C / C++ / MFC

Re: Rewrite 8-bit bmp image problem

25-Apr-02 22:38

Probaly the easiest way is to reorder the 16-color palette so tat it matches the 4-color one in the critical entries (which probably are the first five), and then do the copying.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

chen25-Apr-02 23:00

chen

25-Apr-02 23:00

Thanks for your reply!

I want to make the original and new bmp image displayed in same way.
So how to change the color data of the original bmp image (because
the pallet have been changed)?

xyz

copy selecting text from any applicaion to my application by hotkey

25-Apr-02 21:59

I open my applicaiton. and do selecting text other application such as notepad then I press my hotkey such as Control+Tab (I'm not using control C, so it isn't using clipboard) and that selecting text is sending to my application. I has to registerhotkey but how shoud I do for sending that selecting text ?

thank you so much.

Extern function template !?

Maxwell Chen25-Apr-02 20:31

Maxwell Chen

25-Apr-02 20:31

I have a problem on extern function templates. The syntax compiles OK, but gets:

error LNK2001: unresolved external symbol "int __cdecl Next(int)" (?Next@@YAHH@Z)

Only function templates cause such problem; general functions like
int MyFunction(void* p)
does not cause such problem.

My VC++ is 6.0 sp5.

Here is the example code...
In the first file main.cpp:

/* *********************** */
////////////
// main.CPP
#include <iostreamᡊe9ac73-238b-46be-991d-0f050c37248dusing namespace std;

template<class T> extern T Next(T val);

void main()
{
int a = Next(3);
cout << "a = " << a << endl;
}

/* *********************** */

In the second file function.cpp

///////////////////
// function.CPP

template<class Tᡊe9ac73-238b-46be-991d-0f050c37248dT Next(T val)
{
return val++;
}

/* ************ */

Maxwell Chen

Re: Extern function template !?

Joaquín M López Muñoz25-Apr-02 20:54

Passing Parameter to hook DLL

25-Apr-02 20:54

As main.cpp does not see the definition of Next, which is hidden in function.cpp, it is required that function.cpp "exports" the instantiation of this template for ints like this:

template<class T>
T Next(T val)
{
return val++;
}
 
template int Next(int); //instantiate Next for ints

This is not a very smart design, as function.cpp has to know in advance for which types Next is going to be used. Usually, it is better to have the definition of all templates inside header files included by the "consumer" .cpps.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Sameer Maggon25-Apr-02 20:20

25-Apr-02 20:20

Hi,
Sorry guys, but how can i pass a parameter to
the dll which i've hooked to the system

Please help
Sameer

Joaquín M López Muñoz25-Apr-02 20:29

25-Apr-02 20:29

Export some function to accept the parameters and have them stored in a data shared segment (if you need help about shared segments, check Phil McGahan's article How to share a data segment in a DLL.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Sameer Maggon25-Apr-02 21:24

25-Apr-02 21:24

hi,
i did this.. and made a function setfilename(char *)
which changes the filename..

but in my DLL mail i am doing fopen.. but now the
file is not being created

#pragma data_seg (".HookSection")
// Shared instance for all processes.
static HHOOK hHook = NULL;
// Change 2
static char szFilename[_MAX_PATH] = "";
// Change 2
#pragma data_seg ()

Joaquín M López Muñoz25-Apr-02 22:34

25-Apr-02 22:34

setfilename does a strcpy to szFilename, right? If so, everything should work fine. Check the following:

Make sure the filename is correctly set by displaying it somehow (say with a MessageBox) right before calling fopen.
Maybe the file is being opened in a directry different to what you expected.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Sameer Maggon25-Apr-02 23:11

Progressbar as Part of Statusbar :: MFC

25-Apr-02 23:11

Actually i had put that code in DLLMain, but now it
is inside HookProc..

Now the problem is that when i run some application,
lot of entries of the same application are logged on
to my log file.. whereas first it was just one

Sameer

valikac25-Apr-02 20:14

25-Apr-02 20:14

Hi.

I would like to implement a progress bar one pane of the statusbar. Current, the statusbar has two panes. Pane 1 (index 0) is the default separator where you see "Ready." The second pane is contains the progressbar. Here is the code.

-----
CRect progressRect;
m_wndStatusBar.GetItemRect(1, &progressRect);
m_ProgressBar.Create(WS_CHILD | WS_VISIBLE | SBPS_NOBORDERS | PBS_SMOOTH, progressRect, this, -1);
m_ProgressBar.SetRange(0, 100);
m_ProgressBar.SetPos(0);
-----

Here is the code that tests the progressbar.

-----
for (int i = 0; i < 100; ++i)
{
{
m_ProgressBar.SetPos(i);
::Sleep(25);
}
}
-----

For some reason, I do not see any sign of the progressbar working. I have an option in the menu to start the for loop. However, I do not see any sign of the progressbar, period. I am using SDI. The code above are all part of main.

Thanks,
Kuphryn

Roger Allen26-Apr-02 1:57

Roger Allen

26-Apr-02 1:57

If your doing this loop in your user interface thread, then its not allowing the messages generated from your loop to be processed. Try adding this into the loop:

MSG msg ;
while (::PeekMessage(&msg, NULL, 0, 0, PM_NOYIELD | PM_REMOVE))
    {
    ::TranslateMessage(&msg) ;
    ::DispatchMessage(&msg) ;
    }

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

valikac26-Apr-02 4:56

26-Apr-02 4:56

Thanks.

Why is it not allowing me to update the progress bar in the UI thread?

Kuphryn

Roger Allen26-Apr-02 5:53

Roger Allen

26-Apr-02 5:53

The UI thread pumps the windows messages that allows you controls to draw themselves. In your original function, you entered a lopp that updtaes the position in the control and then pauses the thread until you want to update it again. As the UI thread is not pumping the message queue in the loop, your controls never update, if effect the UI of your app is stalled until the function completes. You should then find all the messages get processed, and the progress will be shown at 100% complete.

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

valikac26-Apr-02 6:46

26-Apr-02 6:46

Thanks.

I do not see the progressbar anywhere on the statusbar (in main) at all.

A member at Codeguru posted a segment of code he used for a something I am trying to implement. He used CDialogBar and CProgressCtrl.

Here is the link to that thread:

http://www.codeguru.com/cgi-bin/bbs/wt/showpost.pl?Board=vc&Number=367944&page=2&view=collapsed&sb=5

He used some really innovative MFC tools such as the CDialogBar and ShowControlBar() function. I have Jeff Prosise's MFC reference, but I do not remember Prosise mentioning those about those tools.

I had problems getting the code from the link above to run. I got the error "bardlg.cpp" debug error. Maybe you can test it out too.

Kuphryn

Re: I see your point

valikac26-Apr-02 6:53

26-Apr-02 6:53

Oh, I understand now. I receive a response at Gamedev about the UI thread (main frame) not able to update the progress bar. I am not familiar with the reason behind that.

I would like to have the progress bar in a pane of a statusbar. That means I will have to declare the progress bar in main (UI thread) and update it from there. If the UI thread cannot update the progress bar, then is it possible to even have a progress bar in main (UI thread) at all?

Kuphryn

Re: Message Pump

valikac26-Apr-02 16:23

26-Apr-02 16:23

Okay. I finally implemented that progress bar in my program. It works great.

I have a question. A member at Anandtech posted a link to a source code from CodeProject. The author of the progress bar uses the function PeepAndPump(). He uses it to process other messages while the progress bar updates. I do not see that function in MSDN. Is there a similar function in MFC?

Kuphryn

COM - History Extraction

Sameer Maggon25-Apr-02 19:11

Determining Active View :: MFC

25-Apr-02 19:11

Hi,
I am using the COM interface given below for getting
the history of Internet Explorer..

IEnumSTATURL* pIEnumSTATURL = NULL; // Enumerated URLs
UrlHistoryStg2* pUrlHistoryStg2 = NULL;

After getting the history i clear the history using
ClearHistory()\

And i am facing a problem, Sometimes some URLs are not deleted from the history and are there in it...
What may be the cause of this behaviour..
And how to delete them.

Regards
Sameer

valikac25-Apr-02 15:35

Re: Determining Active View :: MFC

25-Apr-02 15:35

Hi.

I can considering to add a new feature to a program I am current working on. I will explain briefly on the program.

I am working on a program that is basically a text editor. it looks and feels almost like Notepad.

I want to add a feature similar that includes a split view. The program will operate using two views. The views are split in horizontally. The top view is the original text. So if the user opens a text file that has "Hello MFC," then the program will always display the original text on the top view. The second view located at the bottom is the modified view. I have a feature in the program where, for example, it will seach a text file and capitalize the first letter of a sentence. Once done, I want to display the modified text in the second view.

I would like to know the best approach for something like that with these key feature:

1) separate and unique saves
--- the user can save *both* files separately. the save features on the menu applies to the original text (top view).

What is the best approach to somehow mark what view the user wants to save? I have two ideas.

1) upon save, the program would save whatever view is *active* (cursor).

2) have a second toolbar for the view #2

I am not sure how to implement either of the above. I tried adding a second toolbar, but the program ignores it (I did not see it).

Thanks,
Kuphryn

Joao Vaz25-Apr-02 18:55

Joao Vaz

25-Apr-02 18:55

You could use the GetDocument of the CView then use the IsModified of the CDocument , to check if the data in document is dirty , note you could use explicitily the SetModifiedFlag of the CDOcument associated with the current View then override the SaveModified function of the CDocument to do the proper action, since the default use a normal prompt to present the user the option of saving the changes.

Cheers,
Joao Vaz
The Most Unhappy and Frustrated TCL programmer,besides that a Happy guy

Re: Determining Active View :: MFC

valikac25-Apr-02 19:35