C / C++ / MFC Discussion Boards

Nish Nishant25-Mar-02 17:14

25-Mar-02 17:14

ChiYung wrote:
Is it OK???

NO

CCriticalSection cs; <--- this is now a temp variable

Make it a member of your class or make it global

Nish

I am looking for a free racing game. Old style racing game without any complicated 3D stuff. Around 4 MB download. If anyone has such a game, please inform me.

Re: CCriticalSection question

ChiYung25-Mar-02 19:15

ChiYung

25-Mar-02 19:15

Nish [BusterBoy] wrote:
Make it a member of your class or make it global

I tried to declare it in StdAfx.h and .cpp:

In StdAfx.h:
extern CCriticalSection cs;

In StdAfx.cpp
CCriticalSection cs;

But i have this error message:

"error C2146: syntax error : missing ';' before identifier 'cs'
fatal error C1004: unexpected end of file found"

What happened??

I tried to put it in ....Dlg.h...........same error.........

Can you help me!!!????

Thanks!!!!

Re: CCriticalSection question

Nish Nishant25-Mar-02 19:15

Nish Nishant

25-Mar-02 19:15

Dont put it in stdafx.h
Cause when you put it on top, the compiler hasn't encountered the included header files yet

Make it a member variable of the class where you are using the critical section

Nish

I am looking for a free racing game. Old style racing game without any complicated 3D stuff. Around 4 MB download. If anyone has such a game, please inform me.

Re: CCriticalSection question

Michael Dunn25-Mar-02 17:31

Michael Dunn

25-Mar-02 17:31

No, because you're creating the critical section on the stack. Each thread has its own stack, so when two threads enter the function they use different critical sections.
You need to have one critical section and then access it in all threads.

--Mike--
It's hammer time!
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.

Example please....(Re: CCriticalSection question)

ChiYung25-Mar-02 19:03

ChiYung

25-Mar-02 19:03

Hi,

Thanks for all your replies.......

But I'm not quite understand........can you give me some example codes???

Thanks

Re: Example please....(Re: CCriticalSection question)

Nish Nishant25-Mar-02 19:17

Nish Nishant

25-Mar-02 19:17

Tell you what, since you seem to have trouble making it a member of your class, for whatever reasons do this then :-

Make it a member of the CWinApp derived class.
Now use AfxGetApp(), cast the pointer returned to your CWinApp derived class and access the critical section variable.

Nish

I am looking for a free racing game. Old style racing game without any complicated 3D stuff. Around 4 MB download. If anyone has such a game, please inform me.

Re: Example please....(Re: CCriticalSection question)

ChiYung25-Mar-02 19:30

ChiYung

25-Mar-02 19:30

Nish [BusterBoy] wrote:
Make it a member of the CWinApp derived class.
Now use AfxGetApp(), cast the pointer returned to your CWinApp derived class and access the critical section variable.

I'm not quite understand how to make it a member of the CWinApp, or even make it global. Can you give me some examples??

LOTS OF THANKS!!!!!!!!!

Re: Example please....(Re: CCriticalSection question)

Gaurika Wijeratne25-Mar-02 22:07

Gaurika Wijeratne

25-Mar-02 22:07

Dear Friend

I don't know whether this is going to solve your problem , This is how to make a variable global. double click the "theApp" Global variable in your project.then you can see the declaration

eg:

CMyApp theApp;

//Put your variable as follows

CCriticalSection cs;

//Now this is global

Then go to the implimentation file of the class where you want to use this varialble,and put is as follows

eg:

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

//Global Variable, Now use this in your function

extern CCriticalSection cs;

// CMyApp

BEGIN_MESSAGE_MAP(CMyApp, CWinApp)
ON_COMMAND(ID_HELP, CWinApp::OnHelp)
END_MESSAGE_MAP()

Gaurika Wijeratne

Re: CCriticalSection question

Neville Franks31-Mar-02 0:42

Neville Franks

31-Mar-02 0:42

ChiYung wrote:
CCriticalSection cs;

If you just want to protect what is happening inside this function then simple change it to:

static CCriticalSection cs;

As others have said it can't be on the stack under any circumstances.

Neville Franks, Author of ED for Windows. www.getsoft.com

How to change the bkcolor of a window?

Feng Qin25-Mar-02 15:18

Feng Qin

25-Mar-02 15:18

I use the following code:
/////////////////////////////////////
this->GetDC()->SetBkColor( RGB(0,0,255) );
this->SendMessage( WM_PAINT, 0, 0 );
//////////////////////////////////////
But no efforts, what's the matter?

I'm amumu, and you?

Re: How to change the bkcolor of a window?

Michael Dunn25-Mar-02 17:29

Michael Dunn

25-Mar-02 17:29

Handle the WM_ERASEBKGND message. (see the VC Forum FAQ for more)

--Mike--
It's hammer time!
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan and Jamie Salé.

Vector array question.....

ChiYung25-Mar-02 15:11

ChiYung

25-Mar-02 15:11

hi,

Take a look the structure of my array first:

struct WAITQUEUE_STRUCT
{
CWinThread* pThread;
int LockType;
LARGE_INTEGER start_time;
};

struct LOCK_TABLE
{
CWinThread* CurrentThread;
int CurrentLock;
std::vector<WAITQUEUE_STRUCT> WaitQueue;
};

std::vector<LOCK_TABLE> LockTable;

In my program:

std::vector <WAITQUEUE_STRUCT>::iterator Iter;

for (int i=0; i<NumOfDBObject; i++)
{
Iter = LockTable[i].WaitQueue.begin();
if (*Iter.pThread != NULL) <- one of the error here
{ .......
.......
.......

i got the error message :

"error C2228: left of '.pThread' must have class/struct/union type"

What happened??????

Re: Vector array question.....

Vivek Rajan25-Mar-02 15:10

Vivek Rajan

25-Mar-02 15:10

ChiYung wrote:
for (int i=0; i{
Iter = LockTable[i].WaitQueue.begin();
if (*Iter.pThread != NULL) <- one of the error here
{ .......

(*iter).pThread
or
iter->pThread

Help me to get the solution

binnu25-Mar-02 15:04

binnu

25-Mar-02 15:04

DEar Friends
I always refer Charles Petzold book fo basic programming code. So I want to get a complete .dsw file. Kindly give/send me any such zip file which reads a bitmap file and then display it after getting hdc. I am working on Win32API only.
Thanking you in advance.
Binay
Frown | :(

Re: Help me to get the solution

PJ Arends25-Mar-02 16:31

PJ Arends

25-Mar-02 16:31

after you use LoadImage to load the bitmap, use this code in your window procedure to draw it:

case WM_PAINT:
{
    hdc = BeginPaint(hWnd, &ps);
    RECT rt;
    GetClientRect(hWnd, &rt);
    HDC DC = CreateCompatibleDC(hdc);
    // hBitmap is the bitmap loaded with LoadImage
    HBITMAP oldBitmap = (HBITMAP)SelectObject(DC, hBitmap);
    BitBlt(hdc, 0, 0, rt.right, rt.bottom, DC, 0, 0, SRCCOPY);
    SelectObject(DC, oldBitmap);
    DeleteDC(DC);
    EndPaint(hWnd, &ps);
}

HTH

---
CPUA 0x5041

Sonork 100.11743 Chicken Little

It may be that your sole purpose in life is simply to serve as a warning to others.

Re: Help me to get the solution

PJ Arends25-Mar-02 17:18

PJ Arends

25-Mar-02 17:18

If I did that, I would be doing your homework for you. It should be very easy to figure out with the code I have given you. If you have any more specific questions, ask the in this forum, there are lots of people who will help you.

---
CPUA 0x5041

Sonork 100.11743 Chicken Little

It may be that your sole purpose in life is simply to serve as a warning to others.

I want to terminate the FOR loop at the middle...

ChiYung25-Mar-02 14:41

ChiYung

25-Mar-02 14:41

Hi,

I would like to terminate the FOR loop at the middle of the loop. E.g.

for (i=0; i<100; i++)
{
if (i == 50)
break;
}

Is it use break???? Or.........

Thanks!!!!

Re: I want to terminate the FOR loop at the middle...

Derek Waters25-Mar-02 14:44

Derek Waters

25-Mar-02 14:44

Yes.

------------------------
Derek Waters
derek@lj-oz.com

timer..

hkl25-Mar-02 14:14

hkl

25-Mar-02 14:14

Hi,

Is there a function to set a timer?? In my case, I want to keep track of the time that a thread is being suspended, so that it would be suspended forever.

Or, can you give me any suggestion to do that??

Thank you! OMG | :OMG:

Re: timer..

Nish Nishant25-Mar-02 14:15

Nish Nishant

25-Mar-02 14:15

You can use SetTimer and then in the handler do your custom time tracking.

Nish

I am looking for a free racing game. Old style racing game without any complicated 3D stuff. Around 4 MB download. If anyone has such a game, please inform me.

Re: timer..

hkl25-Mar-02 15:29

hkl

25-Mar-02 15:29

Thank you so much for your reply..! Smile | :)

But, I still have problem with SetTimer(). I always got error messages like "function does not take 1 (or 2) parameters". Can you please give me an example of using SetTimer?? For example: what I can do if I want to count in 5 sec??

Thank you !

Re: timer..

Nish Nishant25-Mar-02 16:12

Nish Nishant

25-Mar-02 16:12

SetTimer(1000,5000,NULL);

1000 is the ID of this particular timer
5000 means 5 seconds
NULL means the WM_TIMER handler of the CWnd object gets called

Nish

I am looking for a free racing game. Old style racing game without any complicated 3D stuff. Around 4 MB download. If anyone has such a game, please inform me.

Re: timer.. Thank you! :)

hkl25-Mar-02 16:22

hkl

25-Mar-02 16:22

Thank you very much! Cool | :cool:

Re: timer..

Le centriste26-Mar-02 2:03

Le centriste

26-Mar-02 2:03

If you want to keep track of the time, you better use GetTickCount()

Michel

If I am wrong or said something stupid, I apologize in advance Wink | ;)

Re: timer..

Tim Smith26-Mar-02 2:23

Tim Smith

26-Mar-02 2:23

As long as you watch out for overflow in the count.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

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