Re: Drawimage - C / C++ / MFC Discussion Boards

Re: Drawimage

Anu_Bala9-May-12 2:36

Anu_Bala

9-May-12 2:36

Check bmp file is avaialble in folder.Otherwise it returns NULL.

Anu

Re: Drawimage

john56329-May-12 2:35

john5632

9-May-12 2:35

Thanks its working...but what I need to change in code If I load a png/jpg image...

Re: Drawimage

enhzflep9-May-12 2:51

enhzflep

9-May-12 2:51

I use this code

C++

// BMP, GIF, JPEG, PNG, TIFF, Exif, WMF, and EMF
HBITMAP mLoadImg(WCHAR *szFilename)
{
    HBITMAP result=NULL;

    Gdiplus::Bitmap* bitmap = new Gdiplus::Bitmap(szFilename,false);
    bitmap->GetHBITMAP(NULL, &result);
    delete bitmap;
    return result;
}

Note: You have to startup and shutdown the GDI+ system. I usually do this in apps initialization and destruction (winmain or main if not mfc apps)

C++

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    Gdiplus::GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

    hInst = hInstance;
    InitCommonControls();
    // The user interface is a modal dialog box
    DialogBox(hInstance, MAKEINTRESOURCE(DLG_MAIN), NULL, (DLGPROC)DialogProc);
    Gdiplus::GdiplusShutdown(gdiplusToken);
}

Re: Drawimage

ThatsAlok9-May-12 21:13

ThatsAlok

9-May-12 21:13

MFC by default support only BMP file, however you can take services of different library that suits your need, one of them is gdiplus, search Google for more information

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Re: Drawimage

Chris Meech9-May-12 2:49

Chris Meech

9-May-12 2:49

You've not shown the code that actually draws the image, but I'll take a guess at the problem. In your first code snippet, it is a CBitmap instance that will be used for drawing. In your second snippet, it is a pointer to a Bitmap instance that is used. Your drawing code will need to be adjusted accordingly. Smile | :)

Chris Meech
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Re: Drawimage

john56329-May-12 2:54

john5632

9-May-12 2:54

, basically my motive is to draw image (png/jpg) using bitblt...I will adjust code accordingly.

Re: Drawimage

Anu_Bala9-May-12 18:09

Anu_Bala

9-May-12 18:09

See this link.It may help you.

http://stackoverflow.com/questions/2490661/how-to-load-png-jpeg-images-using-mfc[^]

Anu

Re: Drawimage

john56329-May-12 20:15

john5632

9-May-12 20:15

Thank you for help...I am able to draw image.

I need your help in one more problem as described below:

I need to draw image on the screen using XOR so that diff of 2 images can be draw as a complete image. How to solve this?

Re: Drawimage

wangafei9-May-12 21:03

wangafei

9-May-12 21:03

first you can get the path,then set ID and path link！
so，your first method can do it

Split window in MDI

Anu_Bala8-May-12 19:21

Anu_Bala

8-May-12 19:21

Hi, I want 3 split windows in my application,in that left for Tree control and Right window act as a main window and bottom window have list control to show some log of my application. For that i made this code..
in Mainframe.cpp(), in OnCreateClient()

if(!m_SplitterWnd.CreateStatic(this, 2, 1))         
		return FALSE;     
	
	CRect rect;     
	GetClientRect(&rect); 

	if(!m_SplitterWnd.CreateView(1, 0, RUNTIME_CLASS(CBottomView), CSize(rect.Width(), 50),  pContext))        
		return FALSE;       

	m_SplitterWnd.SetRowInfo(0, 800, 50);
	m_SplitterWnd.SetRowInfo(1, 330, 50);

	if (!m_SplitterWnd1.CreateStatic(&m_SplitterWnd, 1, 2, WS_CHILD | WS_VISIBLE | WS_BORDER |AFX_IDW_PANE_FIRST, m_SplitterWnd.IdFromRowCol(0,0)))     
	 	return FALSE;     
	       // first pane     

	if(!m_SplitterWnd1.CreateView(0, 0,  RUNTIME_CLASS(CTreeMenuView), CSize(rect.Width()/5,rect.Height()-50), pContext))	          
		return FALSE;      
	       //Second pane     
	
	if(!m_SplitterWnd1.CreateView(0, 1, RUNTIME_CLASS(CMainWindowView), CSize(rect.Width()-rect.Width()/5,rect.Height()-50), pContext))     
		return FALSE;  

		 	int nWidth=rect.Width();
	m_SplitterWnd1.SetColumnInfo(0, nWidth*0.25, 50);
	m_SplitterWnd1.SetColumnInfo(1, nWidth*0.75, 50);

	
	return CMDIFrameWnd::OnCreateClient(lpcs, pContext);

And i have to attach all my child window in right side window( CMainWindowView)..
In my app class,

pDocTemplate = new CMultiDocTemplate(IDR_MAINFRAME,
		RUNTIME_CLASS(CABBHarmonyDoc),
		RUNTIME_CLASS(CChildFrame), // custom MDI child frame
		RUNTIME_CLASS(CMainWindowView));
	if (!pDocTemplate)
		return FALSE;
	AddDocTemplate(pDocTemplate);

	pGraphViewTemplate = new CMultiDocTemplate(
		IDR_MAINFRAME,
		RUNTIME_CLASS(CABBHarmonyDoc),
		RUNTIME_CLASS(CChildFrame), 
		RUNTIME_CLASS(CGraphview));
	AddDocTemplate(pGraphViewTemplate);

So when i press F5,this GraphView should display in MainwindowView.
But it does not appear.Whats the mistake i did? Pls help me..

in Mianframe.cpp

void CMainFrame::OnGraphview()
{
		
 	if( pGraphDisplayFrame == NULL )
	{		
		CDocTemplate *pTemplate = theApp.pGraphViewTemplate;
		CABBHarmonyDoc* pDoc = new CABBHarmonyDoc;
		pGraphDisplayFrame = (CMDIChildWnd *)pTemplate->CreateNewFrame( pDoc ,NULL );
		if( pGraphDisplayFrame == NULL )
		{
			AfxMessageBox( "Unable to Create Graph Display" );
			return;
		}
		pTemplate->InitialUpdateFrame( pGraphDisplayFrame,NULL );
	}
	else
		MDIActivate( pGraphDisplayFrame );
	

}

When i debug, i found in winfrm.cpp,

void CFrameWnd::InitialUpdateFrame(CDocument* pDoc, BOOL bMakeVisible)
{
	// if the frame does not have an active view, set to first pane
	CView* pView = NULL;
	if (GetActiveView() == NULL)
	{
		CWnd* pWnd = GetDescendantWindow(AFX_IDW_PANE_FIRST, TRUE);		if (pWnd != NULL && pWnd->IsKindOf(RUNTIME_CLASS(CView)))
		{
			pView = (CView*)pWnd;
			SetActiveView(pView, FALSE);
		}
	}

Here pWnd returns NULL. Whats the mistake pls help me out.

Anu

Re: Split window in MDI

Jochen Arndt8-May-12 21:04

Jochen Arndt

8-May-12 21:04

You are allocating a new uninitialized instance of your document in OnGraphView() and use it for creation of the new frame. You should replace the pDoc parameter by your existing document.

You may also move the OnGraphView() handler from the main frame class to your document class (passing then this for the document pointer). Because the graph can be only shown when a document has been loaded.

Odd MFC Dialog Executable Behavior

wmallory8-May-12 8:20

wmallory

8-May-12 8:20

I have a bit of strange behavior with a MFC application that I haven't seen before.

The application is a simple MFC Dialog running unders Windows XP SP3 and using Visual Studio 2008. It builds fine under Debug and Release configurations. The Debug executable runs fine under the debugger and also within Visual Studio using the Start Without Debugging button. The Release executable runs fine directly from Windows.

However, the Debug executable does NOT run fine directly from Windows. When double clicked from Windows Explorer, there is a brief hourglass and then what appears to be a quick exit. No messages, no nothing. Adding a few AfxMessageBox calls to the app's CWinAppEx class, it appears that not only does the app's InitInstance method not get called, but even the CWinAppEx constructor does not get called. Obviously, this makes debugging the problem somewhat difficult.

Anyone seen similar behavior before? Seems like it might be a manifest problem of some sort, but I don't see why it would only affect the Debug executable and only directly from Windows.

Additional Info: With a little more testing, I found that this behavior occurs even in a simple test application as soon as I add any code that requires an internally developed DLL. Note that if I rename this DLL, I get the usual can't find the DLL message. So the app is finding the DLL, but for some reason, in Debug configuration, there's a problem only when running directly from Windows.

modified 8-May-12 14:47pm.

Re: Odd MFC Dialog Executable Behavior

David Crow8-May-12 9:26

David Crow

8-May-12 9:26

Does the "internally developed DLL" have any resources that are being used by the EXE or is it just exported functions that are being used?

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modified 9-May-12 9:17am.

Re: Odd MFC Dialog Executable Behavior

Code-o-mat8-May-12 10:32

Code-o-mat

8-May-12 10:32

Do you have the sources/project for this "internally developped DLL"? If yes, try the following: load the project for the DLL, build it and hit F5, VS should ask you to specify the executable you want to test your DLL with (if it doesn't, you can specify that somewhere in the project settings, can't recall where now), browse for your exe, select it and let it run (make it so it will load the DLL you just built, like, placing the executable right next to the DLL) and see if there are any exceptions thrown, check the debugger's output window too for any hints, maybe you will see something useful.

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> If it doesn't matter, it's antimatter.<

Diff of image

john56328-May-12 1:06

john5632

8-May-12 1:06

Hello Experts,

I need to transfer image via Socket, somtimes image may be same or may somewhat similar.
I am trying to get diffrenece of images so that I can be sent faster via socket.

Image type is jpeg...Please suggest how to send min data of image?

Re: Diff of image

David Crow8-May-12 2:49

David Crow

8-May-12 2:49

john5632 wrote:
I am trying to get diffrenece of images so that I can be sent faster via socket.

This may not be totally helpful, but it may help direct you.

Switch To Another Doc Template

002comp8-May-12 0:01

002comp

8-May-12 0:01

hello Friends

I come across to this situation first time and googled a lot but no Luck.
I am adding two multipleDocTemplates except their Document class is Different.

Now,I am opening a File using one Document template but I want to save that File using another Document template.
Where and how will i switch to another Doc Template so that when I save it uses another Doc template.

An Ideas??
Regards
Yogesh

Need help with my jump physics code

Seeker20027-May-12 19:46

Seeker2002

7-May-12 19:46

I need some help with the jump physics example I found on the web.

The following code makes my character go up and down, but I have to press and hold down the arrow-up key on my keyboard.

I want my character to complete a full jump cycle without having to hold the arrow-up key down.

I want to be able to press down on the key once and release to do a complete jump.

Do I need to somehow include a do while loop? :confused

Thanks! Smile | :)

C++

bool jumping;
const float step = 0.05f;      // how much the player will move per frame when jumping
const float limit = 1.0f;     // the maximum height the player can reach while jumping

if (GetAsyncKeyState(VK_UP)== TRUE)     // jump key
{

static float jump = 0.0f;
static float strength = limit;

if(jumping){

jump += step;

if(jump <= limit){

strength -= step;

player.y += (step * strength);
}
else{
strength += step;

// detect if moving the player down would put him below the ground
// 0.0f is assumed to be the ground here

if(player.y - (step * strength) <= 0.0f)){
player.y = 0.0f;

jumping = false;   // the player has landed
jump = 0.0f;
strength = limit;   // reset the strength
}

else{
player.y -= (step * strength);
}
}
}
// rest of rendering...
}

Re: Need help with my jump physics code

Chuck O'Toole7-May-12 19:55

Chuck O'Toole

7-May-12 19:55

OK, this code is posted "out of context" (it simply starts with the "if" statement, not how you got there).

A reasonable assumption given your problem statement is that this code is run as part of an "OnChar()" or other event *caused* by your holding a key down.

If that's the case, and you want to convert this to code that runs in a loop, you need to address two things.

1) what event starts the "jumping"?
2) what event stops the "jumping"?

Clearly, right now event 1) is you holding down a key, event 2) is when you let it go. Letting the key go is *not* an event, it's the absence of a key_down event. You'll need to figure out the "stop" event first.

Re: Need help with my jump physics code

Seeker20027-May-12 21:43

Seeker2002

7-May-12 21:43

Hi Chuck O'Toole,

thanks for the quick reply.

These are global variables:

bool jumping;
const float step = 0.05f;     // how much the player will move per frame when jumping
const float limit = 1.0f;     // the maximum height the player can reach while jumping

And the rest of the code below is contained inside of my game rendering function. The jump code works when I press the arrow-key, it just does't work correctly.

BOOL StartGame ()
{
if (GetAsyncKeyState(VK_UP)== TRUE)     // jump key
{

static float jump = 0.0f;
static float strength = limit;

if(jumping){

jump += step;

if(jump <= limit){

strength -= step;

player.y += (step * strength);
}
else{
strength += step;

// detect if moving the player down would put him below the ground
// 0.0f is assumed to be the ground here

if(player.y - (step * strength) <= 0.0f)){
player.y = 0.0f;

jumping = false;   // the player has landed
jump = 0.0f;
strength = limit;   // reset the strength
}

else{
player.y -= (step * strength);
}
}
}
// rest of rendering...
return TRUE;
}

Re: Need help with my jump physics code

CPallini8-May-12 0:03

CPallini

8-May-12 0:03

If I got you: use a tristate variable instead of a boolean, say jump_state.

C++

enum JumpState
{
  JS_IDLE,
  JS_START,
  JS_JUMPING
};

//..

jump_state = JS_IDLE; // initialization

// ...

// main loop
if (GetAsyncKeyState(VK_UP) == TRUE)
  if (jump_state == JS_IDLE)
    jump_state = JS_START;
else
  if (jump_state == JS_START)
    jump_state == JS_JUMPING;
//...


if ( jump_state == JUMPING)
{
  // here do a step of jumping movement
  if ( landed )
    jump_state == JS_IDLE;
}