Re: overloaded operator + - C / C++ / MFC Discussion Boards

23-Oct-01 15:36

Hi,

can you help please a newbie how to
1.maximize a view
2.set one of views to the foreground

in an MDI app. Confused | :confused:

Thanks

Pe

Re: MDI question

Christian Graus23-Oct-01 16:25

Christian Graus

23-Oct-01 16:25

1. In the view GetParentFrame()->ShowWindow(SW_SHOWMAXIMIZED);

2. I'm guessing in the view do the abvoe with SW_SHOW, or use the same technique to get a HWND to call SetWindowPos on.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: MDI question

Tomasz Sowinski24-Oct-01 0:03

Tomasz Sowinski

24-Oct-01 0:03

If by 'view' you mean MDI child frame, this is the way to go:

1) MDIMaximize

2) MDIActivate

Both methods are available from CMDIChildWnd (this is the base class for CChildFrame) and CMDIFrameWnd (the base for CMainFrame).

Tomasz Sowinski -- http://www.shooltz.com

overloaded operator +

23-Oct-01 15:30

I have this code but need to be able to concatinate the two strings passed in using the overloaded + operator function. Help.
#include "myString.h"
#include <iostream.h>
#include <string.h>

myString::myString() // default constructor
{
length = 0;
stringData = new char[1];
}

myString::myString(char *A) //conversion constructor
{
length = strlen(A);
stringData = new char[length];
for (int I=0;I<length;i++)
{
="" stringdata[i]="A[I];
" };
}

void="" mystring::show()="" shows="" the="" converted="" string
{=""
="" for="" (int="" i="0;I" <="" length;i++)
="" cout="" <<="" stringdata[i];
="" endl;
};

int="" mystring::lengthof()="" returns="" length="" of="" return="" (length);
};

mystring="" operator+(mystring="" a,mystring="" b)
{

="" (a);

}

ostream="" &operator<<(ostream="" &a,="" mystring="" &b)="" done
{
="" a="" b.stringdata="" endl;
="" a;

="" for(int="" b.length;="" i++)
="" a<<="" b.stringdata[i];
="" };
="" a;
};

istream="" &operator="">>(istream &str_in, myString & d)
{
cout << "Enter string: ";
str_in.getline(d.stringData,32000);
//cout << "Enter string 2: ";
//str_in.getline(d.stringData,32000);
//str_in.get();
return(str_in);

};

void main()
{

myString string1;
myString string2;
cin >> string1;
cin >> string2;
//cout << string1.lengthof();

cout << string1;
cout << string2;

}

Re: overloaded operator +

Michael Martin23-Oct-01 17:49

Michael Martin

23-Oct-01 17:49

What about this.

myString operator+(myString A,myString B)
{
   int nLength = strlen(A);
   nLength += strlen(B);

   char* pStr = new char[nLength+1];

   for(int nCnt = 0; nCnt++; nCnt < (strlen(A)-1))
      pStr[nCnt] = A[nCnt];

   for(nCnt = 0; nCnt++; nCnt < (strlen(B)-1))
      pStr[strlen(A)+nCnt] = B[nCnt];

   pStr[nLength] = 0; // Null terminate

   myString str(pStr);

   return (str);
}

Think it should work.

Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018

"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone

Re: overloaded operator +

Todd Smith23-Oct-01 18:36

Todd Smith

23-Oct-01 18:36

What's wrong with std::string, std::stringstream, etc. ?

Re: overloaded operator +

Christian Graus23-Oct-01 18:57

Christian Graus

23-Oct-01 18:57

Or strcat ? I suspect he's doing a homework assignment ( which is fair enough, he's had a go and posted code to ask for help, but I can't think of any other reason to write another string class. Having said that, I did it for the sake of the exercise, although I obviously use basic_string rather than my own, that was not the point. ).

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: overloaded operator +

#realJSOP24-Oct-01 2:44

#realJSOP

24-Oct-01 2:44

He may be doing what he's doing because...

a) the existing code that has to be amended but cannot be changed beyond the new code being added

b) an insane project lead refuses to think outside the box and insist that the guy use his (the project lead) classes

c) he's doing a homework assignment which requires him to write his own string class

d) he doesn't like the std::string class

Why can't you just answer the question posted instead of asking why he doesn't use this or that?

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: overloaded operator +

Todd Smith24-Oct-01 14:08

Todd Smith

24-Oct-01 14:08

The same way you answered the question?

His code doesn't even call the function he's asking for so I was somewhat confused as to what he wanted.

CCustomDraw for Trackbar

clintsinger23-Oct-01 14:17

clintsinger

23-Oct-01 14:17

Hi, I need to make my own owner drawn/custom drawn trackbar control but all the examples that I have found are geared for the listview control. I was wondering if anyone has a tutorial or an example of what to do.

Thanks,
Clint

Re: CCustomDraw for Trackbar

Tomasz Sowinski24-Oct-01 0:16

Tomasz Sowinski

24-Oct-01 0:16

Here's the example - it draws the 'channel rectangle' in green:

void CMySlider::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult) 
{
	LPNMCUSTOMDRAW pcd  = (LPNMCUSTOMDRAW)pNMHDR;
	
	if (CDDS_PREPAINT == pcd->dwDrawStage)
	{
		*pResult = CDRF_NOTIFYITEMDRAW;
		return;
	}
	
	*pResult = 0;


	if (TBCD_CHANNEL == pcd->dwItemSpec && 
		CDDS_ITEMPREPAINT == pcd->dwDrawStage)
	{
		CDC dc;
		dc.Attach(pcd->hdc);
		CRect rc;
		GetChannelRect(rc);
		dc.DrawEdge(&rc, BDR_SUNKENOUTER, BF_RECT);
		rc.DeflateRect(2, 2);
		dc.FillSolidRect(&rc, RGB(0, 255, 0));
		dc.Detach();
		
		*pResult = CDRF_SKIPDEFAULT;
	}
}

Tomasz Sowinski -- http://www.shooltz.com

HELP -- Re: CCustomDraw for Trackbar

clintsinger24-Oct-01 7:29

clintsinger

24-Oct-01 7:29

I can kind of get it to work. My control won't draw itself unless I set a breakpoint somewhere in the function and press F5 repeatedly. I am not sure if I have my message handler set up right. If anyone has a complete implementation that they could share with me so I can study it.

All help is much appreciated!

Thanks,
Clint

File Save As... and UNC File specifications

23-Oct-01 12:44

I have an MDI app that contains an open and modified document. The file specification of the document is in a UNC format (GetDocument()->GetPathName() returns \\Server\Share\MyDocument.txt). When I click on Save As, MFC calls GetSaveFileName() for me to display the CFileDialog so that I can enter a filename. When the dialog box is displayed I get four copies of the following message displayed in the debugger's output window: "First-chance exception in MyProgram.exe (RPCRT4.DLL): 0x000006BA: (no name)." If I look at the m_ofn.lpstrFile member variable that GetSaveFileName uses, the filespec is in UNC format. If I gludge things up, map a drive, and change m_ofn.lpstrFile to be a normal file spec (c:\temp\MyDocument.txt), I don't get these exceptions! In either case, the Save As appears to work just fine - the exceptions don't seem to bother things.

Does anyone with UNC experience know what is going on here? Is there something special I need to do when using UNC file specs - i.e. some flag I need to set?

Thanks,
Don Sanders

Re: File Save As... and UNC File specifications

Tomasz Sowinski23-Oct-01 23:50

Tomasz Sowinski

23-Oct-01 23:50

Does anyone with UNC experience know what is going on here?

I don't have much UNC experience, but think that you can safely ignore these messages. KB article Q105675 has more info on 'first-chance exceptions'.

Tomasz Sowinski -- http://www.shooltz.com

How can I make the computer beep w/ a few lines of code?

John Ashcroft23-Oct-01 11:12

John Ashcroft

23-Oct-01 11:12

How can I make the computer beep w/ a few lines of code?

Re: How can I make the computer beep w/ a few lines of code?

C^hris L^osinger23-Oct-01 11:18

C^hris L^osinger

23-Oct-01 11:18

::MessageBeep(MB_ICONASTERISK);

-c

Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: How can I make the computer beep w/ a few lines of code?

#realJSOP24-Oct-01 2:45

#realJSOP

24-Oct-01 2:45

::MessageBeep(0);

To hell with those thin-skinned pillow-biters. - Me, 10/03/2001

Re: How can I make the computer beep w/ a few lines of code?

Carlos Antollini23-Oct-01 11:20

Carlos Antollini

23-Oct-01 11:20

Is easy:
With the Beep function....

Carlos Antollini.
Green Alien | [Alien]

Today is Friday?
No Bob!!!

Re: How can I make the computer beep w/ a few lines of code?

Christian Graus23-Oct-01 11:20

Christian Graus

23-Oct-01 11:20

I don't know if it calls messagebeep, but beep(50,50) works fine. You can put any numbers you want, they still sound the same ;0)

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: THANKS How can I make the computer beep w/ a few lines of code?

John Ashcroft23-Oct-01 11:40

John Ashcroft

23-Oct-01 11:40

Beep(500,500);

works best on my w2K system.

Re: How can I make the computer beep w/ a few lines of code?

Ravi Bhavnani23-Oct-01 11:27

Ravi Bhavnani

23-Oct-01 11:27

According to Big Bad Bill, Beep() does the right thing on NT (and perhaps 2000), but not on Win 9x/ME.

/ravi

"There is always one more bug..."
ravib@ravib.com
http://www.ravib.com

Re: How can I make the computer beep w/ a few lines of code?

Christian Graus23-Oct-01 11:37

Christian Graus

23-Oct-01 11:37

I frequently use Beep as a sophisticated debugging tool, and I've not noticed it doing any different under W2000. Not that I was looking.

Christian

As I learn the innermost secrets of the around me, they reward me in many ways to keep quiet.

Men with pierced ears are better prepared for marriage. They've experienced pain and bought Jewellery.

Re: How can I make the computer beep w/ a few lines of code?

Carlos Antollini23-Oct-01 12:12

Carlos Antollini

23-Oct-01 12:12