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HI, in a MFC program.
I use CDC* pDC = GetDC(); get a CDC pointer of screen.
but I need to create a new font, so I use:
HDC hdc = pDC->GetSateHdc();
my question is, after I done the function, I use:
Release(pDC), released the CDC object.
then do I need to release hdc handle? like Release(hdc)?
modified 21-Feb-14 15:43pm.
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Nope, shouldn't have to do that. That should already be handled when you release the object.
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I would like to dynamically create menu items attached to a submenu of a submenu.
I can get access to the first level of submenu using GetSubMenu, but cannot get to the second level probably because this function returns CTempMenu. Both submenus are pop-up, but I must be must be missing something else here.
Here is my test code snippet which asserts on pSubSubMenu
CMenu *pSubMenu,*pSubSubMenu;
int iCount = pMenu->GetMenuItemCount();
if (pMenu != NULL && pMenu->GetMenuItemCount() > 0)
{
pSubMenu = pMenu->GetSubMenu(2);
ASSERT(pSubMenu);
}
pSubSubMenu = pSubMenu->GetSubMenu(0);
ASSERT( pSubSubMenu);
Any suggestions will be as always appreciated.
Cheers
Vaclav
<pre lang="text">Can I get submenu of a submenu? ( MFC VC 6.0)
I woul like to dynamically create menu items attached to a submenu of a submenu.
I can get access to first level of submenu using GetSubMenu, but cannot get to the second level probably because this function returns CTempMenu. Both submenus are pop-up, but I must be must be missing something else here.
Here is the code snippet which asserts on pSubSubMenu
CMenu *pSubMenu,*pSubSubMenu;
int iCount = pMenu->GetMenuItemCount();
if (pMenu != NULL && pMenu->GetMenuItemCount() > 0)
{
pSubMenu = pMenu->GetSubMenu(2);
ASSERT(pSubMenu);
}
pSubSubMenu = pSubMenu->GetSubMenu(0);
ASSERT( pSubSubMenu);
Any suggestions will be as always appreciated.
Cheers
Vaclav
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Hi,
To avoid the temporary handle and CTempMenu you can use CMenu::GetSafeHmenu[^] to get a permanent handle. You would then call CMenu::Attach[^] to attach to a CMenu object and then manipulate the menu.
Best Wishes,
-David Delaune
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I think you can try use GetSubMenu() twice to get submenu of a submenu. 
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Thanks guys,
there is a minor "problem" with building / attaching permanent handle - it is already attached to window as m_hMenu data memeber of CMenu. I tryed to use it with same results - the second level always returns NULL. The strange part is that docs saiz if the popup submenu does not exist it will create it. But even than it returns NULL.
I would like to use that handle to get to next submenu, but I feel I need to look into what message(s) are being posted when the mouse goes over the menu items and try to process those instead.
I also forgot to say that I am using OnInitMenu in main frame which runs only once.
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Here is what works, still not sure why I could not use m_hMenu similar way.
Basically a copy of MFC code.
HMENU hMenu = pSubMenu->GetSafeHmenu();
pSubSubMenu = pSubMenu->FromHandle(hMenu)->GetSubMenu(2);
ASSERT(pSubSubMenu);
Thanks for all the help I got, you guys are great!
Cheers Vaclav
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1. Create a structure Fraction (numerator, denominator). Accept details of n fraction and write a menu driven program to perform the following operations. Write separate functions for different options. Use dynamic memory allocation.
i) Display the largest Fraction.
ii) Display the smallest Fraction.
iii) Sort Fraction.
iv) Display all.
Note: While accepting fractions, store the fractions in the reduced form.
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Please do not post your homework assignments here; no one is going to write it for you.
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Looks interesting. Good luck with your homework.
Veni, vidi, vici.
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To get any kind of help, please post what are all things you've tried or where you stuck with code/logic.
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A Dialog based MFC program, I want to display data on the dialog control.
Situation like:
a general C++ class D,
a dialog class ADlg :CDialog
{
D dObj;
showSth() { drawText(); }
}
now dObj.showResult() {
UINT32 result = XXXYYY;
if ( result == XXXYYYY )
showResultInDialog(result);
}
How can I transfer data to dialog object to display it?
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It depends on what your control actually is (the one that you want to display some data on)... a dialog isn't a control, it's a window. A control would be, for example, an edit box.
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I ａｍ ｗｒｉｔｉｎｇ ｃｏｄｅ ｏｎ ａｎ ＡＲＭ９２０ ｐｌａｔｆｏｒｍ， ｔｈｅ demo program supplied by vendor is a dialog-based MFC program, running on Windows CE.
Now I need to add more functions to the program,but some functions are not related to the dialog, for example, serial communication module.
I think I can create a new class, like class SerialCom{ } ;
and instantiated it in Dlg class.
Ｉ also can just write some C style functions as global functions, and called them in Dlg.function.
I wonder which way has a better efficiency, in space and time.
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Don't worry about performance: since you are using the serial port for communicating with the microcontroller then your application execution time is, in any case, dominated by the I/O operations.
In any case MFC, at this level (that is simple GUI stuff), is about as efficient as the raw C WINAPI code.
Veni, vidi, vici.
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Hi,
v is an array;
in v[f(x)]+=j; will f(x) be evaluated once or twice (one for reading and one for writing)?
I guess once (at least due to optimization) but I'd like to know if C language ensures that it will be once and not twice.
Thanks
Tom
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A good question, and one that yould be tricky to answer under different circumstances*. But for your purposes it's safe to answer that any of the compound assignment statements evaluate the adress of the modified value just once!
*: it would be tricky indeed if f() could modify v! 
GOTOs are a bit like wire coat hangers: they tend to breed in the darkness, such that where there once were few, eventually there are many, and the program's architecture collapses beneath them. (Fran Poretto)
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I'm inclined to think that it took you longer to type your question than it would have to just compile that piece of code and find out.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I must write portable code (x86, ARM etc.....) and I was interested in understanding what C rules exactly say.
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It's going to depend on the particular compiler's implementation (of sequence points).
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
modified 21-Feb-14 9:19am.
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Perhaps, I found out the right answer, form the C99 standard, about compound ass.:
Semantics
3 A compound assignment of the form E1 op= E2 differs from the simple assignment expression E1 = E1 op (E2) only in that the lvalue E1 is evaluated only once.
So E1 is evaluated ONCE
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No that isn't what that means.
E1 appears on both side of the equals. It is referring to whether E1 is evaluated once for the lvalue side and once for the rvalue side. And it says no.
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