C / C++ / MFC Discussion Boards

alex.barylski25-Oct-02 12:33

25-Oct-02 12:33

If i do the folowing:

class CMyListBox : public CListBox
{
  DrawItem(LPDRAWITEMSTRUCT lpDIS){ }
  MeasureItem(LPMEASUREITEMSTRUCT lpMIS){}
};

I can use the ownerdraw mechanism to create the display and keep the drawing code encapsulated inside the CMyListBox object. However if I want to do thie in SDK i'm screwed...cuz WS_OWNERDRAW must be handled by the controls parent window procedure...

Is there any way I can get around this...?

I guess I could handle the parent WM_DRAWITEM and just re-direct the message back to the control...but this doesn't seem very elegant...

Suggestions...???

Thanx! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: SDK vs MFC ownerdraw

Ravi Bhavnani25-Oct-02 12:46

Ravi Bhavnani

25-Oct-02 12:46

Use message reflection[^].

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: SDK vs MFC ownerdraw

alex.barylski25-Oct-02 13:08

alex.barylski

25-Oct-02 13:08

Thanx Ravi!

I'll look into forsure...however I thought reflection was a MFC mechanism...?

Cheers! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: SDK vs MFC ownerdraw

Ravi Bhavnani26-Oct-02 4:55

Ravi Bhavnani

26-Oct-02 4:55

Yes it is - sorry I replied in a hurry! Blush | :O

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Need Help(CDC)

Svin25-Oct-02 10:49

Svin

25-Oct-02 10:49

Sorry for my English , it is not my own English.

I write a program which draw and move a triangels. When i move i must a redraw area. I use double buffering. I use MDI.

OnDraw(CDC *pDC)
{
CClientDC lpDC(this);
lpPen = new CPen(PS_SOLID,1,RGB(0,0,0));
lpDC.SelectObject(lpPen);
CDC MemDC;
CBitmap MemBitmap;
MemDC.CreateCompatibleDC(pDC);
MemBitmap.CreateCompatibleBitmap(pDC,rWinRect.right,rWinRect.bottom);
CBitmap *pOldBitmap = MemDC.SelectObject(&MemBitmap);

// Draw all
lpDC.BitBlt (0,0,rWinRect.right,rWinRect.bottom,&MemDC,0,0,SRCCOPY);
MemDC.SelectObject(pOldBitmap);
}

And then i move a triangel i use for example
OnMouseMove(..)
{

// Do something
CClientDC lpDC(this);
OnDraw(&lpDC);
}

BUT AFTER A SEVERAL TIME PROGRAM CRASH WITH MESSAGE:
" A require resource was unavaliable"

PLEAZE HELP. Confused | :confused:

Re: Need Help(CDC)

includeh1025-Oct-02 21:15

includeh10

25-Oct-02 21:15

u need release ur dc;

code should be:
1. create a function:
DrawDC(CDC*pDC)
{
//put memory dc etc here
//do not use CClientDC lpDC(this);
//use pDC directly
}

2. OnMouseMove()
{
CDC pDC=GetDC();
DrawDC(pDC);
ReleaseDC(pDC);
}

3.OnDraw(CDC *pDC)
{
DrawDC(pDC);
}

includeh10

Big thx

Anonymous26-Oct-02 6:21

Anonymous

26-Oct-02 6:21

Big thx

How to write a code to increment by 4

needhelp5725-Oct-02 10:43

needhelp57

25-Oct-02 10:43

I am writing a program that provides the cost depending on weight. If the item weighs less than 16 ounces, the cost is $3.00. If more than 16 ounces the cost increases by .50 for each additinal 4 ounces. Here is what I have so far. It give me the 3 (not showing current format of $3.00) for weights <=16. But >16 shows a negative number.

Can some edit my code so it'll work? URGENT

#include <iostream.h>
#include <stdlib.h>
#include<stdio.h>

int main()
{
int wgt;
int x=0;
double cost;
int n = 4;
double i = 0.50;
double y;

cout <<"Enter the weight" <<endl;
cin="">> wgt;

if (wgt <16)
cost = 3.00;

cout <<"The cost is" <<cost <<endl;
="" {
="" if
="" (wgt="">16)
wgt = wgt +x;
x= n++;
y= i++;
cost = cost +y;

cout <<"Do you want to calculate the delivery";
cout <<" cost for another package?" <

Re: How to write a code to increment by 4

C^hris L^osinger25-Oct-02 10:58

C^hris L^osinger

25-Oct-02 10:58

sounds like homework, to me

so, here's a hint: if weight > 16, find out how much greater, then multiply the difference by $.50.

-c

"[it was..] one of those evenings when you feel that not only will there definitely be a revolution, but that the Association of Manufacturers will foot the bill."
-- Umberto Eco, Foucault's Pendulum

Smaller Animals Software

Re: How to write a code to increment by 4

needhelp5728-Oct-02 7:29

needhelp57

28-Oct-02 7:29

As I see it this will only work if the cost is $.50 per amount >16. I need to figure out that amount at $.50 per increments of 4. (4 for .50, 8 for 1.00, etc.)

How can I do this? Confused | :confused:

Re: How to write a code to increment by 4

Mel Feik25-Oct-02 11:09

Mel Feik

25-Oct-02 11:09

I might be that's Friday and I'm already into the brew or else you are code adds zero to 'x' then does the x=n++ .. etc... am i missing something here(mind you.. i've only glanced at your code so far)

---------------------------------------------

The greenest grass is NOT on the other side of the fence, its the grass you take care of. Have you watered your lawn lately?

Auto-completion after . or -> doesn't work

User 665825-Oct-02 10:34

User 6658

25-Oct-02 10:34

Hi
In my current project the auto-completion suddenly does not work anymore. Usually if you type e.g.

CString foo<br />
foo.

a list of all available functions should appear, but that's not the case anymore. I already deleted the class-wizard file, but that didn't help Frown | :(

Any suggestions?

thanks in advance

modified 12-Sep-18 21:01pm.

Re: Auto-completion after . or -> doesn't work

C^hris L^osinger25-Oct-02 10:56

C^hris L^osinger

25-Oct-02 10:56

try deleting the .ncb file, too

sometimes that helps

-c

"[it was..] one of those evenings when you feel that not only will there definitely be a revolution, but that the Association of Manufacturers will foot the bill."
-- Umberto Eco, Foucault's Pendulum

Smaller Animals Software

Re: Auto-completion after . or -> doesn't work

User 665825-Oct-02 11:24

User 6658

25-Oct-02 11:24

Thanks, this was the solution Smile | :)

modified 12-Sep-18 21:01pm.

Inserting your own warnings into code

nde_plume25-Oct-02 9:35

nde_plume

25-Oct-02 9:35

I want to insert my own warnings into code, to leave a fixed
record of things I have delayed doing. For example, I have
a function that converts a block of data into ASCII text, for
storage. However, the first quick and nasty implementation does
not get very good compression performance. So I want to insert
a line in the function saying something like:

#pragma message(__FILE__ " (" __LINE__ "): warning C1234: " \
"Need to improve the compression here.")

However I cann't get it to work right (__LINE__ is a number,
and #__LINE__ doesn't seem to work in this context.)

I seem to remember something here about this, but I couldn't find
it.

Any suggestions would be most helpful.

Re: Inserting your own warnings into code

Michael Dunn25-Oct-02 14:57

Michael Dunn

25-Oct-02 14:57

The # operator only works in a macro definition, not a #pragma, so do something like:

#define MAKESTR(x) #x
#pragma message "foo" MAKESTR(__LINE__) "bar"

--Mike--
"I'd rather you just give me a fish today, because even if you teach me how to fish, I won't do it. I'm lazy." -- Nish
Just released - 1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
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Re: Inserting your own warnings into code

nde_plume5-Nov-02 8:24

nde_plume

5-Nov-02 8:24

None of the suggestions offered worked, so I asked the
same question on comp.lang.c++.moderated, and they
pointed out that you need to double expand the __LINE__
macro for some subtle reasons. Anyways, for future
readers interested in how to do it, here is what I
now use:

#define STRINGIZE(x) #x
#define EVAL_STRINGIZE(x) STRINGIZE(x)
#define WARN(warning) message(__FILE__ "("EVAL_STRINGIZE(__LINE__)"): warning C1000: " warning)

Put these macros in a general project header included
everywhere (I guess you could even put them in stdafx.h
if you are so inclined, personally, all my projects have
a file called Project.h that is the first included in every
header.)

Then whenever you want to issue a warning during compile
time just use this:

#pragma WARN("Using bubble sort here, a better algorithm is required")

which will appear on your compiler output (and task list if
using VC .Net), which you can F4 through. When you fix the
error, just remove the pragma.

Re: Inserting your own warnings into code

Anonymous25-Oct-02 19:23

Anonymous

25-Oct-02 19:23

ASSERT(0 && "I have to improve this code");

Creating a maximixed dialog

monrobot1325-Oct-02 9:24

monrobot13

25-Oct-02 9:24

I have a dialog based app that I want to start maximized but it just doesn't want to happen. I'm using the following code:

BOOL CToolTabsDlg::PreCreateWindow(CREATESTRUCT& cs) 
{
	cs.style &= WS_MAXIMIZE;
		
	return CDialog::PreCreateWindow(cs);
}

Does this not work on dialogs or am I doing something completely wrong?

Something I just tried was putting a breakpoint on the cs.style statement just to see if the value changed and my program didn't even break. Obviously I'm doing something wrong but I'm not sure what it is.

Any help would be much appreciated.

- monrobot13

Re: Creating a maximixed dialog

Ravi Bhavnani25-Oct-02 9:53

Ravi Bhavnani

25-Oct-02 9:53

Add this to your OnInitDialog():

PostMessage (WM_SYSCOMMAND, SC_MAXIMIZE);

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Creating a maximixed dialog

monrobot1325-Oct-02 12:52

monrobot13

25-Oct-02 12:52

Thanks Ravi!

Is there a reason why the PreCreateWindow function wouldn't work? I'm wondering.

- monrobot13

Re: Creating a maximixed dialog

includeh1025-Oct-02 21:47

includeh10

25-Oct-02 21:47

use ::IsWindow(m_hWnd) to see if the window is OK in PreCreateWindow()

includeh10

Re: Creating a maximixed dialog

Didaa25-Oct-02 21:32

Didaa

25-Oct-02 21:32

Don't do it in precreate window.

write the following code in OnInitDialog function

BOOL MyDialog::OnInitInstance()
{
//Some code generated by the framework

ShowWindow(SW_MAXIMIZE);
return TRUE;
}

This will work.

Re: Creating a maximixed dialog

Gary R. Wheeler26-Oct-02 3:34

Gary R. Wheeler

26-Oct-02 3:34

monrobot13 wrote:

cs.style &= WS_MAXIMIZE;

should be

cs.style |= WS_MAXIMIZE;

at the very least. "&=" removes the WS_MAXIMIZE bit.

Software Zen: delete this;

Resize Dialog Box via Code :: MFC

valikac25-Oct-02 9:21

valikac

25-Oct-02 9:21

Hi.

I would like to know is it possible and how to internally (program) resize a dialog box. For example:

---------------------
| |
|edit box |
|button |
| |
---------------------

Given a dialog box with that looks like the one above, I would like to programmably resize it.

--------------------
| |
|edit box |
|button |
| |
| |
| |
| |
--------------------

In other words, I would like to expand and contracts the dialog frame.

Thanks,
Kuphryn

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