C / C++ / MFC

SetConsoleCtrlHandler does not work in Windows Vista and Windows 7?

9-Jul-09 2:37

1. Both dialogs should use a single port.

An Asynchronous Socket Server and Client[^]

hackcrackvirus9-Jul-09 2:23

hackcrackvirus

9-Jul-09 2:23

Hello,
I have designed a console application in C++. In the application, I am capturing logoff/shutdown events using SetConsoleCtrlHandler() function. The application is working correctly in Windows 2000 - Windows XP but does not work in Windows Vista/7. Please help.

Re: SetConsoleCtrlHandler does not work in Windows Vista and Windows 7?

Stuart Dootson9-Jul-09 13:05

ShellExecute() function opens a blank page

9-Jul-09 13:05

Look at status codes being returned - if it works in 2000 and XP, but not Vista or 7, the obvious suggested answer is 'something to do with security'...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

venera_soft9-Jul-09 1:32

venera_soft

9-Jul-09 1:32

Hi All,
I have a problem. I want to open an .htm file in default browser(firefox), so i use ShellExecute() function.
It opens a blank page. When i put in that directory another file with the same name it opens properly.
So the problem cannot regard to file path. And i have tried another thing: if I drag and drop the .htm file into either ie or firefox, it displays correctly.
The code is here:

std::wstring url = "file:///C:/DOCUME~1/MACADA~1/LOCALS~1/Temp/messages.htm";
std::wstring defaultBrowser = getDefaultBrowser();
ShellExecute(NULL, NULL, defaultBrowser.c_str(), url.c_str(), NULL, SW_SHOWNORMAL);

Anyone has a clue what can be the reason of this problem?
Thanks

«_Superman_»9-Jul-09 1:45

«_Superman_»

9-Jul-09 1:45

Try this -
ShellExecute(NULL, L"open", url.c_str(), NULL, NULL, SW_SHOWNORMAL);

«_Superman_»
I love work. It gives me something to do between weekends.

Jijo.Raj9-Jul-09 1:54

Jijo.Raj

9-Jul-09 1:54

Hi Venera,

Instead of starting default browser, just pass the html file path to ShellExecute(). For instance, for staring microsoft.com,

ShellExecute(NULL, NULL, "www.microsoft.com", 0, NULL, SW_SHOWNORMAL);

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Rajesh R Subramanian9-Jul-09 2:06

Rajesh R Subramanian

9-Jul-09 2:06

venera_soft wrote:
std::wstring defaultBrowser = getDefaultBrowser();

You don't have to worry about finding out the default browser. A call to ShellExecute will do that for you.

venera_soft wrote:
ShellExecute(NULL, NULL, defaultBrowser.c_str(), url.c_str(), NULL, SW_SHOWNORMAL);

You may have to worry more about passing NULL as the verb. Pass _T("open") as the verb and pass the complete URL as the file to be opened.

It is a crappy thing, but it's life -^ Carlo Pallini

venera_soft9-Jul-09 2:20

venera_soft

9-Jul-09 2:20

Thanks for quick reply. Smile | :)

I found that there was an encoding problem.

pointers to class

hrishiS9-Jul-09 1:02

hrishiS

9-Jul-09 1:02

Hi to all,
I have a abstract class
class A
{
public:
void fn()=0;
//other functions
}
one derive class

Now I need to make one more class B, which will derive from A....here I will implement one function of A...and I need to declare a pointer to class B and pass it to a function called fun2().....How to do that?

Please help me out....

-----------------------------
I am a beginner

Adam Roderick J9-Jul-09 1:14

9-Jul-09 1:14

can u please clear the scneario?

hrishiS9-Jul-09 1:26

hrishiS

9-Jul-09 1:26

I have a abstract class
class A
{
public:
void fn1()=0;
//other functions
};

I have another class B

class B : public A
{
void fn1()
{
}
};

in class B I have implement one function of A ie fn1... I need to declare a pointer to class B and pass it to some other function called funMain() in main function.....something like

B *ptr;
funMain(ptr);

My doubt::
Should I write B *ptr or
B *ptr = new B();

-----------------------------
I am a beginner

Adam Roderick J9-Jul-09 1:37

9-Jul-09 1:37

Are meaning about the need of allocation?

if u dont have member variables in class B or class A then you can write
B* ptr = 0;
funMain(ptr);
else
you have use to allocate it
B *ptr = new B();

CPallini9-Jul-09 1:41

CPallini

9-Jul-09 1:41

himangshuS wrote:
B *ptr;
funMain(ptr);

My doubt::
Should I write B *ptr or
B *ptr = new B();

of course you've to initialize the pointer (i.e. create an instance of the class)
and then call the function, for instance:

B * ptr;
ptr = new B();
funMain(ptr);

BTW what has it to do with abstract classes?
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

RAII / RIIA best-practices question about std::vector

«_Superman_»9-Jul-09 1:49

«_Superman_»

9-Jul-09 1:49

himangshuS wrote:
void fn()=0;

This is not allowed without the virtual keyword.
It should be virtual void fn()=0;

«_Superman_»
I love work. It gives me something to do between weekends.

Mike the Red9-Jul-09 0:30

Mike the Red

9-Jul-09 0:30

So one of my (many) recent questions ellicited a link to Resource Acquisition Is Initialization[^]. The wikipedia entry made sense and it seemed like, in general, this structure would be a good idea.

So now I'm using std::vector for the first time since my RAII introduction, and I recall that vector<> leaks unless I call vector<>.clear() when I'm done with the vector.

Does that mean, considering RAII, that whenever I want to use std::vector the best-practice method would be to write a specialized container class that calls .clear() in the destructor and exposes all the std::vector methods?

Now that I think of it, the container could be written as a template class.... but I'm going to let the question stand, since I'm just learning about RAII...

Is this an exception to the rule, or would a container class be best?

A thousand praises to all those who exhibit patience with the noob!

MZR

Re: RAII / RIIA best-practices question about std::vector

Stuart Dootson9-Jul-09 2:06

Re: Fair 'nuff, but, if vector deallocates, can you see why this leaks:

9-Jul-09 2:06

Mike the Red wrote:
I recall that vector<> leaks unless I call vector<>.clear() when I'm done with the vector.

You recall incorrectly Smile | :)

vector deallocates and calls the destructor of each contained object when it's destructed.

Mike the Red wrote:
Does that mean, considering RAII, that whenever I want to use std::vector the best-practice method would be to write a specialized container class that calls .clear() in the destructor and exposes all the std::vector methods?

No - just use vector.

All STL container classes are (minus trivial bugs) intended to have that behaviour, i.e. they destruct the contained elements and deallocate their storage when destructed.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

So, that means....

Mike the Red9-Jul-09 2:23

Mike the Red

9-Jul-09 2:23

That I wasted the last 4 hours trying to stop this from leaking:

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
	vector<char *> vc;
	vc.push_back("test");
	_CrtDumpMemoryLeaks();
	return 0;
}<hr>Detected memory leaks!
Dumping objects ->
c:\program files\microsoft visual studio .net 2003\vc7\include\crtdbg.h(689) : {44} normal block at 0x008A0FF0, 4 bytes long.
 Data: <  C > A0 A5 43 00 
Object dump complete.
The program '[7368] ConTest.exe: Native' has exited with code 0 (0x0).

When all I needed was a $#^$#&-ing pair of braces...

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );
	{
		vector&lt;char *&gt; vc;
		vc.push_back("test");
	}
	_CrtDumpMemoryLeaks();
	return 0;
}

I just love learning curves, don't you?

Thank you for your help, Stuart!

...thanks to you, I wasted 4 hours instead of 5 or 6 Poke tongue | ;-P

Stuart Dootson9-Jul-09 2:25

heh.. beat my edit by 2 minutes ; P       -nt-

9-Jul-09 2:25

Ummmm - the vector hasn't been destructed when you call _CrtDumpMemoryLeaks...
Try this:

#include <iostream>
#include <tchar.h>
#include <vector>

int _tmain(int argc, _TCHAR* argv[])
{
	_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );

	{
		vector<char *> vc;
		vc.push_back("test");
	}

	_CrtDumpMemoryLeaks();

	return 0;
}

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Mike the Red9-Jul-09 2:33

Mike the Red

9-Jul-09 2:33

-nt-

Re: heh.. beat my edit by 2 minutes ; P       -nt-

Stuart Dootson9-Jul-09 2:36

colored tabcontrol for smartphone

9-Jul-09 2:36

Faster than a speeding bullet Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

emre079-Jul-09 0:24

emre07

9-Jul-09 0:24

Hello everybody. I am beginner on smartphone application with MFC. I need to change both text color of a tab control to white and also background of that tab control to black for smartphone application implemented with MFC. How can I do it? Thanks a lot for your help.

How to read 'MODIFY' File/Folder permission

sumd9-Jul-09 0:06

sumd

9-Jul-09 0:06

Hello All,

I have a query regarding File/Folder permissions.

I have a folder on which a particular user don’t have ‘MODIFY’ permission.
I want to read programmatically whether the particular user has the ‘MODIFY’ permission on that folder on not.

Currently I am using following code.

res = _waccess( L"E:\\3D Library\\Temp.txt”, 06 );
Temp.txt is a file in the Folder on which user dont have 'MODIFY' access rights.

This is returning the same value for all users irrespective of the MODIFY permission.
I wanted to use ‘GetFileAttributes(…)’ but I don’t understand how to use it to read ‘MODIFY’ permission.

My query is:
How read the ‘MODIFY’ permission?

Please help.

Thanks,

Re: How to read 'MODIFY' File/Folder permission

Adam Roderick J9-Jul-09 0:42

Re: How to read 'MODIFY' File/Folder permission

9-Jul-09 0:42

To query and set we can use
GetFileAttributes and SetFileAttributes respectively.

dwAttrs = GetFileAttributes(FileData.cFileName);
if (!(dwAttrs & FILE_ATTRIBUTE_READONLY))
{
SetFileAttributes(szNewPath,
dwAttrs | FILE_ATTRIBUTE_READONLY);
}

For user permission on particular folder try this

Check User’s Permissions On A File or Folder[^]

sumd9-Jul-09 2:12

sumd

9-Jul-09 2:12

Thanks For the response.

I can check the read access using this method.
But I want to specifically check the "MODIFY' access.

Is there any way to check the "MODIFY" access.

Thanks...

Re: How to read 'MODIFY' File/Folder permission

Adam Roderick J9-Jul-09 2:45