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ns wrote:
So a new done my other way with () is legal?
Yes, although it means an entirely different thing. This allocates one char and initializes it:
char* pch = new char ('a');Since chars and ints are interchangeable to a degree, you can stick a number less than 255 in place of 'a' above.
--Mike--
Just released - RightClick-Encrypt v1.3 - Adds fast & easy file encryption to Explorer
My really out-of-date homepage
Sonork-100.19012 Acid_Helm
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Great! Thanks for the explanation. Appreciate it!
ns.
Wonder why the release exe didnt crash.
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One bit of advice: why on Earth are you bugging yourself with new/delete when you're already using CString? Instead of new/strcpy just declare a CString and assign your text.
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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Hi!
I have a dialog based app. I have a bunch of child dialog in my main dialog which I keep showing and hiding based on a few user actions. I need to know when these child dialogs loose focus. I tried WM_KILLFOCUS, WM_ACTIVEATE, but for some reason neither of these messages get sent to my child dialog or even my main dialog for that matter. Does anybody have any suggestions on how I could fix this or maybe get around it?
Thanks,
NC
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How are you showing your child dialogs? Are you using DoModal() (modal dialogs) or Create() with ShowWindow() (modeless dialogs)?
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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Hi!
I am doing a create() and ShowWindow(). They are modeless dialogs.
Thanks
NC
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WM_ACTIVATE is the message you want to handle. It is sent to the window being activated, then to the window being deactivated.
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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Hi!
I tried WM_ACTIVATE too. But for some reason, that doesn't get sent when activating the dialog or even when deactivating the dialog.
One more quick question regarding this - if the focus is on one of the controls on the dialog and if the focus is moved to another dialog altogether, will the original dialog which looses the focus still get the WM_ACTIVATE msg even though the focus was on one of the controls and not really on dialg. I am thinking that this is what is happening in my case since I am not getting the msg.
Thanks,
NC
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I mean, an easy way, like:
<br />
bool isConnected = IsConnected(mySocket);<br />
Or maybe with the select() function?
Michel
It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.
- TreeBeard
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Hello, the codegurus around the world.;)
At CAsynSocket, OnConnect member function will return the error code
called "WSAEISCONN The socket is already connected".
So, you can call Connection function by some interval time, and
check if OnConnect will return this error code.
Please, don't send me your email about your questions directly.
Have a nice day!
Sonork - 100.10571:vcdeveloper 
-Masaaki Onishi-
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Hi
I started 2 processes in my app. and now every one second i want to see if these processes are still running. Coud anyone please tell me how i can get the status of a process to see whether it is running or has been terminated?
thanks
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tcuong wrote:
now every one second i want to see if these processes are still running
Why 'every one second'? Can't you create a thread which waits for process termination with WaitForSingleObject, then posts a message?
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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First i create 5 process namely notepad.exe . Then i have to monitor that how many of these processes are running every 1 second. I've attempted many ways to do it but i failed. This is how i did it.
<br />
void main()<br />
{<br />
STARTUPINFO startUpInfo[5];<br />
PROCESS_INFORMATION proInfo[5];<br />
BOOL success;<br />
HANDLE proHandle[5];<br />
INT i;<br />
INT runningProcess = 5;<br />
CHAR appName[100];<br />
<br />
<br />
<br />
<br />
strcpy(appName, "c:\\windows\\notepad.exe");<br />
<br />
<br />
<br />
<br />
for(i = 0; i <5; i++)<br />
GetStartupInfo(&startUpInfo[i]);<br />
<br />
<br />
for(i = 0; i < 5; i++)<br />
{<br />
success = CreateProcess(appName, 0, 0, 0, FALSE, 0, 0,0,&startUpInfo[i], &proInfo[i]);<br />
<br />
if(!success)<br />
cout <<" Error creating process: "<< GetLastError() <<endl;<br />
<br />
cout << "The process ID is " << proInfo[i].dwProcessId << endl;<br />
}<br />
<br />
for(i = 0; i <5; i++)<br />
{<br />
proHandle[i] = proInfo[i].hProcess;<br />
}<br />
<br />
while (WaitForMultipleObjects(5, proHandle, TRUE, 1000) == WAIT_TIMEOUT)<br />
{<br />
for(i = 0; i < 5; i++)<br />
{<br />
if(proInfo[i].hProcess == NULL)<br />
runningProcess--;<br />
<br />
}<br />
<br />
<br />
printf(" %d ", runningProcess); <br />
I know that this code may look silly to some of you but instead of laughing, please guide me to the right direction. Thanks
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tcuong wrote:
instead of laughing, please guide me to the right direction.
Nobody laughs at you. Seriously.
If you insist on using WaitForMultipleObjects:
- proInfo[i] will not be set to NULL when process terminates
- setting 3rd argument to TRUE causes WaitForMultipleObjects to exit only if timeout occured or *all* processes have terminated. This is obviously not what you're looking for.
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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tcuong wrote:
while (WaitForMultipleObjects(5, proHandle, TRUE, 1000) == WAIT_TIMEOUT)
{
for(i = 0; i < 5; i++)
{
if(proInfo[i].hProcess == NULL)
runningProcess--;
}
printf(" %d ", runningProcess);
}
This code looks neither silly nor anybody wants to laugh on you, really!
First I thought the problem is the TRUE parameter for bWaitAll in your call to WaitForMultipleObjects(), (which is a common mistake) but then I realized that you want to loop until all handles reached signaled state (a process or thread handle becomes signaled if it terminates). Quite clever!
Your problem is, that a signaled handle is not set to NULL, it is still present. Therfore your process counter is never decremented. If you change the line
if(proInfo[i].hProcess == NULL)
runningProcess--;
to
if( WaitForSingleObject( proInfo[i].hProcess, 0 ) == WAIT_OBJECT_0 )
runningProcess--;
it should work. (Note that I just wrote the above from scratch and did not test it  )
However, your description intents that you want to check the status exactly every 1 second. The above checks it at least every 1 second. This is because the WaitForMultipleObjects() returns if either a handle becomes signaled or the timeout elapsed. Of course, this is a negligible detail in almost any case, but hey, you wrote you want to learn how to solve it with Win32 API 
One idea is to use Sleep() instead of WaitForMultipleObjects():
while ( runningProcess > 0)
{
for(i = 0; i < 5; i++)
{
if( WaitForSingleObject( proInfo[i].hProcess, 0 ) == WAIT_OBJECT_0 )
runningProcess--;
}
printf(" %d ", runningProcess);
Sleep( 1000 );
}
BTW: If you bracket your code postings to the forum with <pre> and </pre> tags, the formatting will survive. This would makes it much more comfortable to read it.
--
Daniel Lohmann
http://www.losoft.de
(Hey, this page is worth looking! You can find some free and handy NT tools there )
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Daniel! This is a big help! I really appreciate it! Thank you very much!
Best Regard
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Hi Daniel! I've got it. I just post it up here to let you know that with your help. FULL credit to you!!! 
BOOL flag[5];
for(i = 0; i < 5; i++)
flag[i] = true;
while (WaitForMultipleObjects(5, proHandle, TRUE, 1000) == WAIT_TIMEOUT)
{
if( WaitForSingleObject( proInfo[0].hProcess, 0 ) == WAIT_OBJECT_0 && flag[0] == true)
{
runningProcess--;
flag[0] = false;
}
if( WaitForSingleObject( proInfo[1].hProcess, 0 ) == WAIT_OBJECT_0 && flag[1] == true)
{
runningProcess--;
flag[1] = false;
}
if( WaitForSingleObject( proInfo[2].hProcess, 0 ) == WAIT_OBJECT_0 && flag[2] == true)
{
runningProcess--;
flag[2] = false;
}
if( WaitForSingleObject( proInfo[3].hProcess, 0 ) == WAIT_OBJECT_0 && flag[3] == true)
{
runningProcess--;
flag[3] = false;
}
if( WaitForSingleObject( proInfo[4].hProcess, 0 ) == WAIT_OBJECT_0 && flag[4] == true)
{
runningProcess--;
flag[4] = false;
}
printf(" %d ", runningProcess);
}
This might look lengthy and messy for a moment but i think i can tight it in a loop!! Thanks!!!!
Also thanks to Tomasz !! I greatly appreciate it!!!
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And this is the code after i've shortened it!!!
while (WaitForMultipleObjects(5, proHandle, TRUE, 1000) == WAIT_TIMEOUT)
{
for(i = 0; i< 5; i++)
{
if( WaitForSingleObject( proInfo[i].hProcess, 0 ) == WAIT_OBJECT_0 && flag[i] == true)
{
runningProcess--;
flag[i] = false;
}
}
printf(" %d ", runningProcess);
}
Thanks for the tips Daniel (remember the pre tag)
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Could someone give me a clear definition of serialization. The way I see it is that it is a method to transfer data from memory to file. I may be completely wrong here and I would really like to know the correct meaning. Thanks.
Nick Parker
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Nick Parker wrote:
The way I see it is that it is a method to transfer data from memory to file.
'From' side: usually, you have an 'object graph' - objects related to each other (parent/child relationships, etc). You need to 'flatten' this structure somehow, because you'll need a serial stream of bytes. See 'To' side.
'To' side: not necessarily file. Just sequential stream of bytes - it may be file, network, another memory location, telepatic transceiver or whatever.
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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Ok, I think I understand what you are saying. This provides a method to transport the data (generically speaking) from point A to point B, is that correct?
Tomasz Sowinski wrote:
'From' side: usually, you have an 'object graph' - objects related to each other (parent/child relationships, etc). You need to 'flatten' this structure somehow, because you'll need a serial stream of bytes. See 'To' side.
Could you explain this a little more?
Nick Parker
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I'm assuming that you want me to explain the 'object graph' thing.
Imagine that you have CDocument derived class. It usually contains some data. They may be integers, strings, arrays etc. Serializing them is easy - you're just writing/reading their binary representation.
Now - what happens when you have a pointer in your document? What if it points to an object which has a 'backpointer' to document? These objects connected together are called 'object graph'. Any serialization mechanism must be ready to deal with such situation. Two most important points are:
- you may have polymorphic objects and pointers of type 'CYourBaseObject *'. But pointers point to CYourConcreteType1 or CYetAnotherTypeDerivedFromYourBaseObject. On the deserialization side, you want the real type to be preserved.
- you may more than one pointer to the same object. Both sides of operation must be smart enough to serialize object data only once.
Luckily, as an user of MFC or .NET, you don't need to worry about such issues.
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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This is a flow chart of me trying to follow what you just said:
Tomasz Sowinski wrote:
Imagine that you have CDocument derived class. It usually contains some data. They may be integers, strings, arrays etc. Serializing them is easy - you're just writing/reading their binary representation.
Understood.
Tomasz Sowinski wrote:
Now - what happens when you have a pointer in your document?
Starting to get lost... 
Tomasz Sowinski wrote:
What if it points to an object which has a 'backpointer' to document?
Fully lost now. 
Tomasz Sowinski wrote:
These objects connected together are called 'object graph'.
Okay.
Tomasz Sowinski wrote:
Luckily, as an user of MFC or .NET, you don't need to worry about such issues.
Thank goodness, I thought I was going to have to be lost again.
Nick Parker
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Nick Parker wrote:
Now - what happens when you have a pointer in your document?
Starting to get lost...
Quick example:
You have MFC doc/view app. Your doc class is CWidgetDoc. You've defined a CWidget class, which is a base for CBlueWidget, CTriangleWidget and CStereoWidget.
CWidget class has the following member variable:
CWidgetDoc *m_pParentDoc;
In your CWidgetDoc, you store unlimited number of widgets. You're using std::vector for that:
std::vector<CWidget *> m_widgets;
Your users work with the app and create blue/triangle/stereo widgets. m_widgets grows and contains pointers to different types of objects; all they have in common is the base class, CWidget.
There are pointers going from document to widget. There are pointers going from widgets to document. This is simple object graph - with complicated program, you'd have more tangled structure.
Tomasz Sowinski -- http://www.shooltz.com
Never argue with an idiot, he'll bring you to his level and beat you with experience.
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Tomasz Sowinski wrote:
There are pointers going from document to widget. There are pointers going from widgets to document. This is simple object graph - with complicated program, you'd have more tangled structure.
Gotcha, thanks Tomasz 
Nick Parker
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