C / C++ / MFC

how to drawline on picture box in MFC/C++?

10-Feb-09 12:20

If there's a command line way of doing it, can't you have a peek at the source of the comamnd that does it?

If the IP is of a local network adaptor, you can probably use an ioctl on the socket to get the MAC address (see this bit of code[^]).

If it's remote, then you either need to decode a packet coming back from the remote address (it ill contain the MAC address in the ethernet part of the packet) or search through the ARP cache...

From what I can see, this book[^] is the definitive source for this stuff. It's on Safari and looks to have everything you'd want.

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

ping_jacob10-Feb-09 7:44

ping_jacob

10-Feb-09 7:44

i need to drawline on picture box in MFC/C++

how can do it?

please give some tip or hint to me

thanks so much....

Re: how to drawline on picture box in MFC/C++?

Stuart Dootson10-Feb-09 8:06

Converting Byte array to Varinat and Variant to Byte array

10-Feb-09 8:06

Override CStatic to give you an MFC class that subclasses the picture box.
Add an OnPaint handler to that new class.
In the OnPaint handler, get a DC with BeginPaint
Use MoveTo[^] and LineTo[^] to draw a line
Add a class variable (of the type you created in step 1) for the picture box in your parent window

drawline on picture box - DONE!

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

Elsie10-Feb-09 7:23

Elsie

10-Feb-09 7:23

Can you pls help me with the sample code of converting Byte array to variant and vice versa

Thanks

Re: Converting Byte array to Varinat and Variant to Byte array

Stuart Dootson10-Feb-09 8:13

Re: Converting Byte array to Varinat and Variant to Byte array

10-Feb-09 8:13

Create a SAFEARRAY[^] of VT_UI1 (a VT_UI1 is equivalent to a BYTE) and encapsulate it in a VARIANT[^] with a type of VT_UI1|VT_ARRAY.

There's a sample of that in this page[^]. Search for VT_UI1 in that page to find the code!

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

Elsie10-Feb-09 16:33

Elsie

10-Feb-09 16:33

Thanks a lot, it was very helpful

Customized toolbars (dynamically add/remove buttons to toolbars) in MFC ?

Maximilien10-Feb-09 7:15

Maximilien

10-Feb-09 7:15

We are looking to add customized toolbars (and commands) to our application.

We do not necessarily need something as extensive as what is done in Visual Studio (or MS Word).

Are there easy solutions to have those kind of features in a MFC application ?

I know there's a basic support in MFC (CToolBarCtrl::Customize) but from what I see when trying to use it is that
it does not really work well.

Thanks
Max

This signature was proudly tested on animals.

WindowLess Rich Text

ForNow10-Feb-09 7:10

ForNow

10-Feb-09 7:10

Hi,

I did a lot of Work With Device Contexts and thought I would have to abondon that knoweledge when I used Rich edit

Then I came across ITextServices Which has a Object ITextHost with TxGetDC member

The problem ???

The Code I wrote to implement Rich Edit was in C

Is there some paragma that I can use to have piece of code compiled as C++

Or do I have re-compile the whole program as a .cpp extension to use the ITextHost Interface ??

thankx

Re: WindowLess Rich Text

Stuart Dootson10-Feb-09 8:00

Redrawing lines draw by a user

10-Feb-09 8:00

Tell the compiler to compile as C++, either using project properties (for a Visual Studio project) or with the /TP option (on the command line) - that is what altering the VS project option adds in.

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

Re: WindowLess Rich Text

ForNow10-Feb-09 13:21

ForNow

10-Feb-09 13:21

I have project properties to compile as C++

I got the following compile errors including textserv.h

dont know if its becuase I have a .c extension

thankx again

Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(152) : error C2061: syntax error : identifier 'ITextServices'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(152) : error C2059: syntax error : ';'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(152) : error C2059: syntax error : ':'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(271) : error C2061: syntax error : identifier 'ITextHost'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(271) : error C2059: syntax error : ';'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(271) : error C2059: syntax error : ':'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(411) : error C2143: syntax error : missing ')' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(411) : error C2143: syntax error : missing '{' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(412) : error C2143: syntax error : missing ';' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(413) : error C2143: syntax error : missing ';' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(413) : error C2059: syntax error : ')'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(416) : error C2143: syntax error : missing ')' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(416) : error C2143: syntax error : missing '{' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(417) : error C2143: syntax error : missing ';' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(418) : error C2143: syntax error : missing ';' before '*'
1>C:\Program Files\Microsoft Visual Studio 8\VC\PlatformSDK\Include\textserv.h(418) : error C2059: syntax error : ')'
1>.\HERCCMD.C(562) : error C2065: 'ITextServices' : undeclared identifier

Re: WindowLess Rich Text

ForNow10-Feb-09 13:54

ForNow

10-Feb-09 13:54

Sorry about that .....

I got other compile errors but I think I am invoking the C++ compiler

en9ap10-Feb-09 6:27

en9ap

10-Feb-09 6:27

Hello,

First off, If this question has been answered could you direct me to the correct place. I've carried out a search but had little luck.

I've got a basic drawing program written in C++(Win32 API) which allows me to draw rectangles (using GDI functions) on the screen. I click two points on the window and a rectangle appears. When I minimize the window and restore it again, as expected the rectangle is gone.

Is there a neat solution which keeps the rectangle on screen? The only why I can see is to save the data points and call them when a WM_PAINT message is requested. To me, this method seems like it can get pretty messy, but then again I am a newbie to programming.

Thanks in advance

Stuart Dootson10-Feb-09 6:54

10-Feb-09 6:54

en9ap wrote:
The only why I can see is to save the data points and call them when a WM_PAINT message is requested. To me, this method seems like it can get pretty messy

The other way you could do it is to draw onto a bitmap and use the bitmap as backing store for the window. You would then BitBlt the bitmap onto the window in the window's OnPaint handler.

CMemDC[^] would be useful, if you have VS2008. Otherwise, this CP article[^] could be useful.

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

led mike10-Feb-09 6:54

led mike

10-Feb-09 6:54

en9ap wrote:
The only why I can see is to save the data points and call them when a WM_PAINT

It's not the only way but teh Scribble[^] Sample project that has been around for like a decade used to do that. I don't know what the current versions do.

Cedric Moonen10-Feb-09 7:59

Cedric Moonen

10-Feb-09 7:59

en9ap wrote:
To me, this method seems like it can get pretty messy

Why should it be pretty messy ? The other way around would be pretty messy because it means there's no real way 'remove' some parts of your drawing. Suppose that your user wants to remove one of the rectangle he drawn. If everything stayed visible on the screen, then it would mean that you have no way to remove only one rectangle, unless you kept all the rectangle coordinates in memory and draw everything again except this specific rectangle. But then, you end up with something similar as what you have with the WM_PAINT message.

Storing your rectangle coordinates in memory also help making your view indepedant from your data (your 'model'). Suppose that you want to incorporate a zoom functionality in your view, if your data is separated from your view, it is extremly easy to do. It wouldn't be easy at all if your rectangle was still on the screen.

en9ap wrote:
Is there a neat solution which keeps the rectangle on screen?

To answer your question, if there was a solution to do this, it wouldn't be neat for the reasons explained earlier.
In fact, what you have to do is capture the mouse movement and once you have to draw your rectangle, do not draw it immediately. Instead store the coordinates and ask a refresh from your view (invalidate your view). This way, a WM_PAINT message will be sent and you can redraw your view.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Toggling highlighting through a CListCtrl in the correct order

en9ap11-Feb-09 4:39

en9ap

11-Feb-09 4:39

Thank you all for your replies. I shall look into saving the data points. Indecently, is this how vector drawing packages such as Corel Draw operate?

Sternocera10-Feb-09 6:01

Sternocera

10-Feb-09 6:01

Hi guys.

My MFC application uses a CListCtrl with the icon style. The List Ctrl handles messages that make it select/highlight the first, previous, next and last icon, for navigation purposes. However, the order that selection toggles is wrong (it's consistent though) - It is as if the CListCtrl has a different conception of their actual order. I can toggle through the icons 1st, 4th, 2nd, 3rd. I can press "First", send a message, and get to the 1st. I can press last, and get to the third. I can toggle back and forth in that consistent, incorrect order.

What might I be doing wrong? Any suggestions as to how I might solve this problem are greatly appreciated.

Here is the relevant code:

void CMyView::OnInitialUpdate()
{
	.....
	MyListCtrl.ModifyStyle(0, LVS_AUTOARRANGE);
	MyListCtrl.SetImageList(&imgl, 0);
	LVITEM lvi0;
	lvi0.mask =  LVIF_IMAGE | LVIF_TEXT;
	lvi0.iSubItem = 0;
	lvi0.pszText = "First Icon";
	lvi0.iImage = 0;


	int first_icon = MyListCtrl.InsertItem(&lvi0);
	MyListCtrl.SetItemData(first_icon, 1);
	....
}
LRESULT CMyView::OnPressedFirst(WPARAM, LPARAM lParam)
{
	ClearSelection();
	MyListCtrl.SetItemState(0, LVIS_SELECTED | LVIS_FOCUSED, LVIS_SELECTED | LVIS_FOCUSED);
	return 0;
}
LRESULT CMyView::OnPressedPrevious(WPARAM, LPARAM lParam)
{
	
	MyListCtrl.SetFocus();
	int i = MyListCtrl.GetItemCount();
	int j = 0;
	for(; j != i; ++j)
	{
		UINT uState = MyListCtrl.GetItemState(j, LVIS_SELECTED | LVIS_FOCUSED);
		if (uState & LVIS_SELECTED)
			break;
	}
	if(j == i)
	{
		MyListCtrl.SetItemState(0,LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
		return 0;
	}
	--j; // it's the previous one
	if( j < 0)
	{
		MyListCtrl.SetItemState(0,LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
		return 0;
	}
	ClearSelection();
	MyListCtrl.SetItemState(j,LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
	return 0;
}
LRESULT CMyView::OnPressedNext(WPARAM, LPARAM lParam)
{
	MyListCtrl.SetFocus();
	int i = MyListCtrl.GetItemCount();
	int j = 0;
	for(; j != i; ++j)
	{
		UINT uState = MyListCtrl.GetItemState(j, LVIS_SELECTED | LVIS_FOCUSED);
		if (uState & LVIS_SELECTED)
			break;
	}
	if(j == i)
	{
		MyListCtrl.SetItemState(0,LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
		return 0;
	}
	++j; // it's the next one
	if( j >= i)
	{
		return 0;
	}
	ClearSelection();
	MyListCtrl.SetItemState(j,LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
	return 0;

}
LRESULT CMyView::OnPressedLast(WPARAM, LPARAM lParam)
{
	ClearSelection();
	MyListCtrl.SetFocus();
	int i = MyListCtrl.GetItemCount();
	--i;
	MyListCtrl.SetItemState(i, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING, LVIS_SELECTED | LVIS_FOCUSED | LVIS_ACTIVATING);
	return 0;
}

Regards,
Sternocera

How can i modify my picture control to automatically draw line?

z01e10-Feb-09 5:50

z01e

10-Feb-09 5:50

I've got a class that handle picture control to load image. (ex. m_pic1.SetBitmap("pic.bmp")) '

and i know how to draw line if i put these dcMem.MoveTo(x1,y1) & dcMem.LineTo(x2,y2) into this

(These code are quote from class that that handle picture control)

void CPictureBox::ShowBitmap(CPaintDC *pdc)<br />
 {<br />
  CDC dcMem;<br />
  dcMem.CreateCompatibleDC(pdc);<br />
  CRect lRect;<br />
  GetClientRect(lRect);<br />
  lRect.NormalizeRect();<br />
  CBitmap* pOldBitmap = (CBitmap*)dcMem.SelectObject(&m_bmpBitmap);<br />
  //put it here<br />
  pdc->StretchBlt(0,0,lRect.Width(),lRect.Height(),&dcMem,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);<br />
 }

and i got a struct that contain a coordinate like this

struct coord
{
int beginx;
int beginy;
int endx;
int endy;
};

Could you please help me find the way to modify this class to automatically draw lines likes

ex. m_pic1.SetBitmap("pic.bmp",coord)

Thank you for your help.

p.s. I'm a newbie to these codes. It would be pleased if you gave me some example with your answer. Thank you.

Back to basics; just started learnin C++

EliottA10-Feb-09 5:46

EliottA

10-Feb-09 5:46

Hello, been using C# and vb.net and decided it's about time to make the leap to C++. I got a book recommended to me by a co worker entitled "Simple C++; learn C++ while you build the Incredible Robodog using POOP - The profound Object-Oriented Programming method" by Jeffrey M. Cogswell. I'm fine with this before I go onto something a little more detailed, and I have some pretty basic questions that a book written a decade ago just can't tackle.

Firstly, a compiler. Which one do I use, I prefer something integrated with an IDE. Now I know VS has VC++, is this compiler only for C++.Net (which is managed I know, and I want to stay away from managed code for a bit).

Recommendations, anything welcome.

Check out the CodeProject forum Guidelines[^]

prasad_som10-Feb-09 6:39

prasad_som

10-Feb-09 6:39

EliottA wrote:
is this compiler only for C++.Net

It can be used for unmanaged(only) code as well.

Eytukan10-Feb-09 7:24

Eytukan

10-Feb-09 7:24

Check here[^]

Choose "win32" in the "project type" window then select "win32 Console application". Though you can still control the exe type through project settings. It's native by default. If you want to completely get out of dotnet environment, choose vc6.0 compiler that comes with Visual Studio 6.0 but the environment sucks. Intellisense fails too often. and less colorful Wink | ;)

OK,. what country just started work for the day ? The ASP.NET forum is flooded with retarded questions. -Christian Graus

Best wishes to Rexx[^]

EliottA10-Feb-09 7:32

EliottA

10-Feb-09 7:32

The reason I ask is because I tried that, and the project came with some headers and I removed them all and created the typical first program

#Include <iostream.h>

void main
{
cout << "Hello, world";
}

And It wouldn't compile citing "Error 1 fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source? c:\documents and settings\elaintabi\my documents\visual studio 2008\projects\helloworld\helloworld\helloworld.cpp 7 helloWorld"

because I removed stdafx.h and the include, why do I need this file if in my book it doesn't include it in its sample?

Check out the CodeProject forum Guidelines[^]

toxcct10-Feb-09 7:51

toxcct

10-Feb-09 7:51

this is because you might have started a project from a template or something.

just deactivate the precompiled headers in the compiler settings to have this error disappeard.

BTW, be careful. #include is with a small i, not #Include.
Moreover, you should prefer using iostream (without .h) header.

also, you code won't work for some other reasons.

cout won't be found in the global namespace. just prepend it with std::.

and main is a function, so you have to give it a pair or parenthesis:

#include <iostream>
 
void main() {
    std::cout << "Hello World !";
}

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