OpenMP and don't know much how it operates under the hood. With standard Win32 I would isolate access to found with critical section. Should I do the same here as well and add critical clause?

Thanks

Re: Terminating OpenMP loop early

Randor 13-Nov-10 1:11

Randor

13-Nov-10 1:11

Damir Valiulin wrote:
Could this cause access violation when one thread is writing and the other thread is reading memory contents of found flag?

You are safe the memory barrier MFENCE[^] instruction will be generated by the flush directive. The only change I would suggest is declaring your bool as volatile. This will hint the compiler to generate instructions differently and not bother to keep your bool in a register.

Best Wishes,
-David Delaune

Re: Terminating OpenMP loop early

Damir Valiulin15-Nov-10 7:12

Damir Valiulin

15-Nov-10 7:12

David, thanks for the quick answer. This was helpful.

Using Liberary Module in VS 2008??

AmbiguousName12-Nov-10 8:44

AmbiguousName

12-Nov-10 8:44

hello guys...I have made a liberary module in VC 6. How can I use it in Visual C 2008?? thnx Confused | :confused:

Re: Using Liberary Module in VS 2008??

C^hris L^osinger15-Nov-10 1:03

C^hris L^osinger

15-Nov-10 1:03

you will probably need to re-build it in VS08

image processing toolkits | batch image processing

Which is better? Returning reference or value?

Code-o-mat12-Nov-10 8:18

Code-o-mat

12-Nov-10 8:18

Hey folks, i was just wondering, what do you think which of these would generate a faster way -if there's a difference at all- to query a class variable:

//--- Method A ----
class CMyClass
{
protected:
  int m_myVar;

public:
  int GetVar() const { return m_myVar; }
};

//---- Method B ----
  ...
  const int &GetVar() const { return m_myVar; }
  ...

//--- Method C ----
  ,,,
  inline int GetVar() const { return m_myVar; }
  ...

//---- Method D ----
  ...
  inline const int &GetVar() const { return m_myVar; }
  ...

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