Declaring a global variable of a template type - C / C++ / MFC Discussion Boards

Re: Problem with slider-control and NM_CUSTOMDRAW

Member 7988338-Jan-04 6:53

8-Jan-04 6:53

Thanks for the article. But I'm looking for a solution with any use of MFC-classes. Does anyone know a solution just using plain Win-API.

Mouse Highlighting

Anthony98878-Jan-04 3:44

Anthony9887

8-Jan-04 3:44

I would like to be able to highlight a section of a graph, very similar to audio programs highlighting a wav pattern by using the mouse. Any ideas?

Thanks

Re: Mouse Highlighting

Maximilien8-Jan-04 4:05

Maximilien

8-Jan-04 4:05

You can draw a rectangle area, the "selection", in XOR; look for CDC::SetRop2.

you also need to handle the mouse down, move and up to start and manage the drawing.

Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )

Help for Toggling toolbar buttons

Ruchit Sharma8-Jan-04 1:29

Ruchit Sharma

8-Jan-04 1:29

Hi
I would like to know how to make a toolbar button toggle. For example, in MDI if there are two child windows and corresponding buttons on the toolbar for them, if the button

is clicked once then the child window should appear and when it is clicked for the second time the child window should dissappear. Please help me regarding this. This is urgent.

Thanking you,
Regards
Ruchit Sharma. R

Help for Toggling toolbar buttons

Ruchit Sharma8-Jan-04 1:29

Ruchit Sharma

8-Jan-04 1:29

Re: Help for Toggling toolbar buttons

Monty²8-Jan-04 1:40

Monty²

8-Jan-04 1:40

Add a Handler for ON_COMMAND_UI (Toolbar Button)

void CMainFrame::OnMY_SNAZZYButton(CCmdUI* pCmdUI)
{
    pCmdUI->SetCheck(..1 for check , 2 for uncheck...);
}

Hope it Helps Smile | :)

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

MDI Problem!

skylonely8-Jan-04 1:25

skylonely

8-Jan-04 1:25

I generated a FormView Dialog in a MDI, I can use a item in Menu to active and display the dialog, however, when I click the MINIMIZEDBOX on the dialog, it will disappear, and I can't find it back ever.

I must say this dialog didn't destroy normally!

What should I do , do you meet with this kind of problem?

Hoping... OMG | :OMG:

Declaring a global variable of a template type

tguzella8-Jan-04 1:21

tguzella

8-Jan-04 1:21

Hi there

I am writing a program to use linked lists using templates, and i am trying to make it as fast as possible, so i am thinking of storing the address of the last inserted item.
Each node of the list if declared as follows:

template <class ItemType>
struct NodeList
{
ItemType *item;
NodeList<ItemType> *next;
}

what i am trying to do is to declare a global variable like

template <class ItemType>
NodeList<ItemType> *last_inserted=NULL;

, but the compiler won't allow me to do that. If instead i declare it as
NodeList<<int>> *last_inserted=NULL, it is ok, but it would work for integers only.

How can I get this to work???

Thanks

Re: Declaring a global variable of a template type

Johnny ²8-Jan-04 5:23

Johnny ²

8-Jan-04 5:23

Have you thought about using the STL to do this? It does exactly what you need, is about as fast as you can get, and most importantly, it works without you needing to re-invent something. An example can be found here[^].

If you really must create your own linked list, then there is no need to use a global (which is a bad thing to do anyway) for the next position. Instead, store it in the class that provides the list operations.

Re: Declaring a global variable of a template type

tguzella11-Jan-04 13:21

tguzella

11-Jan-04 13:21

I wish I could do that, but this is my assignment for my computer science project...
Thanks for the reply.

Thiago Guzella

Create transparent objects

swarnamanoo8-Jan-04 1:00

swarnamanoo

8-Jan-04 1:00

I want to create transparent gdi objects..how is it possible

Re: Create transparent objects

Selvam R8-Jan-04 1:57

Selvam R

8-Jan-04 1:57

Hello,

The following artilce help to Create transparent dialog boxes ,

http://www.codeproject.com/gdi/rgncreator.asp

With Regrds,
R.Selvam

Re: Create transparent objects

Anonymous8-Jan-04 6:17

Anonymous

8-Jan-04 6:17

it's not it is hard i have a teacher teaching me and i still don't no what the f*** to do Mad | :mad:

Saving ColeServerDoc

kevcs28-Jan-04 0:58

kevcs2

8-Jan-04 0:58

Hi all,

Re: Saving ColeServerDoc

Selvam R8-Jan-04 1:53

Selvam R

8-Jan-04 1:53

DirectSound - Window Handle problem

elza8-Jan-04 0:31

elza

8-Jan-04 0:31

I have an UI based application designed using DirectSOund to capture nad playback voice. But teh problem is that it expects the UI window to be on top and on focus always. Presently I am passing the handle to the main UI application so when i minimize it our bring another application on top of this no audio can be heard though capturing takes place.

Presently I am setting DSSCL_PRIORITY in SetCooperativelevel. I have also tried the other levels....NORMAL, etc.

anybody worked on DirectSound ?Any solution to this ??

Re: DirectSound - Window Handle problem

tareqsiraj25-Mar-04 1:53

tareqsiraj

25-Mar-04 1:53

Use DSBCAPS_GLOBALFOCUS in the DSBUFFERDESC structure. Hope this helps

-Tareq

delete [] pCharPointer

utkarsharma8-Jan-04 0:28

utkarsharma

8-Jan-04 0:28

I am face'g proble in the DLL. when I work in Debug mode the code work fine
/////--code is--//////
char* pCharPointer = new char[intLength];
//
//some code
//
pCharPointer = NULL;
delete [] pCharPointer;
///////////
But give error in release mode.....
//////////////////////////////////////////////////////////
If I change the code to
//////--code---/////
char* pCharPointer = new char[intLength];
//
//some code
//
//----pCharPointer = NULL;
delete [] pCharPointer;
///////////
it work's fine in release mode but give error in the debug mode...
It will be a big help if some body can clear WHY????

utkarsh sharma
"Not everything that counts can be counted, and not everything that can be counted counts."

Re: delete [] pCharPointer

Mike Dimmick8-Jan-04 0:48

Mike Dimmick

8-Jan-04 0:48

The first snippet is just wrong - you're overwriting the actual pointer to the memory block, which causes delete[] to simply do nothing in release mode. There's probably an assert in debug mode to tell you that you're trying to delete a null pointer.

If your debug mode is telling you about a problem, you should probably listen. Release mode doesn't do as much checking. Could you be corrupting this pointer somehow?

It would help if you posted the error message(s).

Re: delete [] pCharPointer

John R. Shaw8-Jan-04 4:37

John R. Shaw

8-Jan-04 4:37

I wish to elaborate on what mike said.

char* pCharPointer = new char[intLength]; // pCharPointer now contians an address like 0x50FC3456

pCharPointer = NULL; // pCharPointer now contians 0x00000000

delete [] pCharPointer; // does nothing and is still a valid call

char* pCharPointer = new char[intLength]; // pCharPointer now contians an address like 0x50FC3456

delete [] pCharPointer; // frees/releases memory
delete [] pCharPointer; // error - already free
pCharPointer = NULL; // pCharPointer now contians 0x00000000
delete [] pCharPointer; // does nothing and is still a valid call

INTP

Re: delete [] pCharPointer

Jörgen Sigvardsson8-Jan-04 8:12

Jörgen Sigvardsson

8-Jan-04 8:12

pCharPointer = NULL;
delete [] pCharPointer;

Sir, are you blind? That if anything ought to raise suspicions. Smile | :)

--
If there was a problem, Yo, I'll solve it!
Check out the hook while my DJ revolves it.

Icons on the status area

codevisio8-Jan-04 0:20

codevisio

8-Jan-04 0:20

Hi at all,
is there a way to send messages from an application A to an other
application B?
Application A is mine, application B is not mine. Application B has an icon
in the status bar.
With application A i would like to send messages, like WM_KEYDOWN or right
button click, to appliaction B via its icon on the status bar.
It is possible?

thanks a lot

roberto

Re: Icons on the status area

utkarsharma8-Jan-04 0:47

utkarsharma

8-Jan-04 0:47

hi there ..
there r ways to send info from one application to another Like memory mapped file, DLL hooking ...
for this in the above win95 u can work upon but u need control of both the application in this scenario.
you can refer any Advanced Windows book of Jeffry Richter of Microsoft Press
....
all the best..
.... Sleepy | :zzz:

utkarsh sharma
"Not everything that counts can be counted, and not everything that can be counted counts."

Re: Icons on the status area

Monty²8-Jan-04 1:21

Monty²

8-Jan-04 1:21

roberto674 wrote:
With application A i would like to send messages, like WM_KEYDOWN or right
button click, to appliaction B via its icon on the status bar.

Get the HWND of Application B
and use ..
SendMessage(hWnd_B,WM_KEYDOWN,....);

To Get The HWND of B application USE
FindWindow

Hope it Helps Smile | :)

Live as if your were to die tomorrow. Learn as if you were to live forever.
-Mahatma Gandhi

Re: Icons on the status area

codevisio8-Jan-04 2:40

codevisio

8-Jan-04 2:40

Sure,
but the problem is the HWND from FindWindow is the handle of main application B. If application uses another window associates to at the icon on th status bar? the window that manages messages from mouse (right click and so on)...
the HWND of the main application B cannot be the same the window that do this.

can help me some shell functions for this?
roberto

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