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Re: can someone write a simple programm for me it should just take a minute

Ian Darling1-Feb-04 12:10

Ian Darling

1-Feb-04 12:10

jaapdeboer wrote:
In the book that I hired from the library and another one that I have at home both say this:

#include iostream.h

void main(void)
{
cout << "hello world";
}

Not being funny, but those books are either full of crap, or seriously outdated (by at least 5 or 6 years). main returning void is non-standard (it can accept a void type for the parameter list). main does not require a return, however if it is missed, then there is an implicit return 0 included.

Ian Darling
"The different versions of the UN*X brand operating system are numbered in a logical sequence: 5, 6, 7, 2, 2.9, 3, 4.0, III, 4.1, V, 4.2, V.2, and 4.3" - Alan Filipski

Display transparent PNG in CDialog

Michael P. Mehl31-Jan-04 23:42

Michael P. Mehl

31-Jan-04 23:42

Hi!

I'd like to display a transparent PNG in a CDialog using MFC. How to do that best?

Kind regards...
Michael

Re: Display transparent PNG in CDialog

Joaquín M López Muñoz1-Feb-04 2:56

Joaquín M López Muñoz

1-Feb-04 2:56

I've used Davide Pizzolato's CxImage[^] library to do this sort of stuff; it works like a charm.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

installer question

andyg.10131-Jan-04 23:21

andyg.101

31-Jan-04 23:21

Hi, I've been coding visual c++ for a while now, and made a couple of nice little MFC applications. However I have a kind of general question about the next stage. I can get the applications to work from visual C++ but obviously that's not ideal for distribution, so my question is (sorry if this is stupid)

1. What exactly is the purpose of an installer i.e. install shield etc, as when I build my app in c++ i just get an exe file, no changes in registry or other files?(don't think my question is well worded Hmmm | :|

)

2. Where do i get one/ how do i implement it.

Thanks

Andy

ps another question if i want to read a particular file format into my application say *.jpg for example, how can i do this, surely I don't have to write the code from scratch or do I have to buy a proprietary library?

Re: installer question

Joaquín M López Muñoz1-Feb-04 2:54

Joaquín M López Muñoz

1-Feb-04 2:54

1. Your program usually has a number of dependencies, which most commonly are DLLs implicitly used by your program at run-time. An installer makes sure that the target machine already has these DLLs and install the missing ones (an installer can do quite some things more, but this is its main functionality.) Most DLLs are system DLLs and you won't have to worry about them. Make this little test: copy your executable to a fresh machine (OS just installed) and see what happens. The system will guide you about what DLLs are missing. One important case is MFC distribution DLLs: usually, it is preferrable to build your app as statically linked against MFC (see project settings, first tab) so that you don't depend on MFC DLLs at all.

2. Most known commercial installers are InstallShield and Wise (google for them.) Windows has its on installation technology called Windows Installer, but it requires some preloaded services in the target machine which are not natively supported by older OSs. Pablo van der Meer has written a Little Install Builder[^] which may suit your needs.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: installer question

[Anders]1-Feb-04 7:48

[Anders]

1-Feb-04 7:48

try

nsis

or

inno setup

Re: installer question

Jim Crafton1-Feb-04 14:08

Jim Crafton

1-Feb-04 14:08

i want to read a particular file format into my application say *.jpg for example, how can i do this, surely I don't have to write the code from scratch or do I have to buy a proprietary library?

There are a bunch of different ways to do this.
There are articles here on code project that show how to do this, and there's also FreeImage project (http://freeimage.sourceforge.net/). There are lots of other ones as well, google is your friend Smile | :)

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mpeg2 video Stream length

yogev31-Jan-04 23:18

yogev

31-Jan-04 23:18

hi,
I've have a simple filter graph that takes a mpeg2 file and write its video and audio streams 2 into separate files.

I'm interested in knowing the stream duration prior to playing the graph.
I've used the IMediaDet interface to get the stream length, and also the IMediaSeeking interface (= GetDuration method) and both gave me a time that is longer then the actual stream length time.

i've used a sample grabber in order to count the number of frames and i get allways that the number of frames the methods gave me arn't to the number of frames i've counted using the sample grabber.

Is there another way to know the stream length after i have the graph.

thank in advace

Yogev Cohen

Switching between applications

techysavvy31-Jan-04 23:07

techysavvy

31-Jan-04 23:07

Hi folks....
How do we switch the focus to another application using its filename in VC++???
heeellllpppp Confused | :confused:

Pooja

Re: Switching between applications

__Cerb1-Feb-04 4:01

__Cerb

1-Feb-04 4:01

HWND hwnd = ::FindWindow(NULL,"Program name");
::PostMessage(hwnd,WM_SETFOCUS,0,0);

This should do it.

~Michael

Re: Switching between applications

techysavvy3-Feb-04 1:31

techysavvy

3-Feb-04 1:31

Hey thanx... Cool | :cool:

this code works better:

CWnd *pWnd = FindWindow(NULL,”My Application”);
pWnd->SetForegroundWindow();

About MSXML

Anonymous31-Jan-04 22:17

Anonymous

31-Jan-04 22:17

Hi all

I wrote a big MFC app wich uses MSXML.
I use it in this way:

MSXML2::IXMLDOMDocumentPtr pDoc(CLSID_DOMDocument)
pDoc->...
...

Few days ago I've installed MSXML 4.0.
Do I have to change my code in order to use the new version? to something like this:

MSXML2::IXMLDOMDocument2Ptr pDoc(CLSID_DOMDocument40)

Or my previouse code will be fine and use the new MSMXL objects?

thanks a lot!

Re: About MSXML

Michael P Butler1-Feb-04 8:16

Michael P Butler

1-Feb-04 8:16

Anonymous wrote:
Or my previouse code will be fine and use the new MSMXL objects?

Your current code should continue to work (providing Microsoft followed it's own rules on not changing interfaces in COM objects).

COM objects are designed to be backwards compatabile. The only reason you might need to change your CLSID or IID's is if you want to use newer functionality.

Michael

But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel

Re: About MSXML

Anonymous2-Feb-04 4:42

Anonymous

2-Feb-04 4:42

Ok, I understand that, but there are some fixes and performance improvments between the versions. Same Interface will have a better implementation in MSXML 4 then in previous versions, or maybe I'm wrong?
My question is: if I'll leave the code as its now, will it work in the best way and provide the best performance MSXML can provide?

thanks.

Advice on Enumerating and Searching Folders Needed

Roger Wright31-Jan-04 19:29

Roger Wright

31-Jan-04 19:29

Over time, as I download various bits from the Internet, things tend to get widely distributed on my hard drives. In this particular instance, image files are all over the place, in download folders, in Administrator and User folders - it's a mess. I'd like to create a utility that allows me to enter a file descriptor - a regex might be a good way to do this - and a destination folder, then traverse the entire set of drives and their contained folders to send copies of matching files to the destination folder. Ideally the program would also detect version numbers or last modified dates and only copy the most current versions. What's got me stumped a bit is how to organize the search.

Should I enumerate the top level folders and process them first, then move down a layer and repeat, or should I follow a directory chain to its end before processing the next top level folder? What is a good data structure for keeping track of where I am in the process, and which folders have already been processed? In some ways, the process reminds me of the challenge of traversing rule bases in Prolog, without the cuts, and I never progressed far enough in that language to really get into the implementation details. While I'm at it, will Hidden and System folders be invisible to the process, or does that only apply to displays in Explorer?

Thanks for any suggestions... This might make for a decent Beginner article when it's completed, and I'll be sure to mention any who helped along the way. Smile | :)

Heard in Bullhead City - "You haven't lost your girl -
you've just lost your turn..." [sigh] So true...

Re: Advice on Enumerating and Searching Folders Needed

ColinDavies31-Jan-04 20:55

ColinDavies

31-Jan-04 20:55

Roger Wright wrote:
Should I enumerate the top level folders and process them first, then move down a layer and repeat, or should I follow a directory chain to its end before processing the next top level folder?

I don't think it will make any difference, to the outcome, if you do it right.

Regardz
Colin J Davies

* WARNING *
This could be addictive
The minion's version of "Catch Green Alien | [Alien] "

It's a real shame that people as stupid as you can work out how to use a computer. said by Christian Graus in the Soapbox

Re: Advice on Enumerating and Searching Folders Needed

Neville Franks31-Jan-04 22:58

Neville Franks

31-Jan-04 22:58

Directory searches are typically done using a recursive routine and going depth first. Using this approach you don't need to keep track of where you've been. You can get into a mess if you are moving files around etc. under the feet of code that is iterating files. It can be easier and certainly safer to use two passes, one to build the list of files that need to be moved (or whatever) and a second to do the work.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Advice on Enumerating and Searching Folders Needed

Roger Wright1-Feb-04 3:22

Roger Wright

1-Feb-04 3:22

Good thought, and similar to the approach I was discussing with Colin in the wee hours this morning. But then it occurred to me (apparently in my sleep I was still working on it) this morning that the app could get really confused if some process made a change to the file structure after the first pass. That's probably a small risk, though. It might be entertaining and instructive to populate a tree control on the first pass and display it, then expand each node as it is being processed, changing colors or something to indicate completion. It certainly will be a good exercise for my edification! Smile | :)

Heard in Bullhead City - "You haven't lost your girl -
you've just lost your turn..." [sigh] So true...

Boost smart pointers - can I do this?

Neville Franks31-Jan-04 19:04

Neville Franks

31-Jan-04 19:04

I'm using code like the following to Post some information and instead of using new and delete I'd like to use a smart pointer so I don't need to manually do the delete. I've read over the Boost smart pointer library but can't really see if this is possible. I do use boost scoped_ptr<> to good effect.

CMyClass::MyFunc()
{
   CMyClass* pMyClass = new CMyClass;
   PostMessage( WM_USER_MYMSG, reinterpret_cast<WPARAM>( pMyClass ), 0 );
}

// Message handle for WM_USER_MYMSG
LRESULT CMainFrame::OnUser_MyMsg( WPARAM wParam, LPARAM lParam )
{
    CMyClass* pMyClass= reinterpret_cast<CMyClass*>( wParam );
    // do stuff with pMyClass
    delete pMyClass;   // I want to loose this!!
}

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Re: Boost smart pointers - can I do this?

Joaquín M López Muñoz1-Feb-04 2:12

Joaquín M López Muñoz

1-Feb-04 2:12

Well, you can modify the receiving code like this:

LRESULT CMainFrame::OnUser_MyMsg( WPARAM wParam, LPARAM lParam )
{
  boost::scoped_ptr<CMyClass> pMyClass(reinterpret_cast<CMyClass*>(wParam));
  // do stuff with pMyClass, no need to explicitly delete
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Boost smart pointers - can I do this?

Neville Franks1-Feb-04 12:01

Neville Franks

1-Feb-04 12:01

Hi Joaquín,
Thanks for the reply. I assume you mean by changing the new to use a boost smart ptr. If so which one, shared_ptr?

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Create a Popup IE window from C++

Shutter31-Jan-04 16:32

Shutter

31-Jan-04 16:32

I know I can launch an HTML page with IE by using ShellExecute. But how do you create a popup window that doesn't have toolbars, status bar, etc.? Much like window.open in javascript.

Re: Create a Popup IE window from C++

Neville Franks31-Jan-04 18:52

Neville Franks

31-Jan-04 18:52

Shutter wrote:
I know I can launch an HTML page with IE by using ShellExecute. But how do you create a popup window that doesn't have toolbars, status bar, etc.? Much like window.open in javascript.

You can create a dialog and embed the MSHTML control in it. See: http://msdn.microsoft.com/downloads/samples/internet/default.asp?url=/downloads/samples/internet/browser/htmldlg/default.asp[^] amonst others on MSDn and here on CP.

Neville Franks, Author of ED for Windows www.getsoft.com and coming soon: Surfulater www.surfulater.com

Adobe Acrobat Reader OCX problem

Alex Korchemniy31-Jan-04 16:23

Alex Korchemniy

31-Jan-04 16:23

When I load a xfdf file into the control it stops responding. This is strange since acrobat reader.exe loads xfdf's without a hitch. Anyone have a solution or ran into this before?

Re: Adobe Acrobat Reader OCX problem

S^nyp31-Jan-04 16:59

S^nyp

31-Jan-04 16:59

I don't understand... are you trying to implement the OCX on your application? Or is it that your getting an error with Adobe Acrobat Reader.. you should ask them, but if you mean like using it in your own application... I think you need a license for it and there is a lot of security built into it, probably the Adobe style Smile | :)

anyways, you should ask them for more info.

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