C / C++ / MFC

25-Sep-09 5:04

using shell execute, open "timedate.cpl" Cool | :cool:

Semantics and naming conventions in MFC?

Vaclav_24-Sep-09 19:46

Vaclav_

24-Sep-09 19:46

Not a coding question but on bordeline, I’ll admit.
When I am using simple one row / two columns splitter window should I refer to left / right pane or view?
Same goes for tab view (or actually control) – is it a tab or view or page?
Similar dilemma for a tree view.
I guess what I am asking is – how to name my class so it is descriptive
CCamera or CCameraView or CCameraTab if it is a AVI frame in “splitter tab” ?
Thanks for reading.

Re: Semantics and naming conventions in MFC?

CPallini24-Sep-09 20:55

CPallini

24-Sep-09 20:55

Vaclav_Sal wrote:
When I am using simple one row / two columns splitter window should I refer to left / right pane or view?

I would go with a and b. Roll eyes | :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Semantics and naming conventions in MFC?

Richard MacCutchan24-Sep-09 22:50

Richard MacCutchan

24-Sep-09 22:50

Vaclav_Sal wrote:
should I refer to left / right pane or view?

When using a splitter window (or a Frame) I always put Views in each pane, so I would give them names such as IndexView, DetailView etc.

With Tab pages I would use Tab or Form as the suffix etc.

The main thing to consider is whether it makes sense to you and, more importantly, whether it would it make sense to someone else who had to maintain your code.

Dialog Box

hrishiS24-Sep-09 19:33

hrishiS

24-Sep-09 19:33

Hi to All,

I am a beginer in MFC.

I have added a new dialog box (property sheet_Medium) in my dialog based application. Now, i want to put a data-grid on the new dialog. Please tell me where do I write the code(to create the datagrid) for the same?.. I cannot see a OnInit method too. I want to show the grid when the dialog appears

Thanks in advance

-----------------------------
I am a beginner

Re: Dialog Box

«_Superman_»24-Sep-09 20:47

«_Superman_»

24-Sep-09 20:47

You should do it in the OnInitDialog function of the dialog.
If you don't see the function, you must add it yourself.

OnInitDialog is a virtual function defined in the CDialog class.
You can override it in your derived class.

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

Re: Dialog Box

David Crow25-Sep-09 3:37

David Crow

25-Sep-09 3:37

hrishiS wrote:
I have added a new dialog box (property sheet_Medium)...

Is this the name of your dialog class, or is the class derived from CPropertySheet?

How can i concate two bitmap to produce third combine bitmap

Game-point24-Sep-09 19:16

Game-point

24-Sep-09 19:16

my question is

How can i concate two bitmap to produce third combine bitmap ?

here is my code:

// Initilize the Image one<br />
	CImage __Imageone;<br />
	__Imageone.Load (L"D:\\2009\\testConsult.tif");<br />
<br />
	int nWidthone = __Imageone.GetWidth();<br />
	int nHeightone = __Imageone.GetHeight();<br />
<br />
	COLORREF __colorefone;<br />
<br />
	for (int i = 0 ; i < nWidthone ; i++)<br />
		for (int j = 0; j < nHeightone ; j++)<br />
			__colorefone = __Imageone.GetPixel (i,j);<br />
<br />

// Initialize the SecondImage<br />
<br />
	CImage __Imagetwo;<br />
	__Imagetwo.Load(L"D:\\2009\\Header.TIF");	<br />
	int nWidthtwo = __Imagetwo.GetWidth();<br />
	int nHeighttwo = __Imagetwo.GetHeight();<br />
	COLORREF __colortwo;<br />
	for (int x = 0 ; x < nWidthtwo ; x++)<br />
		for (int y = 0 ; y < nHeighttwo ; y++)<br />
			__colortwo = __Imagetwo.GetPixel(x,y);<br />
<br />

how to combine these two into one ??

Thanks !!!!

Re: How can i concate two bitmap to produce third combine bitmap

CPallini24-Sep-09 20:54

CPallini

24-Sep-09 20:54

For example:

CImage img[3];
img[0].Load(_T("D:\\2009\\testConsult.tif"));
img[1].Load(_T("D:\\2009\\Header.tif"));
int h, w , bpp;
HDC hdc;
w = img[0].GetWidth() + img[1].GetWidth();
h = img[0].GetHeight();
if (h < img[1].GetHeight()) h = img[1].GetHeight();
bpp = img[0].GetBPP();
if ( bpp < img[1].GetBPP()) bpp = img[1].GetBPP();
img[2].Create(w,h,bpp);

hdc = img[2].GetDC();
img[0].BitBlt(hdc, 0, 0);
img[1].BitBlt(hdc, img[0].GetWidth(), 0);
img[2].ReleaseDC();
img[2].Save(_T("img3.tif"));

Re: How can i concate two bitmap to produce third combine bitmap

Game-point24-Sep-09 21:01

Game-point

24-Sep-09 21:01

thanks mr.pall ..its really helpful 4 me

~~~~~~~~~~~~~Raju~~~~~~~~~~~~~

void

Benjamin Bruno24-Sep-09 18:16

Benjamin Bruno

24-Sep-09 18:16

Is 'void' a data-type?
If yes then why sizeof(void) shows compiler error?

Blush | :O

Re: void

CPallini24-Sep-09 20:32

CPallini

24-Sep-09 20:32

void stands for 'no-type-because-there-is no-value' (for instance as function argument or return value) or 'any-type' in expression like

void * p;

Since p can point, for instance, to char as well to double it make no sense an expression like sizeof(*p).
Smile | :)

Re: void

Stuart Dootson24-Sep-09 21:02

Stuart Dootson

24-Sep-09 21:02

void, in effect, == undefined, so (as it's not defined) cannot have a size.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: void

markkuk25-Sep-09 0:11

markkuk

25-Sep-09 0:11

Yes, according to the C99 standard:

"The void type comprises an empty set of values; it is an incomplete type that cannot be
completed."

Applying sizeof to an incomplete type is an error.

CListCtrl::FindItem crashes

Maxwell Chen24-Sep-09 18:03

24-Sep-09 18:03

With FindWindow and FindChildWindows API functions, I got the handle of SysListView32 control of mmsys.cpl panel. When I was trying to search the text of each entries on the ListCtrl, it always crashed.

My code snippet is as the below.

void CMainDlg::OnBnClickedGetDolby()
{
	// Kill any running window if any.
	KillRunningApplet(_T("Sound"));

	// Launch it.
	if(!LaunchCplApplet(_T("mmsys.cpl"), 0, 0)) {
		OutputDebugString(_T("LaunchCplApplet fails. \n"));
		return;
	}

	// Make sure the applet pops up.
	CWnd* pWnd = NULL;
	int i = 0;
	while(!pWnd) {
		pWnd = FindWindow(NULL, _T("Sound"));
		if(pWnd) {
			OutputDebugString(_T("Found Sound window. \n"));
			break;
		}
		Sleep(10);
		i++;
		if(i > 1000) {
			OutputDebugString(_T("Sound window is not found. \n"));
			return;
		}
	}

	// ---
	m_hListView = NULL;
	for(i = 0; i < 2; i++) {
		EnumChildWindows(pWnd->m_hWnd, DoSomethingHelper, (LPARAM)this);
		if(m_hListView) {
			OutputDebugString(_T("Got SysListView32"));
			break;
		}
		else {
			OutputDebugString(_T("SysListView32 is not found."));
			if(i == 1) {
				return;
			}
		}
	}

//	m_pListView->SendMessage(WM_KEYDOWN, VK_DOWN, 0);
//	m_pListView->SendMessage(WM_KEYDOWN, VK_DOWN, 0);

	CListView* pView = (CListView*)FromHandle(m_hListView);
	CListCtrl& Ctrl = pView->GetListCtrl();
//	Ctrl.ShowWindow(SW_HIDE); // <-- this line tells me that I got the right handle.

	LVFINDINFO info = {0};
	int iIndex = 0;

	info.flags = LVFI_PARTIAL | LVFI_STRING;
	info.psz = _T("Speaker\0");

	if((iIndex = Ctrl.FindItem(&info)) != -1) { // <-- crash at this line.
		OutputDebugString(_T("Speaker-like entry is found."));
	}

}

BOOL CALLBACK DoSomethingHelper(HWND hwnd, LPARAM lParam)
{
	TCHAR sClassName[MAX_PATH] = {0};
	GetClassName(hwnd, sClassName, MAX_PATH);
	if(wcscmp(sClassName, _T("SysListView32")) == 0) {
		CMainDlg* pMain = (CMainDlg*)lParam;
		pMain->m_hListView = hwnd;
	}
	OutputDebugString(sClassName);
	return TRUE;
}

Maxwell Chen

Naveen24-Sep-09 19:39

24-Sep-09 19:39

Which applicaion crashes? the applet or your application?

Re: CListCtrl::FindItem crashes [modified]

Maxwell Chen24-Sep-09 20:02

24-Sep-09 20:02

A dialog box popped up saying "Windows Shell Common DLL has stopped working". When I clicked [Close program] of that popup, the applet was gone but my application still was alive.

I traced into the source of MFC. The problem is the m_hWnd of that CListCtrl.

_AFXCMN_INLINE int CListCtrl::FindItem(LVFINDINFO* pFindInfo, int nStart) const
	{ ASSERT(::IsWindow(m_hWnd)); return (int) ::SendMessage(m_hWnd, LVM_FINDITEM, nStart, (LPARAM)pFindInfo); }

Maxwell Chen

modified on Friday, September 25, 2009 2:09 AM

Naveen24-Sep-09 20:08

24-Sep-09 20:08

hmm..

This is because you are passing a string pointer to another process. And when the other process try to access that pointer, exception occurs. You have to allocate the memoy in the target process( VirtualAllocEx() ), copy the string to that process' memory( WriteProcessMemory()). Then set that pointer in the LVM_FINDITEM structure and call FindItem().

Maxwell Chen24-Sep-09 20:38

24-Sep-09 20:38

I did this as the below, but pBuffer is bad_ptr and WriteProcessMemory returns fail.

LVFINDINFO info = {0};
int iIndex = 0;
TCHAR sTxt[MAX_PATH] = {0};
SIZE_T nByte = 0;
wcscpy(sTxt, _T("Speaker"));

info.flags = LVFI_PARTIAL | LVFI_STRING;

TCHAR* pBuffer = (TCHAR*)::VirtualAllocEx(m_hCplProcess, NULL, MAX_PATH, MEM_RESERVE, PAGE_READWRITE);
if(!WriteProcessMemory(m_hCplProcess, pBuffer, sTxt, MAX_PATH, &nByte)) {
    return;
}
info.psz = pBuffer;

if((iIndex = Ctrl.FindItem(&info)) != -1) {
    OutputDebugString(_T("Speaker-like entry is found."));
}

VirtualFreeEx(m_hCplProcess, pBuffer, MAX_PATH, MEM_RELEASE);

Maxwell Chen

Naveen24-Sep-09 21:48

24-Sep-09 21:48

Maxwell Chen wrote:
TCHAR* pBuffer = (TCHAR*)::VirtualAllocEx(m_hCplProcess, NULL, MAX_PATH, MEM_RESERVE, PAGE_READWRITE);

You have to pass flAllocationType as MEM_COMMIT|MEM_RESERVE

Maxwell Chen24-Sep-09 22:12