C / C++ / MFC

Re: How to process and update GUI

15-Nov-07 11:38

nrbracke wrote:
Is it possible that this method is not allowing events to be processed by the window/form?

Yes it's possible.

You can, however, force the window to get an immediate WM_PAINT message by invalidating part
or all of the window (see InvalidateRect()/InvaliateRgn()) and calling UpdateWindow().

Also, check out RedrawWindow(), which combines the above mentioned operations.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

nrbracke17-Nov-07 12:44

nrbracke

17-Nov-07 12:44

If I Invalidate() the windows goes blank untill the method finishes its processing instead of updating with the components I have already added. What is preventing the paint method from getting called?

Re: How to process and update GUI

Mark Salsbery17-Nov-07 13:03

How to add menu to CListbox?

17-Nov-07 13:03

You need to call UpdateWindow() as well, so a WM_PAINT message gets sent to
the window. That window would need to actually draw in response to WM_PAINT.

You really should be doing lengthy operations on a separate thread if you want your
UI to stay responsive. By not letting the message loop run, you're preventing the UI
from getting and dispatching the messages it needs.

You could also periodically pump queued messages during your lengthy operation,
something like this:

<span style="color: Green;">// MFC version</span>
MSG msg;
while (::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) 
{ 
    if (!AfxGetApp()-> PumpMessage()) 
    { 
        break; 
    } 
} 


<span style="color: Green;">// Win32 Version</span>
MSG msg;
while(::PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
{
    ::TranslateMessage(&msg);
    ::DispatchMessage(&msg);
}

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Gofur Halmurat15-Nov-07 9:46

15-Nov-07 9:46

Hello,
is there a way to add a popup menu to ClistBox control?
thanks

Mark Salsbery15-Nov-07 10:37

15-Nov-07 10:37

Gofur Halmurat wrote:
s there a way to add a popup menu to ClistBox control?

One way would be derive a class from CListBox and add a WM_CONTEXTMENU handler
to the class. In that handler, use TrackPopupMenu() to show a popup menu.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Gofur Halmurat15-Nov-07 10:59

15-Nov-07 10:59

Hello,

I created a class which derived from CListBox, and I added WM_CONTEXTMENU handler, there is a problem, how can i use TrackPopupMenu()in the class?
I have the menus ID = IDR_MENU1, can i call it in the class? if so, how?

thanks

Mark Salsbery15-Nov-07 11:28

15-Nov-07 11:28

Gofur Halmurat wrote:
I have the menus ID = IDR_MENU1, can i call it in the class? if so, how?

What did you try??

Take a look at TrackPopupMenu() in the PSDK or MSDN.

Here's one example:

CMenu popupmenu;
popupmenu.LoadMenu(IDR_MENU1);
...do some menu initialization if necessary...
int Command = (int)popupmenu.GetSubMenu(0)->TrackPopupMenu(TPM_RIGHTALIGN | TPM_BOTTOMALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_NONOTIFY, point.x, point.y, this);
...process the command...

You can also use an appropriate window and catch the command message the normal MFC way.
You'd have to remove the TPM_RETURNCMD and TPM_NONOTIFY flags.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Gofur Halmurat16-Nov-07 6:18

16-Nov-07 6:18

Hello Mark,
here is what i did in WM_CONTEXTMENU

<br />
popupmenu->LoadMenu(IDR_MENU1);<br />
int Command = (int)popupmenu->TrackPopupMenu(TPM_RIGHTALIGN | TPM_BOTTOMALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_NONOTIFY, point.x, <br />
point.y, this);<br />

when i click on the listbox, appears a bar(like 10x100), does not appear the menu, what do u think about why it doesnt show the menu?

thanks

Mark Salsbery16-Nov-07 6:22

16-Nov-07 6:22

Without seeing your menu resource, I have no idea.

Maybe try the first popup like I showed in my example...

...(int)popupmenu->GetSubMenu(0)->TrackPopupMenu(...

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Mark Salsbery16-Nov-07 6:25

16-Nov-07 6:25

Also make sure you're tracking your menu resources....

You don't necessarily need to load the menu every time you get a WM_CONTEXTMENU
message - you can load it once, maybe in the constructor.

If you do choose to load it every time, make sure you release it Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Gofur Halmurat16-Nov-07 7:01

16-Nov-07 7:01

Hello,
you are right, there should be GetSubMenu(0)->, otherwise, it doesnt work,

It helped me alot

Thanks

Gofur Halmurat17-Nov-07 6:04

17-Nov-07 6:04

Hello,

I have a question again, it shows the popup menu when i click rightbutton, but, how can we create popup menu message?

thanks

Gofur Halmurat17-Nov-07 11:44

17-Nov-07 11:44

Hello,
Finally I understood that it should be like this

	popupmenu->LoadMenu(IDR_POPUP);	<br />
	int Command = (int)popupmenu->GetSubMenu(0)->TrackPopupMenu(TPM_LEFTALIGN | TPM_BOTTOMALIGN | TPM_RIGHTBUTTON | TPM_RETURNCMD | TPM_NONOTIFY, point.x, point.y, this);<br />
	switch(Command)<br />
	{<br />
	case ID_POPUPMENU_EXIT:<br />
		MessageBox("f***ing sh*t");<br />
		break;<br />
}

thanks

Mark Salsbery17-Nov-07 13:05

sort numbers with its index

17-Nov-07 13:05

Hehe...ah, the dreaded "f****ing sh*t" messagebox Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

sarojsigdel15-Nov-07 9:41

sarojsigdel

15-Nov-07 9:41

I want to sort array of data in ascending order associated with index.
for example
data 4 2 3 5
index 0 1 2 3

after sorting the result should be
data 2 3 4 5
index 1 2 0 3

can anybody help me with this problem

sarojsigdel

George L. Jackson15-Nov-07 12:29

15-Nov-07 12:29

This code does not answer your question exactly but it should give an idea on how to do it:

#include <iostream>
#include <vector>
#include <algorithm>
 
using std::wcout;
using std::endl;
using std::vector;
using std::sort;
 
typedef vector<int*> pint_v;
typedef pint_v::iterator pint_i;
 
class SortPtr
{
public:
bool operator()(const int* v1, const int* v2)
{
return *v1 < *v2;
}
};
 
int _tmain(int argc, _TCHAR* argv[])
{
int values[] =
{ 10, 9, 8, 7, 6, 5, 5, 4, 3, 2, 1 };
 
size_t count = sizeof(values)/sizeof(values[0]);
pint_v values_v;
 
for (size_t i = 0; i < count; ++i)
{
values_v.push_back(values + i);
}
 
SortPtr sp;
pint_i begin = values_v.begin();
pint_i end = values_v.end();
 
sort(begin, end, sp);
 
for (pint_i i = begin; i != end; ++i)
{
wcout << values[*i - values] << endl;
}
 
return 0;
}

"We make a living by what we get, we make a life by what we give." --Winston Churchill

George L. Jackson15-Nov-07 13:20

15-Nov-07 13:20

Hmm, I get a 1 rating for my answer that actually sorted the array by its index (well, it was actually using pointer arithmetic. *i + values evaluated to the array index.) without a reason why! Cry | :((

"We make a living by what we get, we make a life by what we give." --Winston Churchill

toxcct15-Nov-07 21:17

toxcct

15-Nov-07 21:17

i think it's because you shouldn't do someone's homework, at least, not entierely. Moreover, you don't even use any of the formating html tags, so your message looks a little ugly...

by the way, it's just my feeling, i don't know the voter's reason though

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

George L. Jackson16-Nov-07 1:07

16-Nov-07 1:07

I appreciate your comments and I have learned something from them. I have been beaten up physically (survived a t-bone auto accident) and mentally (depressed about becoming a senior). Sometimes, I question why I should even attempt to post replies here.

Thanks,
Geo

"We make a living by what we get, we make a life by what we give." --Winston Churchill

toxcct16-Nov-07 1:28

toxcct

16-Nov-07 1:28

George L. Jackson wrote:
Sometimes, I question why I should even attempt to post replies here

i wonder the same sometimes. but if you know your presence here is worth it, then don't care about the low rates, there will always some other ones to pull your messages up. Wink | ;)

keep it up George. i've seen you to be a good member of the Managed C++ forum.
but try to follow the posting guidelines, especially when you post code samples (the <pre></pre> tag is dedicated for that). also, always think about the interrest of the OP. if a student is asking for a code, even though you can write it in a flashlight, would you do it, or try to convince him to listen at his teacher and try himself to do his homework ? one will never learn anything if no effort is supplied...

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

George L. Jackson16-Nov-07 1:42

16-Nov-07 1:42

I get down on myself at times but I usually snap out of it! Any way, Rodney Dangerfield made a career on "no respect".

I did break the tutoring ethics by supplying code rather than supplying informative suggestions. For that, I slap my own hand. Ouch!

I will make an attempt to create beautiful example code. For, if it looks ugly, it may run ugly.

Thus, on this day of becoming a senior, I will bring forth an effort to be a better poster. I feel rejuvenated already! Rose | [Rose]

"We make a living by what we get, we make a life by what we give." --Winston Churchill

George L. Jackson15-Nov-07 16:15

15-Nov-07 16:15

This one is even better. This will work with more types.

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
 
using std::wcout;
using std::endl;
using std::vector;
using std::sort;
using std::less;
 
template <typename It, typename Pred>
class dereference_predicate : public std::binary_function<It, It, bool>
{
public:
 
dereference_predicate() {}
dereference_predicate(const Pred &pred) : pred(pred) {}
 
bool operator()(const It &a, const It &b) const
{
return pred(*a, *b);
}
 
private:
 
Pred pred;
};
 
typedef dereference_predicate<int*, less<int>> pint_less;
typedef vector<int*> pint_vctr;
typedef pint_vctr::iterator pint_iter;
 
int _tmain(int argc, _TCHAR* argv[])
{
int values[] =
{ 4, 2, 3, 5 };
 
size_t count = sizeof(values)/sizeof(values[0]);
 
pint_vctr values_vctr;
 
for (size_t i = 0; i < count; ++i)
{
values_vctr.push_back(values + i);
}
 
pint_iter begin = values_vctr.begin();
pint_iter end = values_vctr.end();
 
less<int> less_than;
pint_less dp(less_than);
 
sort(begin, end, dp);
 
for (pint_iter i = begin; i != end; ++i)
{
size_t index = *i - values;
 
wcout
<< L"values["
<< index
<< L"] = "
<< values[index]
<< endl;
}
 
return 0;
}

"We make a living by what we get, we make a life by what we give." --Winston Churchill