WM_CTLCOLORSTATIC lParam, C++ WINAPI

Question

I'm trying to include into my Dialog Window Procedure, that when the msg WM_CTLCOLORSTATIC is received that I get the ID of the Control that is sending the message.

case WM_CTLCOLORSTATIC: 
        UINT ID = GetWindowLong((HWND)lParam, GWL_ID);

Problem is... when I try to type-cast the lParam of WM_CTLCOLORSTATIC it returns the value 65535, which can't be correct; I don't even have a resource item with the maximum UINT ID 65535.

Can you give me any insight into why this is happening?

Are you saying that the window handle (the lParam) is 65535? Or that the result of `GetWindowLong` is 65535? Please clarify your question. — arx, Dec 18 '13 at 13:25
`GetWindowLong` is deprecated as it doesn't support x64 platforms, the correct function is [`GetWindowLongPtr`](http://msdn.microsoft.com/en-us/library/windows/desktop/ms633585(v=vs.85).aspx) — Mgetz, Dec 18 '13 at 13:42
I called GetWindowLong with the parameters "lParam" of CTLCOLORSTATIC and the GWL_ message "GWL_ID". So GetWindowLong should return the UINT ID of the Control sending the message CTLCOLORSTATIC. But it doesn't. It returns 65535. — , Dec 19 '13 at 13:22

manuell · Answer 1 · 2013-12-19T13:31:32.383

5

Your question is not very clear, but I guess that you got an ID of 65535, which is -1, which is pretty standard for a static control ID.

If you want to be able to differentiate your static controls, give them different IDs.

If you don't care of the color for other Static Control, just use:

if ( ID ==  IDC_RECT_CC_00 ) {
    [...]
} else {
    // don't bother
}

edited Dec 19 '13 at 13:31

answered Dec 18 '13 at 13:33

manuell

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Correct. Even there is a constant for that: `IDC_STATIC`. – rodrigo Dec 18 '13 at 13:40
They all have different IDs. The ID for this control is #define IDC_RECT_CC_00 1000 – Dec 19 '13 at 13:24
Each Static control sends WM_CTLCOLORSTATIC to it's parent. You have a Static control with ID -1. – manuell Dec 19 '13 at 13:29

WM_CTLCOLORSTATIC lParam, C++ WINAPI

1 Answers1