FileSelectPopup hang with restrict extension option and the imaqGetFilterNames (.)

Hi, I have a problem with FileSelectPopup suspended.  It happens when I limit the file extension in the pop up, and the user types a name with a different extension (for example, if I limit the file extension to "*.dat" and the user types "data.txt").  This causes the pop to "leader limited extension to...» "I get a wait cursor and I can't click on anything to make the pop-up go away that effectively blocks the application.  This happens on both the deployment of PC and my development workstation.  In the debugger when I hit the stop button indicates that the program is in the function FileSelectPopup (...).  Oddly enough, so far I only see this on PC under Windows 7 (64-bit, professional) while the computers Windows XP (deployment and development) not yet shown that it.

After a while, I managed to follow him to the function imaqGetFilterNames (.).  If I call a (...) FileSelectPopup before calling the function imaqGetFilterNames (.) it behaves properly.  If I called him after that I call the function imaqGetFilterNames (.), then I get the hang.  I have attached a sample application.  To see the problem, click on the button 'Get the names of the filters', then click on the button "Generate FileSelectPopup" and enter a file name with a different extension that allowed such as "data.txt".  If the 'Get the names of the filters' button is not clicked first then the FileSelectPopup behaves normally.

My development PC running CVI 2010 SP1 10.0.1 (419).  I have NEITHER-IMAQ 4.6.1, e/s NOR-IMAQ, NOR-IMAQdx 3.9.1, 2.5 NO Vision 10.0.  Windows 7 Professional 64 bit.

Thanks in advance for any help or pointers.

It is a problem with the apartment thread style. As it is described here on MSDN, using a partition multithreaded model can cause problems with the Windows file dialog boxes. The FileSelectPopup function is essentially a wrapper autour windows file dialog boxes that help you with the different settings. So, if you use a partition multithreaded model, you can run into issues every time with the help of the CVI FileSelectPopup or one of the other windows file dialog boxes. In general, your request will be only to get ready to partition multithreaded if you call ActiveX, because all functions in the ActiveX CVI library initialize thread for partition multithreaded model. I'm not familiar with the vision software, but I suspect they are will make a call ActiveX or in any other way during the initialization of the threading model for bulkhead multithreaded. To avoid this deadlock, you can simply set the threading model for the single apartment of threads before calling the function IMAQ. at the beginning of the hand () is a good place. Once the threading model has been initialized, it is set in stone and cannot be changed. It's a good thing here because it prevents IMAQ function change to partition multithreaded.

The beginning of hand () add the following:

CA_InitActiveXThreadStyleForCurrentThread (0, COINIT_APARTMENTTHREADED);

Tags: NI Software

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