problem deleting char* used in threads
- From: "Abubakar" <emailallrise@xxxxxxxxx>
- Date: Thu, 10 Aug 2006 15:37:41 +0500
Hi all,
My solution consists of 2 projects, 1 is a dll (contains sockets
functionality, multithreaded), and the other is a wtl gui project. Both are
totally unmanaged. The gui app has a edit box, acting as a console, where I
send messages from dll to be displayed. The way I am sending messages is:
for sending the message:
void CGlobal::SendMessage(char * chptr )
{
extern HWND c_main_window_handle;
char * tmp = new char [ strlen ( chptr) +1 ];
strcpy ( tmp, chptr );
::SendMessage( c_main_window_handle, WM_DISPLAY_MSG, 200, (LPARAM)tmp);
}
(this function is somewhere inside the dll) any thread can call this class
and pass it any character array, it will create its own buffer, copy and
send its pointer to the gui thread.
The gui application has a file that has this function declared:
LRESULT proc_display_message(UINT /*uMsg*/, WPARAM wParam, LPARAM lParam,
BOOL& /*bHandled*/)
proc_display_message receives the message and does something like this:
......
case 200:
char * ptr = (char * )lParam ;
diagtext->AppendText (ptr);
diagtext->AppendText ("\r\n");
delete [] ptr ; // this was allocated somewhere else and I plan to delete
it over here .
break;
.....
I get an error on the delete [] ptr line. It says:
-
Windows has triggered a breakpoint in OtengoGUI.exe.
This may be due to a corruption of the heap, and indicates a bug in
OtengoGUI.exe or any of the DLLs it has loaded.
The output window may have more diagnostic information
-
and the debugger stops at the following line with a green pointer arrow:
-
void InsertText(int nInsertAfterChar, LPCTSTR lpstrText, BOOL bNoScroll =
FALSE, BOOL bCanUndo = FALSE)
{
SetSel(nInsertAfterChar, nInsertAfterChar, bNoScroll);
ReplaceSel(lpstrText, bCanUndo);
}<< ----------- this line
-
Why cant I delete a pointer that I got after casting from lParam parameter.
After all the allocation for this function was done on the heap and I should
be able to delete it anywhere else, thats what I was thinking.
Regards,
-ab.
Environment: visual studio 2k5, vc++ (unmanaged) WTL, windows 2000.
.
- Follow-Ups:
- Re: problem deleting char* used in threads
- From: SvenC
- Re: problem deleting char* used in threads
- From: Vladimir Nesterovsky
- Re: problem deleting char* used in threads
- From: Bruno van Dooren [MVP VC++]
- Re: problem deleting char* used in threads
- From: Arnaud Debaene
- RE: problem deleting char* used in threads
- From: Wim
- Re: problem deleting char* used in threads
- Prev by Date: Re: STUDIO
- Next by Date: RE: problem deleting char* used in threads
- Previous by thread: STUDIO
- Next by thread: RE: problem deleting char* used in threads
- Index(es):
Relevant Pages
|
