WM_INPUT Failing to Detect Arrow Keys

Hi guys,

I'm not getting the response I expect from WM_INPUT detecting the arrow keys:

Code:

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#define key_right 0x27

USHORT key=raw->data.keyboard.VKey;
 
if(key == key_right){
 if(raw->data.keyboard.Flags == 0)
  face_right=1;  // breakpoint one : never triggers (on keydown or keyup)
else
  face_right=0; // breakpoint two : always triggers on keydown but should only trigger on keyup
}

---

I hope you can help. Thank you.

and raw is defined as what and is given a value from where? It would be more helpful if you posted a complete short program that demonstrated the issue.

What is the value of data.keyboard.Flags?

Quote:

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Originally Posted by endemoniada

Hi guys,

I'm not getting the response I expect from WM_INPUT detecting the arrow keys:

---

Did you try to handle WM_KEYDOWN instead?
Besides, from MSDN

Quote:

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Flags
Type: USHORT
Flags for scan code information. It can be one or more of the following.
Value ...............................Meaning
RI_KEY_BREAK (1)............The key is up.
RI_KEY_E0 (2)..................This is the left version of the key.
RI_KEY_E1 (4)..................This is the right version of the key.
RI_KEY_MAKE (0).............The key is down.

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Thanks for trying to help, here is a mini-program:

Code:

---

void OnInput(LPARAM lParam)
{
 UINT dwSize;

 GetRawInputData((HRAWINPUT)lParam,RID_INPUT,NULL,&dwSize,sizeof(RAWINPUTHEADER));

 LPBYTE lpb=new BYTE[dwSize];

 if(lpb == NULL)
  return;

 if(GetRawInputData((HRAWINPUT)lParam,RID_INPUT,lpb,&dwSize,sizeof(RAWINPUTHEADER)) != dwSize){
  delete [] lpb;
  return;
 }

 RAWINPUT* raw=(RAWINPUT*)lpb;

 if(raw->header.dwType == RIM_TYPEKEYBOARD){

  USHORT key=raw->data.keyboard.VKey;

  if(key == key_right){
  if(raw->data.keyboard.Flags == RI_KEY_MAKE)
    face_right=1;
  else if(raw->data.keyboard.Flags == RI_KEY_BREAK)
    face_right=0;
  }

 }

}

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I am getting raw->data.keyboard.Flags=2 for the arrow keys.

It's for a game and I was hoping to keep all input (keyboard, mouse, gamepad) in a centralized location, that's why I'm not using WM_KEYDOWN.

Thanks again.

Quote:

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Originally Posted by endemoniada

I am getting raw->data.keyboard.Flags=2 for the arrow keys.

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In that case you seem to get the combination (RI_KEY_MAKE | RI_KEY_E0 ) i.e.
(The key is down) | (This is the left version of the key)

The problem is that RI_KEY_MAKE is defined to be 0 so could be taken to be this whatever the value of Flags. One way to test for up/down is

Code:

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Face_right = !(raw->data.keyboard.Flags & RI_KEY_BREAK == RI_KEY_BREAK);

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It's working like a charm now. You guys are so smart, thanks a lot.

Quote:

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Originally Posted by 2kaud

The problem is that RI_KEY_MAKE is defined to be 0 so could be taken to be this whatever the value of Flags.

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I don't see any problem here. Logically there can be only two possibilities for any key: either up or down.
O if it is not the up then it is down.