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Instead of winsock.h include winsock2.h
#include "winsock2.h"
#include "ws2tcpip.h"
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Hi, Experts,
I'm implementing a shell extension COM dll, to create a Encrypt folder, user can put some file into this folder and excute them.
when user put their file in my folder, I'll encrypt those file, and when user double click the file,
I can hook the open action because I'm in a shell extension, I'll decrypt file to a temp file, then use shell extension to open the decrypt temp file.
Follow is my code, I use a hidden window to perform shellexcute:
HWND hHiddenWnd = CreateWindow(_T("EDIT"), _T(""), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL);
ShellExecute(hHiddenWnd,L"open",wszNewModifiedFilePath,0,0, SW_SHOWNORMAL);
DestroyWindow(hHiddenWnd);
But after user close the file, when user try to delete the file, it will occur this file is "lock by another process" message.
And when I close the explorer, then open explorer again to open my shell extension folder, the the file won't lock.
I think it maybe because, I use shellexcute in shell extension COM dll, and it load by explorer process.
so explorer lock the file.
Please tell me how to solve this problem, Thanks!!
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Within a project work I have to print rich text files from a console program. Did anyone know a solution for this problem and can provide me a sample code or a library to do this or give me a link to an article that helps? It would really help, because I stepped to articles here on the site and since now didn't get the clue.
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can anyone help me out in clearly understanding the concept of COPY CONSTRUCTORS and VIRTUAL DESTRUCTORS. I have gone through lots of books but still i am not much clear as why we go for COPY CONSTRUCTORS and VIRTUAL DESTRUCTORS.
Kindly help me out.
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Virtual destructors have the same meaning of virtual methods.
Those are useful if you use a base class pointer to hold a derived class pointer.
if base class destructor is not virtual :
class A
{
public:
~A() { cout << "Class A destructor"; }
};
class B : public A
{
public:
~B() { cout << "Class B destructor"; }
};
B *Bobj = new B;
A *Aobj = Bobj;
delete Aobj;
Only the A destructor is invoked.
if you make A destructor Virtual, the destructors of derived class and base class (in this order) are invoked.
Copy constructors are used to copy an object, in these cases:
MyClass obj;
MyClass obj2(obj); // Copy constructor invoked
MyClass obj = obj2; // Copy construcotr invoked
obj = obj2, in this case the assignment operator is used ...
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copy constructor have an explicit enough name ! it gets another instance of its class, and duplicate it into "this"...
imagine in one class, you have a pointer to an object. if you make a simple copy, you would duplicate actually the address, ,not the object pointed. a copy constructor allow you to make a deep copy...
virtual destructors is another topic, with no relation with the first one. in a general mean, you tell a destructor to be virtual if you think that you class can be derived.
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Subramaniam s.V. wrote: COPY CONSTRUCTORS
A copy constructor is used to copy the contents of one object to another. A copy constructor unlike the assignment operator is also responsible for creating the object alongwith the initialization.
Ex:
class sample
{
public:
sample()
{
}
sample(sample &s)
{
cout<<"In Copy Constructor:"<<endl;
}
};
void main()
{
="" sample="" s;
="" *s1="s;" copy="" constructor="" is="" called
="" s2(s);="" called="" in="" this="" case="" also
="" s3;
="" s3="s;" overloaded="" assignment="" called
}
="" a="" differs="" from="" an="" operator="" terms="" of="" creation="" object="" alongwith="" the="" initialization="" variable="" class.in="" there="" piece="" meal="" copying="" contents.
when="" we="" are="" using="" creating="" deep="" object.="" create="" shallow="" object.
so="" use="" constructor.
<blockquote="" class="FQ">Subramaniam s.V. wrote: VIRTUAL DESTRUCTORS.
We need virtual destructors to perform memory cleanup from derived class to the base class.
Somethings seem HARD to do, until we know how to do them.
 _AnShUmAn_
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See here[^] and here[^] maybe it is some helpful to you
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Hi all,
I would need to close a pop-up menu when the current session expires automatically in my application.
This pop-up menu is displayed by TrackPopupMenu() when the user presses the right button on a window. On the other hand, when a time-out occurs (OnTimer()) the current session expires, and I would like to close all possible pop-up menus.
Could anyone help me?
Thank you.
Ser.
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seanru wrote: and I would like to close all possible pop-up menus.
May be you can send a WM_LBUTTONDOWN message to the main window.
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Off the top of my head WM_CANCELMODE[^] is the way to go to cancel menus.
Iain.
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Thanks for your answers.
Anyway, I think it doesn't work.
What I need to do also is to 'close' Start Menu when a timer expires in my application, because that application should go to foreground, and Start Menu should disappear.
I tried to send WM_KEYDOWN and WM_LBUTTONDOWN to Windows task bar, but it does not work.
How could I close that Menu??
Thanks.
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Sadly, the start menu is only an imitation menu. It has a load of non-menu features, and varies from one operating system and service pack to another.
About the only thing I can think of is to find the window with the current focus, and send a WM_KEYUP / WM_KEYDOWN with VK_ESCAPE as a parameter.
Iain.
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Hi,
I have a thirdy party OCX. There is a sample VB program which uses "On Error" to trap runtime errors when an OCX method is invoked.
I want to build my application using this OCX and VC++. How do I trap runtime errors ? Do I have to use exception handling ?
Thanks
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Nyarlatotep wrote: Do I have to use exception handling ?
yes
use
try...catch
nave
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Hello,
I'm using a print preview view to present the preview of a report in my program.
Things seem to be ok, but I don't like the default behavior that the view
will turn to empty when user press an Esc key and want to disable it.
How can I get this?
Thanks
Max
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hi all,
as we can insert the text in an rich edit control with
SetWindowText(string) API
but is it possible to insert some character in between the existing string??
i mean if i know the caret position to insert that character and the actual character to insert then can i insert the characterwith this information??
e.g.
if current text in rich edit control is
love is in the air.
and if i want to insert the character after "in" as "in/" so how i can do that??
please let me know if someone know's how to do this!!
Thanks and Regards
Harshal shete
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harsha_1234 wrote: love is in the air.
and if i want to insert the character after "in" as "in/" so how i can do that??
Like this:
You can use CString::Replace() to replace the text.
CString m_str;
m_richedit.GetWindowText(m_str);
m_str.Replace ("in","in/");
m_richedit.SetWindowText (m_str);
Somethings seem HARD to do, until we know how to do them.
 _AnShUmAn_
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yes this is one way but in this way we need to call GetWindowText
and then after changing the text we will say SetWindowText
what i want to do is that
if i have a character and the caret position that is going to tell me where
to insert that character then i will do
SetCaretPos(point)
and now programmatically i want to insert that character ata that position
so how i can achieve that??
and thank's for replying
harshal shete
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harsha_1234 wrote: what i want to do is that if i have a character and the caret position that is going to tell me where to insert that character then i will do
CPoint pt=m_richedit.GetCaretPos ();
int i=m_richedit.CharFromPos (pt);
CHARRANGE chRange;
chRange.cpMin =i;
chRange.cpMax =i;
m_richedit.SetSel (chRange);
m_richedit.ReplaceSel ("/");
I hope this helps and fits your requirement.
-- modified at 5:01 Thursday 14th September, 2006
Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_
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yes thank's anshuman
actually i am doing multilevel undo redo
thanks and regards
Harshal
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Another option is to use CRichEditCtrl::SetSel[^] to set the 'carret' position (in fact, the text which is selecetd in the control, if nStartChar is equal to nEndChar, then, you specify a carret position). You can then use CRichEditCtrl::ReplaceSel[^] to replace the text which is selected (ans thus, insert text also).
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yes this is a good approach
actually i am doing multilevel undo/redo for richedit ctrl(CRichEditCtrl)
and when i searched on codeproject i didn't got any undo redo code for CRichEditCtrl.
so currently i am making dynamic stack in which i am storing the caret position and the character.in OnChar handler.
and i am thinking that when user will say undo i will pop one frame and will insert that character in the rich edit control at that position.
Is it a good approach??
and is there no other API that will just take the character and caret position o insert the character??
Thanks and regards
Harshal shete
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CString m_str;
m_richedit.GetWindowText(m_str);
m_str.Insert( Index, "string to be inserted" );
m_richedit.SetWindowText (m_str);
akt
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