CCyUSBDevice destructor hangs in Windows 7?

[brba_4625011]

Using CyAPI in a C++ DLL project, I create a CCyUSBDevice object dedicated to responding to PnP events with the following code:

cCyUSBDevice = new CCyUSBDevice(hWnd, CYUSBDRV_GUID, FALSE);

Above, "hWnd" is a handle to a "message only" window that can receive the PnP messages.

All is well.

At shutdown, or whenever the DLL is unloaded, I call the CCyUSBDevice destructor with the following code:

delete cCyUSBDevice;

Under Windows 10, the destructor executes without problems.  However, under Windows 7, the destructor never returns!!!

This problem under Windows 7 seems to have something to do with "hWnd"...if I provide a bogus value to "hWnd" during construction, the destructor doesn't hang (but, of course, the PnP message handling won't work).

Does anyone know of something I need to do prior to the executing the destructor, in this case where "hWnd" is a legitimate window, so that the destructor executes to completion under Windows 7?

Thanks to anyone for any insight.

-Bruce

[YatheeshD_36]

Hello,

Please try closing the handle using the Close() function before the destructor.

Refer to the snippet below:

USBDevice->Close();

delete USBDevice; 

USBDevice = NULL;

Let me know if this works.

Thanks,

Yatheesh

[brba_4625011]

Hi Yatheesh, and thank you very much for responding!

Your suggestion, explicitly calling the CCyUSBDevice::Close() function

prior to the deletion, was a good one, but, alas, it didn't solve the

problem.

I also tried destroying the message-only window, via the DestroyWindow()

function, prior to the deletion, and that also did not solve the problem.

I so wish I could debug into CCyUSBDevice::~CCyUSBDevice() to see what the

holdup is!

Thanks again,

Bruce

Bruce Ball

Software Engineer

3980 Ranchero Drive

Ann Arbor, MI 48108

Office: (734) 922-4065

Cell: (734) 355-3144

bruceb@coherix.com <xxxxx@coherix.com>

...........................................

On Fri, Jan 17, 2020 at 1:01 AM YatheeshK_36 <community-manager@cypress.com>

[YatheeshD_36 · Accepted solution]

Hello,

You can refer to the C++ bulkloop and streamer application in the FX3 SDK.

The applications sources are present in the path  C:\Program Files (x86)\Cypress\EZ-USB FX3 SDK\1.3\application\cpp.

Best Regards,

Yatheesh

[brba_4625011]

Thank you again for your help. I did look at the source code for and build

the two projects that you pointed out. Unfortunately, I didn't find

anything to help my situation.

Bruce Ball

Software Engineer

3980 Ranchero Drive

Ann Arbor, MI 48108

Office: (734) 922-4065

Cell: (734) 355-3144

bruceb@coherix.com <xxxxx@coherix.com>

...........................................

On Tue, Jan 21, 2020 at 9:37 AM YatheeshK_36 <community-manager@cypress.com>

[YatheeshD_36]

Hello,

You can use the example windows application and modify it to suite your application. Hope this will be of some help.

Thanks,

Yatheesh