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In fact that the function code is only like this:
HRESULT InitDirectInput()
{
HRESULT hr;
if( FAILED( hr = DirectInput8Create( GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (VOID**)&g_pDI, NULL ) ) )
return hr;
if( FAILED( hr = g_pDI->EnumDevices( DI8DEVCLASS_GAMECTRL,
EnumJoysticksCallback,
NULL, DIEDFL_ATTACHEDONLY ) ) )
return hr;
if( NULL == g_pJoystick )
{
MessageBox( NULL, TEXT("Joystick not found. The sample will now exit."), TEXT("DirectInput Sample"), MB_ICONERROR | MB_OK );
return 0;
return S_OK;
}
if( FAILED( hr = g_pJoystick->SetDataFormat( &c_dfDIJoystick2 ) ) )
return hr;
if( FAILED( hr = g_pJoystick->SetCooperativeLevel(this, DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
return hr;
So how to solve this problem!
Please help!
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Come on !
Where is dialog class instance ?
If dialog is already invoked then use AfxGetMainWnd, to get its handle.
LaHaHa wrote: if( FAILED( hr = g_pJoystick->SetCooperativeLevel(this, DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
return hr;
g_pJoystick->SetCooperativeLevel(AfxGetMainWnd(), DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
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I got this one now!
error C2664: 'IDirectInputDevice8A::SetCooperativeLevel' : cannot convert parameter 1 from 'CWnd *' to 'HWND'
Please help!
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You can get its handle by type-casting it.
like
SetCooperativeLevel((HWND)(AfxGetMainWnd()),..);
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I will try this, I will tell you the result later!
Many thanks!
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Try
SetCooperativeLevel((HWND)*AfxGetMainWnd(),..);
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You need to force it to use the overloaded (HWND) casting operator...
For the main window's HWND:
g_pJoystick->SetCooperativeLevel(*AfxGetMainWnd(), DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
For the window's HWND (if this is called within a CWnd-derived class):
g_pJoystick->SetCooperativeLevel(*this, DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
Note the asterisks dereferencing the CWnd pointers.
You can also use this:
g_pJoystick->SetCooperativeLevel(AfxGetMainWnd()->GetSafeHwnd(), DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
or
g_pJoystick->SetCooperativeLevel(GetSafeHwnd(), DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
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I have tried all, the result are
*this and GetSafeHwnd() will get error
*AfxGetMainWnd()
AfxGetMainWnd()->GetSafeHwnd()
both without error, but it will get a E_HANDLE after running the SetCooperativeLevel(...).
Please help!
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I looked back through all your posts and I didn't see where you are making the call from.
Can you post the entire function that includes the call to SetCooperativeLevel()?
LaHaHa wrote: I have tried all, the result are
*this and GetSafeHwnd() will get error
Are you getting compiler error or runtime error?
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HRESULT InitDirectInput();
Void CT1Dlg::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
switch (nIDEvent)
{
case 5: KillTimer(5);
if(!FAILED(InitDirectInput()))
{
.
.
.
HRESULT InitDirectInput()
{
HRESULT hr;
if( FAILED( hr = DirectInput8Create( GetModuleHandle(NULL), DIRECTINPUT_VERSION, IID_IDirectInput8, (VOID**)&g_pDI, NULL ) ) )
return hr;
if( FAILED( hr = g_pDI->EnumDevices( DI8DEVCLASS_GAMECTRL,
EnumJoysticksCallback,
NULL, DIEDFL_ATTACHEDONLY ) ) )
return hr;
if( NULL == g_pJoystick )
{
// MessageBox( NULL, TEXT("Joystick not found. The sample will now exit."),
// TEXT("DirectInput Sample"),
// MB_ICONERROR | MB_OK );
return 0;
}
if( FAILED( hr = g_pJoystick->SetDataFormat( &c_dfDIJoystick2 ) ) )
return hr;
HWND hDlg=AfxGetMainWnd()->GetSafeHwnd();
if( FAILED( hr = g_pJoystick->SetCooperativeLevel(hDlg, DISCL_NONEXCLUSIVE | DISCL_BACKGROUND ) ) )
return hr;
if( FAILED( hr = g_pJoystick->EnumObjects( EnumObjectsCallback,
(VOID*)hDlg, DIDFT_ALL ) ) )
return hr;
return S_OK;
}
I just call it by OnTimer() function.
Please help!
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Thanks that helps!
I would pass the HWND into your InitDirectInput() function.
Void CT1Dlg::OnTimer(UINT nIDEvent)
{
...
if(!FAILED(InitDirectInput(*this)))
{
...
}
...
}
HRESULT InitDirectInput(HWND hwndMain)
{
...
if( FAILED( hr = g_pJoystick->SetCooperativeLevel(hwndMain, DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
return hr;
...
}
If your dialog window is wrapped in (a client of) a frame window then you'd need to pass that
framewnd's handle.
I'm not sure what you're doing overall, but are you sure you want to initialize in response to a
timer event? Generally DirectX initializations are done once, you use the functionality, and
cleanup when you're done.
Mark
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hr got E_HANDLE again!
Please help!
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If you put a breakpoint at the SetCooperativeLevel() call, what's the value of the window handle?
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Also, what are the properties of your dialog resource?
Try setting the dialog's "Overlapped Window" property to true.
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The setting the dialog's "Overlapped Window" property is changed to true,
but the result is the same.
g_pJoystick = 0x001672d4
hwndMain = 0x0007059c {unused=???}
hr = E_HANDLE
Please help!
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Hmm something else is going wrong. The dialog doesn't have the WS_CHILD style does it?
Maybe a dialog is unacceptable as a "top-level window"?
Just for the heck of it, maybe try calling your InitDirectInput() from your dialog's WM_INITDIALOG
handler.
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I have created the project again. Now it will not get the E_HANDLE.
The InitDirectInput(*this) coding is called from OnTimer as before.
It can detect the joystick, but it cannot get any data from the joystick.
The coding are
if(!FAILED(InitDirectInput(*this)))
{
if( NULL != g_pJoystick )
{
HRESULT hr;
TCHAR strText[512] = {0}; // Device state text
DIJOYSTATE2 js; // DInput joystick state
// Poll the device to read the current state
hr = g_pJoystick->Poll();
if(FAILED(hr) )
{
hr = g_pJoystick->Acquire();
while( hr == DIERR_INPUTLOST )
hr = g_pJoystick->Acquire();
}
if( !FAILED( hr = g_pJoystick->GetDeviceState( sizeof(DIJOYSTATE2), &js ) ) )
{
for( int i = 0; i < 128; i++ )
{
if ( js.rgbButtons[i] & 0x80 )
{
TCHAR sz[128];
StringCchPrintf( sz, 128, TEXT("%02d "), i );
StringCchCat( strText, 512, sz );
}
}
}
Please help!
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I don't see anything except GetDeviceState() can return DIERR_INPUTLOST but Acquire() doesn't.
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I found that the first Poll() get "Invalid". After the Acquire(), the hr is S_OK. Then if I Poll() it again, it will get a S_False. Why?
Please help!
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LaHaHa wrote: I found that the first Poll() get "Invalid". After the Acquire(), the hr is S_OK. Then if I Poll() it again, it will get a S_False. Why?
Poll returns what? DI_OK, DI_NOEFFECT or error DIERR_INPUTLOST, DIERR_NOTACQUIRED, or
DIERR_NOTINITIALIZED?
You only need to acquire the device once right?
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After I put the InitDirectInput(*this) in the OnInitDialog(), it is alright.
But my program need to check the joystick to be available periodically.
So how can I do it?
Please help!
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check if it's available periodically or check for input?
Are you going to poll or use events and separate thread(s)?
p.s. sorry I'm replying to different messages - The site is not letting me reply sometimes 
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If the joystick is plugged at the beginning, it is alright. If not, the program cannot detect it.
I would like to make some response for the joystick button.
Could you give me more suggestion?
(Sorry for making trouble to you!;P Thank you for your help! )
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LaHaHa wrote: I would like to make some response for the joystick button.
Could you give me more suggestion?
In the DirextX SDK see the following sections under DirectInput/Programming Guide/DirectInput Device Data:
Polling and Event Notification
Joystick Data
It's explained there better than I ever could 
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I think my problem is the initialization.
My program need to periodically do the initialization of joystick. Could you give me more suggestions?
Please help!
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