Re: Memory Leak - C / C++ / MFC Discussion Boards

Re: Cannot get the correct cursor position in picture control

Code-o-mat4-Feb-09 6:43

4-Feb-09 6:43

Well, if you load a new bitmap into your picture control then yes, the lines will be gone. And for the memdc, you can do something like this:

CDC MemDC;
MemDC.CreateCompatibleDC(dc_of_picture_control);
CBitmap *origBitmap = MemDC.SelectObject(pointer_to_bitmap_you_want_to_draw_to);
MemDC.MoveTo(0, 0);
MemDC.LineTo(line_to_x, line_to_y);
MemDC.SelectObject(origBitmap);
MemDC.DeleteDC();

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Cannot get the correct cursor position in picture control

z01e4-Feb-09 7:11

z01e

4-Feb-09 7:11

void CMyGUIDlg::OnStnClickedPic1()
{
CWnd* prnt = GetDlgItem(IDC_PIC1);
CDC *pdc = prnt->GetDC();
CDC MemDC;
MemDC.CreateCompatibleDC(pdc);
CBitmap *origBitmap = (CBitmap*)MemDC.SelectObject(&m_pic1); //m_pic1.SetBitmap("LenaRGB.BMP");
MemDC.MoveTo(0, 0);
MemDC.LineTo(100,100 );
MemDC.SelectObject(origBitmap);
MemDC.DeleteDC();
}

T_T still can't do it. i try what you said but it is still no line after i minimize it.

hope you not bored me yet i'm sorry but thank you very much

Re: Cannot get the correct cursor position in picture control

Code-o-mat4-Feb-09 7:59

Code-o-mat

4-Feb-09 7:59

What is m_pic1? Isn't it a CStatic that shows your bitmap? If it is, don't select THAT into the DC (you shouldn't be able to do that i think), ask it for its bitmap and select that. So if it is a CStatic or derivative, try using GetBitmap[^] like:

...
CBitmap TempBmp;
TempBmp.Attach(m_pic1.GetBitmap());
CBitmap *origBitmap = MemDC.SelectObject(&TempBmp);
...
MemDC.SelectObject(origBitmap);
TempBmp.Detach();
...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Cannot get the correct cursor position in picture control

z01e4-Feb-09 8:42

z01e

4-Feb-09 8:42

still doesnt work - -
but thank you very much

i load image by using this.

void CPictureBox::ShowBitmap(CPaintDC *pdc)
{
//Create a device context to load the bitmap into
CDC dcMem;
dcMem.CreateCompatibleDC(pdc);

//Get the Display area available
CRect lRect;
GetClientRect(lRect);
lRect.NormalizeRect();

//select the bitmap into compatible device context
CBitmap* pOldBitmap = (CBitmap*)dcMem.SelectObject(&m_bmpBitmap);
//m_bmpBitmap.SetBitmapDimension(lRect.Width(),lRect.Height());

//copy & resize the window to the dialog window
pdc->StretchBlt(0,0,lRect.Width(),lRect.Height(),&dcMem,0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);
}
void CPictureBox::OnPaint()
{
CPaintDC dc(this); // device context for painting

RECT rect;
GetClientRect(&rect);
dc.FillSolidRect(&rect, RGB(255,255,255));

if(m_sBitmap!="")
ShowBitmap(&dc);
}
void CPictureBox::SetBitmap(CString strBitmap)
{
m_sBitmap = strBitmap;

HBITMAP hBitmap = (HBITMAP) ::LoadImage(AfxGetInstanceHandle(),
m_sBitmap, IMAGE_BITMAP, 0, 0,
LR_LOADFROMFILE | LR_CREATEDIBSECTION);

// Do we have a valid handle for the loaded image?
if (hBitmap)
{
// Delete the current bitmap
if (m_bmpBitmap.DeleteObject())
m_bmpBitmap.Detach(); // If there was a bitmap, detach it
// Attach the currently loaded bitmap to the bitmap object
m_bmpBitmap.Attach(hBitmap);
}
m_bmpBitmap.GetBitmap(&bm); //Get Bitmap Structure
Invalidate();
}

maybe this is why it doesn't work.and i dont know what should i do with it to make this work. T_T

anyway thanks to you.

Re: Cannot get the correct cursor position in picture control

Code-o-mat4-Feb-09 10:12

Code-o-mat

4-Feb-09 10:12

I believe -according to what i see in the code you gave- you have to select m_bmpBitmap into the memory-dc when you draw the lines.
Btw i see you are using StretchBlt, that will cause problems with drawing those lines, but first try to get it to keep the lines first.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Re: Cannot get the correct cursor position in picture control

z01e4-Feb-09 23:05

z01e

4-Feb-09 23:05

thank you for all your help.

Memory Leak

rr_ramesh714-Feb-09 1:37

rr_ramesh71

4-Feb-09 1:37

I have a static function in that I have some array members, that function will be called from so many places, I want to know that when ever the process of the function is over means all the member variables will be get released from memory or will Occupy the space.

Re: Memory Leak

prasad_som4-Feb-09 1:42

prasad_som

4-Feb-09 1:42

rr_ramesh71 wrote:
I have some array member

What kind of array it is ?

Re: Memory Leak

rr_ramesh714-Feb-09 2:18

rr_ramesh71

4-Feb-09 2:18

char lbuffer[5000]; // will this array get released after the function over
sprintf(lbuffer,"Stock in List [%s] Quantiry %d",  SymbolList,qty);

but according to me memory is keeps on increasing when ever we call the function it is not reducing after it is completed

Re: Memory Leak

Cedric Moonen4-Feb-09 2:37

Cedric Moonen

4-Feb-09 2:37

Yes the buffer will be released.

rr_ramesh71 wrote:
but according to me memory is keeps on increasing when ever we call the function it is not reducing after it is completed

How do you check that ? Are you using some tools to verify that information ?

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Memory Leak

prasad_som4-Feb-09 3:32

prasad_som

4-Feb-09 3:32

rr_ramesh71 wrote:
// will this array get released after the function over

Yes, You don't need to worry about memory, as its been allocated on stack.

Re: Memory Leak

Stuart Dootson4-Feb-09 1:43

Stuart Dootson

4-Feb-09 1:43

How are the arrays declared?

If they're declared as local variables (as shown with localArray below), they will definitely be cleared up, as they're allocated space on the stack, which is tidied up when the function exits.

double SomeFunction(int x)
{
   double localArray[] = { 1.0, 2.0, 3.0, 4.0 };
   const size_t localArraySize = sizeof localArray / sizeof localArray[0];
   return x<localArraySize?localArray[x]:-1.0;
}

Re: Memory Leak

Cedric Moonen4-Feb-09 1:46

Cedric Moonen

4-Feb-09 1:46

The only thing you have to take care in this case, is that if you are allocating memory with new (or new[]), then you should delete it with delete (or delete[]). For the rest, the memory will be automatically released.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: Memory Leak

Code-o-mat4-Feb-09 2:25

Code-o-mat

4-Feb-09 2:25

Also don't forget malloc and free (I know, i know, don't use malloc and free in C++ but they CAN be used), and maybe GlobalAlloc and GlobalFree (or LocalAlloc and LocalFree but as far as i know those are no longer different from their Global counterparts)

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

testing a ini file in vc++6

hrishiS4-Feb-09 1:26

hrishiS

4-Feb-09 1:26

Hello everyone,

In order to test a ini file (for the read write operation) what are the steps I should make...What I have dome is...
I created an ini file in the current directory, also inside the debug folder.Then I added that to my project workspace....and I wrote the following code

int iResult = GetPrivateProfileInt("extensions","123",555,"info.ini");
cout<<"\n-:"<<iResult;

my ini file content is

[extensions]

123=001100
333 = 9999

444=8888

But its always returning 555
What mistake I might have done?
project is a win32 application

Thanks in advance

I am a learner Always

Re: testing a ini file in vc++6

prasad_som4-Feb-09 1:39

prasad_som

4-Feb-09 1:39

himangshuS wrote:
,"info.ini");

Try giving full path of this file. I think it's not in local folder of you application.

Re: testing a ini file in vc++6

hrishiS4-Feb-09 2:47

hrishiS

4-Feb-09 2:47

still the same

I am a learner Always

Re: testing a ini file in vc++6

krmed4-Feb-09 2:54

krmed

4-Feb-09 2:54

If you are running your program from withing Visual Studio (pressing F5 for instance) the working folder is the same folder that has your .vcproj/.sln files - NOT the debug/release folder, so you file would have to exist in the same folder as the .vcproj/.sln.

When you run the program by directly clicking on the .exe file from Windows Explorer, the working folder is initially the same folder with the .exe.

Also, is there some reason that you have blank lines in your .ini file?

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: testing a ini file in vc++6

hrishiS4-Feb-09 3:01

hrishiS

4-Feb-09 3:01

I have the same file in the debug folder too....
And ya I removed the blank lines and tried....

But the same again...

I am a learner Always

Re: testing a ini file in vc++6

David Crow4-Feb-09 3:14

David Crow

4-Feb-09 3:14

himangshuS wrote:
still the same

But what does your changed code look like? If you provide the correct path, the value of iResult will be 1100.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

Re: testing a ini file in vc++6

hrishiS4-Feb-09 3:58

hrishiS

4-Feb-09 3:58