VI simulate input drivers

[CoF]

I need to use LabVIEW to process data from an input device, but then I need to get the output from LabVIEW into Windows (eg, like x and y mouse coordinates). Does this mean I need LabVIEW to communicate with a "dummy" mouse driver or is there a more convenient solution?

[smercurio_fc]

LabVIEW has built-in functions for getting data from input devices, like mice. However, I don't quite understand what you mean by "need to get the output from LabVIEW into Windows". Can you provide details on what you mean by this?

[CoF]

I need LabVIEW to emulate mouse events in Windows, just as if it were acting as a mouse driver. I don't know at which level it should do this at, can LabVIEW emulate a kernel mode driver? Or would it be better to just send messages to Windows about mouse events?

[smercurio_fc]

You can call the Windows API functions "SendMessage", "PostMessage", or "SendInput" (an older function) to send messages to Windows, such as a mouse move. You should also take a look at this KB article. Also note that the convention call to use should be set to "stdcall (WINAPI)" in the configuration window for the Call Library Function.

[dweng]

I'm interested in doing the same thing. What KB article are you referencing? There is no link. Thanks.

[smercurio_fc]

Sorry. This was the page: http://sine.ni.com/devzone/cda/epd/p/id/2315.

[CoF]

I don't really like the way LabVIEW handles a lot of the structures used by the Windows kernel, so I wrote a wrapper DLL that simplifies the intialization and outputs.
Essentially:

26	WINAPISENDINPUT_API int fnWinAPISendInput(long x, long y, DWORD flags)
27	{
28	UINT cInputs = 1;
29
30	MOUSEINPUT mouseInput =
31	{
32	x,      // LONG dx
33	y,      // LONG dy
34	0,      // DWORD mouseData
35	flags, // DWORD dwFlags
36	0,      // DWORD time
37	0       // ULONG_PTR dwExtraInfo
38	};
39	INPUT input =
40	{
41	INPUT_MOUSE,    // DWORD type
42	mouseInput              // MOUSEINPUT mi
43	};
44	LPINPUT pInputs = &input;
45	return SendInput(cInputs, pInputs, sizeof(input));
46	}