C / C++ / MFC Discussion Boards

Joaquín M López Muñoz28-Apr-02 11:33

28-Apr-02 11:33

If the string is not (doubly) null-terminated, this will result in the program trying to read beyond the string contents (which can cause a GPF or a meaningless output.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: API: replacing chars

Nish Nishant28-Apr-02 14:13

Nish Nishant

28-Apr-02 14:13

Hi Gregor

When you have strings that contain nulls or strings that are not not null terminated, you can use the buffer manipulation functions instead of the string manipulation functions. Look them up on MSDN.

Nish

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Re: API: replacing chars

Mike Nordell1-May-02 10:19

Mike Nordell

1-May-02 10:19

char foo[] = "bar\0baz\0whatever";
std::replace(foo, foo+sizeof(foo), '\0', '+');

CListView & Appending Items :: MFC

valikac28-Apr-02 7:41

valikac

28-Apr-02 7:41

Hi.

I implemented a listview in a program. It works great, but not perfect. I have experience problems. First, the listview insert and display new item perfectly the if it was empty before insertion. For example.

// assume listview is empty

-----
CListView &lc = GetListCtrl();

for (int i = 0; i < 10; ++i)
lc.InsertItem(0, "testing");
-----

The code above will insert ten "testing" strings into the listview control. CListView will update the window with the ten items. However, let say that I want to add more items. Here is a technique I use.

-----
CListView &lc = GetListCtrl();
lc.DeleteAllItems();

int i;
for (i = 0; i < 10; ++i)
lc.InsertItem(i, "testing");

// inserting new lines

for (int j = i; i < 20; ++j)
lc.InsertItem(j, "new items");

Okay. The code above should work. However, sometimes CListView will not display the updated data. Again, in the example above, the program will not update the window with "new items." This seems to happen when I start to add a lot of items (100 or more). Is there some kind of a limit on the CListCtrl?

What is the proper way to add, remove, and clear a CListCtrl *and* properly redraw everything correctly?

Thanks,
Kuphryn

Re: CListView & Appending Items :: MFC

l a u r e n28-Apr-02 12:30

l a u r e n

28-Apr-02 12:30

try doing

lc.UpdateWindow();

at the end of your loop
Smile | :)

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Re: CListView & Appending Items :: MFC

Shog⁹28-Apr-02 12:41

Shog⁹

28-Apr-02 12:41

kuphryn wrote:
// inserting new lines

for (int j = i; i < 20; ++j)
lc.InsertItem(j, "new items");

I'd assume this is a typo, but just in case: you should be comparing j not i to 20:

for (int j=i; j<20; ++j)

--------
all the modern things
have always existed
they've just been waiting
to come out
and multiply
and take over

Björk, The Modern Things

Re: CListView & Appending Items :: MFC

Ravi Bhavnani28-Apr-02 13:01

Ravi Bhavnani

28-Apr-02 13:01

Try this for appending content to your list control:

// inserting new lines
for (int j=lc.GetItemCount(); (j < 20); ++j) {
    lc.InsertItem (j, "A new item");
}

/ravi

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

Re: CListView & Appending Items :: MFC

valikac28-Apr-02 13:13

valikac

28-Apr-02 13:13

Thanks.

The reason it did not update the screen was because the window was focused. The solution is to redraw whenever the window is in focus.

Kuphryn

Re: Solution

valikac28-Apr-02 13:14

valikac

28-Apr-02 13:14

Thanks.

The reason it did not update the screen was because the window was focused. The solution is to redraw whenever the window is in focus.

Kuphryn

New class in dialog program?

28-Apr-02 7:40

I am making a dialog based program with MFC and now I want to make a new class for node-management. But when I try to make one in classwizard it wants me to derive it from another class... but I don't want to. Or which class should I derive it from?

Re: New class in dialog program?

Andres Manggini28-Apr-02 7:59

Andres Manggini

28-Apr-02 7:59

What about right click on the ClassView (TreeView at your left), New Class
and then make sure that the Combo named "Class Type" says Generic Class.

Hope this helps.

Andres Manggini.
Buenos Aires - Argentina.

Win API - Help with sizing windows

ParaSwarm28-Apr-02 7:02

ParaSwarm

28-Apr-02 7:02

Hey...I'm making a program in Win API with <windows.h>...

I'm having a problem where my program will look fine in one resolution, like 800x600, but when I run the program in 640x480 or 1024x768, it's much bigger or smaller than it should be.

Is there some sort of way to get the screen size and size the window according to it? How can I do this? Help would be appreciated =)

Thanks - Dave

Re: Win API - Help with sizing windows

Ravi Bhavnani28-Apr-02 7:18

Ravi Bhavnani

28-Apr-02 7:18

Sure. Do this to get the screen size:

RECT  rectScreen;
VERIFY (GetWindowRect (GetDesktopWindow()), &rectScreen));

RECT  rectScreen;
VERIFY (SystemParametersInfo (SPI_GETWORKAREA, 0, &rectScreen, 0));

/ravi

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

Changing executable icon

28-Apr-02 6:16

Hi,

does anybody know of a way to create a small program (ie what functions to use) that can change the icons of executables, similar to a pared down MicroAngelo or IconChanger? I was looking at BeginResourceUpdate() etc, but they are NT-only. My program copies an executable to another folder with certain settings stored in an INI file; I want the user to be able to choose the icon of the executable, thus I need to change it when it is copied (hope that makes sense). Is there a good way of doing this?
If anybody has any ideas, I would be very grateful.
Many thanks,
Keith

Re: Changing executable icon

Joaquín M López Muñoz28-Apr-02 9:25

Joaquín M López Muñoz

28-Apr-02 9:25

As you pointed out, BeginResourceUpdate and related functions are NT/2k/XP only. Fortunately, Erik Kallen wrote an amazing clone of this set of functions that works for 9x/ME systems as well: see his article Updating Resources on Win9x.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Changing executable icon

28-Apr-02 11:05

Thanks for your reply, I'll check it out.
Cheers,
Keith

*.tli and *.tlh editing

Aviv Halperin28-Apr-02 5:41

Aviv Halperin

28-Apr-02 5:41

I need to edit the compiler created com files

*.tli and *.tlh.

How can I do it? if it isn't posible then do I have to delete and then recreate the object?

thanks,
Aviv.

avivhal

Re: *.tli and *.tlh editing

Tom Archer28-Apr-02 6:10

Tom Archer

28-Apr-02 6:10

You can do this, but it's probably not recommended. Just remove the #import statement after you've compiled the first time as that statement will continually overwrite your modifications. Also, make sure that both files are in the project so that they get compiled and linked.

Cheers,
Tom Archer
Author, Inside C#

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the affairs of others.

Re: *.tli and *.tlh editing

Aviv Halperin28-Apr-02 7:25

Aviv Halperin

28-Apr-02 7:25

Thanks but I couldnt find the #import anywhere in the project nor in the tli , tlh files.

it seems like the compiler ignores my changes completely and reloads the files from somewhere... I don't know where.

Aviv.

avivhal

Re: *.tli and *.tlh editing

Tom Archer28-Apr-02 7:31

Tom Archer

28-Apr-02 7:31

I'm going to need some more info to go on then. What tli and tlh files are you referring to? How did they get added to your project?

As an example of what I'm getting at, if I want to use the C++ wrappers for the ADO 1.5 COM interface, I simply use a #import which automatically creates a tli and tlh file and adds them to my project's build. This #import is typically located in the stdafx.h file.

Cheers,
Tom Archer
Author, Inside C#

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the affairs of others.

edit box stuff

28-Apr-02 5:17

How do you update an edit box that holds an int?
I have asigned an int called m_nNumber to the edit box... then i change it and I would like it to show the change in the edit box

Re: edit box stuff

Tom Archer28-Apr-02 5:18

Tom Archer

28-Apr-02 5:18

Call UpdateData(FALSE)

Cheers,
Tom Archer
Author, Inside C#

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the affairs of others.

Re: edit box stuff

28-Apr-02 5:20

Thanks!I am grateful for people that answers my stupid newbee questions Smile | :)

Re: edit box stuff

Tom Archer28-Apr-02 6:08

Tom Archer

28-Apr-02 6:08

Hey mate. We all started out where you are. Don't even worry about it.

Cheers,
Tom Archer
Author, Inside C#

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the affairs of others.

Re: edit box stuff

Tom Archer28-Apr-02 5:19

Tom Archer

28-Apr-02 5:19

By the way, I'm assuming that m_nNumber is a DDX variable already associated with the control in your DoDataExchange function.

Cheers,
Tom Archer
Author, Inside C#

A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the affairs of others.

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