Deleting directories - C / C++ / MFC Discussion Boards

Rickard Andersson²⁰31-Jan-02 7:12

31-Jan-02 7:12

I wonder how it works. Let's say that I have a header file named MyHeader.h

then I want to use the #ifndef stuff... but how?

Like this(?):

#ifndef MYHEADER_H
...
#endif

if yes:
how does the compiler know that MYHEADER_H is my header... hmm... hope you understand..

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©0d3 ©®4©k3® - That's me! Smile | :)

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Re: #ifndef _MYHEADER_H_???

Michael Dunn31-Jan-02 7:22

Michael Dunn

31-Jan-02 7:22

#ifndef MYHEADER_H
#define MYHEADER_H
  
// ...header contents here...
 
#endif

This prevents a header's contents from being #included more than once.

--Mike--
"Everyone has figured out what 'service pack' really means, so they had to go and change the language. Perhaps this is what Bill was talking about in the 'security is top priority' letter."
-- Daniel Ferguson, 1/31/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

Re: #ifndef _MYHEADER_H_???

Rickard Andersson²⁰31-Jan-02 9:45

Rickard Andersson²⁰

31-Jan-02 9:45

BUT OF COURSE!!

Thanks buddy(ies)!!!

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©0d3 ©®4©k3® - That's me! Smile | :)

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StretchDIBits / mem DC

pba_31-Jan-02 7:08

pba_

31-Jan-02 7:08

I want to scale a DIB into a window DC, and to do that I am using StretchDIBits - everything works fine. Because StretchDBits directly in the window DC is a very slow operation , I am trying to speed up the operation by stretching first into a mem DC and then draw the bitmap into the window DC using BitBlt. My problem is that StretchDIBits into the mem DC seems to have no result - nothing appears into the window DC. If I stretch directly everything works fine.

//
HBITMAP hBmp = ::CreateBitmap( /* ... */);
BITMAPINFO bmpInfo
// build bmp info

//original code
::StrectchDibits( hDC, /* ... */); //everything is OK

//updated code
HDC hMemDC = ::CreateCompatibleDC( hDC);

::StretchDBIits( hMemDc, /* ... */);
::BitBlt( hDC, /* ... */, hMemDC, /* ... /-*/); //!?

any help will be welcome ! Thanks .

Re: StretchDIBits / mem DC

Paul M Watt31-Jan-02 7:35

Paul M Watt

31-Jan-02 7:35

solon wrote:
//updated code
HDC hMemDC = ::CreateCompatibleDC( hDC);

After you create the MemDC, you will have a monchromatic bitmap with 1 pixel selected into that memdc. What you need to do now is to create a bitmap that has the proper height, width and color depth to match the Window DC that you want to paint to.

In order to do this you should use some code similar to this:

<br />
// Get the dimensions of the client window.<br />
RECT rClient;<br />
::GetClientRect(hWnd, &rClient);<br />
// Create the compatible bitmap to the window DC with the proper dimensions.<br />
HBITMAP hBmp = ::CreateCompatibleBitmap(hDC, rClient.right, rClient.bottom);<br />
<br />
// Select this new bitmap into the MemDC.<br />
(HBITMAP)::SelectObject(hMemDC, hBmp);<br />

Now you can continue with the code that you have previously written.

solon wrote:
::StretchDBIits( hMemDc, /* ... */);
::BitBlt( hDC, /* ... */, hMemDC, /* ... /-*/); //!?

Finally in order to cleanup, you must do things in this order.

<br />
::DeleteDC(hMemDC);<br />
::DeleteObject(hBmp);<br />

Static Text

Rajveer31-Jan-02 6:13

Rajveer

31-Jan-02 6:13

If I'm adding a static text control to my dialog box, how do I make the text come on more than one line? It seems to just write the text in one long line all the way across the dialog box. I realize that I could just use two static text controls and align them above and below one another, but I don't want to do this because then it gets treated as two seperate texts when doing the Tab Order.

Re: Static Text

Ravi Bhavnani31-Jan-02 6:28

Ravi Bhavnani

31-Jan-02 6:28

Change the style to multiline and resize the static control.

/ravi

"There is always one more bug..."
ravib@ravib.com
http://www.ravib.com

Deleting directories

Stan the man31-Jan-02 5:37

Stan the man

31-Jan-02 5:37

Hi.

I was wondering if there is an easy way to delete an entire directory and EVERYTHING under it. The functions that are available now seems to need the directory to be empty first.

THanks.

Re: Deleting directories

Rickard Andersson²⁰31-Jan-02 7:06

Rickard Andersson²⁰

31-Jan-02 7:06

I think this is going to work!!

Fill the SHFILEOPSTRUCT struct like this I think (not tested):

SHFILEOPSTRUCT shf;

memset(&shf,0,sizeof(shf)); // Reset the structure before using it

shf.hwnd = hWnd; // The windowe that will show status (e.g a progress bar that shows how much is left of the file operation)
shf.wFunk = FO_DELETE;
shf.pFrom = "C:\\WINDOWS"; // Delete this structure Smile | :)

shf.fFlags = FOF_SIMPLEPROGRESS; // Display a progress bar

// Finaly:
SHFileOperation(shf);

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©0d3 ©®4©k3® - That's me! Smile | :)

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Re: Deleting directories

Michael Dunn31-Jan-02 7:21

Michael Dunn

31-Jan-02 7:21

That will not work because pFrom needs two null characters at the end.

shf.pFrom = _T("C:\\windows\0");

--Mike--
"Everyone has figured out what 'service pack' really means, so they had to go and change the language. Perhaps this is what Bill was talking about in the 'security is top priority' letter."
-- Daniel Ferguson, 1/31/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.

Re: help please!

lucy31-Jan-02 6:55

lucy

31-Jan-02 6:55

how about:

void foo( char * boo )
// boo works as an in/out parameter

Re: help please!

Roger Allen31-Jan-02 7:36

Roger Allen

31-Jan-02 7:36

char* SomeFunction() ;

Roger Allen
Sonork 100.10016

If I'm not breathing, I'm either dead or holding my breath.
A fool jabbers, while a wise man listens. But is he so wise to listen to the fool?

Property page, last tab...

Braulio Dez31-Jan-02 4:41

Braulio Dez

31-Jan-02 4:41

Hi,

I would like that in my property page when the user presses over the last tab order control, it jumps to the first tab order contol, not to the tab header, is that possible ?

Thanks, Bye !
Braulio

Re: Property page, last tab...

Joaquín M López Muñoz31-Jan-02 5:00

Joaquín M López Muñoz

31-Jan-02 5:00

I'm not getting what you mean to do? Is it some sort of "circular" property sheet what you're trying to achieve?

PS: Si quieres nos entendemos en español, mucho más fácil Smile | :)

, aunque no sé si otra gente aquí se lo tomará a mal.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Property page, last tab...

Braulio Dez31-Jan-02 5:16

Braulio Dez

31-Jan-02 5:16

Hola !

HE he, si creo que si nos ponemos a hablar en Español igual Nish o otro se cabrean Smile | :)

, así que aquí va mi inglés potajero... Wink | ;-)

Yes, the thing is that I have a system made to update data automatically when you press tab or whatever

http://www.codeproject.com/dialog/killfocus.asp

It saved me a lot of boring work, ... but... If I use that on a Non modal Property Page I got a problem... when you press tab on the last control the focus goes to the parent and I cannot distinguish very well the event that happened, the good thing would be that it goes again to the first tab order control again.

Is there some possibility to do that ?

Gracias Joaquin !

Braulio

Re: Property page, last tab...

Joaquín M López Muñoz31-Jan-02 5:32

Joaquín M López Muñoz

31-Jan-02 5:32

I must confess I've not completely caught your point, so I will guess anyway Smile | :)

So your problem is that your property page loses control when the user press on the tab (control is taken over by the property sheet) and you'd like the property page to have an opportunity to retain control? If so, today some folks have had a similar discussion here, and seems like WM_NCACTIVATE is the message you should handle on your propery pages to determine when control goes elsewhere.

Hope it helps. Don't mind asking again if this is not what you were after.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Property page, last tab...

Braulio Dez31-Jan-02 5:44

Braulio Dez

31-Jan-02 5:44

Thanks !,

I´m gonna try the OnActive thing, but I would like to do it generic, do you know anyway to get the first control that have a tab stop ? ( just a function named like... "FirstTabOrderCtrl()" or something like that Smile | :)

Thanks again, Bye !
Braulio

Re: Property page, last tab...

Joaquín M López Muñoz31-Jan-02 6:12

Joaquín M López Muñoz

31-Jan-02 6:12

You know what? Seems like calling SetFocus on the property page itself yields control to its first control (with respect to tab order). At least I've just tried it with a CDialog and it works.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Property page, last tab...

Braulio Dez31-Jan-02 6:22

Braulio Dez

31-Jan-02 6:22

Thanks good tip !

The only problem is that OnActive is not called when the user presses the tab because it already has the focus ( crazy stuff... ).

Hasta luego Joaquin !, me rindo por hoy mañana me pondré de nuevo, con la cabeza más fresca Smile | :)

Un saludo
Braulio

HLVDD.DLL hardlock virtual device failed initialization

RobJones31-Jan-02 4:40

RobJones

31-Jan-02 4:40

Has anyone seen this error under windows xp before? I have a very simple application using a list control.. when the app is first launched I get the error "HLVDD.DLL hardlock virtual device failed initialization" What is this?

Thanks,

Rob

Re: anyone knows this error?

C^hris L^osinger31-Jan-02 4:37

C^hris L^osinger

31-Jan-02 4:37

marouane miftah el kheir wrote:
how do i fix it?

don't use the same name for two different classes.

-c

Smaller Animals Software, Inc.

Re: anyone knows this error?

Alvaro Mendez31-Jan-02 5:00

Alvaro Mendez

31-Jan-02 5:00

1. Make sure the class is only defined in one place (header file).
2. Make sure the contents of the header file are only included once. Use guard macros to prevent that:

#ifndef __STOCK_H__
#define __STOCK_H__
 
class Stock
{
...
};
 
#endif // __STOCK_H__

Regards,
Alvaro

C and Visual C++

aleyah31-Jan-02 3:59

aleyah

31-Jan-02 3:59

Hello..
I want to know something! In Visual C++ also can use C code, but can or not C code in same project call C++ function??
like this, my C code is in what.c and I want to call function in loginDlg.C++, the function name is CLoginDLg...
i try do this in file what.c
CLoginDlg dlg;
dlg.DoModal();

but this error appear when i compile it
error C2065: 'CLoginDlg' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'dlg'
error C2065: 'dlg' : undeclared identifier
error C2224: left of '.DoModal' must have struct/union type
anybody can help me.. or i do wrong!!??

Re: C and Visual C++

Simon Walton31-Jan-02 4:43

Simon Walton

31-Jan-02 4:43

If you post some code perhaps we can help you. Smile | :)

Simon
C++: Only friends can see your private parts.
Sonork ID 100.10024

Re: C and Visual C++

aleyah31-Jan-02 4:59

aleyah

31-Jan-02 4:59

where to i post my code in this forum??

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