Re: debug assertion error in threads of c++ under windows
- From: "Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
- Date: Mon, 12 Mar 2007 09:57:01 -0400
Pushpa wrote:
Hi All,
This my part of the c++ program using threads in windows :
//modified by pushpa
struct structExrdDoc
{
CExrdDoc* spDoc;
LPCTSTR sstrFileName;
structExrdDoc():spDoc(NULL),sstrFileName(""){}
};
structExrdDoc sp;
volatile bool running;
UINT CExcelExport::run(LPVOID p)
{
CExrdDoc* me = sp.spDoc;
me->OnSaveDocument ((LPCTSTR)sp.sstrFileName);
running = FALSE;
return 0;
}
//modified by pushpa
void CExcelExport::SaveExcelFile (CExrdDoc* pDoc, const string&
strFileName)
{
sp.spDoc = pDoc; //modified by pushpa
sp.sstrFileName = strFileName.c_str(); //modified by pushpa
running = TRUE; //modified by pushpa
AfxBeginThread(run,NULL); //modified by pushpa
//pDoc->OnSaveDocument (strFileName.c_str()); //modified by pushpa
}
Here the line of code I have commented was taking lot of time, so I hv
tried to use threads and I am new to this.
This is the declaration in the .h file
static UINT CExcelExport::run(LPVOID p);
After some struggle I could compile the application, but when it is
run I am getting a Debug assertion error.
debug assertion failed!
program:d:\amsa\amsa\bin\gageanalysisdlld.exe
file:wincore.cpp
line:888
for information on how your program can cause an assertion failure,
see the visual c++ documentation on asserts.
Could you please help me with this.
Thanking you in advance,
Pushpa.
In addition to the bug described by Wim...
OnSaveDocument is not designed to be executed from a secondary thread. The problem is related to accessing windows created in the main thread, which is not permitted by MFC. If you look in the stack window when the assert happens you will see where in the CDocument code a window is accessed.
You could write a new document function to save your data without accessing any windows, or you could save the data in the thread function without calling the CDocument function.
--
Scott McPhillips [VC++ MVP]
.
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