Weired problem in using std library - C / C++ / MFC Discussion Boards

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Re: SOS!!!

9-Jul-01 23:57

Thanks.
and How to convert CString to LPBYTE?? Eek! | :eek:

Re: SOS!!!

coder847210-Jul-01 0:30

coder8472

10-Jul-01 0:30

CString strTest;
LPBYTE pBuffer;

pBuffer = (LPBYTE) strTest.LockBuffer();

Confused | :confused:

maXallion
"Look for bugs, I hate bugs!" - Warden, The Mummy
www.maxallion.de - coded evil & more

Mouse moving

9-Jul-01 22:42

Hi,

Can you help me ?
How can do programm which receive messages when user move with mouse out of window.

LB

Re: Mouse moving

NormDroid9-Jul-01 23:12

NormDroid

9-Jul-01 23:12

TrackMouseEvent

Remarks
=======

The mouse pointer is considered to be hovering when it stays within a specified rectangle for a specified period of time. Call SystemParametersInfo and use the values SPI_GETMOUSEHOVERWIDTH, SPI_GETMOUSEHOVERHEIGHT, and SPI_GETMOUSEHOVERTIME to retrieve the size of the rectangle and the time.

Note The _TrackMouseEvent function calls TrackMouseEvent if it exists, otherwise _TrackMouseEvent emulates TrackMouseEvent. The _TrackMouseEvent function is in commctrl.h and is exported by COMCTRL32.DLL.

Requirements
============
Windows NT/2000 or later: Requires Windows NT 4.0 or later.
Windows 95/98/Me: Requires Windows 98 or later.
Header: Declared in Winuser.h; include Windows.h.
Library: Use User32.lib.

Re: Mouse moving

9-Jul-01 23:42

You can use API function SetCapture.

Re: Mouse moving

9-Jul-01 23:50

I cannot, because left button on mouse must be down

Re: Mouse moving

Christian Graus9-Jul-01 23:53

Christian Graus

9-Jul-01 23:53

Not so. If left button is not down, then you'll LOSE capture when you click, but you'll still get the messages. I fixed this problem today by calling a timer to SetCapture and releasing capture whenever the mouse was over my dialog. If I didn't do this I couldn't push buttons in my dialog ( well, I had to try a few times ), but now it is all sweet - I track the mouse screen wide, respond as I want to outside my dialog and everything works as normal inside it.

Christian

#include "std_disclaimer.h"

People who love sausage and respect the law should never watch either one being made.

The things that come to those who wait are usually the things left by those who got there first.

Weired problem in using std library

9-Jul-01 22:35

Hello,

I created an application which using std::map, and std:vector. I declare them as

<br />
#typedef std::map<long, CSTRUCTA *> CSTRUCTALIST;<br />
#typedef std::map<long, CSTRUCTB *> CSTRUCTBLIST;<br />
<br />
class CMyClass<br />
{<br />
public:<br />
  CMyClass();<br />
<br />
  static UINT ThreadProcA(DWORD pParam);<br />
  static UINT ThreadProcB(DWORD pParam);<br />
<br />
private:<br />
  CSTRUCTALIST m_Vector1;<br />
  CSTRUCTBLIST m_Vector2;<br />
};<br />
<br />

I didn't do anting on the m_Vector1, and m_Vector2 in the constructor, then i let the threads running, but in ThreadProcB, I'm doing something like:

<br />
  for (itr = m_Vector1.begin(); itr != m_Vector1.end(); itr++)<br />
  {<br />
      //doing something<br />
  }<br />

As I didn't add anying to the m_Vector1, so it should contains nothing, but it can still enter the //doing something block and raise exception.
I tried use m_Vector1.size() to see the elements in the vector, it showed me -6xxxx, seems like rubblish value. incredible!

Anyone knows what's wrong ???

I'm using VC6, SP4

Re: Weired problem in using std library

Tomasz Sowinski10-Jul-01 0:36

Tomasz Sowinski

10-Jul-01 0:36

You're trying to access non-static m_Vector1 in static ThreadProcB. Where does this pointer come from?

Tomasz Sowinski -- http://www.shooltz.com

Re: Weired problem in using std library

10-Jul-01 15:42

Actually, ThreadProcB is calling ThreadRunB() which is a member function of CMyClass ( sorry, i just simplified my class to show out here ).

I passed this pointer to ThreadProcB(), and call the function as pThis->ThreadRunB() in ThreadProcB.

In my cass the m_Vector's should be created in the "main" thread when MyClass is instantiated. Then I created another thread with Thread function ThreadProcB, in turns calling ThreadRunB.

Is it exceed the limit of using STL containers ?

ie. Create in one thread, access in another thread. Any special thing I've to do about threading issue ?

Implement Dynamic & multiple inheritance

9-Jul-01 21:49

Hi everybody out there!

Is there any chance to use the implement dynamic macro in the MFC with
mutiple inherited classes?
Do I have to rewrite the macro?

Thanks for bothering,
Lars

Re: Implement Dynamic & multiple inheritance

Tomasz Sowinski10-Jul-01 0:39

Tomasz Sowinski

10-Jul-01 0:39

Don't think it's possible - remember that existing MFC classes are compiled with 'normal' IMPLEMENT_DYNAMIC. Of course, you could try to change the MFC sources and recompile, but this would be major PITA. What are you trying to achieve? Maybe there's easier way than re-implementing macros?

Tomasz Sowinski -- http://www.shooltz.com

How to modify DocString at runtime?

9-Jul-01 21:32

Hi,
I need to save/open files with 8 different extensions with one Document, but I only can set one DocString (extension, file filter for Open/Save Dlg,...).
How can I change the file filter and extension used in the Open/Save Dlg at runtime according which filetype I want to save?

Thank you!
Zoltan Confused | :confused:

Re: How to modify DocString at runtime?

Tomasz Sowinski10-Jul-01 0:42

Tomasz Sowinski

10-Jul-01 0:42

CDocTemplate::GetDocString is virtual - just create your own class derived from CSingleDocTemplate or CMultiDocTemplate and override GetDocString.

Tomasz Sowinski -- http://www.shooltz.com

Re: How to modify DocString at runtime?

10-Jul-01 3:01

Thank you!
Zoltan Smile | :)

Custom Drawn Close, Maximize and Minimize buttons

Andreas Philipson9-Jul-01 20:29

Andreas Philipson

9-Jul-01 20:29

I'm currently working on a project that would benefit from being able to move those icons and drawing them myself (I'm currently working on a skinning project...). Is it even possible???

Andreas Philipson

Re: Custom Drawn Close, Maximize and Minimize buttons

9-Jul-01 23:39

If you are going to make skining project may be better to organize your own controls.

But the standart buttons on the captions you can draw using
API function DrawFrameControl

Re: Custom Drawn Close, Maximize and Minimize buttons

Andreas Philipson9-Jul-01 23:43

Andreas Philipson

9-Jul-01 23:43

Probably, if this was only for one project but I'm planning on making this code as reusable as possible. I'd also like it if I could apply these skins on an old project with minimum work.

BTW, the article "Custom Captions" (in GDI) will probably do what I want...

[update] Nope that didn't work... any ideas anyone? [/update]

Andreas Philipson

How to broadcast in same LAN with Socket?

9-Jul-01 19:48

I want to send a message to every node in same LAN ,but i don't know the node's address. How to do?

Thanks!

QiangWang

Re: How to broadcast in same LAN with Socket?

markkuk9-Jul-01 20:49

markkuk

9-Jul-01 20:49

Send a broadcast message. See section 3.8 of the Winsock Programmer's FAQ

Templates errors I found and fix. But a quest...Why the errors?

C~~MFC6.0~~VS.NETUser9-Jul-01 18:33

C~~MFC6.0~~VS.NETUser

9-Jul-01 18:33

I have a template class(my 2nd one) that I am using here the code that give me error and the error latter.

class UseClassMemebersInTemplate
{
public:
void Build(){...};
void Kill();
...
};

template<Type& T>
class TemplateClass
{
public:
TemplateClass()
{
CallAFunctionInConstructor();
}

~TemplateClass()
{
CallAnotherFunctionInConstructor();
}

void CallAFunctionInConstructor()
{
T.Build();
}

void CallAnotherFunctionInConstructor()
{
T.Kill();
}
};

...
//In Another class same header file futher to EOF
...
TemplateClass<UseClassMemebersInTemplate> NewObj;

///////////
When the above is build in VC++ 6.0

I get a couple of errors one looks like...
"missing a ';' before '.'"

At one time I had the calls to Build() and Kill() but empty template constructor and destructor. So I comment constructor and destructor bodies and I was able to build it fine.

I was looking at my 1st template class that I build a year or two ago which applied to the class above modifiy only three places in the template. Keep in mind I going back to the code that gave me the errors. Here the changes I made...

1. Added a pointer to T as a memeber to the template call. Like "T* pT;".
2. Changed both call to Build() and Kill() from "T.Build();" and "T.Kill();" to "pT->Build();" and "pT->Kill();"

And it works find. I can live with calling w/ a pointer but if anyone know why I can use "T." please let me know why not.

Re: Templates errors I found and fix. But a quest...Why the errors?

9-Jul-01 19:36

One way is this:

class UseClassMemebersInTemplate
{
public:
void Build()
{
TRACE("Build\n");
};
void Kill()
{
TRACE("Kill\n");
};
};

template< class T >
class TemplateClass : public T
{
public:
TemplateClass()
{
CallAFunctionInConstructor();
}

~TemplateClass()
{
CallAnotherFunctionInConstructor();
}

void CallAFunctionInConstructor()
{
Build();
}

void CallAnotherFunctionInConstructor()
{
Kill();
}
};

Re: Templates errors I found and fix. But a quest...Why the errors?

9-Jul-01 21:55

you need to store an instance of UseClassMembersInTemplate in your template class and refer to that, ie, rather then T.whatever(), to myTInstance.Whatever().

template <class t="">
class CTemplateClass
{
private:
T myT;

public:
// now, use the myT member to do your stuff
};

Re: Templates errors I found and fix. But a quest...Why the errors?

C~~MFC6.0~~VS.NETUser10-Jul-01 4:46

C~~MFC6.0~~VS.NETUser

10-Jul-01 4:46

I see what was going on I wasn't storing UseClassMemebersInTemplate on the stack. So T when use with "T." isn't resolved to an object to call the function. When I used the pointer it work. I can see it is like using CFile::GetStatis(FileNameStr,...) so you don't need to opened the file first. The code I presented in my other post(using pointers) works for functions but I don't think it will work with varibles which I haven't worked on yet but will. I will change the declaration of the pointer to an instance of UseClassMembersInTemplate and call the functions and use varibles(when I have them) using the the stored object's instance.

Thank you for the help so I wouldn't have to post another thread call "Templates errors I found and fix. But a quest...Why the errors? - Varible Extendtion"

CArchive

XioPeng9-Jul-01 14:52

XioPeng

9-Jul-01 14:52

From web camera come image frames which i'd like to store in a file ( .bse i defined ).
to store received images i writed the following..

// msg structure contains head and pointer to the frame data.

RES_MSG msg;
nFrameSize = m_pCamera->ReadFrame(&msg, (char *)mFrameBuf, MAX_FRAME_BUF_SZ);

if( nFrameSize > 0 ) {
msg.u.frame_data = mFrameBuf;
m_pArchive->Write( &msg ,sizeof(RES_MSG)+ nFrameSize )
}
//

to retrieve frame i writed the following...

// m_pTempBuf buffer is enough to store data

RES_MSG * pmsg;
archive.Read( m_pTempBuf , bufsize );
pmsg = (RES_MSG *)m_pTempBuf;
pmsg->u.frame_data = (unsigned char *) ( m_pTempBuf + sizeof(RES_MSG) );
//

after all, i can get head information , but can't get frame data.
is there anything wrong ????
somebody please help me.
thanks in advance.

Last Visit: 31-Dec-99 18:00 Last Update: 11-Jun-24 7:26

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