What kind of parameters should I set to a message deploy function in WINAPI

Question

I am learning WINAPI. When I want to programming to get message and then to do some specific operation. I got an error from VC6.0.

For example, I want get wm_keydown message.

code like this:

// .h file
int MainDlg_OnKeyDown(HWND hwnd,WPARAM wParam, LPARAM lParam);

|

HANDLE_MSG(hWnd, WM_KEYDOWN, MainDlg_OnKeyDown);

int MainDlg_OnKeyDown(HWND hwnd, int id,  WPARAM wParam, LPARAM lParam)
{
    return 1;
}

error:

error C2660: 'MainDlg_OnKeyDown' : function does not take 5 parameters

there are seems only 4 parameters from HANDLE_MSG Macro. I know that when I use WM_COMMAND I can create a function with 4 parameters.

void MainDlg_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify);

But what about WM_NOTIFY, WM_KEYDOWN or other messages? How should I know that how many parameters and what kind of parameters should I set when I create message deploy function to a message. I did not find my answer on MSDN and google.Does any one know this? What does MFC do?

Answer 1

HANDLE_MSG macro is defined in Windowsx.h header.

Note: To use message cracker for WM_NOTIFY you must use HANDLE_WM_NOTIFY macro defined in commctrl.h header.