C / C++ / MFC

30-Nov-06 18:26

I would like to how to get the HWND of mfc DialogBox for .Net?
Please help!

prasad_som30-Nov-06 19:14

30-Nov-06 19:14

Can you explain it in detail ?

Prasad
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LaHaHa30-Nov-06 19:22

30-Nov-06 19:22

I would like to use SetCooperativeLevel function in my mfc dialogbox program. It needs the HWND parameter. How can I get this HWND?
Please help!

prasad_som30-Nov-06 19:29

30-Nov-06 19:29

Doesn't m_hWnd member of CDialog(CWnd to be precise) serve your purpose ?

Prasad
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LaHaHa30-Nov-06 19:40

30-Nov-06 19:40

Before I use it in Visual Studio 6.0 seems to be alright.
But in VS .Net, it seems to be not.
Please help!

prasad_som30-Nov-06 19:44

30-Nov-06 19:44

Again, you are not giving complete information.
- Give code, which is failing for you.
- What error its giving ?
It doesn't help you, if not able to make us understand your problem.

Prasad
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LaHaHa30-Nov-06 19:49

30-Nov-06 19:49

Coding:
if( FAILED( hr = g_pJoystick->SetCooperativeLevel(m_hWnd, DISCL_NONEXCLUSIVE |DISCL_BACKGROUND ) ) )
return hr;

error C2065: 'm_hWnd' : undeclared identifier

Please help!

prasad_som30-Nov-06 20:00

30-Nov-06 20:00

Can you show you dialog class declaration ?
Because, if its Cdialog derived class, then this error should not come.

Prasad
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LaHaHa30-Nov-06 20:11

30-Nov-06 20:11

It is CDialog derived class!
I use m_hwnd before in VS 6.0.
Please help!

prasad_som30-Nov-06 20:29

30-Nov-06 20:29

Oh dear.
I'm really not able to understand, why you are getting this problem.

Now, pass first parameter this instead of m_hWnd. To avoid compile error.

Prasad
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LaHaHa30-Nov-06 20:59

30-Nov-06 20:59

I change the m_hWnd with this.
if( FAILED( hr = g_pJoystick->SetCooperativeLevel(this, DISCL_NONEXCLUSIVE |
DISCL_BACKGROUND ) ) )
return

error C2673: 'InitDirectInput' : global functions do not have 'this' pointers

I got this error!
Please help!

prasad_som30-Nov-06 21:27

30-Nov-06 21:27

Dear,dear.

LaHaHa wrote:
error C2673: 'InitDirectInput' : global functions do not have 'this' pointers

I was insisting on complete information from start of thread.
Again , this error indicates that, code you have pasted is of a global function. And obviously you could not use this pointer there.
I was assuming this code is used in one of your dialog function.
For using it through global function, you need to have instance of dialog class.
Which you can pass as first parameter of said function.

Otherwise, post code of function body of InitDirectInput.

Prasad
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LaHaHa30-Nov-06 22:04

30-Nov-06 22:04

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!

prasad_som30-Nov-06 22:21

30-Nov-06 22:21

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 ) ) )

Prasad
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LaHaHa30-Nov-06 22:30

30-Nov-06 22:30

I got this one now!
error C2664: 'IDirectInputDevice8A::SetCooperativeLevel' : cannot convert parameter 1 from 'CWnd *' to 'HWND'
Please help!

prasad_som1-Dec-06 1:13

1-Dec-06 1:13

You can get its handle by type-casting it.
like

SetCooperativeLevel((HWND)(AfxGetMainWnd()),..);

Prasad
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LaHaHa1-Dec-06 3:50

1-Dec-06 3:50

I will try this, I will tell you the result later!
Many thanks!

Mark Salsbery1-Dec-06 7:28

1-Dec-06 7:28

Try

SetCooperativeLevel((HWND)*AfxGetMainWnd(),..);

Mark Salsbery1-Dec-06 7:26

1-Dec-06 7:26

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 ) ) )

LaHaHa3-Dec-06 14:55

3-Dec-06 14:55

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!

Mark Salsbery3-Dec-06 16:24

3-Dec-06 16:24

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?

LaHaHa3-Dec-06 16:43

3-Dec-06 16:43

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!

Mark Salsbery3-Dec-06 16:54

3-Dec-06 16:54

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

LaHaHa3-Dec-06 18:51

3-Dec-06 18:51

hr got E_HANDLE again!
Please help!

Mark Salsbery3-Dec-06 19:00