How to write to a display that is not part of the desktop? - C / C++ / MFC Discussion Boards

IceBerG717-Apr-04 18:06

7-Apr-04 18:06

So u are saying using fread and fwrite is faster in performance as compared to WriteFile, ReadFile??

Sorry, i am evaluating which is better as i more used to fread and fwrite but now i exposed to another APIs WriteFile, ReadFile...The only gd thing about ReadFile is that the Handler obtained from CreateFile can be used for getting File Attributes..

Anyway, thanx for taking the time to answer my doubts

Re: File Database Access Method

Joe Woodbury7-Apr-04 18:36

Joe Woodbury

7-Apr-04 18:36

WriteFile is a low level call. It simply writes data to the disk. (The OS actually does some minor caching, but it's not significant.)

fwrite() writes data to an intermediate buffer (4k by default, I believe) when the buffer fills, the buffer is written to disk using a single call to WriteFile.

The same thing goes for reading data, only in reverse.

So, if you are reading/writing lots of smaller strings, you will get better performance with fread/fwrite unless you implement your own caching algorithm.

Note that you can get the original file handle by calling _fileno() with the proper FILE* and use that to call other functions directly (though doing any call that affects the file pointer (i.e. ReadFile, SetFilePointer, etc.) withough calling fflush first, will totally mess up the stream buffers.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Filtering OnFileOpen

J Guds7-Apr-04 11:54

J Guds

7-Apr-04 11:54

In a SDI program, when the user clicked the Open File Button and the standard File Open Dialog pops up I want to filter what type of file extensions the user can select.

J Guds
Masters Student
Kansas University

Re: Filtering OnFileOpen

valikac7-Apr-04 16:53

valikac

7-Apr-04 16:53

One solution is to instantiate a CFileDialog object and pass in a custom file-filter string.

Kuphryn

Re: Filtering OnFileOpen

avenger_sb258-Apr-04 12:34

avenger_sb25

8-Apr-04 12:34

The following code opens files with .wav extension
Modify it as per ur need.

void CMyProjectView::OnFileOpen() 
{
CFileDialog cfd(TRUE,".wav",NULL,OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST,"WAV File(*.wav)|*.wav||",this);
cfd.DoModal();
}

...Avenger

Remember... testing & debugging are always part of programming ...so exterminate those stinking bugs

GUI

eldar_20017-Apr-04 11:36

eldar_2001

7-Apr-04 11:36

Where can I find information on how to program interfaces as one in Windows Media Player 9 or something like that?

Re: GUI

valikac7-Apr-04 16:54

valikac

7-Apr-04 16:54

You mean you want to design a skinnable GUI?

Kuphryn

How to write to a display that is not part of the desktop?

Carla F.7-Apr-04 10:30

Carla F.

7-Apr-04 10:30

Confused I am indeed...

I have an application that I'd like to use a dedicated display for some
specialized data/graphics..

I've installed an extra display adapter in the machine, and I can find it
using EnumDisplayDevices() and get an identifier string for the DeviceName,
such as {"\\.\DISPLAY2"} . . . .

However, when I attempt to do a CreateDC for this device, I get back a NULL
unless I have configured the system to include this display device as part
of the desktop, and obviously any attempt to write to it doesn't work...

I'd really like to just use the second display for my application specific
graphics without worrying about someone sliding a window over the top of it
and overwriting it...

Any suggestions as to what I should be doing? - and pointers to appropriate
documentation?

Thanks in advance

Carla

getlastinputinfo

Anonymous7-Apr-04 10:13

Anonymous

7-Apr-04 10:13

we've used getlastinputinfo API in vc++ but it is showing the error as undeclared identifier. so please explain in detail how to use it?
by example

Re: getlastinputinfo

David Crow7-Apr-04 10:37

David Crow

7-Apr-04 10:37

Why start a new thread?

http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=784607&tid=784607#xx784607xx

Does this search provide any more help?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: getlastinputinfo

HAHAHA_NEXT7-Apr-04 10:42

HAHAHA_NEXT

7-Apr-04 10:42

Make sure you included the required files. (.h and .lib)
look at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/keyboardinputreference/keyboardinputfunctions/getlastinputinfo.asp[^]

Re: getlastinputinfo

Michael Dunn7-Apr-04 13:11

Michael Dunn

7-Apr-04 13:11

See the FAQ:
2.2 I'm trying to call a Windows API, but the compiler gives an undeclared identifier error (C2065). Why?[^]

--Mike--
Personal stuff:: Ericahist | Homepage
Shareware stuff:: 1ClickPicGrabber | RightClick-Encrypt
CP stuff:: CP SearchBar v2.0.2 | C++ Forum FAQ
----
"That probably would've sounded more commanding if I wasn't wearing my yummy sushi pajamas."
-- Buffy

HWND problem with ListControl

krugger7-Apr-04 10:02

krugger

7-Apr-04 10:02

Hi;
I am building an SDI application which requires a list control found on Tabs of a DialogBar. I managed to initialise the list control to some value. However, users of the tool are required to log-in and the list control is supposed to fill dynamically according to their log. I tried some piece of code to get it done but i got an ENORMOUS assertion error.

This is what i get when i move to debug mode:

_AFXCMN_INLINE int CListCtrl::InsertColumn(int nCol, const LVCOLUMN* pColumn)
{ ASSERT(::IsWindow(m_hWnd)); return (int) ::SendMessage(m_hWnd, LVM_INSERTCOLUMN, nCol, (LPARAM)pColumn); }

Can someone please help me to understand what this means and possibly how to overcome it. I badly need this.

Thank you;

Krugger

Re: HWND problem with ListControl

Prakash Nadar7-Apr-04 15:35

Prakash Nadar

7-Apr-04 15:35

It simplely means that the listcontrol was not created.. are you trying to insert something out of the scopeof the listcontrol variable or out of the dialog ???

MSN Messenger.
prakashnadar@msn.com

"If history isn't good, just burn it." - Sidhuism.

Clearcase Users

armentage7-Apr-04 10:00

armentage

7-Apr-04 10:00

My company uses Clearcase and VC6 to develop a large application, with thousands of .h/.cpp files, all under source control. My workspace loads up 15 seperate projects, which each contain as many as a hundred seperate source-controlled elements.

The thing is, workspaces open up SLOW. VC6 loads the actual workspace & projects up very quickly, but then stops for up to 10 minutes "Updating Source Control Status". I know Clearcase can, be slow, but this is too much.

Does anyone have any advice on how to speed things up? It seems that VC6 is checking the checked-in/out status of each file individually, blocking the whole app until it is done with the thousands of files I work with. Is there anything I can do make this process go on in the background, or surpress it altogether?

I would appreciate any insights or comments.

Re: Clearcase Users

David Crow7-Apr-04 10:40

David Crow

7-Apr-04 10:40

I've something similar except that the application has only two projects and maybe a hundred source files. It can take nearly a minutes to fully load. I think the IDE is just not up to handling that many files. For some of my smaller one-project applications, it loads 'em almost instantly.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

About BHO

Anonymous7-Apr-04 9:23

Anonymous

7-Apr-04 9:23

How can I get the contents of the IE's Address Bar using BHO

Jack

Re: About BHO

xxhimanshu7-Apr-04 19:51

xxhimanshu

7-Apr-04 19:51

use iwebbrowser2 's function get_addressbar... and u should get the contents..

himanshu

Unable to declare a const static int vairable ???

HAHAHA_NEXT7-Apr-04 8:57

HAHAHA_NEXT

7-Apr-04 8:57

I have my ATL built CoClass.
In its header file i have:
static const int MAX_SPEED = 500;

But the compiler refuses to compile and throw me this freaking error.

c:\documents and settings\antonz\desktop\anton\c++ tests\atlcarserver\atlcocar.h(41) : error C2258: illegal pure syntax, must be '= 0'

Can anybody enlighten an idiot. Dead | X|

Re: Unable to declare a const static int vairable ???

antlers7-Apr-04 10:38

antlers

7-Apr-04 10:38

You can't initialize a static const in the class definition (confuses the compiler).

Declare the variable in the class definition, then in the .cpp file put

const int CoClass::MAX_SPEED = 500;

Re: Unable to declare a const static int vairable ???

Maxwell Chen7-Apr-04 17:54

Maxwell Chen

7-Apr-04 17:54

ISO C++ allows 'static const' variables as class members, as:

// Either in .cpp or in .h.
class MyClass
{
  static const _iN = 3;
};

But not VC++6.

Poke tongue | ;-P

Maxwell Chen

Re: Unable to declare a const static int vairable ???

Mike Dimmick8-Apr-04 1:35

Mike Dimmick

8-Apr-04 1:35

At the risk of annoying whoever posted on this subject yesterday:

enum { MAX_SPEED = 500 };

The ability to initialise a constant within the class declaration was added to C++ quite late in the standardisation process, and VC6 doesn't support it.

Stability. What an interesting concept. -- Chris Maunder

Doubt in Property Sheets

P. Gnana Prakash7-Apr-04 8:56

P. Gnana Prakash

7-Apr-04 8:56

Hi all,

I have one doubt in creating the wizards using property sheets. In my application i created the three property pages (dialog) with the size of 250x175. But whenever i included with the property sheet, i can't fix the size of the property sheet. How can i rearrange size property sheet.

And i have one more doubt.. Whether it is possible to place the "Back" and "Next" button in the customized position. I would like to place the "Back" button on the Top Left corner and "Next" button on the Top right corner. Whether it is possible ?

Waiting for ur reply

Regards,
Prakash

A Journey of thousand miles must begin with a single step.

Re: Doubt in Property Sheets

David Crow7-Apr-04 10:42

David Crow

7-Apr-04 10:42

The size of a property sheet is governed by the size of the largest property page. Are you wanting to differ from that?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Stress test tools

Chen Venkataraman7-Apr-04 8:29

Chen Venkataraman

7-Apr-04 8:29

Hi,

Can anyone point me to some tools that would allow for simulating stress tests: excessive memory, resource handle usage for e.g.

We're running into issues related at production site & are trying to reproduce similar conditions in a test lab environment.

TIA

Chen Venkataraman

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.