C / C++ / MFC Discussion Boards

Vikram Kashyap19-Oct-04 19:14

19-Oct-04 19:14

Hi,;)

Yes, Certainly you can change the bitmap at run time during the MOUSEMOVE or on LBUTTONDOWN. Let's take the example of MOUSEMOVE

void CMouseDlg::OnMouseMove(UINT nFlags, CPoint point)
{
m_Image.GetWindowRect(&rect);
ClientToScreen(&point);
if(rect.PtInRect(point))
{
m_Image.SetBitmap(m_Bitmap1);
}
else
{
m_Image.SetBitmap(m_Bitmap2);
}
CDialog::OnMouseMove(nFlags, point);
}

Here m_Image is the control type variable of Image control created using Class Wizard and rect is CRect object.

// m_Image.GetWindowRect(&rect);
Extract the image control co-ordinates in a rect object.

// ClientToScreen(&point);
ClientToScreen is used to convert the client coordinates of a given point or rectangle on the display to screen coordinates.

Next step is to check whether these points fall under the area where our image is place on the screen using PtInRect. If yes, then change the bitmap to whatever.

m_Bitmap1 and m_Bitmap2 are twom CBitmap type objects defined in the header file.

That's it...you r on ur way to change the bitmaps at runtime

Vikram Kashyap
"You will never fail until you stop trying"

Proper function declaration to avoid a memory leak

georgiek5019-Oct-04 8:47

georgiek50

19-Oct-04 8:47

I have a function which returns a char* and I am trying to avoid a memory leak.

So far it is in this format:

char* MyFunction(char *szBuffer)
{
char *szTmpBuffer = new char[strlen(szBuffer) + 1];

...function body...

return szTmpBuffer;
}

And it is called somewhat like this:

char *szBuffer = MyFunction(szString);

but if after I use szBuffer I try to delete it:

delete [] szBuffer;

I get a Debug Assertion failed...so the question is, what is the proper way to call new within a function then delete the pointer outside of the function w/o causing errors and avoiding memory leaks?

Re: Proper function declaration to avoid a memory leak

David Crow19-Oct-04 8:56

David Crow

19-Oct-04 8:56

You code is fine. I tried it and no assertion was fired. What line/file does the assertion message indicate?

"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow

Re: Proper function declaration to avoid a memory leak

Joaquín M López Muñoz19-Oct-04 9:06

Joaquín M López Muñoz

19-Oct-04 9:06

The handling of szTmpBuffer you show is OK. Most likely, you're overwriting the allocated space. What does the debug assertion message look like? Something about damaged blocks?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
Want a Boost forum in Code Project? Vote here[^]!

Re: Proper function declaration to avoid a memory leak

georgiek5019-Oct-04 9:12

georgiek50

19-Oct-04 9:12

Exactly:

DAMAGE: after normal block (#3604) at (memory address)

Re: Proper function declaration to avoid a memory leak

georgiek5019-Oct-04 9:16

georgiek50

19-Oct-04 9:16

Yep, I was overwriting...thanks for pointing out my stupid mistakes Poke tongue | ;-P

Resize a Static Box to accomodate font change

Ali Niaz19-Oct-04 8:40

Ali Niaz

19-Oct-04 8:40

I needed some help with resizing the size of the Static box after I have changed the font size. I want to dynamically change the size of the box so that it perfectly fits the text inside it. I wanna do this because I want the box border to fit the text inside.
i've tried :

CDC* pDC = pOrderText->GetDC();
CString text;
pOrderText->GetWindowText(text);
CSize stringSize = pDC->GetTextExtent(text);
pOrderText->SetWindowPos(NULL, 0, 0, stringSize.cx *1.45, stringSize.cy *1.45, SWP_NOMOVE|SWP_NOZORDER|SWP_NOREPOSITION);

buts the conversion is not working well. Need help asap!

A

Re: Resize a Static Box to accomodate font change

BlackDice19-Oct-04 9:58

BlackDice

19-Oct-04 9:58

Try getting the ratio of the windowsize/textsize before you change the font. Or, maybe you can use DrawText() with a flag of DT_CALCRECT to get the size of the rectangle needed by your control, then use the rect's width and height properties to set the width and height for your call to SetWindowPos()

Who are all these people and what are they doing in my house?...Me in 30 years, inside a grocery store

My articles[^]

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Re: Resize a Static Box to accomodate font change

Ali Niaz19-Oct-04 11:28

Ali Niaz

19-Oct-04 11:28

I tried this as well. But it still does not reflect the change in the font when it draws the text. Any other suggestion.?
Right now I am doing the hardcoded windowsize/textsize , but its not perfect in all the scenarios.

ali

Re: Resize a Static Box to accomodate font change

BlackDice20-Oct-04 5:59

BlackDice

20-Oct-04 5:59

I think I might have misunderstood you. Is the font size not changing at all, or is the font size changing and the window size not changing?

Who are all these people and what are they doing in my house?...Me in 30 years, inside a grocery store

My articles[^]
bdiamond Sleepy | :zzz:

Re: Resize a Static Box to accomodate font change

Ali Niaz20-Oct-04 10:33

Ali Niaz

20-Oct-04 10:33

the font size is changing but the window size is not changing accordingly.

ali

Re: Resize a Static Box to accomodate font change

Ali Niaz19-Oct-04 10:11

Ali Niaz

19-Oct-04 10:11

Anybody?

Question regarding Forms App in VC++ .NET

NietzscheDisciple19-Oct-04 8:01

NietzscheDisciple

19-Oct-04 8:01

Hello All,

I'm new to coding in VC++ .NET, but have some experience writing applications in C# .NET.

I'm in the process of writing an app for which most of the code is in C++.

My question is this:

1. Can I use the Designer in my VC++ project (modifying the file Form1.h) to create the GUI?

OR

2. Do I need to follow the method suggested in the following LINK and design the GUI in a C# file and then tie it to the C++ code?

Which approach is preferable?

Thanks!

VC6 / Debug output: supress "Loaded xyz.dll..."

peterchen19-Oct-04 7:12

peterchen

19-Oct-04 7:12

Is there a possibility to supress the
Loaded 'xyz.dll', no matching symbolic information found.

debugger output in VC6 (or in general=? I have a lot of deferred loading, and it'x getting in the way of my boostrap traces.

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist Fold With Us! || Agile Programming | doxygen

Re: VC6 / Debug output: supress "Loaded xyz.dll..."

Ryan Binns19-Oct-04 18:25

Ryan Binns

19-Oct-04 18:25

I've never found a way to suppress this. It's damn annoying!

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

VC6 / Debug output: supress "Loaded xyz.dll..."

peterchen19-Oct-04 7:12

peterchen

19-Oct-04 7:12

Is there a possibility to supress the
Loaded 'xyz.dll', no matching symbolic information found.

debugger output in VC6? I have a lot of deferred loading, and it'x getting in the way of my boostrap traces.

we are here to help each other get through this thing, whatever it is Vonnegut jr.

sighist Fold With Us! || Agile Programming | doxygen

Data excahnge between dialog and formview

Zombie_Inc19-Oct-04 7:11

Zombie_Inc

19-Oct-04 7:11

Hi,

I am currently working on a SDI project with CFormView as the base class. From the menu (IDR_MAINFRAME) the user can open different dialog boxes. In one of the dialog boxes I have a listbox. When the user selects an item from the listbox and click the ok button to confirm the choice and close the dialog box, I need to update a variable (int) in the CFormView derived class and also update the view, like Invalidate() method.

I have not been able to find the ansver on the web. Any code snippet or links would be highly appreciated.

Thanks in advance!

Re: Data excahnge between dialog and formview

Wes Aday19-Oct-04 10:34

Wes Aday

19-Oct-04 10:34

It's really not that difficult. If I understand what you are trying to do, it's as easy as:

int formview = dialog.listbox.getcursel();

Artificial intelligence is no match for natural
stupidity.

Re: Data excahnge between dialog and formview

Zombie_Inc19-Oct-04 23:56

Zombie_Inc

19-Oct-04 23:56

Thanks for your reply!

I don't think it is that simple. Here is some more details of what I got:

SDI Project

Dialog1:
Properties - No border and style child (shown when the app starts)
CMyView is derived from CFormView
There is no controls on it!
A variable of type int m_Myint is declared

Dialog2:
Properties - Dialog frame and style popup (shown as modal when selected from the main menu)
CMyDlg is derived from CDialog
Has a button m_MyConfirmationButton and a ListBox m_MyListBox on it.

Question:
When the user clicks m_MyConfirmationButton the variable m_Myint in CMyView should be updated with the index number of the selected item in m_MyListBox.

Do I need pointers in the AppName.cpp Class where the CMyDlg DoModal() function is or???

I'm a bit lost here.

Thanks in advance!

Excel automation - closing Excel

jackamus19-Oct-04 6:54

jackamus

19-Oct-04 6:54

Hi All,

I am using excel automation to load a .csv file and save it as an excel workbook using the following code:

COleVariant _optional((long)DISP_E_PARAMNOTFOUND, VT_ERROR);
COleVariant _false((VARIANT_BOOL)FALSE);
COleVariant _true((VARIANT_BOOL)TRUE);
COleVariant _zero(0L);
COleVariant _two(2L);

CString sFileName("TestFile.csv");

_Application app;
if(app.CreateDispatch(_T("Excel.Application")))
{
app.SetDisplayAlerts(FALSE);
app.SetVisible(FALSE);
app.SetUserControl(FALSE);

Workbooks wbs = app.GetWorkbooks();

// Load the csv into a workbook
_Workbook newWB = wbs.Open(sFileName, _zero, _false, _two, _optional, _optional, _true, _optional, _optional, _optional, _optional, _optional, _false);

newWB.SaveAs(COleVariant("TestFile.xls"), COleVariant((long)-4143), _optional, _optional, _optional, _optional, 1, _optional, _optional, _optional, _optional);

app.Quit();
app.ReleaseDispatch();
}

This code works fine and creates the Excel workbook as required. However, it leaves an instance of Excel running (visible in Task Manager). How do I ensure the instance of Excel is closed down correctly?

If I remove the wbs.Open() it runs and shuts down Excel correctly so I suspect the problem is releated to an iDispatch created during the Open() which is never released.

Any ideas?

Thanks,
Jack

Re: Excel automation - closing Excel

David Crow19-Oct-04 8:29

David Crow

19-Oct-04 8:29

I tried your code and it worked as expected. Excel was open for a brief moment but was quickly shut down.

"Opinions are neither right nor wrong. I cannot change your opinion of me. I can, however, change what influences your opinion." - David Crow

XML Document always empty... why?

Chris Ulliott19-Oct-04 6:47

Chris Ulliott

19-Oct-04 6:47

Code below... cant understand why saved document is always completely empty. Any help appreciated, Thank you in advance.

hr = m_pXMLDoc->put_async(VARIANT_FALSE);<br />
if (FAILED(hr))<br />
{<br />
	ErrHandler(hr);	  <br />
}<br />
// We do not wish to validate when parsing in<br />
hr = m_pXMLDoc->put_validateOnParse(VARIANT_FALSE);<br />
if (FAILED(hr))<br />
{<br />
	ErrHandler(hr);<br />
}<br />
// During parse do not resolve external files<br />
hr = m_pXMLDoc->put_resolveExternals(VARIANT_FALSE);<br />
if (FAILED(hr))<br />
{<br />
  ErrHandler(hr);<br />
}<br />
<br />
...<br />
<br />
CComVariant vType(MSXML2::NODE_ELEMENT);<br />
m_pXMLDoc->createNode(vType,_T("ROOT"), _T(""), &DOMRootNodePtr);<br />
<br />
for(nRecord = nRecord; nRecord < paryData->GetSize(); nRecord++)<br />
{<br />
	pRow = paryData->GetAt(nRecord);<br />
	if(pRow)<br />
	{<br />
		if(m_straryFields.GetSize() != pRow->fields.GetSize())<br />
			return -1;<br />
<br />
		for(nLoop=0; nLoop < pRow->fields.GetSize(); nLoop++)<br />
		{<br />
			// output field name and data to export file<br />
			str = pRow->fields.GetAt(nLoop);<br />
			str.Replace(_T(' '), _T('_'));<br />
			str.Replace(_T('('), _T('_'));<br />
			str.Replace(_T(')'), _T('_'));<br />
			strField = m_straryFields.GetAt(nLoop);<br />
			strField.Replace(_T(' '), _T('_'));<br />
			strField.Replace(_T('('), _T('_'));<br />
			strField.Replace(_T(')'), _T('_'));<br />
			bstr = str.AllocSysString();<br />
			bstrField = strField.AllocSysString();<br />
<br />
			CComVariant vType(MSXML2::NODE_ELEMENT);<br />
			m_pXMLDoc->createNode(vType,bstrField, _T(""), &DOMNodePtr);<br />
			hr = DOMRootNodePtr->appendChild(DOMNodePtr, &DOMNodePtr);<br />
			if(FAILED(hr))<br />
				ErrHandler(hr);<br />
			else<br />
			{<br />
				CComVariant vTextType(MSXML2::NODE_TEXT);<br />
				hr = m_pXMLDoc->createTextNode(bstr, &DOMTextNodePtr);<br />
				if(FAILED(hr))<br />
					ErrHandler(hr);<br />
				else<br />
				{<br />
					DOMNodePtr->appendChild(DOMTextNodePtr, NULL);<br />
				}<br />
			}<br />
		}<br />
	}<br />
}<br />
<br />
<br />
try<br />
{<br />
	VARIANT var;<br />
	VariantInit(&var);<br />
	V_BSTR(&var) = SysAllocString(m_strFilename);<br />
	V_VT(&var) = VT_BSTR;<br />
<br />
	hr=m_pXMLDoc->save(var);<br />
<br />
	if(FAILED(hr))<br />
		ErrHandler(hr);<br />
	hr=m_pXMLDoc->Release();<br />
		<br />
}<br />
catch(...)<br />
{<br />
	ASSERT(FALSE);<br />
}

I get no errors at all but the xml document that is created is always empty.

Thank you in advance,
Chris

Re: XML Document always empty... why?

Doug Mitchell19-Oct-04 7:24

Doug Mitchell

19-Oct-04 7:24

You need to append the top level node to the m_pXMLDoc->documentElement.

Execute a *.exe inside my application

illidan9919-Oct-04 6:25

illidan99

19-Oct-04 6:25

Hi, I'm Javier. I'm developing an application in VC++. I want to run another application(B) inside my application(A). In this moment the application B takes control and when it's closed, then my application A retakes the control. ¿Which function or class can I use for this?

And anyone knows what's the similar to use in embedded Visual C++ for the equivalent PocketPC application?

Thank you!. Big Grin | :-D

Re: Execute a *.exe inside my application

Chris Meech19-Oct-04 7:26

Chris Meech

19-Oct-04 7:26

Lookup CreateProcess api for starting the other .exe.
Lookup WaitForSingleOnject api for 'waiting' for the .exe to end.

Chris Meech

I am Canadian. [heard in a local bar]

..a scientist venturing into the fields of philosophy and metaphysics is like Tie Domi figure skating. It's not a pretty sight. [Toronto Star Article]

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