Re: Assertion faliur when window is min and then max [modified] - C / C++ / MFC Discussion Boards

Re: Method overloading

Jun Du2-Jul-06 9:41

Jun Du

2-Jul-06 9:41

Yes, but be careful with default argument. The following does NOT work:

int foo(int number); 
int foo(int number1, int number = 0);

Basically, any ambiguity the compiler cannot resolve will not work.

Best,
Jun

Using OpenProcess

capricious_0012-Jul-06 1:29

capricious_001

2-Jul-06 1:29

Hi guys,

I am trying to use openprocess however I am running into a few problems. Specifically for the last parameter of the function OpenProcess, I am wondering how would I retreive the process id using hwnd retrieved from FindWindow? I have tried GetProcessId however that doesnt seem to work. I get a compiler error saying that its an undeclared identifier. However I have included windows.h so there should not be any problems. Would anyone know how to get the process id of a window handle?

Thanks,

Robbie

Re: Using OpenProcess

ovidiucucu2-Jul-06 1:56

ovidiucucu

2-Jul-06 1:56

First note that GetProcessId requires at least Windows XP or Windows Server 2003.

Call GetWindowThreadProcessId and OpenProcess:

DWORD dwProcessID = 0;
::GetWindowThreadProcessId(hWnd, &dwProcessID);
HANDLE hProcess = ::OpenProcess(PROCESS_QUERY_INFORMATION,
                                FALSE,
                                dwProcessID);
if(NULL != hProcess)
{
   // enjoy of hProcess;
   // ...
   ::CloseHandle(hProcess);
}
else
{
   // ... oups, error!
   DWORD dwError = ::GetLastError();
   // ...
}

Ovidiu Cucu
Microsoft MVP - Visual C++

Re: Using OpenProcess

capricious_0012-Jul-06 1:59

capricious_001

2-Jul-06 1:59

lol I just saw and used that from the MSDN and it worked. Thanks for confirming thats the right one to use!

Re: Using OpenProcess [modified]

ovidiucucu2-Jul-06 2:17

ovidiucucu

2-Jul-06 2:17

You are welcome!
BTW. Is MSDN really so funny to "lol", or just my answer ? Wink | ;)

Ovidiu Cucu
Microsoft MVP - Visual C++

Re: Using OpenProcess

capricious_0012-Jul-06 4:08

capricious_001

2-Jul-06 4:08

I've skewed the meaning of "lol" so much that I end up including it in almost every post even if I have a straight face, but if I had to literally have a chuckle at your answer then it would have to be corniest joke I would have ever laughed at Wink | ;)

Assertion faliur when window is min and then max [modified]

Tara142-Jul-06 1:18

Tara14

2-Jul-06 1:18

Hi,

I have a login dialog on which there is a logo. In the OnPaint() function I have added some code to make the logo transparent.

But everytime I minimize the login dialog box and then maximise it again, I get Debug assersion failure. But if I do not minimize it, then the rest of the program works fine.

I am not able to figure out what I must do to correct this. If I block out the code in the OnPaint() function, this problem dosen't occure.

void CLogin::OnPaint() 
{

	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here
	CRect rect;
	GetDlgItem(IDC_STATIC_MJ)->GetWindowRect(&rect);
	ScreenToClient(&rect);

	COLORREF clrDlg = GetSysColor(COLOR_BTNFACE); // dialog colour

	m_bitmap.LoadBitmap ( IDB_MJ_SOFTWARE ) ;
	CBrush mybrush, *oldbrush ;
	
	mybrush.CreateSolidBrush ( clrDlg ) ;
	oldbrush = dc.SelectObject ( &mybrush ) ;

	Display ( &dc, rect.left , rect.top , RGB ( 255, 255, 255 ) ) ; //color to block out
	mybrush.DeleteObject( ) ;
	dc.SelectObject ( oldbrush ) ;


	// Do not call CDialog::OnPaint() for painting messages
}

Please can you tell me what I am doing wrong here.
Thanks,
Tara

Fortitudine Vincimus!

-- modified at 7:20 Sunday 2nd July, 2006

Re: Assertion faliur when window is min and then max [modified]

ovidiucucu2-Jul-06 2:14

ovidiucucu

2-Jul-06 2:14

First
Check if m_bitmap has already a bitmap attached:

if(NULL == m_bitmap.GetSafeHandle())
{
   m_bitmap.LoadBitmap (IDB_MJ_SOFTWARE);
}

Second
DO NOT delete a GDI object which is currently selected in a device context.
Set it free by a call of dc.SelectObject(oldbrush) BEFORE calling mybrush.DeleteObject().

Aside note: in your code it's not even necessary to call mybrush.DeleteObject() because anyhow it is deleted when out-of-scope.

Ovidiu Cucu
Microsoft MVP - Visual C++

-- modified at 3:23 Monday 3rd July, 2006

Re: Assertion faliur when window is min and then max

Tara142-Jul-06 2:34

Tara14

2-Jul-06 2:34

Thanks a lot.

Its working now.

I used GetSafeHdc() but it was still giving error. But I understood that before loding a bitmap to m_bitmap, I must free it. So I used m_bitmap.DeleteObject(); and, of course the second point that you stated.

Thanks once again.

Fortitudine Vincimus!

Re: Assertion faliur when window is min and then max

ovidiucucu2-Jul-06 21:29

ovidiucucu

2-Jul-06 21:29

Oups, I made a mistake in my previous answer.
I just have corrected it.

Also as long as we have not a CBitmap pointer, you can directly test m_hObject member instead of call GetSafeHandle, like WhiteSky already suggested.

Ovidiu Cucu
Microsoft MVP - Visual C++

Re: Assertion faliur when window is min and then max

Tara142-Jul-06 21:48

Tara14

2-Jul-06 21:48

SO, the reason that the assersion failure occurs is that when the dialog is minimised and then maximised, and the onPaint() function is called, the bitmap object tries to load an already loaded object. Is that correct?

Therefore, one must either delete the object before calling Load or check whether it is NULL, and call Load only if it is.

Fortitudine Vincimus!

Re: Assertion faliur when window is min and then max

Hamid_RT2-Jul-06 19:22

Hamid_RT

2-Jul-06 19:22

You can use

if (m_bitmap.m_hObject==NULL) <br />
m_bitmap.LoadBitmap ( IDB_MJ_SOFTWARE ) ;

whitesky

CRichEditCtrl - calculate how many visible lines?

rambuts2-Jul-06 1:11

rambuts

2-Jul-06 1:11

Hi all,

I am having trouble to calculate precisly how many visible lines (according to the font currently selected) i have in my CRichEditCtrl derived class.

here is the code snippet:

// this event is EN_CHANGE

void CMyRichEditCtrl::OnEdtChange()
{
        CDC* pDC = GetDC();
	int nTxtLen = GetWindowTextLength();
	SetSel(nTxtLen,nTxtLen);
	CHARFORMAT2 cf;
	GetSelectionCharFormat(cf);
	int nFontSize = cf.yHeight / 20;
	int nFontHeight = -MulDiv(nFontSize, GetDeviceCaps(pDC->m_hDC, LOGPIXELSY), 72);
	nFontHeight *= -1;
	ReleaseDC(pDC);
	CRect rc;
	GetRect ( rc );
	int nVisibleLines = rc.Height() / nFontHeight; 
	nVisibleLines -= 3;
	int nTotalLines = GetLineCount();
	int nDelta = nTotalLines - nVisibleLines;
        // ... do something with nDelta
}

trouble is , the calculation i get is incorrect, especially when i change the font size.....

can any1 help?

thanks in advanced

Rami

reverse of QueryDosDevice

Mila0251-Jul-06 23:52

Mila025

1-Jul-06 23:52

Hi,
I'm looking for function which works reverse of QueryDosDevice. I've got a "\\Device\\HarddiskVolume1" and I want to translate it to drive letter.

-----------
Mila

Re: reverse of QueryDosDevice

Randor 2-Jul-06 0:20

Randor

2-Jul-06 0:20

<br />
TCHAR GetDriveLetter(LPCTSTR lpDevicePath)<br />
{<br />
    TCHAR d = _T('A');<br />
    while(d < = _T('Z'))<br />
    {<br />
        TCHAR szDeviceName[3] = {d,_T(':'),_T('\0')};<br />
        TCHAR szTarget[512] = {0};<br />
        if(QueryDosDevice(szDeviceName, szTarget, 511) != 0)<br />
            if(_tcscmp(lpDevicePath, szTarget) == 0)<br />
                return d;<br />
        d++;<br />
    }<br />
    return NULL;<br />
}<br />

scrolling text

locoone1-Jul-06 22:04

locoone

1-Jul-06 22:04

im trying to make a scrolling text im using scrollwindow and it moves back and forth but when it goes from left to right if the text is say "hello" it looks like hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhello how can i get it to look right and not repeat the first letter?

Re: scrolling text

ovidiucucu2-Jul-06 2:25

ovidiucucu

2-Jul-06 2:25

To avoid such nasty hhhhhhhhhhhhhhhhhhhhheadaches, you can take a look at THIS FAQ[^]

Ovidiu Cucu
Microsoft MVP - Visual C++

Why can't this code translate VK_UP into VK_SHIFT+VK_TAB

zouchao11121-Jul-06 21:55

zouchao1112

1-Jul-06 21:55

CMyDialog::PreTranslateMessage()
{
if(pMsg->message == WM_KEYDOWN)
{
if(pMsg->wParam == VK_UP)
{
m_bUp = TRUE;
pMsg->wParam = VK_TAB;//tranlate into TAB
keybd_event(VK_SHIFT, 0, 0, 0); //press down the shift
}
else if(pMsg->wParam == VK_DOWN)
{
m_bUp = FALSE;
pMsg->wParam = VK_TAB;//tranlate into TAB
}
else
m_bUp = FALSE;
if(IsDialogMessage(pMsg))
return TRUE;
}
else if(m_bUp)
{
keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP, 0);//Release SHIFT
m_bUp = FALSE;
}
return CDialog::PreTranslateMessage(pMsg);
}

Existing File [modified]

Moujan1-Jul-06 19:58

Moujan

1-Jul-06 19:58

Could someone tell me what open mode I can use to write data only to the end of my already created (existing) file? should I use iso::trunc?

~Moujan

-- modified at 1:59 Sunday 2nd July, 2006

Re: Existing File

Taka Muraoka1-Jul-06 20:07

Taka Muraoka

1-Jul-06 20:07

ios::app

0 bottles of beer on the wall, 0 bottles of beer, you take 1 down, pass it around, 4294967295 bottles of beer on the wall.

Awasu 2.2.2 [^]: A free RSS/Atom feed reader with support for Code Project.

Re: Existing File

Moujan1-Jul-06 20:35

Moujan

1-Jul-06 20:35

Thanks Taka,

Moujan

duplicate definitions

Moujan1-Jul-06 17:17

Moujan

1-Jul-06 17:17

Could some one tell me how I can prevent duplicate definitions in my program. I mean should I use something like #definemyClass or should I use provate keyword.

Thanks, Moujan

Re: duplicate definitions

Steve Echols1-Jul-06 18:03

Steve Echols

1-Jul-06 18:03

Typically in your .h header file you would put:

#ifndef _MY_CLASS_H
#define _MY_CLASS_H

class MyClass
{
...
};

#endif // _MY_CLASS_H

- S
50 cups of coffee and you know it's on!

Re: duplicate definitions

Moujan1-Jul-06 18:22

Moujan

1-Jul-06 18:22

Thanks for replay.

Moujan

System Wide hook for file save as dialog in All applications

Mo12341-Jul-06 6:46

Mo1234

1-Jul-06 6:46

Hi,
I am looking for System Wide hook for File Save as dialog.

What I want is to show more data inputs to enter in the dialog such as : a dropdown with some values, a date control etc.

It is not necessary it be the same dialog, it could be a new dialog all together with customized UI (preferrable) and gets some of the dropdown values from a database.

Creating the UI controls / Getting the information from database will not be issue at all.

What I am specifically looking for is how to make file save as hook, how to show a modified OR a new dialog all together (preferable) in all Apps when file save / file save as is executed ?

Have already seen the articles on System Wide hooks. They are very good but I am looking on how to do this specific application scenerio.

I will really appreciate your suggestions.

Thanks

Mo

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