How to Get Windows User Message in LabVIEW

[xyl4804]

Dear All!

I have to build a VI that can receive windows user message(Msg ID:0x46E) to read data from a CAN Board in an interrupt mode.  I have used GetMessage（）and PeekMessage in user32.dll, but either can't get the 0x46E message generated by the CAN Driver that can be received by a Demo applicaton. Moreover, my VI calling GetMessage() can't do anything when it is waiting for the windows message, but, this is not what I want. I just want a VI working like the “Dequeue element.vi”.

I have downloaded a VI llb from website named:Windows Message Queue.llb, but this llb can neither receive a windows user message（ID:0x46E), nor a message from other application window（not a VI）

Any help would be greatly appreciated!

[nathand]

I'm not an expert in Windows messaging, but I believe the Windows Messaging Library will do what you want, you just need to pull it apart a bit.  There should be no problem registering for the user event, and you might be able to register for an event on a non-VI window by specifying the window title; look inside the Get Window Refnum VI.

[xyl4804]

thank you,