C / C++ / MFC Discussion Boards

Re: preprocessor directive

toxcct31-May-07 20:29

toxcct

31-May-07 20:29

Nilish wrote:
n the above line , is it right to say that #include is a pre processor directive.

yes. every keyword that starts with a # is a preprocessor directive, and is told to work before the compiler actually starts its processing, thus the name pre-processor.

something totally different, you should prefer including <iostream> rather than <iostream>.h (notice the .h at the end of the file name). I'm not even sure the later one exists...

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Re: preprocessor directive

Christian Graus31-May-07 21:21

Christian Graus

31-May-07 21:21

Oops - didn't see your reply. VS2005 is the first to not have iostream.h

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: preprocessor directive

Christian Graus31-May-07 20:59

Christian Graus

31-May-07 20:59

It's also true to say that it's not standard C++. The iostream.h header is deprecated and should not be used.

CreateFont

Nishad S31-May-07 19:39

Nishad S

31-May-07 19:39

In the MSDN documentation of CreateFont, it says that the font height is calculated by,
nHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);

Here, what is meant by the value 72 ?

- NS -

Re: CreateFont

Hans Dietrich31-May-07 20:46

Hans Dietrich

31-May-07 20:46

There are 72 points per inch.

Best wishes,
Hans

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Re: CreateFont

Nishad S31-May-07 21:22

Nishad S

31-May-07 21:22

But my doubt is that in the windows settings the default DPI is 96. This value got from the display properties (WinXP). So I am really confused from where this 72 came... Frown | :(

- NS -

Re: CreateFont

Mark Salsbery1-Jun-07 6:11

Mark Salsbery

1-Jun-07 6:11

NS17 wrote:
But my doubt is that in the windows settings the default DPI is 96

Which is why MulDiv is used to convert "dots" to points (using 72 which is the number of points in
an inch). Smile | :)

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: CreateFont

Rajkumar R31-May-07 20:51

Rajkumar R

31-May-07 20:51

LOGPIXELSY is the number of pixels per logical inch.
72 font point is one inch

more info
http://en.wikipedia.org/wiki/Point_(typography)[^]

Re: CreateFont

CPallini31-May-07 20:51

CPallini

31-May-07 20:51

Since on 72-dpi system you'll get (ignoring sign) nHeight=PointSize, I guess 72 it's, say, their (MS) reference display dpi.
(Of course it's only an hypothesis...)
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Adding custom menu in Front page (Add Ins)

Sameer_Thakur31-May-07 19:30

Sameer_Thakur

31-May-07 19:30

Hi all.

I want to add some custom menus in ‘Microsoft Front page’ application and also I want to handle click events on those custom menus.
Like…
I want to add custom menu and on click event of it, I want to open the currently selected image from Front page in MS-Paint.

This is something possible through ‘Add Ins’.
Can anybody please educate me more about creating ‘Add In’ Dlls, where to keep or how to register these Dlls with Front page?

A sample code for Add In Dlls would be most appreciated.

Thanks

Sameer Thakur

how to insert combo box in a tool bar?

bigphish31-May-07 19:17

bigphish

31-May-07 19:17

in my MFC applcn,i want to insert a combobox in a toolbar.hw to do this?

Re: how to insert combo box in a tool bar?

_AnsHUMAN_ 31-May-07 19:24

_AnsHUMAN_

31-May-07 19:24

See Here[^] and here[^]

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

Re: how to insert combo box in a tool bar?

Hamid_RT31-May-07 19:48

Hamid_RT

31-May-07 19:48

See Using ComboBox on a Flat Toolbar[^]

WhiteSky

SetFieldValue

hero199531-May-07 19:05

hero1995

31-May-07 19:05

What's wrong with these code: a new field named "Field19" is created. i wanna set all the values in Field19 are "abc:

CDaoDatabase db;
CDaoTableDef tableDef(&db);
db.Open("C:\\ktt.mdb");
tableDef.Open("Table3");
CDaoRecordset recset( &db );

tableDef.CreateField("Field19",dbText,255,dbUpdatableField | dbVariableField);

if ( !recset.IsEOF() )
recset.MoveLast();

while( !recset.IsEOF() )
{

recset.SetFieldValue("Field19","abc");

recset.MovePrev();

}

Re: SetFieldValue

Programm3r31-May-07 22:53

Programm3r

31-May-07 22:53

Hi,

Well it depends on the recset.SetFieldValue("Field19","abc"); function.

Is everything operating corrcetly inside the function?

Have you tried to use GetLastError()

What is the debugger informing you?

Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Save as..

Aint31-May-07 18:15

Aint

31-May-07 18:15

Hi.
In the MDI program that I've created, after I have "save as..", the title bar changed to the filename that I put in the save as dialog. How can I retain the old filename in the title bar?

Re: Save as..

Christian Graus31-May-07 18:26

Christian Graus

31-May-07 18:26

The title bar is set with SetWindowText. It's set by the framework, you'd need to change it after this occurs, but the thing is, the filename is obviously being saved in a member variable, if you change the frame text without changing this value, clicking save won't do what you'd expect. So, I'd recommend stepping into the MFC code to work out the stuff that happens in a save as that you want to reverse.

Re: Save as..

kishore j hp31-May-07 20:20

kishore j hp

31-May-07 20:20

Hi Aint,

You can overwrite SetTitle() in your CDocument derived class. This Method will be called after Sav'ing and Save As'ing.

Re: Save as..

Nelek31-May-07 22:15

Nelek

31-May-07 22:15

This is because after "saving as" you have your new file as active file/document in your app. One solution is already above, but you can make another thing (only if the old file was already saved, if new document won't be possible). You can override messages to save as.. a file, and just after the file is saved call OnCloseDoc () and OpenDocument () with the name of the old file. Then you will have the new copy of your file "saved as" but still continue working with the original file.

If the project is a new project... you can make a call to Serialize first to save the things in a default file, then call the save as and then the same as before.

But the fact is that 95% of the applications/programms work in that way. You always have active the file with the last save. I mean... if you open file1 and do some changes, then save as file2. You will have the file1 without changes in the HD, you will see the changes made in the file2 (and this one will be the active document automatically) and any posterior change will go automatically to file2, as long you don't open specifically the file1 another time.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: Save as..

Nelek31-May-07 22:16

Nelek

31-May-07 22:16

This is because after "saving as" you have your new file as active file/document in your app. One solution is already above, but you can make another thing. You can override messages of "save as.." in a file, and just after the file is saved call OnCloseDoc () and OpenDocument () with the name of the old file. Then you will have the new copy of your file "saved as" but still continue working with the original file.

If the project is a new project... you can make a call to Serialize first to save the things in a default file, then call the save as and then the same as before.

But the fact is that 95% of the applications/programms work in that way. You always have active the file with the last save. I mean... if you open file1 and do some changes, then save as file2. You will have the file1 without changes in the HD, you will see the changes made in the file2 (and this one will be the active document automatically) and any posterior change will go automatically to file2, as long you don't open specifically the file1 another time.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

How to get CPU usage in vista

Finix31-May-07 17:23

Finix

31-May-07 17:23

I use the method supplied by http://www.codeproject.com/system/MultiCPUUsage.asp in my project. It works fine in all platform except vista.
Anybody knows?

Re: How to get CPU usage in vista

Nelek31-May-07 22:07

Nelek

31-May-07 22:07

Mmmm, I don't know... but it seems that Vista is having a lot of problems. There are some Laptop providers that have returned all equipments with Vista and continued with XP. Just be patient until MS patches Vista's failures.

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

How to use CListCtrl with CImageList?

whiteclouds31-May-07 17:13

whiteclouds

31-May-07 17:13

I'm developing an application which can display some item with a thumbnail to show it is a file or folder. So I declare a variation as CImageList which include some image and a CListCtrl variation. Then attach them together. After those, I add item and image in CListCtrl and CImageList. But the image can't be display. I hope someone can help me. Thx!
The code is following.

//The code in InitDialog()
	clsImage=new CImageList();
	clsImage->Create(32,32,ILC_COLOR8,0,2);
	lsFile.SetImageList(clsImage,LVSIL_SMALL);
//The code in show function
		lsFile.SetRedraw(FALSE);
		for(i=0;i<ItemCount;i++)
		{
			memcpy(&name_len,p,sizeof(int));
			p+=4;
			pName=new BYTE[name_len+2];
			memcpy(pName,p,name_len);
			pName[name_len]='\0';
			pName[name_len+1]='\0';
			p+=name_len;
			kind=*p;
			p++;
			memcpy(time_str,p,16);
			CBitmap *bmp=new CBitmap;
			if(kind==1)
				bmp->LoadBitmapW(IDB_FILE);
			else
				bmp->LoadBitmapW(IDB_FOLDER);
			clsImage->Add(bmp,RGB(0,0,0));
			lsFile.InsertItem(i,(LPCTSTR)pName,i);
			delete bmp;
			delete pName;
			p+=16;
		}
		lsFile.SetRedraw(TRUE);
		lsFile.Invalidate();
		lsFile.UpdateWindow();

To be simplicated, I ommit some code to declare local variation.

whiteclouds

Re: How to use CListCtrl with CImageList?

Naveen31-May-07 18:03

Naveen

31-May-07 18:03

which view are you using in list control( Thumbnail,List, Report ... )?

nave

[OpenedFileFinder]

Re: How to use CListCtrl with CImageList?

Hamid_RT31-May-07 18:27

Hamid_RT

31-May-07 18:27

Are you sure bmp->LoadBitmapW(IDB_FOLDER/or IDB_FILE); is valid?

WhiteSky

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