Pinvoke question: Am I causing this stack overflow?

[=?Utf-8?B?VG9tIEFsbGVu?=]

Hi, TIA for any help.
(Thanks, Mattias Sjögren for your help yesterday! )

I am developing a C# wrapper for a 3rd party API. It processes buffers from
a video stream (file) and is structured where the initialization function
passes in two callback methods (my code) that the API calls to successively
read and write buffers. The C++ sample I am modeling this after works and
processes thousands of buffers, but when interface to my C# wrapper the API
gets a stack overflow every time the 18th buffer is read and the SUCCCESS
status is returned from the callback.

Q: Is there somethng in the way I am calling/being called by pinvoke that
is causing this stack overflow? I am attaching two posts
1) Facade class that calls the native methods (TpFacade.cs)
2) Driver class that calls the facade class. (ProcessStream.cs)

The stack overflow occurs when the GetStreamBuf method returns SUCCESS for
the 18th time.

Thanks for any suggestions!

+tom allen
Cupertino, CA.

[Ben Voigt [C++ MVP]]

"Tom Allen" <tc**@pacbell.net.(nospam)wrote in message
news:89**********************************@microsof t.com...

Hi, TIA for any help.
(Thanks, Mattias Sjögren for your help yesterday! )

I am developing a C# wrapper for a 3rd party API. It processes buffers
from
a video stream (file) and is structured where the initialization function
passes in two callback methods (my code) that the API calls to
successively
read and write buffers. The C++ sample I am modeling this after works and
processes thousands of buffers, but when interface to my C# wrapper the
API
gets a stack overflow every time the 18th buffer is read and the SUCCCESS
status is returned from the callback.

Q: Is there somethng in the way I am calling/being called by pinvoke that
is causing this stack overflow? I am attaching two posts
1) Facade class that calls the native methods (TpFacade.cs)
2) Driver class that calls the facade class. (ProcessStream.cs)

The stack overflow occurs when the GetStreamBuf method returns SUCCESS for
the 18th time.

Thanks for any suggestions!

You didn't specify a calling convention for the delegate types as far as I
can see, so you might be trashing your caller's stack (actually trashing his
EBP, ESP registers).

>
+tom allen
Cupertino, CA.

[=?Utf-8?B?VG9tIEFsbGVu?=]

Ben,

Thanks much for the reply, and for taking the time to scan the code. Your
suggestion makes sense.

Sadly, today was my last day on this contract. I have forwarded the
information to my boss and I hope she will be able to test it out and post a
reply to this thread. Thanks again.

+tom allen
Cupertino, CA.
"Ben Voigt [C++ MVP]" wrote:

>
"Tom Allen" <tc**@pacbell.net.(nospam)wrote in message
news:89**********************************@microsof t.com...

Hi, TIA for any help.
(Thanks, Mattias Sjögren for your help yesterday! )

I am developing a C# wrapper for a 3rd party API. It processes buffers
from
a video stream (file) and is structured where the initialization function
passes in two callback methods (my code) that the API calls to
successively
read and write buffers. The C++ sample I am modeling this after works and
processes thousands of buffers, but when interface to my C# wrapper the
API
gets a stack overflow every time the 18th buffer is read and the SUCCCESS
status is returned from the callback.

Q: Is there somethng in the way I am calling/being called by pinvoke that
is causing this stack overflow? I am attaching two posts
1) Facade class that calls the native methods (TpFacade.cs)
2) Driver class that calls the facade class. (ProcessStream.cs)

The stack overflow occurs when the GetStreamBuf method returns SUCCESS for
the 18th time.

Thanks for any suggestions!

You didn't specify a calling convention for the delegate types as far as I
can see, so you might be trashing your caller's stack (actually trashing his
EBP, ESP registers).

+tom allen
Cupertino, CA.