C / C++ / MFC

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

10-Aug-11 2:45

It's difficult to figure out, but are you sure the m_Bitmap member is valid?

One thing to remember is that you have to stash bitmap handles in the class, or they are destoyed after processing of the of the message, in this case WM_PAINT.

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

AndrewG123110-Aug-11 9:49

AndrewG1231

10-Aug-11 9:49

It is a valid pointer the first time it is called, but the second time it is initializes something is going wrong (it is remaining NULL when it should contain the information for the bitmap). However, they are destroyed after processing in my code. Here is the part of the bitmap processing code with the constructor/destructor through the "render" member where the flag of (m_Bitmap==NULL) becomes true and I get the message "Bitmap not init" (note, the 'a' in the code is my signal that this is code section telling me something is going wrong). Still, it works when the bitmap is first opened by the program, but not when I try to manipulate the image that results in the document being copied to a new window(CopyDoc is called).

CWinSTMBmp::CWinSTMBmp(void)
{
    ZeroMemory(&m_HistogramData,sizeof(int)*256);
    m_ImageMode     = IMAGE_MODE_HORIZONTAL;
    m_Inversion     = false;
    m_Derivative    = false;
    m_LineDC        = false;
    m_Render        = false;
    m_Bitmap        = NULL;
    m_BmpBits       = NULL;
    m_SizeX         = 0;
    m_SizeY         = 0;

}

CWinSTMBmp::~CWinSTMBmp(void)
{
    if(m_Bitmap != NULL)
        DeleteObject(m_Bitmap);
}

bool CWinSTMBmp::Init(int sizex, int sizey, RGBQUAD* Pal)
{
    // if bmp already exists, delete it and start over

    if (m_Bitmap != NULL)
    {
        DeleteObject(m_Bitmap);
        m_Bitmap=NULL;
    }
    // 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;
}

HBITMAP CWinSTMBmp::GetHBitmap(void)
{
    return HBITMAP(m_Bitmap);
}

BITMAPINFO* CWinSTMBmp::GetBmpInfo(void)
{
    return &m_ImageInfo;
}

bool CWinSTMBmp::Render(int* Data,int Min, int Max)
{


    if(Data == NULL)
    {
        AfxMessageBox("Passing in a NULL Data Ptr");
        return false;
    }

    if(m_Bitmap == NULL)
    {
        AfxMessageBox("aBitmap has not been init");
        return false;
    }

Do you happen to know what the

return HBITMAP(m_Bitmap);

is doing?

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

Charles Oppermann10-Aug-11 10:15

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

10-Aug-11 10:15

Couple of ideas:

m_Bitmap=CreateDIBSection ( NULL, &m_ImageInfo, DIB_RGB_COLORS, (void **)&m_BmpBits, NULL, NULL );

That could be failing and not setting m_Bitmap correctly.

C++

return (HBITMAP)(m_Bitmap);

Is casting m_Bitmap to a HBITMAP (bitmap handle).

What is m_Bitmap defined as? A CBitmap?

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

AndrewG123110-Aug-11 10:29

AndrewG1231

10-Aug-11 10:29

There may be a problem with the first line, but I can't figure out why it initializes the first time I open the file but not when I try to use it. Regarding the second line..is that the same as the HBITMAP(m_Bitmap)? Is what you have shown the proper way to code the line?

As far as I can tell in the header file m_Bitmap is of type HBITMAP, see below:

class CWinSTMBmp
{
public:
	CWinSTMBmp(void);
	~CWinSTMBmp(void);
	bool		Init(int sizex, int sizey, RGBQUAD* Pal);
	void		SetLineDC(bool enable);
	void		SetInversion(bool enable);
	void		SetDer(bool enable);
	void		UpdatePallet(RGBQUAD* Pal);
	HBITMAP		GetHBitmap(void);
	BITMAPINFO*	GetBmpInfo(void);
	RGBQUAD*	GetBmpBits(void);
	void		SetProperties(bool Derivative, bool LineDC, int Direction, bool Invert);	// Sets all rendering parameters
	void		DeleteBmp(void);
	bool		Render(int* Data, int Min, int Max);
	bool		RenderUI(unsigned short* Data, int Min, int Max);
	bool		RenderMetaBmp(int * Data, int Min = 0, int Max = 0);
	int*		GetHistogramData(void);

	bool		m_Render;				// true it bmp needs to be drawn
	bool		m_Derivative;			// derivative shading
	bool		m_LineDC;				// Linear DC filter
	bool		m_Inversion;			// colormap inversion
	RGBQUAD		m_RGB[256];				// colors for drawing
	HBITMAP		m_Bitmap;				// bitmap for 'the image'
	RGBQUAD		*m_BmpBits;				// pointer to the bits in the bitmap
	BITMAPINFO	m_ImageInfo;			// struct for creating m_Bitmap
	int			*m_DataPtr;				// pointer to data
	int			m_HistogramData[256];	// histogram data
	int			m_SizeX,
				m_SizeY;
	int			m_ImageMode;
	int			m_Max,
				m_Min;


	void NewLUT(RGBQUAD* newRGB);
};

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

Charles Oppermann10-Aug-11 10:42

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

10-Aug-11 10:42

You're probably trying to use the bitmap handle after it's been destroyed. Having the handle to the bitmap is not the same as having the bitmap itself. Generally I keep a CBitmap object in my class definition.

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

AndrewG123117-Aug-11 12:36

AndrewG1231

17-Aug-11 12:36

I tried what was suggested and have received the following message when I try to manipulate the image using the 'autoplane function'. The error is not occurring at all when I open a new image, but only when a new widow is opened in response to manipulation.

Data4   CXX0017: Error: symbol "IID_IShellItem" not found

This is the value that is causing the problem in for setting the value of hr to E_INVALIDARG. Visual Studio's debugger mentions something about the "value for this item being stale when trying to evaluate it"

What does it mean for a value to be stale?

modified on Wednesday, August 17, 2011 7:22 PM

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

Charles Oppermann9-Aug-11 10:40

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

9-Aug-11 10:40

The path is where the original source code was compiled. In this case, it's from the MFC Debug library, and the code was compiled on some Microsoft server.

Fortunetely, you have a copy of the MFC source code in the Visual Studio directory under .\VC\atlmfc\src

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

Code-o-mat8-Aug-11 22:15

Code-o-mat

8-Aug-11 22:15

AndrewG1231 wrote:

if (m_Bitmap != 0)
    DeleteObject(m_Bitmap);
// create Bitmap in memory
if (m_Bitmap == NULL)

Is DeleteObject in the above code the same as this[^]? Because this one does not make m_Bitmap NULL. So in this case, you check if m_Bitmap is not NULL, if it is not, you try to destroy the GDI resource (a bitmap i assume), after this m_Bitmap holds an invalid handle, then if (m_Bitmap == NULL) will be false, so it goes on happily with the invalid handle. Could this cause your problem?

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

Rolf Kristensen9-Aug-11 10:30

Rolf Kristensen

9-Aug-11 10:30

Try to activate Application Verifier[^] Filters for your application, and start your program in a debugger.

Using Application Verifier Within Your Software Development Lifecycle[^]
Testing Applications with AppVerifier [^]

What does WS_EX_TRANSPARENT really mean ?

Cold_Fearing_Bird8-Aug-11 6:21

Cold_Fearing_Bird

8-Aug-11 6:21

I am not really clear about the concept of WS_EX_TRANSPARENT, when it used with a main window, it is not transparent at all, sometimes used with a control window, it does disappear from the parent window. Some people say it's not visually transparent, but we can click through it that the windows beneath will receive the mouse msg.
Do you know what this sytle really means? and in what condition it will work otherwise won't?

Re: What does WS_EX_TRANSPARENT really mean ?

«_Superman_»8-Aug-11 6:35

«_Superman_»

8-Aug-11 6:35

This link will probably help you - How to make a transparent and click-through window[^]

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

Microsoft MVP (Visual C++)

Polymorphism in C

In MFC, How to avoid GUI long time waiting?

yu-jian8-Aug-11 4:57

yu-jian

8-Aug-11 4:57

An application need to use the sdk to send and receive data with remote computer. But the network case is bad, the application uses the main thread to send and receive data, so the GUI is no-response in several seconds. It is bad for the users. The Main Class is derived from a interface, the sdk calls the callback function of application to transfer data. Is there any design pattern to avoid GUI's long-time no-response?

Re: In MFC, How to avoid GUI long time waiting?

BadJerry8-Aug-11 5:12

Re: In MFC, How to avoid GUI long time waiting?

8-Aug-11 5:12

Start a thread (with AfxBeginThread for instance) passing the parameters you need and the m_hWnd of your window and make the long call in the static threaded function
Once you get the results in the thread, call PostMessage with the m_hWnd and the results...
Trap the message in your dialog with ON_MESSAGE

That's the short story...

Albert Holguin8-Aug-11 9:22

Albert Holguin

8-Aug-11 9:22

That's pretty much it... Any significant work should be on its own thread.

Re: In MFC, How to avoid GUI long time waiting?

pix_programmer9-Aug-11 20:45

pix_programmer

9-Aug-11 20:45

BadJerry wrote:
call PostMessage with the m_hWnd and the results...

Trap the message in your dialog with ON_MESSAGE

Can you post some sample code for this?

MFC in Xcode

BadJerry8-Aug-11 3:45

8-Aug-11 3:45

I am trying to port my MFC project to iPhone... is there some resources somewhere about some of the core (non GUI) MFC objects ported to XCode?
I have found on codeproject a good CString replacement
CString-clone Using Standard C++[^]

I am looking for COleDateTime... the CArray's MFC source code seems to compile!

Any pointer welcome!
Jerry

Chris Meech8-Aug-11 4:32

Chris Meech

8-Aug-11 4:32

BadJerry wrote:
the CArray's MFC source code seems to compile!

I'm not sure that this is a good thing.

But good luck with the port. I've always thought that porting MFC apps was similar to herding fish. Smile | :)

Chris Meech
I am Canadian. [heard in a local bar]

In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]

posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

BadJerry8-Aug-11 5:14

8-Aug-11 5:14

I think that re-writing code in another language for another platform and expecting the same beaviour on both platforms was like herding fish...

But thanks - luck I need!

BadJerry8-Aug-11 5:15

8-Aug-11 5:15

Alternatively if someone had the source code for VariantTimeToSystemTime, I'd be interested!

Code-o-mat8-Aug-11 7:22

Code-o-mat

8-Aug-11 7:22

Check out the WINE[^] implementation, maybe it helps.

> 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.<

BadJerry8-Aug-11 23:31

8-Aug-11 23:31

Excactly what I needed!

Code-o-mat9-Aug-11 0:48

Code-o-mat

9-Aug-11 0:48

> 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.<