C / C++ / MFC

26-Sep-02 1:41

You might notify your CDocument about view changing and then inform all views by means of UpdateAllViews (see MSDN). Create some flags in CYourDocument, which describe document state at that moment, when you update views. Each view will look at this flags and will decide whether must it make update of itself or not. Or you can manage updating of views from CYourDocument class and decide here which view needs update.

Also you may find specified view by means of GetFirstViewPosition/GetNextView but I do not recommend to link views directly. It is better to use technique described above.

ere FTP question

Renjith Ramachandran25-Sep-02 23:49

Renjith Ramachandran

25-Sep-02 23:49

friends,

i wrote an application to download the files from an FTP server by using the CFtpConnection,CInternetSession and CFtpFileFind...

my application will check the ftp server in a time interval,and if there is any files then simply download them..i used this program to collect files in which other users upload to that ftp server

i used the GetFile() method to download the file...but my problem is that...if there is any files they are not completley Transfered(transfering in progress),they are also downloads.ie i get some incomplete /damaged files

Is there is any way to identify the Files in which they are in the Status of Transfering(copying to server),ie not completely uploaded to the server....

hav any idea..??

A Programmer Never Dies..***

Re: _DEBUG question

Tomasz Sowinski26-Sep-02 2:21

Tomasz Sowinski

26-Sep-02 2:21

In the release build, _DEBUG isn't defined. #ifndef _DEBUG evaluates to true at compile time and code is included.

ns wrote:
Or is there something like _RUN or something that makes code run at runtime thats within #ifdef _RUN execute?

I don't know what do you mean by this.

Tomasz Sowinski -- http://www.shooltz.com

*** Vodka. Connecting people. ***

Listbox

suresh_sathya25-Sep-02 22:45

suresh_sathya

25-Sep-02 22:45

I have 10 items in the listbox.when i scroll the vertical scroll bar downwards,say some three items gone up.So the first three items is not visible to user.How to programmatically find out that the first three items is not visible.

Re: Listbox

Steve S25-Sep-02 22:56

25-Sep-02 22:56

GetTopIndex() will tell you which is the top visible item. After that, it's not rocket science Smile | :)

to figure it out.

Steve S
[This signature space available for rent]

Re: Listbox

Steve S26-Sep-02 23:46

26-Sep-02 23:46

Just for the rocket scientists out there;P

If you know the height of one item (htItem), (LB_GETITEMHEIGHT) and you know the client height of the list (htClient), you can, by dividing htClient by htItem, determine the number of visible items.

If you then know the top index, you can also work out the bottom index.
To make items become visible programmatically, you can scroll the list by calling SetTopIndex (in MFC, message is LB_SETTOPINDEX) appropriately.

If you resize the list box, you have to recalculate, of course

Steve S
[This signature space available for rent]

Create Dialog

Anonymous25-Sep-02 22:44

Anonymous

25-Sep-02 22:44

I'm migrating from VC++ 6.0 to VS.net. I created dialog resources, but don't know how to create a CDialog derived dialog for it the dialog resource.

Roman Fadeyev25-Sep-02 23:15

25-Sep-02 23:15

Open popup menu above dialog resource and choose "Add Class".

Anonymous25-Sep-02 23:34

Anonymous

25-Sep-02 23:34

I don't see "Add Class". I only see "Add Class" when I selected the project name, but it just show me a normal Class add dialog without the way to specific the Dialog template resource.

When i right click in the dialog resource, I see

Cut
Copy
Paste
Delete
--------
Resource Includes
Resource Symbols
--------
Open
Open Binary Data
--------
Save Myproject.rc
Add Resource...
Insert Copy
Insert Dialog
Export

Roman Fadeyev25-Sep-02 23:58

25-Sep-02 23:58

There is no anything surprising because you click in resource tree window although the right way is to click on dialog itself

The difference between VERIFIY() and ASSERT()...

Anonymous26-Sep-02 0:37

Anonymous

26-Sep-02 0:37

Thanks very much. I got it. No matter why I coudln't find it coz i was puzzling with the resource tree. haha ...

Raphael Kindt25-Sep-02 21:51

Raphael Kindt

25-Sep-02 21:51

Hello world.

Can anybody tell me what's the difference between those MACRO in MFC:

ASSERT( booleanExpression )

and:

VERIFY( booleanExpression )

I know what they mean but I don't see any difference...

Thanks in advance...

Hello World!!! Smile | :)

from Raphaël

Re: The difference between VERIFIY() and ASSERT()...

Steve S25-Sep-02 21:58

Re: The difference between VERIFIY() and ASSERT()...

25-Sep-02 21:58

Unless AdamUK beats me to it again...

ASSERT disappears in a release build, while VERIFY doesn't.

For example,

ASSERT( ( p = somefunction() ) != 0)

VERIFY( ( p = somefunction() ) != 0)

In the first case, the code is =eliminated= and will more than likely cause some hapless (or should that be witless) developer to tear out their hair trying to figure what's gone wrong. In the second case, the code is retained, but no test is actually performed.

At least, that's how they used to work...

Steve S
[This signature space available for rent]

yourbuddy7726-Sep-02 1:17

yourbuddy77

26-Sep-02 1:17

check out this link for more info:
http://gamedev.net/reference/articles/article1846.asp

Can somebody explain these lines for me?

Mazdak25-Sep-02 21:29

25-Sep-02 21:29

	if (remaining & pAccess->dwValue)
	{
		remaining &= ~pAccess->dwValue;
//		DoSomething(pAccess->szName);
	}

remaining is a typedef DWORD structure and pAccess is a structure and dwValue is DWORD type.
What does one & mean?And what does its next line means?:remaining &= ~pAccess->dwValue;

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

adamUK25-Sep-02 21:45

adamUK

25-Sep-02 21:45

Mazy,

The & operator is the bitwise 'AND' operator. Your code takes dwValue and performs a bitwise and operation with remaining. Eg if remaining = 0000101011 and dwValue = 0100011001 then the result is 0000001001 (in binary)

If the if statement is nonzero, it executes the remaining code.

x&=y is equivalent to x=x & y (the bitwise operator again)

~ is the bitwise ones complement (or NOT operator) i.e. 010101 becomes 101010 in binary.

So, remaining &=~pAccess->dwValue is equivalent to
remaining=remaining & ~pAccess->dwValue

Hence the bits in dwValue are complemented (ie. all the 1s turn to 0s and the 0s turn to 1s) it is then 'AND'ed with remaining and the result stored in remaining.

Hope this clears things up
Adam.

www.beachwizard.com/travelogue[^]

"I spent a lot of my money on booze, birds and fast cars. The rest I just squandered"
George Best.

Mazdak25-Sep-02 22:21

25-Sep-02 22:21

Thank you very much. Smile | :)

Mazy

"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down

Steve S25-Sep-02 21:46

25-Sep-02 21:46

Relatively simple, & is a binary AND, while ~ is a binary NOT.

For instance, if "remaining" contains 127 (0x7F, or 01111111 binary),
and pAccess->dwValue contains 6 (0x6, 0110 binary), the ~ flips the bits
in pAccess->dwValue, so it contains 0xFFFFFF9, and then it's ANDed with
the "remaining" value

0111 1111 (remaining)
1111 1001 (dwValue)
---------
0111 1001

which is then stored in remaining.

It's a common technique used to turn off bits in one value that are set in another.

Steve S
[This signature space available for rent]

Mazdak25-Sep-02 22:20

25-Sep-02 22:20

Thanks.I got the point. Smile | :)

listbox question

Mazdak25-Sep-02 20:59

25-Sep-02 20:59

I have list box.When I fill it for second time I want previous items deleted and new ones shown.I use ResetContent but items do not deleted.I use this code:

m_listgrowp.ResetContent();
for(int i=0;i<(int)strSidArray.GetCount();i++)
    m_listgrowp.AddString(strSidArray.GetAt(i));
strSidArray.RemoveAll();

Re: listbox question

Roman Fadeyev25-Sep-02 23:35