some questions about the example code "fasmcam.zip"

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towry

Joined: 15 Aug 2012
Posts: 2

towry

Code:

 WM_CAP_SET_PREVIEWRATE       =  WM_USER + 52
  WM_CAP_SET_SCALE             =  WM_USER + 53
  ID_START                     =  201
  ID_STOP                      =  202
  ID_CLICK                     =  203
  _camtitle                    db 'FASMWEBCAM'
;........
;somthing
;........
 cmp     [wparam], BN_CLICKED shl 16 + ID_START  ; I don't understand what's this mean !!!!
      je      .startbutton

I have searched this question on google, but got nothing.
is BN_CLICKED a constant? what's the value?
btw,my english is not good.. Embarassed

15 Aug 2012, 15:18

bzdashek

Joined: 15 Feb 2012
Posts: 147
Location: Tolstokvashino, Russia

bzdashek

It's macro-constant,
see file:
FASM\INCLUDE\EQUATES\USER32.INC

Code:

BN_CLICKED    = 0

15 Aug 2012, 15:30

towry

Joined: 15 Aug 2012
Posts: 2

towry

I have understood.

wParam: The LOWORD contains the button's control identifier. The HIWORD specifies the notification code.

so,BN_CLICKED shl 16 is notification code.
ID_START is the button's control identifier.
Thanks very much!

15 Aug 2012, 16:28

bzdashek

Joined: 15 Feb 2012
Posts: 147
Location: Tolstokvashino, Russia

bzdashek

You're welcome!

17 Aug 2012, 21:30

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