RegisterRawInputDevices WM_INPUT ????

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5 total messages Started by Jonathan Dumaresq Fri, 09 Feb 2007 22:42

#2531

Author: Jonathan Dumaresq
Date: Fri, 09 Feb 2007 22:42

51 lines
2059 bytes

hi all ,

I try to find a simple application that register a hid to get his raw data.

I have try this code, but i not receive the wm_input message:

HEADER

class TForm5 : public TForm
{
__published: // IDE-managed Components
 TButton *Button1;
 void __fastcall Button1Click(TObject *Sender);
private: // User declarations
public:  // User declarations
 __fastcall TForm5(TComponent* Owner);
 void WindowProc(TMessage &msg);
 BEGIN_MESSAGE_MAP
  VCL_MESSAGE_HANDLER(WM_INPUT,TMessage,WindowProc);
 END_MESSAGE_MAP(TForm)

};


CPP file

void __fastcall TForm5::Button1Click(TObject *Sender)
{
 RAWINPUTDEVICE Rid;
 Rid.usUsagePage = 0x01;
 Rid.usUsage = 0x04;
 Rid.dwFlags = 0;                 // adds joystick
 Rid.hwndTarget = NULL;

 if (RegisterRawInputDevices(&Rid, 1, sizeof(Rid)) == FALSE)
 {
   //registration failed. Call GetLastError for the cause of the error.
  ShowMessage("error");
 }
}
//---------------------------------------------------------------------------
void TForm5::WindowProc(TMessage &msg)
{
 ShowMessage("WM_INPUT");
}

this is for a joystick device.

regards

Jonathan

Re: RegisterRawInputDevices WM_INPUT ????

#2532

Author: Remy Lebeau (TeamB)
Date: Fri, 09 Feb 2007 23:14

45 lines
1992 bytes

"Jonathan Dumaresq" <jdumaresq@cimeq.qc.ca_nospam> wrote in message
news:45ccf77e$1@newsgroups.borland.com...

>  void WindowProc(TMessage &msg);

TForm inherits a WindowProc property from TControl.  You cannot
declare a method with the same name.  You should override the virtual
WndProc() method instead.

>  RAWINPUTDEVICE Rid;

You should always zero out API structures before using them:

    RAWINPUTDEVICE Rid = {0};

Or

    RAWINPUTDEVICE Rid;
    memset(&Rid, 0, sizeof(Rid));

Or:

    RAWINPUTDEVICE Rid;
    ::ZeroMemory(&Rid, sizeof(Rid));

>  Rid.usUsagePage = 0x01;
>  Rid.usUsage = 0x04;
>  Rid.dwFlags = 0;                 // adds joystick
>  Rid.hwndTarget = NULL;

Why are you not setting the TForm's Handle as the target?  That is
where you are trying to catch the WM_INPUT messages, afterall.

>  if (RegisterRawInputDevices(&Rid, 1, sizeof(Rid)) == FALSE)
>  {
>    //registration failed. Call GetLastError for the cause of the
error.
>   ShowMessage("error");
>  }

You did not say which error is actually being reported.


Gambit

Re: RegisterRawInputDevices WM_INPUT ????

#2542

Author: Jonathan Dumaresq
Date: Mon, 12 Feb 2007 15:18

40 lines
1917 bytes

>
>>  void WindowProc(TMessage &msg);
>
> TForm inherits a WindowProc property from TControl.  You cannot
> declare a method with the same name.  You should override the virtual
> WndProc() method instead.

good. I have found it after posting it.

>
>>  RAWINPUTDEVICE Rid;
>
> You should always zero out API structures before using them:

I have do it also.

>>  Rid.hwndTarget = NULL;

i think this was my error. The first time i try it i put 'this' instead of 
Handle.

>>  if (RegisterRawInputDevices(&Rid, 1, sizeof(Rid)) == FALSE)
>>  {
>>    //registration failed. Call GetLastError for the cause of the
> error.
>>   ShowMessage("error");
>>  }
>
> You did not say which error is actually being reported.

I have not put it because i have no error.

BUT THANKS AGAIN GAMBIT. this is now working. I got my event :)

do i have to put something at the end of the wndproc to redispatch the 
messages ?

regards

Jonathan

Re: RegisterRawInputDevices WM_INPUT ????

#2543

Author: Jonathan Dumaresq
Date: Mon, 12 Feb 2007 15:23

13 lines
1235 bytes

Hi again,

Is it possible to use

BEGIN_MESSAGE_MAP
 MESSAGE_HANDLER(WM_INPUT TMessage, WMInput)
END_MESSAGE_MAP(TComponent)

to get only the WM__INPUT ?

if yes, what i should put for parameter to END_MESSAGE_MAP ?

Jonathan

Re: RegisterRawInputDevices WM_INPUT ????

#2544

Author: Jonathan Dumaresq
Date: Mon, 12 Feb 2007 15:51

14 lines
1348 bytes

> BEGIN_MESSAGE_MAP
> MESSAGE_HANDLER(WM_INPUT TMessage, WMInput)
> END_MESSAGE_MAP(TComponent)
>
> to get only the WM__INPUT ?
>
> if yes, what i should put for parameter to END_MESSAGE_MAP ?
>
> Jonathan


forget it. I try it and it's work. I put TForm as the parametrer.

Jonathan

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