C / C++ / MFC

12-Feb-05 17:56

Hi.
I have a thread that adds values to a vector variable in a class. also main program reads same thread an to display data in it. I havn't used critical section or other sync methods but program works ok, is it necessary to use critical section ?
thanks.

Anonymous12-Feb-05 18:11

12-Feb-05 18:11

main program reads same vector variable not thread.

Mohammad A Gdeisat13-Feb-05 5:59

Mohammad A Gdeisat

13-Feb-05 5:59

Hi,

Because u r using multi-threading application you SHOULD sync ur work using critical sections, events, semaphores,...

your program runs well now, but when the thread writes to the variable at the same time as the main thread reads it, the value read by the main thread will be out-of-date, it is not the current value of the variable.

Furthermore, if you don't use the keyword volatitle in declaring shared variables, the compiler may perform wrong optimizations to speed the code up, and you may get wrong results.

-Always take the safest way

Regards,
Mohammad Gdeisat

Anonymous13-Feb-05 6:31

13-Feb-05 6:31

thank you Mohammad

Problem with public variables

digwizfox17-Feb-05 7:35

digwizfox

17-Feb-05 7:35

Another concern is a possible program crash. When vectors are changed, all iterators are invalidated. So if the main function has an interator and is in the process of reading the data, the thread could interrupt and add something to the vector. Now the main function has an invalid iterator. The problem with not using synch methods is that the errors may not be noticed for months. You could think all is well and then one day, your program crashes while doing the same thing it's been doing all along.

Shawn

browser history

jonavon blakly12-Feb-05 17:24

jonavon blakly

12-Feb-05 17:24

i need to be able to delete the browser history. also it would be a big help to be able to delete temporary internet files. thanks

Re: browser history

Spiritofamerica12-Feb-05 20:08

Spiritofamerica

12-Feb-05 20:08

deleteurlcacheentry is a function, use it.
however you need to know the exact url that you want to delete

hope this helps you

peace

jw8112-Feb-05 16:51

jw81

12-Feb-05 16:51

I declared a variable through ClassView>Add Member Variable in my Cview.

I included header in my MainFrm.cpp.

How to use the variable because it doesnt recognise my variable. Do I need to make an object inside my MainFrm.cpp?

I tried to use

CProgView cview;
cview.myvariable;

but it says cannot access protected member declared in class.

Thanks

Re: Problem with public variables

bmzhao12-Feb-05 21:48

bmzhao

12-Feb-05 21:48

Add Member Variable with 'public',not 'protect', than you can access it.

Re: Problem with public variables

jw8112-Feb-05 23:39

jw81

12-Feb-05 23:39

It is public variable from CView. I use it in CDoc, how to declare it? THanks

Re: Problem with public variables

jw8115-Feb-05 15:28

jw81

15-Feb-05 15:28

Thx Astham

There are 3 kinds of member variables/functions:

public:
Can be used/called by objects of any class

private:
Can be used by objects of this class only

protected:
Can be used by objects of this class and derived classes only.

So if you want to use the variable from somewhere else than a CProgView member
function, you need to make the variable public. If you use Add Member Variable
there's three radio buttons at the bottom of the dialog. Or you could just write
public: at the line before the variable declaration.

THis is my header code,

// Implementation
public:
   float pointX[100];
   float pointY[100];
   virtual ~CMyProgView();
#ifdef _DEBUG
   virtual void AssertValid() const;
   virtual void Dump(CDumpContext& dc) const;
#endif

]

This is my public variable declaration. Why cant I use it?

How to use it from my CMyProgDoc? I have #include CMyProgView.h and use it such as below:

CMyProgView obView;
obView.pointX[i] = something;

How to show pop up menu

Yulianto.12-Feb-05 16:38

Yulianto.

12-Feb-05 16:38

When you right click a RichEdit Control.

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Determining Local Group Permissions

jabroney12-Feb-05 11:53

jabroney

12-Feb-05 11:53

Does anyone know how to find a local group's permissions? I am enumerating through the local groups on my machine using the NetLocalGroupEnum API, but when I check the group using the NetLocalGroupGetInfo API, I only get two pieces of information that I don't need:

1 The group's name - already have, don't need again
2 The group's description - doesn't serve my purpose

Are there any APIs or methods that I can use to find if a local group is an admin group? I've spent many many hours working on this problem and I am getting a little frustrated.

record + playback calls to a dll

Paul Buchmeier12-Feb-05 11:17

12-Feb-05 11:17

Hi, in my VC7 app, I would like to record calls to a dll that I have made using my GUI part and be able to play them back if I need the same sequence again. Any suggestions on how to start, where to look?

Paul

key combination

Spiritofamerica12-Feb-05 11:08

Spiritofamerica

12-Feb-05 11:08

hello
how do I send a key combination to a window like for example ctrl+c. I have tryed with keybd_event and SendInput but I could not send more than one key. Is there a way to send a key combination to a window?
thank you

Re: key combination

Hamed Musavi12-Feb-05 11:19

Hamed Musavi

12-Feb-05 11:19

Hello!
I had such a problem a year ago,
I didn't find a good answer so I decided
to 'Put a hidden BUTTON on the dialog' and use '&' to give it a shortcut to a On... Message.
It solved my problem temporarily! but it's not a good way I think.
But I'm a begginer yet.(I started VC++ about a year ago).

Re: key combination

Anonymous14-Feb-05 2:03

get the path of a file at runtime

14-Feb-05 2:03

I fixed it

Paul Buchmeier12-Feb-05 10:49

12-Feb-05 10:49

Hi, in the code of dll, I need to extract the full path of a file at runtime. Any suggestions? Smile | :)

paul

Hamed Musavi12-Feb-05 11:14

Hamed Musavi

12-Feb-05 11:14

Hello!
Perhaps this will solve your problem:

FILE *fp;
CString fileName,s;

GetModuleFileName(NULL,s.GetBuffer(512),512);
s.ReleaseBuffer();
//remove executable file name
s.Delete(s.ReverseFind('\\'),s.GetLength()-s.ReverseFind('\\'));
fileName=s;
fileName+="\\File Name In Your Project Folder (for example)";
OK?;)

Paul Buchmeier12-Feb-05 11:33

12-Feb-05 11:33

Unfortunately not, since the path of the .exe is unknown (the dll who should determine the path is called thru COM)
Anyways, thanks for your answer!

Paul

Hamed Musavi12-Feb-05 11:46

Hamed Musavi

12-Feb-05 11:46

I'm sorry.
I know almost nothing about COM and it's problem.
I'm a begginer yet Smile | :)

ThatsAlok12-Feb-05 15:27

ThatsAlok

12-Feb-05 15:27

HI Mr Paul!

you have to write following code in your DllMain of DLL (wither Com or simple)

For Getting the path of DLL

   DllMain<code>(HINSTANCE hInst</code>,...)
{
.......
case  DLL_PROCESS_ATTACH:
    char szfileName[MAX_PATH];
    ///this will give you pathof DLL
    GetModuleFileName(<code>hInst</code>,szfileName,MAX_PATH);

   //Now Split the  path to get actual Dir path
   char szDriveName[3];
   char szDirectoryName[MAX_PATH];

   ///Split the path
   _tsplitpath(szfilename,szDriveName,szDirectoryName,NULL,NULL);

   //now your are ready for directory
   sprintf(szfileName,"%s%s",szDriveName,szDirectoryName);
   //now the <code>szfileName </code>contain the directory path
   
}

For Getting path OF Application calling your DLL

--Just change GetModuleFileName api first Parameter from hInst to NULL, and proceed in same way.

"I Think this Will Help"
[Vote One Here,.....]
<h5
alok="" gupta="" <br=""> visit me at http://www.thisisalok.tk

Paul Buchmeier14-Feb-05 3:16