C / C++ / MFC Discussion Boards

jalsa G3-Jul-06 2:07

3-Jul-06 2:07

thans for your suggestion Maximilien,

but at the same time i am getting mfc send report error when i press that complete application is closing

thanks
venu

venu

Re: how can i debug my project !

jalsa G3-Jul-06 2:21

jalsa G

3-Jul-06 2:21

i am getting following error !

hPrevInstance unused and expression can't be evaluated

plz help me
venu

venu

Picture & Bitmap

Diglu3-Jul-06 1:34

Diglu

3-Jul-06 1:34

Hi all,
What is the difference between Picture and Bitmap?
Thanks to all.

Re: Picture & Bitmap

Rilhas9-Jul-06 5:21

Rilhas

9-Jul-06 5:21

Your question might lead to several philosophical discussions, because it is not at all specific. So, it is not easy to try to use proper definitions without a minimum context to focus on. Anyway, I'll try.

A picture is a general term for a visual representation of something. A picture, by this definition, has to contain both aspects: it must be a representation, and it must be visual.

A bitmap, by itself, will not be a picture. It will just be a sequence of bits. It will become a picture when you display it on a screen, or when you print it on a piece of paper, or when you make it visible in any way.

So, generally speaking, a bitmap is a way to store image data, so that it can be represented as a picture (when used by a display device). Note that so do JPEG, TIFF, GIF, PNG, and many more image data storage formats. None of them are pictures until they are displayed.

Most often with computers the term bitmap is used to refer to the storage of picture data without compression. In this form, there is a data unit for each pixel. For example, an RGB bitmap will contain 3 bytes for each pixel. In a 6 mega-pixel image from your digital camera the bitmap would then have 18 MB in size.

The general oposite of using the term bitmap is usually to refer to compressed images. In these formats, a data unit is used to represent a larger number of pixels. For example, a high quality JPEG would typicall have 0.3 bytes per pixel (about 10 times less than bitmaps). By allowing JPEG compression to discard more and more information then you can have as few as 0.06 bytes per pixel (a single byte will generate enough information to draw more than 16 pixels) and you may still recognize the picture it intends to represent. There are also, of course, lossless compression formats.

To back this up here are google's definitions:

define:picture - a visual representation (of an object or scene or person or abstraction) produced on a surface; "they showed us the pictures of their wedding"; "a movie is a series of images projected so rapidly that the eye integrates them"

define:bitmap - The method of storing information that maps an image pixel, bit by bit. There are many bitmapped file formats, .bmp, .pcx, .pict, .pict-2, tiff, .tif, .gif (89a), and so on. Most image files are bit mapped. This type of file gives you the ´jaggies´, when examined closely you can see the line of pixels that create edges. Bitmap images are used by all computers. The desktop or screen information for all Windows machines uses .bmp files, while the Macintosh uses pict files.

If you take these definitions too far you will run into problems. People could argue that you can have a bitmap of all black pixels, representing no light at all, and that that bitmap can never be represented as a picture. The basis for this argument, is that since a picture is defined as a visual representation, then it must contain some light. If it does not show any light then it is not a picture. However, the bitmap can have all its pixels coded as "light absence" (or black) thus, in fact, that bitmap could be said to represent no picture.

Rilhas

IsThereany DirectShow People?

atimpoo3-Jul-06 1:34

atimpoo

3-Jul-06 1:34

Hi,

I want to have Horizontal and vertical transition effects in my directshow created Video. I could get the Left to right but not the others(Right to left, top to bottom and bottom to top).

Does DirectShow suport those transitions? if yes can i have the class id for those transitions.

Thanks in Advance,
Poornima

C++ project

Nirmal Khatri3-Jul-06 1:13

Nirmal Khatri

3-Jul-06 1:13

In my project i found this type of code in a header file, bUT I CAN'T UNDERSTAND IT.
PLZ help me
Thanks

public:
CDCDlg(CWnd* pParent = NULL); // standard constructor

// Dialog Data
//{{AFX_DATA(CDCDlg)
enum { IDD = IDD_DC_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA

// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDCDlg)
protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support
//}}AFX_VIRTUAL

Re: C++ project [modified]

see me3-Jul-06 1:25

see me

3-Jul-06 1:25

This is a header file of a class named CDCDlg.cpp which is derived from CDialog.

"Dream bigger...Do bigger...Expect smaller"
aji

-- modified at 7:26 Monday 3rd July, 2006

Re: C++ project

Hamid_RT3-Jul-06 1:42

Hamid_RT

3-Jul-06 1:42

i think file is DCDlg.cpp not CDCDlg.cpp because CDCDlg.cpp is for class

whitesky

Re: C++ project [modified]

_AnsHUMAN_ 3-Jul-06 1:27

_AnsHUMAN_

3-Jul-06 1:27

public:
CDCDlg(CWnd* pParent = NULL); // standard constructor

// This is the constructor for your class.

// Dialog Data
//{{AFX_DATA(CDCDlg)
enum { IDD = IDD_DC_DIALOG };
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA

This is where the class wizard adds all the data members that you create using the class wizard (ex CEdit , CButton etc)that is why those //{{ brackets are placed to inform the class wizard where to add the code.

and any overrides ex declaration for PreCreateWindow the declaration is added in the protected section that you do using the class wizard.

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

-- modified at 7:28 Monday 3rd July, 2006

Re: C++ project

Hamid_RT3-Jul-06 1:40

Hamid_RT

3-Jul-06 1:40

a code (i think create with VC6) and a header for DCDlg.cpp (maybe)

this line CDCDlg(CWnd* pParent = NULL); is like this

CDCDlg::CDCDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CssDlg::IDD, pParent)

{
}

enum { IDD = IDD_DC_DIALOG };id from your Dialog

<br />
protected:<br />
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support<br />

void CDCDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

whitesky

IBM DB2 SQL Error Code to String

Christopher Stratmann3-Jul-06 1:12

Christopher Stratmann

3-Jul-06 1:12

In DB2 sometimes error messages are generated and returned in the sqlca.sqlcode variable in C++. To find out the string representation of this number I have to go to http://publib.boulder.ibm.com/infocenter/db2v7luw/index.jsp?topic=/com.ibm.db2v7.doc/db2m0/sql0000.htm[^]. Is there function to return the error string represented by this number so I dont have to go to this web site each time.

I have been researching this for sometime and I found a C++ APIs on this web site http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.ibm.db2.ii.doc/ad/rwrutl01.htm[^]. I didnt find any function to do this but it might help.

Another thing. If this "method" could be language specific that would be great too (meaning if English is defined return an english string or if German is defined return the german string).

Thanks Chris

Re: IBM DB2 SQL Error Code to String

Garth J Lancaster3-Jul-06 2:52

Garth J Lancaster

3-Jul-06 2:52

chris175 wrote:
I didnt find any function to do this but it might help.

are you sure - report_error looks like it might do the trick - else it points to an include sqlcodes.h that might have the strings in an array you can use

as for i18n .. hmm you might find a german version of the error codes/text somewhere in the install

hth

'g'

Re: IBM DB2 SQL Error Code to String

Christopher Stratmann3-Jul-06 5:32

Christopher Stratmann

3-Jul-06 5:32

Thanks for the response. I have researched report_error and found tried using it. I am having trouble finding examples on how to use it and what it does exactly. I am guessing it displays a message to the user? I found 1 example searching on google http://webkemper1.informatik.tu-muenchen.de:8080/interna/db2/en_US/index.htm?openup=ad/t0009587.htm[^]. It is not a very good example because I took that same code and placed it into my project and I get and error stating "Unhandled exception in qadocm.exe (DB2QG.dll): 0xC00..005: Access Violation.

Chris

Problem in CSocket

zahid_ash3-Jul-06 0:34

zahid_ash

3-Jul-06 0:34

HI,

I have delevoped a Client Server multithreaded application using CSocket, I am getting Socket Notification Sink error.

Wht iy is ? How can remove this ?

Thanks

Regards.

Re: Problem in CSocket

Ganesh_T3-Jul-06 2:29

Ganesh_T

3-Jul-06 2:29

look Here[^]

"A winner is not one who never fails...but the one who never quits"

Visual C++

tamasan3-Jul-06 0:16

tamasan

3-Jul-06 0:16

How does I use .jar lib in visual C++

Re: Visual C++

_AnsHUMAN_ 3-Jul-06 0:20

_AnsHUMAN_

3-Jul-06 0:20

Why do you really want to use the java library in C++?
AFAIK , You will need to host the JVM for that ..

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: Visual C++

Benoy Bose3-Jul-06 1:27

Benoy Bose

3-Jul-06 1:27

You can run jar file if and only if you are hosted JVM. But you can open, view, read and modify the Jar file from VC++ since Jar file has the same file format as ZIP file.

http://www.artpol-software.com/index_zip.html
Here is library which can be used for accessing zip archives.

Benoy Bose

Re: Visual C++ [modified]

Niklas L3-Jul-06 3:22

Niklas L

3-Jul-06 3:22

You might want to have a look at Java Native Interface, JNI, found here: JNI

-- modified at 9:22 Monday 3rd July, 2006
fogot to add the link Blush | :O

Trying to Display HWND as String

redfish342-Jul-06 23:37

redfish34

2-Jul-06 23:37

I am a beginner. I am trying to display the HWND when i use certain Win32 functions such as GetForegroundWindow() for debugging purposes. When i use MessageBox or OutputDebugString such as below...

m_foreHwnd1 = GetForegroundWindow();
MessageBox(NULL, (LPCSTR)m_foreHwnd1, "INFO", MB_OK);

OutputDebugString("ForeHwnd1: ");
OutputDebugString((LPCSTR)m_foreHwnd1);
OutputDebugString("\n");

... I get errors like the following:

First-chance exception at 0x77e26673 in SendFocusWin.exe: 0xC0000005: Access violation reading location 0x00090548.
Unhandled exception at 0x77e26673 in SendFocusWin.exe: 0xC0000005: Access violation reading location 0x00090548.

Can i display the HWND so i can see what the heck is going on in my code? What is the How To?

Re: Trying to Display HWND as String

Justin Tay2-Jul-06 23:58

Justin Tay

2-Jul-06 23:58

First thing you need to learn is that you do not cast things without knowing exactly what you are doing as you can shoot yourself in the foot, like what you have done here.

m_foreHwnd1 = GetForegroundWindow();
CString szMessage;
szMessage.Format(_T("ForeHwnd1: 0x%08X\r\n"), m_foreHwnd1);
OutputDebugString(szMessage);

Re: Trying to Display HWND as String

see me2-Jul-06 23:58

see me

2-Jul-06 23:58

Did you try Format function of CString

else try this

CString strHwnd;
strHwnd.Format(_T("Handle is: %d\n"), m_foreHwnd1);
OutputDebugString(strHwnd);

"Dream bigger...Do bigger...Expect smaller"
aji

Re: Trying to Display HWND as String

Abhi Lahare3-Jul-06 0:04

Abhi Lahare

3-Jul-06 0:04

GetForegroundWindow() API will return handle to active window with which user is interacting, so in debugging mode you constantly switch between your app and debug window. so its difficult to know window handle.

Not sure what are you trying to do, but try this to display window handle in output window.

CString str;<br />
str.Format("%x",m_foreHwnd1);<br />
OutputDebugString(str);

Hope this helps

Re: Trying to Display HWND as String

see me3-Jul-06 0:19

see me

3-Jul-06 0:19

If u r able to solve ur problem with our answers then please tel it so that we get some confidence

"Dream bigger...Do bigger...Expect smaller"
aji

Wrong Forum

redfish343-Jul-06 23:03

redfish34

3-Jul-06 23:03

I think i posted on the wrong forum. I now see that there is a forum that supports STL questions, which i think would help come up with a ANSI version of the solution you folks provided. Sorry. But thanks for the excellent response!

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