Thread: (Ken Fitlike) buttons

First you shouldnt use magic number!!!!!!!! That means dont use case 273: , use cas WM_COMMAND: b/c if you dont your not going to get people to help you because we dont have time to decrypt your program for you. Next when your trying to find out what "button" caused the message to be triggered you do LOWORD(wParam) and this is the HANDLE to the "button", then you do HIWORD(wParam) to find out what "button" message it was such as BN_DBLCLCK, BN_CLICKED and so forth.

Originally posted by xds4lx
First you shouldnt use magic number!!!!!!!!

Sorry. I didn't know what the constant for that message was. I found out if was 273, by doing this:

Code:

//inside my message handler
char buff[20];
_itoa(umsg,buff,10);
MessageBox(NULL,buff,"Message Numbers:",NULL);

Which of course meant I went through a ton of messages before I could even see the window on the screen! Sorry for my ignorance, I'm still new to Windows programming with C++.
Thanks for the quick answer.

Originally posted by xds4lx
Next when your trying to find out what "button" caused the message to be triggered you do LOWORD(wParam)

Actually the LOWORD(wParam) doesnt give you the handle...it gives you a control specific identifier.......lParam gives you the hwnd

Code:

#include <windows.h>

#define ID_BUT1 40000
#define ID_BUT2 40001

LRESULT CALLBACK WindowFunc(HWND, UINT, WPARAM, LPARAM);

char szWinName[] = "MyWin"; 
HINSTANCE hInstMain;

int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst, 
                   LPSTR lpszArgs, int nWinMode)
{
  HWND hwnd;
  MSG msg;
  WNDCLASSEX wcl;

  hInstMain = hThisInst;
 
  wcl.cbSize = sizeof(WNDCLASSEX); 
  wcl.hInstance = hThisInst; 
  wcl.lpszClassName = szWinName;
  wcl.lpfnWndProc = WindowFunc; 
  wcl.style = 0; 
  wcl.hIcon = LoadIcon(NULL, IDI_APPLICATION);
  wcl.hIconSm = LoadIcon(NULL, IDI_WINLOGO); 
  wcl.hCursor = LoadCursor(NULL, IDC_ARROW);
  wcl.lpszMenuName = NULL; 
  wcl.cbClsExtra = 0;
  wcl.cbWndExtra = 0; 
  wcl.hbrBackground = (HBRUSH) GetStockObject(COLOR_3DFACE +1); 

 
  if(!RegisterClassEx(&wcl)) return 0;

 
  hwnd = CreateWindow(szWinName,"Buttons",WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT, 
    HWND_DESKTOP,NULL, hThisInst,NULL);


  ShowWindow(hwnd, nWinMode);
  UpdateWindow(hwnd);

 
  while(GetMessage(&msg, NULL, 0, 0))
  {
    TranslateMessage(&msg);
    DispatchMessage(&msg); 
  }
  return msg.wParam;
}


LRESULT CALLBACK WindowFunc(HWND hwnd, UINT message,
                            WPARAM wParam, LPARAM lParam)
{
	static HWND hBut1,hBut2;
  switch(message) {
	case WM_CREATE:
hBut1 = CreateWindowEx(0,"Button","Button1",
   WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON,
   245,5,60,30,hwnd,(HMENU)ID_BUT1,hInstMain,NULL);
hBut2 = CreateWindowEx(0,"Button","Button2",
   WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON, 
   245,150,60,30,hwnd,(HMENU)ID_BUT2,hInstMain,NULL);
		break;
	 case WM_COMMAND:
 if(LOWORD(wParam) == ID_BUT1)//test identifier
MessageBox(hwnd,"Button 1","",MB_OK);
if((HWND)lParam == hBut2)//test handle
MessageBox(hwnd,"Button 2","",MB_OK);
		 break;
     case WM_DESTROY:
      PostQuitMessage(0);
      break;
    default:
      
      return DefWindowProc(hwnd, message, wParam, lParam);
  }
  return 0;
}