C / C++ / MFC Discussion Boards

Re: getting a pointer to a child view (cwnd)

Christian Graus16-Jan-02 16:44

16-Jan-02 16:44

How are you doing this ? Are you trying to call OnPaint, or are you invalidating the window ?

To force OnPaint you should do this

tmp->Invalidate();

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: getting a pointer to a child view (cwnd)

16-Jan-02 16:46

ah, well invalidate seemed to work fine since I just needed the window to update every second.

But for future reference, do you know how I would go about accessing a function of my CChildView class from CMainFrame?

Re: getting a pointer to a child view (cwnd)

Christian Graus16-Jan-02 17:06

Christian Graus

16-Jan-02 17:06

GetActiveView ?

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: getting a pointer to a child view (cwnd)

Nish Nishant16-Jan-02 20:28

Nish Nishant

16-Jan-02 20:28

Anti_dentite wrote:
but this appears to be a pointer to only CWnd, not my CChildView class

You need to cast the CWnd* to a CChildView*

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut

Re: getting a pointer to a child view (cwnd)

16-Jan-02 22:41

What about sending a WM_PAINT?
I think it calls OnPaint for you (or did I confuse sth.?)

mfg HintiFlo

Re: getting a pointer to a child view (cwnd)

Christian Graus17-Jan-02 0:23

Christian Graus

17-Jan-02 0:23

You shouldn't call WM_PAINT, you should let the system handle it through a call to Invalidate() or RedrawWindow().

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

SetActiveWindow / Win2K

sankar16-Jan-02 14:46

sankar

16-Jan-02 14:46

Hi All
I have an application "A" which is active and there's an application "B" getting activated behind the application "A". ( A's window is not the parent of B ) . In WinNT, I'm able to bring the application B's window to the foreground. But, In Win2K Professional, the API - SetActiveWindow / SetForeGroundWindow doesn't seem to work. Is there any otehr round about way to fix this, Pl. sugegst me.

Thanks
regards
Sankar

Re: SetActiveWindow / Win2K

Nish Nishant16-Jan-02 16:12

Nish Nishant

16-Jan-02 16:12

On Win2K there is a registry setting which can be used to set it so that apps will be prevented from being made active [even though their task bar icons will start flashing]

This is a per-user setting that works only on Win2K as far as I know. I dont remember the registry key, but you can use TweakUI to set or unset this setting

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut

Convert exe to dll

arsen3d16-Jan-02 14:45

arsen3d

16-Jan-02 14:45

How do you modify a VC++ Project to build a dll instead of an exe? Are there articles out there on this?

Re: Convert exe to dll

Nish Nishant16-Jan-02 16:13

Nish Nishant

16-Jan-02 16:13

I'd advise you to create a fresh DLL project and copy/paste the various functions and classes.

Nish

Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut

Re: Convert exe to dll

16-Jan-02 22:44

OOOOOOHNO!!!!
Copy and paste should be a nono since Object-Orientation!;)

Re: Convert exe to dll

C^hris L^osinger17-Jan-02 7:27

C^hris L^osinger

17-Jan-02 7:27

it's probably easiest to just create a new DLL project then copy the files from the EXE project to the DLL project.

-c

Smaller Animals Software, Inc.

Terminal Type Window????

Tryhard16-Jan-02 13:40

Tryhard

16-Jan-02 13:40

Hi all,

I am fairly new to VC++ and am looking for some advice before I start a new program.

I want to write a program that looks like a terminal session.

i.e. one window - it will present a prompt i.e. # and flashing cursor you then type your command and press enter. The results then appear on the next line followed by a new prompt and flashing cursor on the next line. (I think you get what I am after)

I have played with using edit box, rich edit box and list box all seem to be able to acheive this sort of program one way or another, but which one should I really be using??

All advice greatly appreciated,
Thanks all,

Tryhard Smile | :)

Re: Terminal Type Window????

Mustafa Demirhan16-Jan-02 13:57

Mustafa Demirhan

16-Jan-02 13:57

Tryhard wrote:
I have played with using edit box, rich edit box and list box all seem to be able to acheive this sort of program one way or another, but which one should I really be using??

Nope! You can not show a flashing cursor on the list box. Using editbox will be simpler than using a richedit. But using rich edit allows you to do more complex operations, such as changing font, color, ...etc.

Kind regards
Mustafa Demirhan

http://www.macroangel.com

Sonork ID 100.9935:zoltrix

Re: Terminal Type Window????

Fredrik Skog16-Jan-02 21:23

Fredrik Skog

16-Jan-02 21:23

Check out the VCTERM sample in MSDN.
I am currently writing a terminal app, and I have chosen the edit box since it seems to be the easiest control to play with.
You will need to derive your own edit box class to be able to do what you want, but that is shown in the sample.

Cheers,

/Fredrik

Sonork ID: 100.11430:PhatBoy

BitBlt()

The_Server16-Jan-02 11:45

The_Server

16-Jan-02 11:45

Hi, All!!!
=======

Does anyone now how the BitBlt() function works exactly ?
and what do I need to know about SRCCOPY and SRCPAINT and stuff ?

Please help.

Thanks.

BTW: come to #CodeProject on DalNet (mIRC)

Re: BitBlt()

Christian Graus16-Jan-02 11:54

Christian Graus

16-Jan-02 11:54

Sagiv wrote:
Does anyone now how the BitBlt() function works exactly ?

What do you mean by 'exactly' ??? If you're doing a SRCCOPY I guess it essentially does a memcpy.

Sagiv wrote:
and what do I need to know about SRCCOPY and SRCPAINT and stuff ?

Here's a list from MSDN

BLACKNESS Turns all output black.

DSTINVERT Inverts the destination bitmap.

MERGECOPY Combines the pattern and the source bitmap using the Boolean AND operator.

MERGEPAINT Combines the inverted source bitmap with the destination bitmap using the Boolean OR operator.

NOTSRCCOPY Copies the inverted source bitmap to the destination.

NOTSRCERASE Inverts the result of combining the destination and source bitmaps using the Boolean OR operator.

PATCOPY Copies the pattern to the destination bitmap.

PATINVERT Combines the destination bitmap with the pattern using the Boolean XOR operator.

PATPAINT Combines the inverted source bitmap with the pattern using the Boolean OR operator. Combines the result of this operation with the destination bitmap using the Boolean OR operator.

SRCAND Combines pixels of the destination and source bitmaps using the Boolean AND operator.

SRCCOPY Copies the source bitmap to the destination bitmap.

SRCERASE Inverts the desination bitmap and combines the result with the source bitmap using the Boolean AND operator.

SRCINVERT Combines pixels of the destination and source bitmaps using the Boolean XOR operator.

SRCPAINT Combines pixels of the destination and source bitmaps using the Boolean OR operator.

WHITENESS Turns all output white.

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: BitBlt()

The_Server16-Jan-02 12:32

The_Server

16-Jan-02 12:32

Sorry...

Let me explain: . . .

Why Doesn't it work:

<code>void</code> OnPaint( <code>HWND </code>hWnd )
{
	<code>PAINTSTRUCT </code>ps;

	<code>HWND</code> hwndDesktop= ::GetDesktopWindow();

	<code>HDC</code> hdcDesktop= ::GetWindowDC(hwndDesktop);
	<code>HDC</code> hdcThis= ::BeginPaint( hWnd, &ps);

	<code>HDC</code> hdcMem= ::CreateCompatibleDC(hdcThis);

	::BitBlt(<code>hdcMem</code>, ps.rcPaint.left, ps.rcPaint.top,
		ps.rcPaint.right- ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top,
		<code>hdcDesktop</code>, ps.rcPaint.right- ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top,
		<code>SRCCOPY</code>);

	::BitBlt(<code>hdcThis</code>, ps.rcPaint.left, ps.rcPaint.top,
		ps.rcPaint.right- ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top,
		<code>hdcMem</code>, ps.rcPaint.right- ps.rcPaint.left, ps.rcPaint.bottom - ps.rcPaint.top,
		<code>SRCCOPY</code>);

	::EndPaint( hWnd, &ps);
}

BTW: come to #CodeProject on DalNet (mIRC)

Re: BitBlt()

Christian Graus16-Jan-02 12:35

Christian Graus

16-Jan-02 12:35

hdcMem contains a 1x1x1 bitmap, for starters. You need to select a bitmap into it.

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

Re: BitBlt()

The_Server16-Jan-02 13:17

The_Server

16-Jan-02 13:17

Well.. . .

I tried this

void OnPaint( HWND hWnd )
{
	PAINTSTRUCT ps;
 
	HWND hwndDesktop= ::GetDesktopWindow();
 
	HDC hdcDesktop= ::GetWindowDC(hwndDesktop);
	HDC hdcThis= ::BeginPaint( hWnd, &ps);
 <code>
	int nWidth= ps.rcPaint.right- ps.rcPaint.left;
	int nHeight= ps.rcPaint.bottom - ps.rcPaint.top;
 </code>
	HDC hdcMem= ::CreateCompatibleDC(hdcThis);
<code>	HBITMAP hbmpMem= ::CreateCompatibleBitmap(hdcMem, nWidth, nHeight);
	HBITMAP hbmpMemOld= (HBITMAP)::SelectObject(hdcMem, hbmpMem);
 </code>
	::BitBlt(hdcMem, ps.rcPaint.left, ps.rcPaint.top,
		nWidth, nHeight, hdcDesktop, nWidth, nHeight, SRCCOPY);
 
	::BitBlt(hdcThis, ps.rcPaint.left, ps.rcPaint.top,
		nWidth, nHeight, hdcMem, nWidth, nHeight, SRCCOPY);
 
<code>	DeleteObject(::SelectObject(hdcMem, hbmpMemOld));</code>
 
	::EndPaint( hWnd, &ps);
 
<code>	::DeleteDC(hdcMem);
	::DeleteDC(hdcDesktop);
</code>}

BTW: come to #CodeProject on DalNet (mIRC)

Re: BitBlt()

Christian Graus16-Jan-02 13:25

Christian Graus

16-Jan-02 13:25

::BitBlt(hdcMem, ps.rcPaint.left, ps.rcPaint.top, nWidth, nHeight, hdcDesktop, nWidth, nHeight, SRCCOPY);

You need to go from 0, 0 to nWidth nHeight, because that's the size of the bitmap. I assume you WANT to start your BitBlt from nWidth/nHeight, although obviously your window needs to be less than half the width and height of the desktop for this to work.

However, the SECOND BitBlt certainly needs to start copying from hdcMem at 0, 0 - as it stands you're starting at the point just beyond where the bitmaps exists. GDI will accept commands that are outside the bounds of the bitmap in the HDC, it will simply ignore or crop if they are partly on/partly off.

Christian

I have come to clean zee pooollll. - Michael Martin Dec 30, 2001

Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now

bind() error

Rickard Andersson²⁰16-Jan-02 11:11

Rickard Andersson²⁰

16-Jan-02 11:11

I'm trying to edit the code in one of the articles here on CodeProject. It's the article that shows how to write Client/Server apps to remote a computer. But when trying to connect to the server (the app) on the server in our network (the computer) it doesn't looks like it (teh server app) can't find the IP. Well here is the code that perhaps is the code that assigns the IP of the current computer:

<br>  local.sin_addr.s_addr = htonl(INADDR_ANY);
	local.sin_family = AF_INET;
	local.sin_port = htons(DEFAULT_PORT);<br>

And I don't know what INADDR_ANY do, is it the local IP? It should be!?
But on the server (the server computer) in our LAN seems to not retreve the IP (No firewall is installed, only All_Aboard) and then I tried this but it gives me an error when calling bind():

<br>  local.sin_addr.s_addr = inet_addr("192.168.244.129");	local.sin_family = AF_INET;
	local.sin_port = htons(DEFAULT_PORT);<br>

The error code is:
WSAEADDRNOTAVAIL
(10049)
Cannot assign requested address.
The requested address is not valid in its context. This normally results from an attempt to bind to an address that is not valid for the local machine. This can also result from connect, sendto, WSAConnect, WSAJoinLeaf, or WSASendTo when the remote address or port is not valid for a remote machine (for example, address or port 0).
(From MSDN Library)

CAN YOU HELP ME!!!!!!!

------------------------------
©0d3 ©®4©k3® - That's me! Smile | :)

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

Re: bind() error

Joaquín M López Muñoz16-Jan-02 11:37

Joaquín M López Muñoz

16-Jan-02 11:37

First, I strongly recommend you the excellent Warren Young's Winsock Programmer's FAQ.

Now for your problem. Typically, the server binds to INADDR_ANY (which means whatever IPs the local machine is assigned to) and the client connects to the IP of the server. I'm afraid I don't quite understand your explanation, so I cannot say much more than this. Also, be careful not to choose any value for DEFAULT_PORT that could be already in use (best choose something greater than 1024).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: bind() error

Rickard Andersson²⁰16-Jan-02 21:11

Rickard Andersson²⁰

16-Jan-02 21:11

DEFAULT_PORT = 5150
But I tried 4629, but I think it was the same error.

I try to explain again:

When you now explained the INADDR_ANY constant, I think the computer (the server in LAN) doesn't leave the right IP to INADDR_ANY, because when I use a code here from CP I can see currently TCP connections to the computer and then I can see the app server's connection with Local IP 0.0.0.0 and some other IP 0.0.0.0...
So, why I tried to assign the right IP direcly to the varible ( but the ip in the code example isn't the right IP! Smile | :)

to be sure it listen on the right server ip.

I'll go see the faq now... thanks if you can help me!

------------------------------
©0d3 ©®4©k3® - That's me! Smile | :)

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

Re: bind() error

Joaquín M López Muñoz16-Jan-02 21:29

Joaquín M López Muñoz

16-Jan-02 21:29

INADDR_ANY is actually 0.0.0.0, so don't expect to find there the IP of your local machine. What happens is that Winsock treats 0.0.0.0 in a special way, meaning "all of the IPs currently assigned to the local machine". I say "all if the IPs" because a machine can have more than one IP: for instance, if it is conencted to a LAN and also to the Internet via a modem. So, a server bound to INADDR_ANY is prepared to listen to any connect incoming request from any network the local machine is connected to. Hope this helped to clear things up a little.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

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