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im trying to open a file that is on a web server how can i do it?, i did this but it fails
CFile Arch;
Arch.Open("www.mypage/file.zip",CFile::modeRead);
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use CHttpFile which can fetch files from the web
--
Help me! I'm turning into a grapefruit!
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Hey all.
I'm not a newbie to Windows programming or multi-threading, but I've been wondering: how exactly does the implementation of ::MessageBox(...) work?
I have a simple single-threaded application.
I call ::MessageBox(...) somewhere in the code. The message box APPEARS to be blocking the code execution, since the line after the "::MessageBox(...)" will only be executed after the message box is dismissed. However, my single-threaded application is still processing messages!
How is this magic performed behind the scenes?
Thanks!
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Probably because your message loop continues to process messages such as WM_PAINT.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
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Actually, Cristian (and correct me if im wrong) but i dont see how yr message loop can be working if yr appliaction has called message box...
I think this is VERY good question for beginners like us.
Im sure that messagebox domodal, etc. call a hoorrible nasty "PeekAndPump" type MS fudge.
Any corrections?
Dave Carkeet.
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David Carkeet wrote:
Im sure that messagebox domodal, etc. call a hoorrible nasty "PeekAndPump" type MS fudge.
Actually, from memory it sets a flag for the app so that the window stops responding, but the message pump keeps right on pumping. I think Nish said something similar, he may know more about it than I do.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
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MessageBox is just a function which displays a particular dialog box, which a few bells and whistles.
From the documentation of ::DialogBox () in the Platform SDK:
"The function displays the dialog box (regardless of whether the template specifies the WS_VISIBLE style), disables the owner window, and starts its own message loop to retrieve and dispatch messages for the dialog box."
So, the function has its own message loop. It will also retrieve messages for the rest of your application
(e.g. WM_PAINT) and dispatch them to the appropriate handler. The MFC glue routes it eventually to your
routine (such as CView::OnDraw (...)).
Enlightened?
Iain.
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I think it creates a mode dialog,and show it by DoModal(),so only if you
press OK or Cancel,the following codes will be executed.
Cheers
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When a MessageBox is invoked, the parent window is disabled. Thus it cannot take mouse clicks or keyboard hits, BUT it can handle all messages sent or posted to it directly like the paint messages. When the MessageBox is dismissed the parent window is re-enabled!
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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Hi.
I would like to switch the style of two buttons to/from default. For example, initial ButtonA is the default button. As the user selects an option in a dialog box, ButtonB becomes the default button and buttonA becomes a normal button.
I try changing the style of buttonB via SetStyle(BS_DEFBUTTON), however, that solution only highlights buttonB as though it is default. Nothing happens when I push Enter. When I push, Windows sends a message that buttonA is pushed. I set buttonA to default via Properties.
Do you have to set the current default button to something else before setting another button to default?
Thanks,
Kuphry
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Interesting! You are right. I am trying to change the style of buttons belong to IDOK and IDCANCEL.
Kuphryn
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Wow. Jeff Partch posted a response at MSDN Newsgroups and mentioned something about "HOWTO: Change or Set the Default Push Button in a Dialog Box." The solution is much more involved than I have anticipated.
Kuphryn
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Okay. Pryrates of CodeGuru posted a solution that works flawlessly. A special thanks to Pryrates for such an elegant solution.
http://www.codeguru.com/forum/showthread.php?s=&threadid=197179
Here is the final code.
-----
void CDialog::SetDefaultBtnOk()
{
DWORD style = m_BtnOk.GetStyle();
// make sure ButtonOK is not already the default button
if ((style & BS_DEFPUSHBUTTON) != 1)
{
style = m_BtnClose.GetStyle();
// remove default push button style
style &= ~BS_DEFPUSHBUTTON;
// set the style
::SendMessage(m_BtnClose.GetSafeHwnd(), BM_SETSTYLE, (WPARAM)style, (LPARAM)TRUE);
// inform the dialog about the new default control id
SendMessage(DM_SETDEFID, m_BtnOk.GetDlgCtrlID());
// get the style
style = m_BtnOk.GetStyle();
// add the default push button style
style |= BS_DEFPUSHBUTTON;
// set the style
::SendMessage(m_BtnOk.GetSafeHwnd(), BM_SETSTYLE, (WPARAM)style, (LPARAM)TRUE);
}
}
-----
The second function SetDefaultBtnClose() is the compliment of the above.
Kuphryn
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Hi i have a CWebBrowser in my dialog,
when i create it the vertical scroll bar is drawn but disabled
how can i make the scollbar disappear altogether and not be shown?
bryce
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At a guess you could call
ShowScrollBar(SB_VERT, FALSE) ;
On the CWebBrowser object.
Roger Allen
Sonork 100.10016
If I had a quote, it would be a very good one.
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I am developing an application that will gather much data from the user, thrash about on the data, then build a document to be printed. I have a copy of the approved document as a MS-Word file, but will not be saving the document, so I can print it anyway I please, so long as the layout is the same. My question: what's the best and/or easiest way to do this? I am guaranteed that all target machines will have Word on them, as well as any other software I require (I'd prefer to have a low-budget solution).
Thanks,
Glenn
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Glenn E. Lanier II wrote:
what's the best and/or easiest way to do this?
1. Create a temp filename (tmpfile or whatever you like).
2. Save the file under that name.
3. ShellExec (I believe could do it) with "winword.exe /p" "filename". Check the registry how it prints a MS Word document. You could probably go fancy by using COM and crap also, but why pay that penalty...
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Thanks, but what I'm really trying to determine is the best way to modify the document programatically.
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Glenn E. Lanier II wrote:
Thanks, but what I'm really trying to determine is the best way to modify the document programatically.
AFAIK the only way you can do this (using MS Word's "remote control" facility) is by using its COM interface.
Take note that you'll get one helluva large header file, including a function that takes 31 (!) parameters, and none of'em have default values.
Enjoy! :->
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Can anyone tell me the difference between Direct3D and OpenGL, in short.
What's the fastest?
The most stabile?
...
and what's your experience with those two api's.
tnx.
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Direct3D uses custom drawing structures called Surfaces which can be locked down for exclusive drawing, whereas OpenGL uses the Device Context (DC) for its drawing surfaces. Advantages of OpenGL is that it is probably more familiar (easier to learn) to experienced C++ programmers who are starting out with these API's, the code is more portable and the result will work on practically any system (provided it was compiled for that system). Advantages of Direct3D (therefore disadvantages of OpenGL) are that their surface implementation is supposedly faster, it is designed and dedicated to Microsoft based systems (why use something more general when you can use something that really takes advantage of Windows? methodology) and all Microsoft X-Box games are made using Direct3D (what a surprise) and have you seen how amazing they look? All in all this question is not an easy one, OpenGL USED to be THE platform to learn, but Microsofts more recent Direct3D API's really do give it a run for its money. You will find hardcore fanatics of both, but personally I find Direct3D a little fiddly and annoying, though I tend to use it more for some reason ???(probably because I develop for windows).
Alan.
"When I left you I was but the learner, now I am the master" - Darth Vader
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Can anyone tell me the difference between Direct3D and OpenGL, in short.
Probably not. This has been an issue of many discussions, but what has emerged AFAIK is that your OpenGL knowledge still counts in five years from now. What you know about D3D now will most certainly be obsolete in a very short time (judging by the rate MS drops "obsolete technology" as they call their badly designed stuff).
OpenGL was designed by people that knew 3D gfx. Let's see someone accuse MS of the same knowledge. 
What's the fastest?
In terms of FPS on Windows? Usually D3D (unless you need multiple 3D views in case D3D's limits can bite you quite badly). For any other case the answer is obvious.
The most stabile?
OpenGL. No dubt about it!
OpenGL has been around for over a decade now. D3D has been around, what, 2-3 years? And during those years the API has changed how many times? 2? 3? More? :->
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Why not directly programming with one abstraction higher: NVidia has release a new language called Cg, "C for Graphics", it :looks like ainsi C but with new types and functions and a redesigned main loop.
When programming in Cg, you should be able to compile for OpenGL, D3D and XBox by changing a line of code. I think.
Cheers,
Jonathan de Halleux, Belgium.
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Does anyone know if VC++ 6 supports member templates?
Dave
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