How to invoke a managed function from a unmanaged thread?

public ref class CrawlerWrapper abstract sealed
{
public:
static void Initialize()
{
dele = gcnew DeleOnCrawlEnd(OnCrawlEnd);
gch = GCHandle::Alloc(dele);
ptrDele = Marshal::GetFunctionPointerForDelegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(String^ url)
{
return CCrawler::AsyncCrawl(
(CRAWLCALLBACK)ptrDele.ToPointer());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",::GetCurrentThreadId()); // OK
printf("%d\n",Thread::CurrentThread->ManagedThreadId);//ERROR
};
delegate static void DeleOnCrawlEnd();
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

CCrawler is a class exported from a traditional DLL,
CCrawler::AsyncCrawl()
accepts a function pointer as callback. After you call
CCrawler::AsyncCrawl(), it will create a thread to perform a task and then
when the thread has done, it will call the callback function to inform you
some information.

My problem is that my callback function CrawlerWrapper::OnCrawlEnd()
crashes
when excutes the second line with a exception of
"System.StackOverflowException".

I can't figure out the root cause. Could anyone help me?
Many many thanks.

Thanks,

The native callback is defined as:
typedef void (__stdcall *CRAWLCALLBACK)(void);

The delegate is declared as:
delegate static void DeleOnCrawlEnd();

and defined as:
static void OnCrawlEnd()
{
printf("%d\n",::GetCurrentThreadId()); // OK
printf("%d\n",Thread::CurrentThread->ManagedThreadId);//ERROR
};
"Bruno van Dooren [MVP VC++]" wrote:

////////////// CrawlerWrapper.h
public ref class CrawlerWrapper abstract sealed
{
public:
static void Initialize()
{
dele = gcnew DeleOnCrawlEnd(OnCrawlEnd);
gch = GCHandle::Alloc(dele);
ptrDele = Marshal::GetFunctionPointerForDelegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(String^ url)
{
return CCrawler::AsyncCrawl(
(CRAWLCALLBACK)ptrDele.ToPointer());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",::GetCurrentThreadId()); // OK
printf("%d\n",Thread::CurrentThread->ManagedThreadId);//ERROR
};
delegate static void DeleOnCrawlEnd();
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

>

"CAIBird" <CA*****@discussions.microsoft.comwrote in message
news:A4**********************************@microsof t.com...

Thanks,

The native callback is defined as:
typedef void (__stdcall *CRAWLCALLBACK)(void);

The delegate is declared as:
delegate static void DeleOnCrawlEnd();

and defined as:
static void OnCrawlEnd()
{
printf("%d\n",::GetCurrentThreadId()); // OK
printf("%d\n",Thread::CurrentThread->ManagedThreadId);//ERROR
};
"Bruno van Dooren [MVP VC++]" wrote:

////////////// CrawlerWrapper.h
public ref class CrawlerWrapper abstract sealed
{
public:
static void Initialize()
{
dele = gcnew DeleOnCrawlEnd(OnCrawlEnd);
gch = GCHandle::Alloc(dele);
ptrDele = Marshal::GetFunctionPointerForDelegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(String^ url)
{
return CCrawler::AsyncCrawl(
(CRAWLCALLBACK)ptrDele.ToPointer());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",::GetCurrentThreadId()); // OK
printf("%d\n",Thread::CurrentThread->ManagedThreadId);//ERROR
};
delegate static void DeleOnCrawlEnd();
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

Could you post the code for
CCrawler::AsyncCrawl?
Or don't you have that?

--

Kind regards,
Bruno van Dooren
br**********************@hotmail.com
Remove only "_nos_pam"