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Igrum

DirectInput problem

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I''m having a problem when I try and retrieve input from a gamepad. When I poll the gamepad prior to getting its state, the poll fails. It returns an S_FALSE COM error, and I''m not sure why. If anyone wants to see code, let me know, but does anyone have some general ideas about what might cause that error?

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Here is how I handle gamepad, and it works well (note that I use buffered data):

if(!diJoyDevice)
return;

//Get joystick state and fill buffer
if(FAILED(diJoyDevice->Poll())) {
HRESULT hr = diJoyDevice->Acquire();
while(hr==DIERR_INPUTLOST) hr = diJoyDevice->Acquire();}

int mx = (int)joystickState.lX, my = (int)joystickState.lY;
int btns = joystickState.btns;
DWORD dwElements = IGE_DI_BUFFER_SIZE; // max number of items to be retrieved

DIDEVICEOBJECTDATA od[IGE_DI_BUFFER_SIZE];

// Retreive the mouse input elements (buffered data)
HRESULT hr = diJoyDevice->GetDeviceData(sizeof(DIDEVICEOBJECTDATA), od, &dwElements, 0);

// Save the joystick input elements to our joystick state structure
for(int i=0;i<(int)dwElements;i++)
{
// Do your specific stuffs here ...
}

www.mpw2002.fr.st

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Here''s the code I use to set up the gamepad. I think the poll might be failing because of something I did wrong when I initialize the device.


  
GUID gamepadGUID;

if (FAILED(lpdimain->EnumDevices(DI8DEVTYPE_GAMEPAD,
DInput_Enum_Gamepads,
&gamepadGUID,
DIEDFL_ATTACHEDONLY)))
{
Log_File("Failed to enumerate or create gamepad.");
return(0);
}

if (FAILED(lpdigamepad1->SetCooperativeLevel(window_handle,
DISCL_BACKGROUND | DISCL_NONEXCLUSIVE)))
{
Log_File("Failed to set gamepad''s cooperative level.");
return(0);
}

if (FAILED(lpdigamepad1->SetDataFormat(&c_dfDIJoystick)))
{
Log_File("Failed to set gamepad''s data format.");
return(0);
}

if (FAILED(lpdigamepad1->Acquire()))
{
Log_File("Failed to acquire gamepad.");
return(0);
}

return(1);


And here''s the code for the callback function


  
BOOL CALLBACK DInput_Enum_Gamepads(const DIDEVICEINSTANCE*
pdidInstance, VOID* pContext)
{
HRESULT hr;

// Obtain an interface to the enumerated joystick.

hr = lpdimain->CreateDevice(pdidInstance->guidInstance,
&lpdigamepad1, NULL);
if(FAILED(hr))
return DIENUM_CONTINUE;

Log_File("Gamepad device created.");
return DIENUM_STOP;
}

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