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i suppose there will be "ping, pong" packets to ensure the client is still alive!
Don't try it, just do it! 
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If TCP connection goes down, your implementation will notice you (FD_CLOSE). But the timeouts are very long if e.g. the network cable was just disconnected, you prolly want to test on your own.
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Hi
Can anybody help me? I have a https-file on a server in the internet and want to get the file.
The adress look like:
https://ss004.ak.se/http://ss005.ak...productLogo.gif
This is not the right adress is only a example.
I managed to get a CInternetSession pointer and with that I made a GetHttpConnection to get a pointer to CHttpConnection. With that pointer I know I need to make a OpenRequest() but from that point on I have no clue what to write next.
What do I have to do for that???
Thanks
D
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Hi ,
i have also done the same thing once but using Wininet APIS
i can guide u how to use them.
To use the HTTP WinInet functions
Call the InternetOpen function to initialize an Internet handle.
InternetOpen creates the root HINTERNET handle used to establish the HTTP session. The HINTERNET is used by all subsequent functions.
Call InternetConnect using the HINTERNET returned by InternetOpen to create an HTTP session.
When calling InternetConnect, specify INTERNET_DEFAULT_HTTP for the nServerPort parameter and INTERNET_SERVICE_HTTP for the dwService parameter.
InternetConnect uses the handle returned by InternetOpen to create a specific HTTP session. InternetConnect initializes an HTTP session for the specified site, using the arguments passed to it and creates HINTERNET that is a branch off the root handle. InternetConnect does not attempt to access or establish a connection to the specified site.
Call HttpOpenRequest to open an HTTP request handle.
HttpOpenRequest uses the handle created by InternetConnect to establish a connection to the specified site.
Call HttpSendRequest using the handle created by the HttpOpenRequest to send an HTTP request to the HTTP server.
Call InternetReadFile to download data.
–Or–
Call InternetQueryDataAvailable to query how much data is available to be read by a subsequent call to InternetReadFile.
Call InternetCloseHandle to close the handle created by HttpOpenRequest.
Call InternetCloseHandle to close the HTTP session created by InternetConnect.
Call InternetCloseHandle to close the handle created by InternetOpen.
in this way u can download ur file 
Abhishek Srivastava
Software Engineer (VC++)
India ,Noida
Mobile no 9891492921
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I did that too but it works only with http files if I am not wrong. It doesn't work with https web pages !
The problem is how to handle the SSL.
How can that be done in C++ ?
Especially if it is a page that need a login
Thank you very much for any answer !
Marcello
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You could maybe use URLDownloadToCacheFile.
The word of the day is legs, let's go back to my house and spread the word 
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hi !
I have a control derived from CWnd and I create an instance of it on a dialog.
The problem is that the control does not get the keyboard focus when I click
on it. What am I missing ?
Thanks.
PS:I work with VC 5.
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I dunno, theres alot you could have done if your control is derived from CWnd.
Maybe make sure that your control inside your dialog resource has tab stop checked?
The word of the day is legs, let's go back to my house and spread the word
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did you create the control with enabled bit set.
I Touched Osama Bin Ladens Bushy Beard
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Hello !
I want to have a check box in front of each data in the list box that enable the user to select the datas he wants. Is this functionnality in the CListBox or do I need to subclass the control ?
Thanks
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Try to use CListCtrl instead.
In Report View it can handle check box-es on the first column automatically.
Set extented style to LVS_EX_CHECKBOXES.
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Ok, thanks
I'll try this
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A CListBox is a list of string items.
That having said, if you want to have check box buttons instead of string items, then the best way would be to derive a new class from the CListBox and override the DrawItem member function. This function is safe to use: by selecting a certain type of return value, you can tell Windows what type of drawing you did. For example, if draw it completely yourself, then windows doesn't need to draw it anymore. If you don't want to draw a particular cell, you can let Windows do it.
Here is a CodeProject link to help you get started: Michael Dunn's article[^]
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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I would poke around the Visual C++ section under comboboxes and listboxes someone has probably already written such a control.
Cheers
The word of the day is legs, let's go back to my house and spread the word
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hi!,
i have put a CTreeCtrl in my view class,
i create it on my View::OnCreate and insert some items in
my View::OnInitialUpdate().
i would like to handle messages when i click on treeCtrl items
but how will achieve this?
should i subclass this treeCtrl or is there another way?
what will i do for the future controls user actions.(like Buttons, Edits...)?
thanks for ur help,,,
atilla.
just listening to you...
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You can capture notification events (WM_NOTIFY) from the tree control in your parent window class's message map.
The implementation of the message map entry is as follows:
ON_NOTIFY( <notification message>, <control ID>, <member fxn> ) The above is a message-map entry in the parent window's message map which owns the tree control.
You then declare a member function member fxn that handles the notification message.
For more information about notifications and how they work, visit this link on the MSDN site.
For a list of notification messages sent by a tree control, see this site, again on the MSDN.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Hi !
The project I'm working on is being made with Visual Studio 6. I used to have my project on a specific location on my disk, and some weeks ago, I changed the location.
We are using CVS as the soruce control.
I have the following problem with some classes : if I try to add a new method, I get this error message :
D:\Work\sylvie\src\Utilities\JSUtility.cpp(579) : error C2039: 'applyTransformationToList' : is not a member of 'JSUtility'
c:\scripts\sylvie\src\utilities\jsutility.h(45) : see declaration of 'JSUtility'
As you can see, instead of looking at the header file of JSUtility in D:\Work\sylvie\src\Utilities, the compiler looks at c:\scripts\sylvie etc...
This is an old location. To get rid of this message, the only way I found is to do a 'rebuild all' of the project.
I tried to look in the .dsp and .dsw files if this old location was still written somewhere but didn't find anything !
Have you got an idea on what's going on and how I could solve this problem ?
Thanks for your help !
Jerome
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This information is kept in precompiler header file (.pch). Rebuild All helps because it removes this file.
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I'm not generally known as a stupid guy, but I'm really confused by this. I've been programming for 25+ years, but I've only recently tried to add C++ to my list of proficiencies, and I'm embarrassed to ask, but I'm going to anyway.
I see code that uses the . operator to reference member functions as often as I see the -> operator used for what appears to me to be the same purpose. What the heck is the difference? Can someone explain to me, without the utterly useless Microsoft technical babble, what the difference in usage is? I know it's trivial to you experts, but I have a (hopefully) temporary blind spot that is blocking me from progressing on my journey of discovery on the path of C++ enlightenment.
Please use small words appropriate to my small understanding for your reply... And, Thank you, for helping me to overcome this silly mental block. I'm usually good at spotting patterns, but this one has me stumped.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
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The . operator is for non-dynamic variables. The -> operator is used for pointer variables.
I think you know what a pointer is, don´t you?
"Have no fear, the saint is here!"
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well the . and the -> actually do the same thing they server the same purpose but the difference is that the '.' (dot operator) is used when are dealing with a NORMAL object while the -> operator is used for a POINTER object like check this little snippet below
class foo
{
public :
int i;
};
when making an object of this class
foo myobject;
myobject.i = 0; //this is the normal way to access the i variable
now look at this object
foo *pobject; //now this is a pointer to object
pobject->i = 1; //this is way i will be accessed
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ok
small words? you got em
// a header file
class A
{
public:
A();
~A();
void foo();
};
// a source file
int main(int, char**)
{
A a_object;
A* a_[ointer_to_the_object = new A();
a_object.foo();
a_pointer_to_the_object->foo();
return 0;
}
you see? when you deal with a pointer - you use -> operator......
debug - is my life style
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Roger Wright wrote:
see code that uses the . operator to reference member functions as often as I see the -> operator used for what appears to me to be the same purpose. What the heck is the difference?
To the best of MY understanding
The member selection operator -> is used whenever the expression before is coupled with an indirection operator *
CMyObject myObj;
myObj.Test();
CMyObject* myObj;
myObj->Test();
You can acheive the same thing using
CMyObject myObj;
(*myObj).Test();
Basically when you use -> or *. are accessing members indirectly with a pointer.
The word of the day is legs, let's go back to my house and spread the word
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Thank you for the only marginally comprehensible answer of the lot. Frankly, pointers drive me over the edge, and make me long for the resurgence of Pascal, the only language that's made any sense in the past 20 years or so. Indirection was handy in the ASM days, and I loved using it. But it seems an absurd layer of obscurity when applied to modern languages. I really hate that part of C++.
"Another day done - All targets met; all systems fully operational; all customers satisfied; all staff keen and well motivated; all pigs fed and ready to fly" - Jennie A.
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