C / C++ / MFC Discussion Boards

Michael Dunn31-Mar-05 11:34

31-Mar-05 11:34

You're asking for two different things there. I take "startup folder" to mean the "current directory" of the process, which doesn't have to be the same as the dir where the EXE is. If you want the current directory, call GetCurrentDirectory().

--Mike--
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Re: Program Startup Folder

Eurosid4-Apr-05 3:18

Eurosid

4-Apr-05 3:18

That works too, thanks.

Browser Helper Object (BHO)

kokain31-Mar-05 4:57

kokain

31-Mar-05 4:57

I develope a DLL that is loaded with every instance of Internet Explorer. In the DLL, I want to handle something like "BeforeNavigate" event to get the URL user enter in the Adress Bar.

I've written this DLL before in C#. And in C#, handle this event is quite easy, just write something like:

WebBrowser browser;

browser.BeforeNavigate2 += new DWebBrowserEvents2_BeforeNavigate2EventHandle(this.BeforeNavigate);

But now, I have to write it in Visual C++ 6.0. How can I handle this event in Visual C++ 6.0?

Hope to see your replies soon.
Thanks.

Re: Browser Helper Object (BHO)

Michael Dunn31-Mar-05 11:36

Michael Dunn

31-Mar-05 11:36

The answer depends on whether you're using the APIs, ATL, or MFC. I have a sample using WTL at http://www.codeproject.com/wtl/wtl4mfc6.asp[^][^] (it's not a BHO but the method for handling the events is the same).

--Mike--
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Recognizing Temp Folder in OnDropFile

rajas31-Mar-05 4:00

rajas

31-Mar-05 4:00

Hi,

I have a windows which accepts file names being dragged in (Drag AcceptFiles, OnDropFile..).
Everything works as intended when a file name is dropped from the explorer window or another window which has list of files/folders. However, when the user drags an image from a website, or an attachment from an e-mail and drops it on the Window, OnDropFile is called and a temporary folder/file name is given to the window. I need to recognize when this happens and alert the user - how can I recognize the folder as a temporary one - The location of the TEMP folder is dependent on the OS, but also seems to depend on the application - e.g. Outlook has its own temp folder, the browser uses another etc.

Thanks in advance for any help

Re: Recognizing Temp Folder in OnDropFile

Blake Miller31-Mar-05 12:06

Blake Miller

31-Mar-05 12:06

I am not sure there is ANY way to tell whatsoever, but a first good guess, assuming an application followed the proper API would be to call GetFileAttributes and check for this bit set : FILE_ATTRIBUTE_TEMPORARY

Now, granted, I have never checked for this bit, and it would be curious to see if any 'temporary' files actually have it set or not.

Re: Recognizing Temp Folder in OnDropFile

rajas31-Mar-05 17:56

rajas

31-Mar-05 17:56

Thanks.

I will try and see what I find.

CxImage problem

Lampros Giampouras31-Mar-05 3:03

Lampros Giampouras

31-Mar-05 3:03

I've downloaded and made the lib files of the CxImage library but I can't seem to make it work. I put the .lib in the object/library modules of the link tab in the general and input category but it still doesn't recognise the the CxImage object. Can anyone help me?
Should I write anything else in the code?

Re: CxImage problem

Alexander ^M.,1-Apr-05 6:16

Alexander ^M.,

1-Apr-05 6:16

Why do you ask this here? CxImage has it's own article forum for these questions.

Don't try it, just do it! Wink | ;-)

Trapping System Idle Time in MFC

Girish60131-Mar-05 2:27

Girish601

31-Mar-05 2:27

Hi Friends

I am developing an application in VC++,wherein i want that if the system remains idle for an X amount of time then some event should be generated

But for that can somebody help me in knowing how to trap System idle time IN MFC

Thanks in Advance
VC++

Re: Trapping System Idle Time in MFC

David Crow31-Mar-05 2:33

David Crow

31-Mar-05 2:33

Check out GetLastInputInfo(). There's also the idle triggers when working with scheduled tasks.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Trapping System Idle Time in MFC

Alexander ^M.,31-Mar-05 12:15

Alexander ^M.,

31-Mar-05 12:15

You could retrieve the cpu times with a timer function and check what percentage of the increment was for the idle process.

The API for NT/2k/XP is NtQuerySystemInformation.

Don't try it, just do it! Wink | ;-)

How to get a handle to a window (not my application)

Bernhard31-Mar-05 2:15

Bernhard

31-Mar-05 2:15

I have got an application, which changes the resolution of the computer(may sound like spyware etc... but it's just used internally).
The problem is that the Taskbar keeps flowing around in the middle of the screen. Is there any way to get a handle to the taskbar.
With Spy++ I found out that the WndClass is "Shell_TrayWnd". Does this help ?

As I said.. it's no adware / spyware or something I like that.. I hate those programs like we all do.

All the label says is that this stuff contains chemicals "... known to the State of California to cause cancer in rats and low-income test subjects."
Roger Wright
http://www.codeproject.com/lounge.asp?select=965687&exp=5&fr=1#xx965687xx

Re: How to get a handle to a window (not my application)

David Crow31-Mar-05 2:24

David Crow

31-Mar-05 2:24

Use FindWindow() or FindWindowEx().

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: How to get a handle to a window (not my application)

Mircea Puiu31-Mar-05 2:55

Mircea Puiu

31-Mar-05 2:55

HWND hTB = ::FindWindow("Shell_TrayWnd", NULL);

SkyWalker

capture video frame

cher882303331-Mar-05 1:48

cher8823033

31-Mar-05 1:48

I want to capture video frames that is played by
Mediaplayer or other players.

Can anyone tell me how to do?

Re: capture video frame

DasdaDAS31-Mar-05 21:45

DasdaDAS

31-Mar-05 21:45

MCI_CAPTURE - use this command in the mciSendCommand()
this may help. just try that.

Zxczc

CDialog::Create fails

Jochen Tuemmers31-Mar-05 1:40

Jochen Tuemmers

31-Mar-05 1:40

Hi all,

I have a written a DLL that, during initialization, creates an instance of a dialog class derived from CDialog. This dialog contains a third party ActiveX control. If the DLL is loaded by an application, the creation of the dialog instance fails during the CDialog::Create method. If I remove the third party ActiveX from the dialog, everything is fine.

But, when I include the same ActiveX control into a dialog that is used in an application based on CWinApp rather than in a dll, it works perfectly well.

Any ideas?

Re: CDialog::Create fails

Mircea Puiu31-Mar-05 2:58

Mircea Puiu

31-Mar-05 2:58

Maybe you forgot OleInitialize()

SkyWalker

Re: CDialog::Create fails

Michael Dunn31-Mar-05 11:48

Michael Dunn

31-Mar-05 11:48

That is dangerous because in a DLL, you have no control over what type of apartment your code runs in. AX controls are apartment-threaded, so if the calling thread is in a MTA, or never called CoInitialize() at all, you're SOL.
See this post[^] for more info.

--Mike--
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Max Memory for a process

manirajesh31-Mar-05 1:24

manirajesh

31-Mar-05 1:24

Hi I am Mani Rajesh Kumar, working as Software Developer. I am currently developing an Image Processing Application
which deals with Large Amount of Data. I require as much as 2.5 GB of memory for my application. My System Configuration is
Microsoft Windows XP with Service Pack 1, 32Bit 2 GB RAM.
As we know By default OS allocates 2 GB memory for any single application.
I would like to know how to increase these 2 GB to 2.5 GB for a
single application.

Re: Max Memory for a process

David Crow31-Mar-05 2:29

David Crow

31-Mar-05 2:29

In theory, the most an application could get from the heap is 2GB. But since it is highly unliklely that 2GB of contiguous RAM is available, the practical limit will be much lower. Certain OSs support a /3GB startup parameter, but even then there would need to be 2.5GB of contiguous RAM available. Why do you need so much all at once?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Max Memory for a process

S. Senthil Kumar31-Mar-05 3:18

S. Senthil Kumar

31-Mar-05 3:18

What about virtual memory? Although it would involve heavy thrashing, it is possible to allocate upto 2 GB without having that much RAM with the help of virtual memory. I think the 2 GB limit is because of the size limitation of some internal data structures in the OS.

Regards
Senthil
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Re: Max Memory for a process

David Crow31-Mar-05 4:11

David Crow

31-Mar-05 4:11

Hopefully these few sites can help to clear this up:

http://blogs.msdn.com/oldnewthing/archive/2004/08/10/211890.aspx

http://www.brianmadden.com/content/content.asp?ID=69

http://blogs.msdn.com/oldnewthing/archive/2004/08/05/208908.aspx

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Max Memory for a process

Alexander ^M.,31-Mar-05 12:09

Alexander ^M.,

31-Mar-05 12:09

You don't need that much contiguous RAM because the OS does distribute the data using the CPU's paging system. That means that e.g. 100MB of virtual contiguous memory doesn't have to be contiguous in physical memory. That is also a problem for hardware (especially DMA hardware)... see Scatter/Gather.

@manirajesh: Use /3GB as parameter for windows startup (boot.ini), that will enlarge the maximum user-mode memory to 3GB and decrease the max. kernel-mode memory to 1GB.

Don't try it, just do it! Wink | ;-)

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