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::GetFun ctionPointerFor Delegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(Stri ng^ url)
{
return CCrawler::Async Crawl(
(CRAWLCALLBACK) ptrDele.ToPoint er());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",: :GetCurrentThre adId()); // OK
printf("%d\n",T hread::CurrentT hread->ManagedThreadI d);//ERROR
};
delegate static void DeleOnCrawlEnd( );
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

CCrawler is a class exported from a traditional DLL,
CCrawler::Async Crawl()
accepts a function pointer as callback. After you call
CCrawler::Async Crawl(), 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.StackOv erflowException ".

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",: :GetCurrentThre adId()); // OK
printf("%d\n",T hread::CurrentT hread->ManagedThreadI d);//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::GetFun ctionPointerFor Delegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(Stri ng^ url)
{
return CCrawler::Async Crawl(
(CRAWLCALLBACK) ptrDele.ToPoint er());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",: :GetCurrentThre adId()); // OK
printf("%d\n",T hread::CurrentT hread->ManagedThreadI d);//ERROR
};
delegate static void DeleOnCrawlEnd( );
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

>

"CAIBird" <CA*****@discus sions.microsoft .comwrote in message
news:A4******** *************** ***********@mic rosoft.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",: :GetCurrentThre adId()); // OK
printf("%d\n",T hread::CurrentT hread->ManagedThreadI d);//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::GetFun ctionPointerFor Delegate(dele);
}
static void Uninitialize()
{
gch.Free();
}
static int AsyncCrawl(Stri ng^ url)
{
return CCrawler::Async Crawl(
(CRAWLCALLBACK) ptrDele.ToPoint er());
}
private:
static void OnCrawlEnd()
{
printf("%d\n",: :GetCurrentThre adId()); // OK
printf("%d\n",T hread::CurrentT hread->ManagedThreadI d);//ERROR
};
delegate static void DeleOnCrawlEnd( );
static DeleOnCrawlEnd^ dele;
static GCHandle gch;
static IntPtr ptrDele;
};

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

--

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