memory leaks win32(other than new delete malloc free)

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In my project i never used new delete malloc calloc for any operation.
i used new operator only once to create object of xyz class in winmain() & free that object while exiting the project.

i had use vmr, vfw, gdi gdi plus ,icon instead of normal button in my application

after playing each new video memory is increases( in task manager)
even some times when i move mouse or click left button mem increases

how should i find is there any memory leak.

below code is used to textual display when cursor is move to any two icon(HOME & EXIT)

case WM_MOUSEMOVE:
{
HWND hwButton_home=GetDlgItem(g_hDialogWindow,IDC_ICON_HOME);
HWND hwButton_exit=GetDlgItem(g_hDialogWindow,IDC_ICON_EXIT);

WINDOWPLACEMENT lpwndpl_home;
WINDOWPLACEMENT lpwndpl_exit;

GetWindowPlacement(hwButton_home,&lpwndpl_home);
GetWindowPlacement(hwButton_analyze,&lpwndpl_exit);


		
if( ((lpwndpl_home.rcNormalPosition.left)<LOWORD(lParam)&& LOWORD(lParam)<(lpwndpl_home.rcNormalPosition.right)) && ((lpwndpl_home.rcNormalPosition.top)<HIWORD(lParam)&& HIWORD(lParam)<(lpwndpl_home.rcNormalPosition.bottom)))
{
if(IsWindowEnabled(hwButton_home))
{
 ::SetWindowPos(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), HWND_NOTOPMOST,  lpwndpl_home.rcNormalPosition.left,  lpwndpl_home.rcNormalPosition.bottom, 45,18, SWP_NOZORDER);      
  SetWindowText(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), "HOME");
   ShowWindow(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), TRUE);

}
}

else if( ((lpwndpl_exit.rcNormalPosition.left)<LOWORD(lParam)&& LOWORD(lParam)<(lpwndpl_exit.rcNormalPosition.right)) && ((lpwndpl_exit.rcNormalPosition.top)<HIWORD(lParam)&& HIWORD(lParam)<(lpwndpl_exit.rcNormalPosition.bottom)))
{	
if(IsWindowEnabled(hwButton_exit))
 {
::SetWindowPos(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), HWND_NOTOPMOST,  lpwndpl_exit.rcNormalPosition.left+5,  lpwndpl_exit.rcNormalPosition.bottom, 75,18, SWP_NOZORDER);      
   SetWindowText(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), "EXIT");
 ShowWindow(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), TRUE);

}
  }

else
                
ShowWindow(GetDlgItem(g_hDialogWindow, IDC_MODE_TEXT), FALSE);
}
break;

when i placed mouse on this icon 4 bytes of meme increases.

Posted 11-Jan-12 18:54pm

pranav_30

Updated 11-Jan-12 21:18pm

Prasad_Kulkarni

v3

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Jochen Arndt · Answer 1 · 2012-01-11T21:16:00

The API functions you are calling may also allocate memory. This memory is freed when the objects are destroyed. As already noted, you can't be sure that there are memory leaks when the used memory increases during operation. Only when there is unfreed memory upon application termination, you have memory leaks.

With debug builds, you may call AfxCheckMemory() within ExitInstance() of your CWinApp derived class to check the heap. But this will not detect all leaks.

krmed · Answer 2 · 2012-01-12T00:43:00

As stated. Task Manager doesn't reliably show you memory leaks. Since the number in task manager is increasing, try this - it will help see if there really is a leak.

Run your application and look at the task manager as the values increase. Next, minimize your application to the task bar. If the memory in the task manager drops back to what appears "normal", you probably don't have any leaks.

Minimizing the application causes the OS to release the working set memory. As your app uses memory, that addtional memory is put in a "working set" and not immediately released when it isn't needed - it's held in case you need it again. It would be released if needed by something else in the OS. Minimizing causes the OS to release that memory.

Hope that helps.

liedecoder · Answer 3 · 2012-01-11T19:05:00

Solution 1

memory increasing in task manager is not directly evidence of memory leaking.
if you make sure it is your program's issue, some tools may help e.g. boundsChecker

Posted 11-Jan-12 19:05pm

liedecoder

Comments

Mohibur Rashid 12-Jan-12 3:06am

that software has mind blowing review ;)

memory leaks win32(other than new delete malloc free)

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