About SDK programming - C / C++ / MFC Discussion Boards

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Re: Error LNK2001

Not Active31-Aug-01 9:32

Not Active

31-Aug-01 9:32

Check your project settings, make sure your not missing a library or header in the release settings.

ActiveX controls and BitBlt

squizz31-Aug-01 5:24

squizz

31-Aug-01 5:24

Hi,
i developped a class derived from static to represent real time data chart. To do this i used BitBlt.

I want to port this to an activeX control bun when I create an activeX with the wizard, i cannot accomplish Bit blitting.

Does someone have a solution ?

looking for clarification

Josh Knox31-Aug-01 5:21

Josh Knox

31-Aug-01 5:21

In classwizard generated code I find the following comment:

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

I don't really get it. What is the OnPaint function used for if not for painting? Is this the correct place to put my code for redrawing the window?
Do I update controls from here?

Could someone enlighten me on this?

Thanks

Josh
josh@that-guy.net

Re: looking for clarification

C^hris L^osinger31-Aug-01 6:07

C^hris L^osinger

31-Aug-01 6:07

yes, you can use it for painting. just don't call it yourself (do an Invalidate, if you want to force a redraw)

if you update controls there, your controls will be VERY busy (it gets called a lot)

-c

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

Re: looking for clarification

Josh Knox31-Aug-01 6:30

Josh Knox

31-Aug-01 6:30

I'm assuming I should delegate control updates into other message handlers. Is that a better way to do it?

Josh
josh@that-guy.net

Re: looking for clarification

Paolo Messina31-Aug-01 7:06

Paolo Messina

31-Aug-01 7:06

That line just means that you can't call the base class implementation for a WM_PAINT message, because it won't work. If you really need it, you can call it, but change CPaintDC to CClientDC in the derived class (you will lose updated region info).
I can't remember if the base implementation of OnPaint actually does something. In case it doesn't, use Default().

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

Where to download e-books about "COM"?

Maer72731-Aug-01 5:09

Maer727

31-Aug-01 5:09

Where to download e-books about "COM"?

Thanks.

Maer

About SDK programming

xuhongsheng31-Aug-01 4:27

xuhongsheng

31-Aug-01 4:27

Now I want to handle the message of WM_MOUSEWHEEL. But while I add this handler in the message processing function, the VC++ compiler tell me that
error C2065: 'WM_MOUSEWHEEL' : undeclared identifier
but the WM_MOUSEWHEEL is identified while I check in the MSDN, and no other header file is requested in the help of MSDN. Confused | :confused:

Re: About SDK programming

Gregg Carlstrom31-Aug-01 4:33

Gregg Carlstrom

31-Aug-01 4:33

WM_MOUSEWHEEL is declared in winuser.h; are you #including windows.h?

Re: About SDK programming

JerzyPeter31-Aug-01 4:40

JerzyPeter

31-Aug-01 4:40

Use this line:

#define _WIN32_WINNT 0x0500

Should work,

Jerzy

Re: About SDK programming

Anders Molin1-Sep-01 1:21

Anders Molin

1-Sep-01 1:21

Use this line:

#define _WIN32_WINNT 0x0500

Why?

The Platform SDK Doc. say that it should also work under Win9x...
With that define, the application might only wotk under Win2k.

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: About SDK programming

Anders Molin1-Sep-01 1:21

Anders Molin

1-Sep-01 1:21

You might need to install the Platform SDK.
It updates your headerfiles to newer versions...

- Anders

Money talks, but all mine ever says is "Goodbye!"

How to check out whether a file is existing?

Maer72731-Aug-01 4:26

Maer727

31-Aug-01 4:26

How to check out whether a file is existing?

Thanks.

Maer

Re: How to check out whether a file is existing?

Gregg Carlstrom31-Aug-01 4:30

Gregg Carlstrom

31-Aug-01 4:30

You'd use the FindFirstFile() Win32 API function. Assume pstrFile is a pointer to the string filename below:

WIN32_FIND_DATA findData;
HANDLE hFile = FindFirstFile(pstrFile, &findData); // Have Windows check for the file.
bool bExists = (hFile != INVALID_HANDLE_VALUE);

If the handle returned by FindFirstFile() is INVALID_HANDLE_VALUE, the file doesn't exist.

Re: How to check out whether a file is existing?

#realJSOP31-Aug-01 7:09

#realJSOP

31-Aug-01 7:09

Try this:

BOOL FileExists(CString* fn)
{
	BOOL exists = FALSE;                   // assume failure
	if (!fn.IsEmpty())
	{
		int status = _access((const char*)fn,0);
		if (status == 0)
		{
			exists = TRUE;
		}
	}
	return exists;
}

Re: How to check out whether a file is existing?

Maer72731-Aug-01 17:44

Maer727

31-Aug-01 17:44

Hi, Simmons.

Thanks for your codes pal.

Best regards.

Maer

Changing icon when program is not in focus

Mike Eriksson31-Aug-01 4:13

Mike Eriksson

31-Aug-01 4:13

Hello!

When You/I create an standard MFC application it will insert an icon for the app, the wellknown MFC icon. If I start the program then the icon will have the same background color as the 'Window banner' (if you are using the standard colors). If you change focus to an another program then the 'banner' will get 'grey' but the icon will still have the same background color (darkblue).

I see in other program, e.g. Visual Studio, that the background color of the icon changes not only when focus change but also when changing the Windows color scheme.

How do they do this??

// Anders
Confused | :confused:

Re: Changing icon when program is not in focus

Paolo Messina31-Aug-01 6:57

Paolo Messina

31-Aug-01 6:57

> How do they do this??

With trasparent background! Smile | :)

MFC Icon is not transparent at all...

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

Re: Changing icon when program is not in focus

Mike Eriksson2-Sep-01 22:07

Mike Eriksson

2-Sep-01 22:07

Don't you think that everything is easy when you know how Wink | ;-)

OK, then I need to get me an Image editor that can create transparant backgrounds

Thank you very much for the answer!

// Mike
Big Grin | :-D

Re: Changing icon when program is not in focus

Paolo Messina2-Sep-01 23:27

Paolo Messina

2-Sep-01 23:27

Yep, but you can use VC++ resource editor too! Smile | :)

To select the transparent color, click on that dark-cyan little screen icon in the color palette. The magenta one is for inverted background.

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

Re: Changing icon when program is not in focus

Mike Eriksson2-Sep-01 23:38

Mike Eriksson

2-Sep-01 23:38

I always try to learn at least one new fact a day. Now I have learned two things already! I think I need to take the afternoon off Wink | ;-)

Thanks again!

// Mike
Big Grin | :-D

File transfer using HTTP protocol :)

31-Aug-01 3:52

Hi
I am interested in transferring a File ( upload & download )
using Http Protocol. This computer is connected to the
Internet via proxy.
I am trying to use WinINet.dll. Can some one guide me, whether I am on the right course or if there are free
libraries available to do the same.
Regards,

SanskyPotov

SanskyPotov

Re: File transfer using HTTP protocol :)

Anders Molin1-Sep-01 1:25

Anders Molin

1-Sep-01 1:25

It's easy to download a file using Wininet.

I'm not so sure about upload. I guess that you could post the file to a webpage, and from that webpage you could store the RAW data that was posted, and save them to a file.
I have never tried, but it might work.

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: File transfer using HTTP protocol :)

Anders Molin1-Sep-01 1:27

Anders Molin

1-Sep-01 1:27

Woops, to answar your question...

I think that Wininet is okay for HTTP. It's easy to work with, and seems to be working just fine Smile | :)

- Anders

Money talks, but all mine ever says is "Goodbye!"

data entry question

otvac31-Aug-01 1:19

otvac

31-Aug-01 1:19

Is there a way to end a keyboard data entry with a carriage return? The CEdit control does not recognize a carriage return. You must enter the information and click some other control to process the input. The OnEditChange Message intercepts each character. I need to wait until the entry is complete, then begin processing the data.

All help appreciated.
Confused | :confused:

Richard

Last Visit: 31-Dec-99 18:00 Last Update: 8-Jul-24 13:23

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