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i am getting following error !
hPrevInstance unused and expression can't be evaluated
plz help me
venu
venu
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Hi all,
What is the difference between Picture and Bitmap?
Thanks to all.
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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
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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
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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
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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
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i think file is DCDlg.cpp not CDCDlg.cpp because CDCDlg.cpp is for class
whitesky
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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.
 _AnShUmAn_
-- modified at 7:28 Monday 3rd July, 2006
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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 )
: CDialog(CssDlg::IDD, pParent)
{
}
enum { IDD = IDD_DC_DIALOG };id from your Dialog
<br />
protected:<br />
virtual void DoDataExchange(CDataExchange* pDX);
void CDCDlg::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
}
whitesky
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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'
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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
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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.
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look Here[^]
"A winner is not one who never fails...but the one who never quits"
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How does I use .jar lib in visual C++
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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.
_AnShUmAn_
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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
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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 
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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?
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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);
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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
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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
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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
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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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HI PLZ TELL ME HOW TO CREATE SPLIT WINDOW IN MFC(SDI)
I CREATE IT BUT IT DOES NOT WORK
I ALREADY PUT MY QUESTION BUT NOBODY SOLVE MY PROBLEM
PLZ SOLVE BY GIVING EXAMPLE
Ashish Dogra
MCA
Noida
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