C / C++ / MFC

13-May-11 11:29

How create a GUI to allow screen capture?

Albert Holguin13-May-11 11:48

13-May-11 11:48

You mean other than the built in windows one? Do you only want a subset of your screen captured?

Member 296547113-May-11 12:06

13-May-11 12:06

I want to implement a mechanism that allows users to easy select the capture area (the entire screen, the window of a program, a rectangle, ...)...is it possible?

Mark Salsbery13-May-11 12:57

13-May-11 12:57

Yes it's possible.

Which part are you not sure about?

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Member 296547113-May-11 13:43

13-May-11 13:43

I want to realize a GUI like this:

With mouse pointer I'd want:
Entire Screen Capture
Program Window Capture
Part of a Program Window
Select Generic Rectangle

but I don't know which API I've to use in order to do this. May you help me please?

Amarnath S13-May-11 17:00

Amarnath S

13-May-11 17:00

This is possible. One of the early editions of Petzold's Windows books - "Programming Windows 95" gives an example of the BitBlt() which does exactly this. This is done in raw Windows API. You can, of course, redo it in C# or your favorite language.

Member 296547114-May-11 2:55

Re: How create a GUI to allow screen capture? [modified]

14-May-11 2:55

yes, i know BitBlt(), but how can i get the handle of the window that mouse over?how can i select, with mouse, a rectangle of the screen?

Mark Salsbery14-May-11 6:34

red squiggly line - misspelt words

14-May-11 6:34

Member 2965471 wrote:
but how can i get the handle of the window that mouse over?how can i select, with mouse, a rectangle of the screen?

This is relatively simple if you know anything about Win32 UI/graphics programming. Since you seem to want to skip that part, why not just search for examples?

Binging "win32 draw selection rectangle on desktop" finds many examples, including this...

Screen Capture (Simple Win32 Dialog Based)[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

modified on Saturday, May 14, 2011 12:44 PM

si_6913-May-11 5:42

si_69

13-May-11 5:42

Hi
Does anyone know how to get/use the red squiggly line used in Ms word for spelling mistakes

thanks

simon

Albert Holguin13-May-11 7:22

13-May-11 7:22

This is not the proper forum for this question... this is "Forum: C / C++ / MFC"

Hans Dietrich13-May-11 13:09

Hans Dietrich

13-May-11 13:09

How do you know the OP is not asking about how to implement spell check in CRichEditCtrl?

Best wishes,
Hans

[Hans Dietrich Software]

Albert Holguin13-May-11 13:13

13-May-11 13:13

good point, I don't....

Mark Salsbery13-May-11 14:03

13-May-11 14:03

How does anyone know...

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Hans Dietrich13-May-11 20:09

Hans Dietrich

13-May-11 20:09

Mark Salsbery wrote:
How does anyone know...

You really never do. That's why God made else. Smile | :)

Best wishes,
Hans

[Hans Dietrich Software]

image processing toolkits | batch image processing

C^hris L^osinger14-May-11 5:32

C^hris L^osinger

14-May-11 5:32

you will have to draw it yourself, if you want such a thing.

detect memory leak by _CrtDumpMemoryLeaks();

includeh1013-May-11 2:57

includeh10

13-May-11 2:57

As in link: http://msdn.microsoft.com/en-us/library/e5ewb1h3%28v=VS.80%29.aspx[^]

I defined

#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>

and call _CrtDumpMemoryLeaks() in 2 places:

place 1. from a menu Item.
in this case, I see leaking info as:

Detected memory leaks!
Dumping objects ->
{3443} normal block at 0x02EE9BF8, 373376 bytes long.
 Data: <                > C0 C0 C0 C0 C0 C0 00 00 00 00 00 00 00 00 00 00 
afxtempl.h(330) : {3273} normal block at 0x01DCD530, 4 bytes long.
 Data: <(   > 28 10 07 02 
strcore.cpp(118) : {3272} normal block at 0x01DCF2A0, 22 bytes long.
 Data: <            H a > 01 00 00 00 04 00 00 00 04 00 00 00 48 00 61 00 
//more...
E:\Develops\MyProgram\MyUser.cpp(101) : {3258} client block at 0x01DCF890, subtype 0, 152 bytes long.
a CWnd object at $01DCF890, 152 bytes long
strcore.cpp(118) : {3256} normal block at 0x01DCE130, 22 bytes long.
 Data: <            N e > 01 00 00 00 04 00 00 00 04 00 00 00 4E 00 65 00 
//more...

I think info above is not meaningful because app has not exited and many operator "new"s have not been deleted.

place 2. at exit point (MFC - destructor of CWinApp's subclass)
this time, I still see

Detected memory leaks!
Dumping objects ->
{3473} normal block at 0x01DA20C0, 28 bytes long.
 Data: <    !Ce         > BC DF AF AB 21 43 65 87 83 00 00 00 00 00 00 00 
{3443} normal block at 0x02EE9BF8, 373376 bytes long.
 Data: <                > C0 C0 C0 C0 C0 C0 00 00 00 00 00 00 00 00 00 00 
//more...

But, this time, there is no any info about my program files, such as in case 1:

E:\Develops\MyProgram\MyUser.cpp(101) : {3258} client block at 0x01DCF890, subtype 0, 152 bytes long.
a CWnd object at $01DCF890, 152 bytes long
strcore.cpp(118) : {3256} normal block at 0x01DCE130, 22 bytes long.
 Data: &lt;            N e &gt; 01 00 00 00 04 00 00 00 04 00 00 00 4E 00 65 00

My Q is:
Does info in place 2 mean that my program has no memory leaks because there are no my files there?
Or how to find solution without my files related info?

Re: detect memory leak by _CrtDumpMemoryLeaks();

Albert Holguin13-May-11 4:47

Re: detect memory leak by _CrtDumpMemoryLeaks();

13-May-11 4:47

includeh10 wrote:
Does info in place 2 mean that my program has no memory leaks because there are no my files there?

No, it means that whatever section of the code is causing the leak, didn't provide the expanded information. Usually you have to set certain flags to get the expanded information. Look that up in MSDN.

includeh10 wrote:
Or how to find solution without my files related info?

If you can't figure out how to activate the proper flags for the section of code doing this (to get expanded info), you can still find the leaking data by doing a bit of detective work. You can look for allocations of that size, look for for all allocations without matching deallocations (new/delete as well as malloc/dealloc), look at whether the content (labeled "Data:") provides any clue as to what it may be, and look at memory allocations within the program, usually heap is allocated in chunks and you get allocations in memory that are next to one another (don't know if that makes a lot of sense, but what I mean is if there are two allocations in calls next to one another, they are likely to have addresses in memory that are close to one another, so you can use this to narrow the location of the leak).

Mark Salsbery13-May-11 5:09

Re: detect memory leak by _CrtDumpMemoryLeaks();

13-May-11 5:09

I use a global object of a class that wraps the memory state functions. Easier than trying to find a place in running code to call the functions.

Here's an example:

#ifdef _DEBUG

class _MemStateCheck
{
	public:
		CMemoryState oldMemState, newMemState, diffMemState;

		_MemStateCheck();
		~_MemStateCheck();
};

_MemStateCheck::_MemStateCheck()
{
	 oldMemState.Checkpoint();
}

_MemStateCheck::~_MemStateCheck()
{
    newMemState.Checkpoint();
    if( diffMemState.Difference( oldMemState, newMemState ) )
    {
        TRACE( "************************\n" );
        TRACE( "Memory leaks Detected\n" );
        TRACE( "************************\n" );
		  diffMemState.DumpStatistics();
		  diffMemState.DumpAllObjectsSince();
    }
	 else
	 {
        TRACE( "************************\n" );
        TRACE( "No memory leaks Detected\n" );
        TRACE( "************************\n" );
	 }
}

_MemStateCheck MemCheckObj;
#endif  //#ifdef _DEBUG

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

C^hris L^osinger14-May-11 5:34

C^hris L^osinger

14-May-11 5:34

if you want to see who is allocating those chunks of memory, you can use this... http://msdn.microsoft.com/en-us/library/w2fhc9a3%28v=vs.80%29.aspx[^]

image processing toolkits | batch image processing

Line break in CRichEdit Control

si_6913-May-11 0:34

si_69

13-May-11 0:34

Hi
I am using

m_richEditCtrl.SetSel(s,e);
sel = m_richEditCtrl.GetSelText();

to get the text of a selected item in a RichEdit Control

I having problems detecting if the selected text contains a line break or carriage return

can anyone help

thanks

Simon

Re: Line break in CRichEdit Control

si_6913-May-11 0:43

si_69

13-May-11 0:43

hi
please ignore this, i have worked it out noe Smile | :)

windows media encoder screen capture

Member 296547113-May-11 0:21