check whether mouse is plug in or not

i want to write one c program that check whether usb mouse is installed or not in pc? can anyone help me how can i start?

If you just want to know whether any mouse is installed (as opposed to specifically a USB mouse) then you can use

Code:

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bool IsMouse()
{
    return GetSystemMetrics(SM_CMOUSEBUTTONS) > 0;
}

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See http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx