winapi BN_CLICKED how to identify which button was clicked?

9
votes

I'm creating a simple win32 program using c++, although I think i'm only using c in this app. I need to determine which HWND button was pressed on the app. I've searched msdn reference and it only told me HIWORD is the notification code, and LOWORD is the identifier, for the BN_CLICKED message. I've managed to get as far as determining when a button is clicked, but it only applies for all buttons. All my buttons are created in the WM_CREATE message. This is what i managed to whip up so far:

case: WM_CREATE:
    HWND hPlus = CreateWindowEx( 0, L"BUTTON", L"+", WS_CHILD | WS_VISIBLE, 130, 240, 35, 30, hwnd, ( HMENU )IDC_MENU, GetModuleHandle( NULL ), NULL );
    HWND hEquals = CreateWindowEx( 0, L"BUTTON", L"=", WS_CHILD | WS_VISIBLE, 170, 205, 65, 65, hwnd, ( HMENU )IDC_MENU, GetModuleHandle( NULL ), NULL );
break;

case WM_COMMAND:
    switch( HIWORD( wParam ) )
    {
        case BN_CLICKED:
            MessageBox( hwnd, L"OK", "OK", MB_OK );
            break;
    }
    break;

I've tried comparing hEquals to LOWORD( wParam ) but that gave me an error when compiling. I think I also tried comparing it to HIWORD and LOWORD of lParam as well, which also didn't compile. Now I'm clueless for what to do next.

2
winapibuttonclick
Glad to have helped. Why didn't you accepted one of the two answer? – manuell
Hi Vince. I am here again because someone just upvoted my answer. Why don't you accept an answer? Just curious. – manuell
I got extremely busy. I'm very bad with accepting answers haha. I get distracted so easily and can't even remember what project this was for. – Vince
It was in 2013... Happy programming, anyway! – manuell

2 Answers

9
votes

You just need to look at the lParam it's the button handle:

if ((HWND)lParam == hPlus)
{
    // "plus" clicked ... etc.
}

Though in your code, you'll need to keep the HWND's in global variables to do the comparison.

// somewhere global
HWND hPlus = NULL;
HWND hEquals = NULL;

// in your WndProc ...

case: WM_CREATE:
    hPlus = CreateWindowEx( 0, L"BUTTON", L"+", WS_CHILD | WS_VISIBLE, 130, 240, 35, 30, hwnd, ( HMENU )IDC_MENU, GetModuleHandle( NULL ), NULL );
    hEquals = CreateWindowEx( 0, L"BUTTON", L"=", WS_CHILD | WS_VISIBLE, 170, 205, 65, 65, hwnd, ( HMENU )IDC_MENU, GetModuleHandle( NULL ), NULL );
break;

case WM_COMMAND:
    switch( HIWORD( wParam ) )
    {
        case BN_CLICKED:
            // see which button was clicked
            if ((HWND)lParam == hPlus)
            {
                MessageBox( hwnd, L"hPlus was clicked", "OK", MB_OK );
            }
            break;
    }
    break;

You get the idea, I'm sure....

8
votes

Give each button it's own ID, and pass it to CreateWindowEx in the hMenu parameter, which is used for that:

A handle to a menu, or specifies a child-window identifier, depending on the window style.

#define BTN_PLUS  100
#define BTN_EQUAL 101

CreateWindowEx( 0, L"BUTTON", L"+", WS_CHILD | WS_VISIBLE, 130, 240, 35, 30,
                hwnd, ( HMENU )BTN_PLUS, GetModuleHandle( NULL ), NULL );

CreateWindowEx( 0, L"BUTTON", L"=", WS_CHILD | WS_VISIBLE, 170, 205, 65, 65,
               hwnd, ( HMENU )BTN_EQUAL , GetModuleHandle( NULL ), NULL );

Then, in WM_COMMAND, you can test for the ID:

case WM_COMMAND: {
    if ( LOWORD( wParam ) == BTN_PLUS ) {
        [...]
    }
    [...]
    break;
}