C / C++ / MFC Discussion Boards

Frame transparent color in animated gif file

includeh109-Aug-11 6:31

9-Aug-11 6:31

Frames in many animated gif files don't have transparent color, that is, transparent color index of the frames is not valid (Transparent Color Flag is zero).

In the case, I guess, the frames use default transparent color : white - rgb=(255,255,255).
But I can not find docs on google to confirm it.

If you have knowledge about animated gif format, please let me know if my guess is true.

BTW:
all gifs of this kind found by me have white background, that is why I think there is default transparent color for this kind gifs.

Re: Frame transparent color in animated gif file

C^hris L^osinger9-Aug-11 10:45

C^hris L^osinger

9-Aug-11 10:45

here is the GIF Spec[^].

there is no default transparent color, AFAIK. typically the rendering code just picks a color like white or black, or the app lets the user choose a color when rendering transparent images, of any format, when there is no background.

image processing toolkits | batch image processing

How to learn DirectDraw since it has been merged with D3D?

Cold_Fearing_Bird9-Aug-11 4:48

Cold_Fearing_Bird

9-Aug-11 4:48

I am new to DirectDraw,I found it hard to find DirectDraw document on MSDN, it's all about D3D stuff which I don't really want to learn by now. So How should I start with DirectDraw? Any book/way recommended? thanks in advance.

Re: How to learn DirectDraw since it has been merged with D3D?

Charles Oppermann9-Aug-11 5:47

Charles Oppermann

9-Aug-11 5:47

From MSDN http://msdn.microsoft.com/en-us/library/gg426115(v=VS.85).aspx[^]

DirectDraw is no longer recommended for use. With the release of Direct3D 9.0, all two-dimensional functionality is contained within Direct3D, its associated helper functions in D3DX, and the DirectX 11 technology Direct2D. However, the DirectDraw reference documentation is still available in this section.

While I'm sure there are books that cover the older DirectDraw, you might as well start learning 2D drawing within the context of Direct3D.

/* Charles Oppermann */
http://weblogs.asp.net/chuckop

Re: How to learn DirectDraw since it has been merged with D3D?

C^hris L^osinger9-Aug-11 10:47

C^hris L^osinger

9-Aug-11 10:47

meh. don't bother. MS will come out with yet another API which will obsolete all the others, in the next two or three months. like they always do.

image processing toolkits | batch image processing

Re: How to learn DirectDraw since it has been merged with D3D?

Charles Oppermann9-Aug-11 10:55

Charles Oppermann

9-Aug-11 10:55

Considering that DirectDraw was part of DirectX in 1995, and was superceeded in 2001 with Direct3D. So the API the original poster wanted to use is 16 years old, and was replaced 10 years ago.

Considering the advances in video rendering, having a the same basic API for the past decade isn't bad.

/* Charles Oppermann */
http://weblogs.asp.net/chuckop

Re: How to learn DirectDraw since it has been merged with D3D?

Cold_Fearing_Bird9-Aug-11 14:36

Cold_Fearing_Bird

9-Aug-11 14:36

Thanks, I think I am stick with DirectDraw7.0.

Why can't read every value from MRU ?

_Flaviu9-Aug-11 3:15

_Flaviu

9-Aug-11 3:15

I tryid to read every file from MRU ( registry ) with follow code :

C++

void CFileSourcePage::GetKey(HKEY hKey, LPCTSTR lpSubKey, CStringArray& saResult)
{
	if(RegOpenKeyEx(hKey,lpSubKey,0,KEY_READ,&hKey) != ERROR_SUCCESS)return;

	DWORD dwType;
	BYTE bData[4096];
	DWORD cbData = 4096;
	TCHAR    achKey[MAX_KEY_LENGTH];	// buffer for subkey name
	DWORD    cbName;					// size of name string
	TCHAR    achClass[MAX_PATH] = TEXT("");// buffer for class name
	DWORD    cchClassName = MAX_PATH;	// size of class string
	DWORD    cSubKeys = 0;				// number of subkeys
	DWORD    cbMaxSubKey;				// longest subkey size
	DWORD    cchMaxClass;				// longest class string
	DWORD    cValues;					// number of values for key
	DWORD    cchMaxValue;				// longest value name
	DWORD    cbMaxValueData;			// longest value data
	DWORD    cbSecurityDescriptor;		// size of security descriptor
	FILETIME ftLastWriteTime;			// last write time

	DWORD i, retCode;

	TCHAR  achValue[MAX_VALUE_NAME];
	DWORD cchValue = MAX_VALUE_NAME;

	// Get the class name and the value count
	retCode = RegQueryInfoKey(
		hKey,                    // key handle
		achClass,                // buffer for class name
		&cchClassName,           // size of class string
		NULL,                    // reserved
		&cSubKeys,               // number of subkeys
		&cbMaxSubKey,            // longest subkey size
		&cchMaxClass,            // longest class string
		&cValues,                // number of values for this key
		&cchMaxValue,            // longest value name
		&cbMaxValueData,         // longest value data
		&cbSecurityDescriptor,   // security descriptor
		&ftLastWriteTime);       // last write time

	// Enumerate the subkeys, until RegEnumKeyEx fails.

	if(cSubKeys)
	{
		TRACE1("\nNumber of subkeys: %d\n", cSubKeys);

		for(i = 0;i < cSubKeys;++i)
		{
			cbName = MAX_KEY_LENGTH;
			retCode = RegEnumKeyEx(hKey, i,
				achKey,
				&cbName,
				NULL,
				NULL,
				NULL,
				&ftLastWriteTime);
			if(retCode == ERROR_SUCCESS)
			{
				TRACE2("(%d) %s\n",i + 1, achKey);
			}
		}
	}

	// Enumerate the key values.

	if(cValues)
	{
		TRACE1("\nNumber of values: %d\n", cValues);

		for(i = 0,retCode = ERROR_SUCCESS;i < cValues;++i)
		{
			cchValue = MAX_VALUE_NAME;
			retCode = RegEnumValue(hKey, i,
				achValue,
				&cchValue,
				NULL,
				&dwType,
				bData,
				&cbData);
			if(retCode == ERROR_SUCCESS)
			{
				LPSTR pszValue = reinterpret_cast<LPSTR>(bData);
				saResult.Add(pszValue);
			}
		}
	}

	RegCloseKey(hKey);
}

and in OnInitDialog() I try :

C++

CStringArray saMRU;
CString sFile = theApp.GetProfileString(_T("Settings"),_T("File"));
GetKey(HKEY_CURRENT_USER,_T("Software\\MyPlace\\Application\\Recent File List"),saMRU);

but altought I have 3 files there :

C++

C:\eeeeeeeeeeeeeee.xyz
E:\Flaviu\VC++\MDI\Application\aaaaaaaaaaaaaa
E:\Flaviu\VC++\MDI\Application\gbdhfdfgf

is reading only first and last file in CComboBox .... why ? What I'm doing wrong ? Thank you.

Re: Why can't read every value from MRU ?

David Crow9-Aug-11 3:49

David Crow

9-Aug-11 3:49

Flaviu2 wrote:
if(cValues)
{
TRACE1("\nNumber of values: %d\n", cValues);

What is the value of cValues?

Flaviu2 wrote:
is reading only first and last file in CComboBox...

So is the problem with reading from the registry or reading from the combobox?

What is the value of retCode each iteration of the second loop?

"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

"Some people are making such thorough preparation for rainy days that they aren't enjoying today's sunshine." - William Feather

Re: Why can't read every value from MRU ? [modified]

_Flaviu9-Aug-11 5:16

_Flaviu

9-Aug-11 5:16

The number of cValues is 3. Of course, the is registry reading, not combo vales. I didn't test retCode ... my mistake.

modified on Tuesday, August 9, 2011 11:29 AM

Re: Why can't read every value from MRU ?

Richard MacCutchan9-Aug-11 4:53

Richard MacCutchan

9-Aug-11 4:53

When you enumerate the key-values you need to reset the value of cbData to 4096 after each call. This is because each time a value is returned its length is stored in this field, so any values larger than a previous one will not be returned as the RegEnumValue() function thinks that the buffer is not large enough.

Unrequited desire is character building. OriginalGriff

Re: Why can't read every value from MRU ? [modified]

_Flaviu9-Aug-11 5:29

_Flaviu

9-Aug-11 5:29

Thank you all guys, you help me a lot ! Richard, that was the problem. Best wishes ! You do a great think here !

modified on Tuesday, August 9, 2011 1:43 PM

Debug Assertion Failed Error ! Help me please.

Nguyen Huy Tuan8-Aug-11 22:13

Nguyen Huy Tuan

8-Aug-11 22:13

Hi all,
I'm developing an application which helps to manage car park by recognizing the car's plate number. I use VC++, OpenCV, Windows SDK and DirectX in this app. But I am now having a little trouble with it.
Let me introduce a bit about how my system works so that you guys can understand about it:
When a car enters the park, we scan one card with a card reader. Right after the card is read, our camera will take a picture of the car's plate and our system will recognize the plate number and assign it to the scanned card's id. And the car will then be allowed to get into the park.
When the car gets out of the park, the same process happens. If the plate number of the car and the card's id are the same with those in database, the car will be allowed to get out.
Here is my trouble: When I start the application, it works fine and no errors happen like the below picture.

_http://s1.postimage.org/266bl4fsy/image.jpg[^]

But the "Debug assertion failed" error happen when I scan a card with our card reader. The specific error is in the below image.
_http://s2.postimage.org/270yeip2a/image.jpg[^]
Can any one help me to fix this annoying error? Many thanks to you all.

Re: Debug Assertion Failed Error ! Help me please.

Code-o-mat9-Aug-11 0:29

Code-o-mat

9-Aug-11 0:29

Click 'Retry', check the comments around the ASSERT and the call stack. We won't be able to tell you much more without actually seeing some code and/or knowing in more detail what you are doing.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> If it doesn't matter, it's antimatter.<

Re: Debug Assertion Failed Error ! Help me please.

David Crow9-Aug-11 4:01

David Crow

9-Aug-11 4:01

Nguyen Huy Tuan wrote:
But the "Debug assertion failed" error happen when I scan a card with our card reader.

So have you looked at line 906 of wincore.cpp?

Re: Debug Assertion Failed Error ! Help me please.

Nguyen Huy Tuan10-Aug-11 20:47

Nguyen Huy Tuan

10-Aug-11 20:47

In my opinion, there might be some wrong environment configurations with DirectX, or Window SDK, or ActiveX Control, not somthing which relates to wincore.cpp or any source code file of the project, since the project worked fine before, but I don't know what exactly it is. I'm getting crazy with this. It's messing me up....

How to extract only text information from html file?

Le@rner8-Aug-11 20:03

Le@rner

8-Aug-11 20:03

Hi all,

i am create a html file with text color,background color and other image formatting.

now i want to extract only text information of this page without any html tags.

please help me how can i do this.

thanks in advance.

Re: How to extract only text information from html file?

ThatsAlok8-Aug-11 21:12

ThatsAlok

8-Aug-11 21:12

Le@rner wrote:
i am create a html file with text color,background color and other image formatting.

now i want to extract only text information of this page without any html tags.

please help me how can i do this.

thanks in advance.

If you are aware of IHTMLElement interface, it might able to help you read more here[^]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
Never mind - my own stupidity is the source of every "problem" - Mixture

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

Re: How to extract only text information from html file?

Le@rner8-Aug-11 21:32

Le@rner

8-Aug-11 21:32

how can i use this?

there is any example for this.

Re: How to extract only text information from html file?

ThatsAlok9-Aug-11 2:01

ThatsAlok

9-Aug-11 2:01

Le@rner wrote:
there is any example for this

clickit[^]

cheers,
Alok Gupta
VC Forum Q&A :- I/IV
Support CRY- Child Relief and You

[solved]Still trying to hunt down a runtime error in VS 2010, need suggestions [modified]

AndrewG12318-Aug-11 9:35

AndrewG1231

8-Aug-11 9:35

I have been trying to hunt down the reason my program compiles fine, but has a problem in runtime with bitmaps. The program has been tracked down to a pointer that seems to have its value changed to NULL at some point during this call:

void CWinSTMView::OnImageAutoPlane() 
{
	CWinSTMDoc *pDoc = CreateNewDoc(GetDocument());

and

pDoc->CopyDoc(pNewDoc,m_MyChannel);

CATCH_ALL(e)
	{
		lResult = AfxProcessWndProcException(e, &pThreadState->m_lastSentMsg);
		TRACE(traceAppMsg, 0, "Warning: Uncaught exception in WindowProc (returning %ld).\n",
			lResult);
		DELETE_EXCEPTION(e);
	}

I have set breakpoints all around the location where the problem seems to be happening, but I keep stepping into what seems to be windows libraries and code that I probably shouldn't change (it is write protected). The bitmap also loads fine (and initializes) when I first open the file, it is only after I try the 'autoplane' function above that it encounters the exception. Any ideas on how I can go about fixing this? I have no problems with using the debugger and stepping through the code if more information is needed. (Please ask, I am not sure what would be helpful)

solved here:Debug Assertion Error Visual Studio 2010[^]

modified on Thursday, August 25, 2011 3:44 PM

Re: Still trying to hunt down a runtime error in VS 2010, need suggestions

Albert Holguin8-Aug-11 10:19

Albert Holguin

8-Aug-11 10:19

Which pointer had its value changed to NULL? What exception is thrown? Are you getting an ASSERT() exception or something else?

Re: Still trying to hunt down a runtime error in VS 2010, need suggestions

AndrewG12318-Aug-11 10:48

AndrewG1231

8-Aug-11 10:48

The pointer is called m_bitmap and I think it holds the memory location to the saved bitmap since it is called in the following

bool CWinSTMBmp::Init(int sizex, int sizey, RGBQUAD* Pal)
{
	// if bmp already exists, delete it and start over
	if (m_Bitmap != 0)
		DeleteObject(m_Bitmap);
	// create Bitmap in memory
	if (m_Bitmap == NULL)	
	{
		ZeroMemory ( &m_ImageInfo, sizeof (BITMAPINFO) );
		m_ImageInfo.bmiHeader.biSize		= sizeof (BITMAPINFOHEADER);
		m_ImageInfo.bmiHeader.biWidth		= sizex;
		m_ImageInfo.bmiHeader.biHeight		= -sizey;
		m_ImageInfo.bmiHeader.biPlanes		= 1;
		m_ImageInfo.bmiHeader.biBitCount	= 32; 
		m_ImageInfo.bmiHeader.biCompression	= BI_RGB;
		m_ImageInfo.bmiHeader.biSizeImage	= 0;
	
		m_Bitmap=CreateDIBSection ( NULL, &m_ImageInfo, DIB_RGB_COLORS, (void **)&m_BmpBits, NULL, NULL ); 
	}
	// copy pallet
	memcpy(m_RGB,Pal,sizeof(RGBQUAD)*256);
	m_SizeX = sizex;
	m_SizeY = sizey;
	return true;
}

I have verified the this is called in the program and the bitmap is initialized when I open the file (does it need to initialize again?). The only information I can give on the exception is that it says DEBUG ASSERTION FAILED! and when I continue to try to debug it causes a break at this line

	ENSURE(SUCCEEDED(hr));
	Add(psi, strAppID);
#endif

does this help at all?

Re: Still trying to hunt down a runtime error in VS 2010, need suggestions

Richard MacCutchan8-Aug-11 21:18

Richard MacCutchan

8-Aug-11 21:18

AndrewG1231 wrote:
does this help at all?

Not really, you don't seem very sure about the usage of m_bitmap, and you fail to indicate exactly where the assertion occurs, and what variables and values cause it. Try to gather all information and copy any messages word for word.

Unrequited desire is character building. OriginalGriff

Re: Still trying to hunt down a runtime error in VS 2010, need suggestions [modified]

AndrewG12319-Aug-11 7:10

AndrewG1231

9-Aug-11 7:10

This seems like a common response, and I keep trying to find exactly where the assertion occurs but apparently not very successfully. Here is what keeps happening...I run the program in the debugger and execute the commands that lead to the error. I have put breakpoints all around the code where I think the problem has been occurring and I continue to walk through and try to identify the exact problem, however, I keep walking through different code sources that aren't program written (like the WndProc()). When I hit the error, I get a the Debug Assertion Failed and it gives me the path of some file on an f: drive I don't have (I think f: is just the c++ notation)...then it asks me to abort, retry, or ignore...retry, i get the message that my program has triggered a breakpoint and it goes right to the last section of code.

I have been tracking m_bitmap because it seems to hold the information from the CreateDIBSection() which I think is where all the bitmap information is stored.

I wish I knew what I could post to be more informative, but this is a large program with lots of classes....I have happily worked with all the suggestions on the site (which are awesome!) and will continue to try to get more information and hopefully get the program to work correctly.

modified on Tuesday, August 9, 2011 1:26 PM

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