C / C++ / MFC

C++ app with no MS CRT usage

28-Feb-06 11:47

So the file is a series of shorts. Simply open the file and read in one short at a time.

You may be right
I may be crazy
But it just may be a lunatic you’re looking for
-- Billy Joel --

Within you lies the power for good - Use it!

Jim Crafton28-Feb-06 10:00

Jim Crafton

28-Feb-06 10:00

Has anyone built a C++ app that uses the STL but does NOT use the CRT? Is this possible?

¡El diablo está en mis pantalones! ¡Mire, mire!

Real Mentats use only 100% pure, unfooled around with Sapho Juice(tm)!

SELECT * FROM User WHERE Clue > 0
0 rows returned

Save an Orange - Use the VCF!

Re: C++ app with no MS CRT usage

PJ Arends28-Feb-06 11:12

Re: C++ app with no MS CRT usage

28-Feb-06 11:12

Not possible, STL uses the CRT.

You may be right
I may be crazy
But it just may be a lunatic you’re looking for
-- Billy Joel --

Within you lies the power for good - Use it!

James Brown28-Feb-06 13:00

James Brown

28-Feb-06 13:00

I was thinking that in some ways, STL is the CRT so the two cannot really be separated...but here's a thought:

If you define the STL to be just a collection of header-files, and the CRT to be things like new[], delete[] etc

Then it would be possible to write your own implementation of global new[], delete[], plus provide a few other necessary house-keeping routines like mainCRTStartup. Add the compiler option to strip the CRT, and maybe one could cobble something together which, when linked to your 'custom' CRT, could be twisted enough to meet the original requirement...

can't imagine why anyone would want to do this..

james

http://www.catch22.net

Re: C++ app with no MS CRT usage

derek728-Feb-06 15:17

derek7

28-Feb-06 15:17

I have oppsite question. it should have more sense.

if you do not use stl stuff ,how to unlinke stl lib from my project?

it seem stl is default linked to any c++ project(I use vc)

debugging an exe on windows xp

ns28-Feb-06 8:20

28-Feb-06 8:20

What can be used on windows xp to debug an application at runtime? I cant step through it because its an exe thats launched by another exe, and it calls some dlls, which might be where the problem is occuring,
thanks,
sb

SDI's View DC

masnu28-Feb-06 6:54

28-Feb-06 6:54

Is there a way of sending my class a pointer to my view's DC. I would like to draw to the DC and then "blit" it back to the screen. Until now I have only been able to get the DC for the main window.

Thanks.

PJ Arends28-Feb-06 7:40

28-Feb-06 7:40

CFrameWnd::GetActiveView will return a pointer to your CView derived window, you can call GetDC on that view

You may be right
I may be crazy
But it just may be a lunatic you’re looking for
-- Billy Joel --

Within you lies the power for good - Use it!

masnu28-Feb-06 7:59

28-Feb-06 7:59

I tried what you suggested and I get an "illegal call of non-static member function" error.

CView* pView = CFrameWnd::GetActiveView();<br />
CDC* pDC = myview->GetDC();

I am new to the whole MFC programming scene so I am sure I am doing something really silly.

Thanks for the help.

-- modified at 14:00 Tuesday 28th February, 2006

David Crow28-Feb-06 8:12

28-Feb-06 8:12

masnu wrote:
CView* pView = CFrameWnd::GetActiveView();

GetActiveView() is not a static function (i.e., one that can be called without an actual object). You must call it in the context of a CFrameWnd object, not CFrameWnd itself.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

masnu28-Feb-06 8:52

28-Feb-06 8:52

David,

From what you said I assume I need to put the code in my CMainFrame class, which I did. I no longer get a compiler error, but I get an access violation error in the objcore.cpp file:

BOOL CObject::IsKindOf(const CRuntimeClass* pClass) const<br />
{<br />
	ENSURE(this != NULL);<br />
	// it better be in valid memory, at least for CObject size<br />
	ASSERT(AfxIsValidAddress(this, sizeof(CObject)));<br />
<br />
	// simple SI case<br />
	CRuntimeClass* pClassThis = GetRuntimeClass();   //ERROR HERE<br />
<br />
	ENSURE(pClassThis);<br />
	return pClassThis->IsDerivedFrom(pClass);<br />
}

What I have is:

void CMainFrame::Scroll()<br />
{<br />
	CDC* pDC = CFrameWnd::GetActiveView()->GetDC();<br />
<br />
	CStripChart* pStrip;<br />
	pStrip->Scroll(pDC);<br />
}

Any suggestions?

Thanks.

David Crow28-Feb-06 9:05

28-Feb-06 9:05

masnu wrote:
CStripChart* pStrip;
pStrip->Scroll(pDC);

This looks suspect. How has pStrip been initialized?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

masnu28-Feb-06 9:37

28-Feb-06 9:37

When I debug, that code doesn't even run. The problem occurs when

CDC* pDC = CFrameWnd::GetActiveView()->GetDC();

is executed.

CStripChart is just a class I created to accept a DC and draw a grid to it and plot what ever data is sent to it. I have scroll function as a seperate thread. Could this be a problem?

Is there any way I can get a pointer to the view's DC and pass it to my class for furture use? Or would I need to pass a new DC everytime I wanted to update my window?

David Crow28-Feb-06 10:01

28-Feb-06 10:01

What does GetActiveView() return? If it is NULL, then dereferencing the pointer will cause problems.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

masnu28-Feb-06 10:34

28-Feb-06 10:34

It doesn't return anything. I get the error before it returns.

David Crow28-Feb-06 10:40

28-Feb-06 10:40

When/how is CMainFrame::Scroll() called?

masnu wrote:
I get the error before it returns.

Since GetActiveView() and GetDC() are called within the same statement, are you sure?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

masnu28-Feb-06 10:43

28-Feb-06 10:43

As a quick test I modified the app's file open command:

ON_COMMAND(ID_FILE_OPEN, &CMainFrame::Scroll)

David Crow28-Feb-06 10:45

28-Feb-06 10:45

masnu wrote:
ON_COMMAND(ID_FILE_OPEN, &CMainFrame::Scroll)

What is the ampersand doing there?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

masnu28-Feb-06 10:54

28-Feb-06 10:54

I just followed the same format as all the other ON_COMMAND declarations. I tried runnig the program without the ampersand and I still get the same problem.

PJ Arends28-Feb-06 11:00

Re: How Thread Run Parallely

28-Feb-06 11:00

void CMainFrame::Scroll()
{
CDC *pDC = this->GetActiveView()->GetDC();

You may be right
I may be crazy
But it just may be a lunatic you’re looking for
-- Billy Joel --

Within you lies the power for good - Use it!

How Thread Run Parallely

zahid_ash28-Feb-06 6:52

zahid_ash

28-Feb-06 6:52

I have created my own class CThread inherited from CWinThread,
I am Starting Threads using

for loop begin
AfxBeginThread(RUNTIME_CLASS(CThread));
for loop ends

I have created 15 thread in a loop, will they run parallely or with the time slice scheduling, Actualy I want that they should run parralelly , so that i can write in 15 different file simaltinoiusly.

I want to work fast on these threads.

Regards.

David Crow28-Feb-06 7:13