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After creating the DirectInput system, call the IDirectInput8::EnumDevices method to enumerate the joysticks, as in the following sample code.
//g_pDI is an initialized pointer to IDirectInput8
g_pDI->EnumDevices(DI8DEVCLASS_GAMECTRL, EnumJoysticksCallback,
NULL, DIEDFL_ATTACHEDONLY)
The DI8DEVCLASS_GAMECTRL constant, passed as the first parameter, specifies the class of device to be enumerated.
EnumJoysticksCallback is the address of a callback function to be called each time a joystick is found. This is where the individual devices are created in Step 2: Creating the DirectInput Joystick Device.
The third parameter can be any 32-bit value that you want to make available to the callback function. In this case, nothing is being sent.
The last parameter, DIEDFL_ATTACHEDONLY, is a flag that restricts enumeration to devices that are attached to the computer.
When your application can enumerate the joysticks, go to Step 2: Creating the DirectInput Joystick Device.